From huitema@windows.microsoft.com Wed Apr 1 00:19:00 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 3AF8B3A68C8 for ; Wed, 1 Apr 2009 00:19:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.374 X-Spam-Level: X-Spam-Status: No, score=-110.374 tagged_above=-999 required=5 tests=[AWL=0.225, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jBUOaKxe3DIP for ; Wed, 1 Apr 2009 00:18:59 -0700 (PDT) Received: from smtp.microsoft.com (maila.microsoft.com [131.107.115.212]) by core3.amsl.com (Postfix) with ESMTP id E589A3A6860 for ; Wed, 1 Apr 2009 00:18:58 -0700 (PDT) Received: from tk5-exhub-c104.redmond.corp.microsoft.com (157.54.88.97) by TK5-EXGWY-E801.partners.extranet.microsoft.com (10.251.56.50) with Microsoft SMTP Server (TLS) id 8.2.99.4; Wed, 1 Apr 2009 00:19:58 -0700 Received: from tk5-exmlt-w601.wingroup.windeploy.ntdev.microsoft.com (157.54.18.32) by tk5-exhub-c104.redmond.corp.microsoft.com (157.54.88.97) with Microsoft SMTP Server id 8.2.99.4; Wed, 1 Apr 2009 00:19:58 -0700 Received: from NA-EXMSG-W601.wingroup.windeploy.ntdev.microsoft.com ([fe80::8de9:51a2:cd62:f122]) by tk5-exmlt-w601.wingroup.windeploy.ntdev.microsoft.com ([157.54.18.32]) with mapi; Wed, 1 Apr 2009 00:22:38 -0700 From: Christian Huitema To: Dan Wing , "behave@ietf.org" Date: Wed, 1 Apr 2009 00:19:55 -0700 Thread-Topic: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC Thread-Index: AcmyIUW2ikbZIw5YTEmzRV4tWpL7fQAVbzawAAg7o9A= Message-ID: <8EFB68EAE061884A8517F2A755E8B60A1CBEEBCA43@NA-EXMSG-W601.wingroup.windeploy.ntdev.microsoft.com> References: <022801c9b277$2f5c99e0$c4f0200a@cisco.com> In-Reply-To: <022801c9b277$2f5c99e0$c4f0200a@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "draft-ietf-behave-nat-behavior-discovery@tools.ietf.org" Subject: Re: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Apr 2009 07:19:00 -0000 I tend to agree with Cullen on some points. Instead of a draft presenting a= set of algorithm, I would rather see a draft presenting a set of tools tha= t can be useful for characterizing local connectivity, and presenting these= tools as justifying a new set of STUN options that applications developers= could then use as they see fit. The draft proposes a set of algorithms to characterize a NAT. As Cullen poi= nts out, any of these algorithms has weaknesses. The main weakness is that = the behavior of NAT is often transient, e.g. different port mapping algorit= hms depending on whether or not the internal tables are near saturation, or= not. So, any attempt to present an algorithm as a definitive classifier is= , by nature, weak. On the other hand, even weak attempts are useful, especi= ally in peer-to-peer applications, but also for network management and debu= gging. There is a tradeoff between resource consumed and precision of the c= haracterization. This tradeoff is largely for the application developers an= d users to decide. The interesting question is, what mechanisms do application developers need= , in addition to the basic response system defined in STUN? Most of these n= ew mechanisms fall direct a server to send packets to a different address, = to a different port, or at a different time, plus indeed a negotiation mech= anism to determine whether such mechanisms are available. I don't see much = harm in defining these mechanisms and the corresponding options. Indeed, I = see some goodness in defining them once, in the IETF. The main goodness comes form a way to control the use of the mechanisms. Se= nding responses to a different address, to a different port, or at a differ= ent time has a risk. Such mechanisms can be used for denial of service atta= cks. If we are convinced that the draft mitigates such denial of service at= tacks, then we should register the corresponding attributes. > -----Original Message----- > From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On Behalf > Of Dan Wing > Sent: Tuesday, March 31, 2009 8:09 PM > To: behave@ietf.org > Cc: draft-ietf-behave-nat-behavior-discovery@tools.ietf.org > Subject: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior- > discovery (NATBehavior Discovery Using STUN) to Experimental RFC > > Forwarded for those that don't follow the main IETF list. > > Please reply to the list if you agree or disagree with the points raised > by > Cullen. Thanks. > > -d > > > -----Original Message----- > From: ietf-bounces@ietf.org [mailto:ietf-bounces@ietf.org] On Behalf Of > Cullen > Jennings > Sent: Tuesday, March 31, 2009 9:53 AM > To: IETF Discussion; IESG IESG > Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior- > discovery > (NATBehavior Discovery Using STUN) to Experimental RFC > > > I was somewhat shocked to see the draft in IETF Last Call. The last > time this draft was discussed at the microphone in Behave, many people > were very concerned that it id not possible to correctly characterize > a NAT without using more than one address behind the NAT. The tests > done on on NATs by the researches at MIT did that, so did the the > stuff from Cornell, as did draft-jennings-behave-test-results. The > reason why this was needed is largely the reason why the IETF invented > ICE. Initially folks thought that STUN alone would be enough to do NAT > traversal. This turned out not to be true, STUN deprecated those parts > and ICE was started. This draft fails to describe the types of test > that have actually been found to work and just reinstates the stuff > that was deployed and failed and then deprecated out of STUN. > > Now this draft pays some lip service to the fact that it basically > won't work. You can read section 1 and get the full idea. The first > and 2'nd par basically say this won't work. Then para 3 proposes this > is experiment to find out something we already know the answer to. > When this work was chartered, it was about making a way to > characterize NATs and describe them in a controlled lab like > environment. It was not about resurrecting exactly the part of STUN > that had been tried, failed , and deprecated. > > Specific problems with the draft.... > > 2.2 - this just won't work. The test described in this draft will not > find out if the node is behind an endpoint independent nat. I have > specific nats where it won't work. I have explained to the authors why > it won't work. The answer I get back is "it might work some of the > time". It true it might work some of the time but we all agree there > are many NATs for which it will not work. > > Other section that don't work are 3.1, 3.2, 3.3, 3.4, 3.5, 3.5 - uh > all of them actually. I'm glad to provide details on why they don't > work but I have in the past and we not really debating if they work or > not. The authors believe there is sufficient text at the beginning of > the draft in section 1 that it is OK that these fail in many cases and > don't need to be mentioned again. We not debating these work some of > the but not all the time - everyone agrees on that. > > Section 4.1 - The results in here will be just wrong for ports > different than the one the test was run on. The response to this was > to add "use same port when possible". That's not going to exactly > cause applications to work. > > Section 4.2 - Can't really separate the topic from if UDP is blocked > from if the STUN server is down. > > Section 4.4 - this fails if the port was recently used for similar > tests from same stun server. There no way to know this as an > application. This type of test can work in lab condition where all > traffic on NAT is controlled but it operational networks it will fail. > > It is possible to do timing testing using just the change ip flag. The > REPSONSE-TARGET stuff is not needed and open up the possibility to > have a STUN server send packets to places that it should not which > causes IDS system to black list all traffic from the STUN server thus > making it unusable for other clients. The ability to tell the STUN > server to send packets to arbitrary locations would be fine for a > system in a lab used to characterize a NAT but is not a good idea for > internet deployed STUN servers. > > The bulk of these issues were sent Aug 28 to behave list during the > 2nd WGLC. I requested agenda time during IETF 74 to discuss these > issues but it was denied. > > In summary -The approaches described in this draft are known to fail > with many NATs. I don't see any evidence of the WG actually having > read this draft much less have consensus on the approach in it. I > think the WG should spend meeting time to discuss the topic and decide > what to do. The key topic in my mind is we are defining a document > that allows us to characterize a NAT in a lab or if we are trying to > make something that works in field and can be used to aid NAT > traversal in applications. > > Cullen > > > > > > On Mar 10, 2009, at 8:44 AM, The IESG wrote: > > > The IESG has received a request from the Behavior Engineering for > > Hindrance Avoidance WG (behave) to consider the following document: > > > > - 'NAT Behavior Discovery Using STUN ' > > as an Experimental > > RFC > > > > The IESG plans to make a decision in the next few weeks, and solicits > > final comments on this action. Please send substantive comments to > > the > > ietf@ietf.org mailing lists by 2009-03-31. Exceptionally, > > comments may be sent to iesg@ietf.org instead. In either case, please > > retain the beginning of the Subject line to allow automated sorting. > > > > The file can be obtained via > > > http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior- > discovery-0 > 6.txt > > > > > > IESG discussion can be tracked via > > > https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&dTag= =3D > 15728& > rfc_flag=3D0 > > > > The following IPR Declarations may be related to this I-D: > > > > https://datatracker.ietf.org/ipr/919/ > > https://datatracker.ietf.org/ipr/945/ > > > > > > _______________________________________________ > > Behave mailing list > > Behave@ietf.org > > https://www.ietf.org/mailman/listinfo/behave > > _______________________________________________ > Ietf mailing list > Ietf@ietf.org > https://www.ietf.org/mailman/listinfo/ietf > > _______________________________________________ > Behave mailing list > Behave@ietf.org > https://www.ietf.org/mailman/listinfo/behave From magnus.westerlund@ericsson.com Wed Apr 1 04:59:05 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 0ED693A6A8D; Wed, 1 Apr 2009 04:59:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.171 X-Spam-Level: X-Spam-Status: No, score=-6.171 tagged_above=-999 required=5 tests=[AWL=0.078, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dw5iSzuBwY2a; Wed, 1 Apr 2009 04:59:03 -0700 (PDT) Received: from mailgw4.ericsson.se (mailgw4.ericsson.se [193.180.251.62]) by core3.amsl.com (Postfix) with ESMTP id 8CDE73A67A7; Wed, 1 Apr 2009 04:59:03 -0700 (PDT) Received: from mailgw4.ericsson.se (unknown [127.0.0.1]) by mailgw4.ericsson.se (Symantec Mail Security) with ESMTP id 8AD02213B7; Wed, 1 Apr 2009 14:00:02 +0200 (CEST) X-AuditID: c1b4fb3e-ac7b6bb000006d6d-74-49d3574274bc Received: from esealmw128.eemea.ericsson.se (unknown [153.88.253.125]) by mailgw4.ericsson.se (Symantec Mail Security) with ESMTP id 6412C2111E; Wed, 1 Apr 2009 14:00:02 +0200 (CEST) Received: from esealmw126.eemea.ericsson.se ([153.88.254.170]) by esealmw128.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Wed, 1 Apr 2009 13:59:53 +0200 Received: from [147.214.183.173] ([147.214.183.173]) by esealmw126.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Wed, 1 Apr 2009 13:59:53 +0200 Message-ID: <49D35739.7040008@ericsson.com> Date: Wed, 01 Apr 2009 13:59:53 +0200 From: Magnus Westerlund User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: Cullen Jennings References: <20090310144414.B66263A6A6D@core3.amsl.com> In-Reply-To: X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-OriginalArrivalTime: 01 Apr 2009 11:59:53.0038 (UTC) FILETIME=[5DE34EE0:01C9B2C1] X-Brightmail-Tracker: AAAAAA== Cc: Behave WG , IESG IESG , ietf Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NAT Behavior Discovery Using STUN) to Experimental RFC X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Apr 2009 11:59:05 -0000 Cullen, I will respond to your comment on a high level. I think the applicability statement on this document is correct and clear that this will not work all the time. You seem to want to press the point that there is no meaning for a mechanism unless it is always correct. I don't agree with that view, and because of that I found is suitable to last call. The uncertainty in its usefulness is why it is labeled experimental. I do like to see input from more individuals before determining consensus if this document should be moving forward or be blocked. I would also like to see the authors comment on the individual points. It seems likely that document changes are needed if we are progressing this to IESG review. Best Regards Magnus Cullen Jennings skrev: > > I was somewhat shocked to see the draft in IETF Last Call. The last time > this draft was discussed at the microphone in Behave, many people were > very concerned that it id not possible to correctly characterize a NAT > without using more than one address behind the NAT. The tests done on on > NATs by the researches at MIT did that, so did the the stuff from > Cornell, as did draft-jennings-behave-test-results. The reason why this > was needed is largely the reason why the IETF invented ICE. Initially > folks thought that STUN alone would be enough to do NAT traversal. This > turned out not to be true, STUN deprecated those parts and ICE was > started. This draft fails to describe the types of test that have > actually been found to work and just reinstates the stuff that was > deployed and failed and then deprecated out of STUN. > > Now this draft pays some lip service to the fact that it basically won't > work. You can read section 1 and get the full idea. The first and 2'nd > par basically say this won't work. Then para 3 proposes this is > experiment to find out something we already know the answer to. When > this work was chartered, it was about making a way to characterize NATs > and describe them in a controlled lab like environment. It was not about > resurrecting exactly the part of STUN that had been tried, failed , and > deprecated. > > Specific problems with the draft.... > > 2.2 - this just won't work. The test described in this draft will not > find out if the node is behind an endpoint independent nat. I have > specific nats where it won't work. I have explained to the authors why > it won't work. The answer I get back is "it might work some of the > time". It true it might work some of the time but we all agree there are > many NATs for which it will not work. > > Other section that don't work are 3.1, 3.2, 3.3, 3.4, 3.5, 3.5 - uh all > of them actually. I'm glad to provide details on why they don't work but > I have in the past and we not really debating if they work or not. The > authors believe there is sufficient text at the beginning of the draft > in section 1 that it is OK that these fail in many cases and don't need > to be mentioned again. We not debating these work some of the but not > all the time - everyone agrees on that. > > Section 4.1 - The results in here will be just wrong for ports different > than the one the test was run on. The response to this was to add "use > same port when possible". That's not going to exactly cause applications > to work. > > Section 4.2 - Can't really separate the topic from if UDP is blocked > from if the STUN server is down. > > Section 4.4 - this fails if the port was recently used for similar tests > from same stun server. There no way to know this as an application. This > type of test can work in lab condition where all traffic on NAT is > controlled but it operational networks it will fail. > > It is possible to do timing testing using just the change ip flag. The > REPSONSE-TARGET stuff is not needed and open up the possibility to have > a STUN server send packets to places that it should not which causes IDS > system to black list all traffic from the STUN server thus making it > unusable for other clients. The ability to tell the STUN server to send > packets to arbitrary locations would be fine for a system in a lab used > to characterize a NAT but is not a good idea for internet deployed STUN > servers. > > The bulk of these issues were sent Aug 28 to behave list during the 2nd > WGLC. I requested agenda time during IETF 74 to discuss these issues but > it was denied. > > In summary -The approaches described in this draft are known to fail > with many NATs. I don't see any evidence of the WG actually having read > this draft much less have consensus on the approach in it. I think the > WG should spend meeting time to discuss the topic and decide what to do. > The key topic in my mind is we are defining a document that allows us to > characterize a NAT in a lab or if we are trying to make something that > works in field and can be used to aid NAT traversal in applications. > > Cullen > > > > > > On Mar 10, 2009, at 8:44 AM, The IESG wrote: > >> The IESG has received a request from the Behavior Engineering for >> Hindrance Avoidance WG (behave) to consider the following document: >> >> - 'NAT Behavior Discovery Using STUN ' >> as an Experimental >> RFC >> >> The IESG plans to make a decision in the next few weeks, and solicits >> final comments on this action. Please send substantive comments to the >> ietf@ietf.org mailing lists by 2009-03-31. Exceptionally, >> comments may be sent to iesg@ietf.org instead. In either case, please >> retain the beginning of the Subject line to allow automated sorting. >> >> The file can be obtained via >> http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-discovery-06.txt >> >> >> >> IESG discussion can be tracked via >> https://datatracker.ietf.org/public/pidtracker.cgi?command=view_id&dTag=15728&rfc_flag=0 >> >> >> The following IPR Declarations may be related to this I-D: >> >> https://datatracker.ietf.org/ipr/919/ >> https://datatracker.ietf.org/ipr/945/ >> >> >> _______________________________________________ >> Behave mailing list >> Behave@ietf.org >> https://www.ietf.org/mailman/listinfo/behave > > -- Magnus Westerlund IETF Transport Area Director & TSVWG Chair ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- From moore@network-heretics.com Wed Apr 1 11:35:11 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 2CF4B3A6BB1 for ; Wed, 1 Apr 2009 11:35:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.909 X-Spam-Level: X-Spam-Status: No, score=-0.909 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, DATE_IN_PAST_96_XX=1.69] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mCXln7kQEVST for ; Wed, 1 Apr 2009 11:35:10 -0700 (PDT) Received: from m1.imap-partners.net (m1.imap-partners.net [64.13.152.131]) by core3.amsl.com (Postfix) with ESMTP id 872F93A6A7B for ; Wed, 1 Apr 2009 11:35:10 -0700 (PDT) Received: from [192.168.1.128] (h66-222-47-6.cncrtn.dedicated.static.tds.net [66.222.47.6]) by m1.imap-partners.net (MOS 3.10.5-GA) with ESMTP id BMH06607 (AUTH via LOGINBEFORESMTP); Wed, 1 Apr 2009 11:35:54 -0700 (PDT) Message-Id: <261EEE7D-55AB-488B-8111-D71E587A9B00@network-heretics.com> From: Keith Moore To: Brian E Carpenter In-Reply-To: <49BF1C5D.6050900@gmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPod Mail 5H11) Date: Fri, 20 Mar 2009 17:16:36 -0400 References: <49B3909F.2050309@it.uc3m.es> <6CF039C5B32037498B02251E11CDE6B007D4EEBF@ftrdmel3> <49B4CC0F.5040304@it.uc3m.es> <07f401c9a0f3$eff5cbd0$c2f0200a@cisco.com> <49B63DA3.4000707@it.uc3m.es> <49BF1C5D.6050900@gmail.com> X-Mailer: iPod Mail (5H11) Cc: "behave@ietf.org" , "mohamed.boucadair@orange-ftgroup.com" , Dan Wing Subject: Re: [BEHAVE] comment about draft-wing-behave-nat64-referrals-00.txt X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Apr 2009 18:35:11 -0000 Sent from my iPod >> >> > > Reading that and some earlier comments in this thread, it seems to me > that we might consider defining a generic 'referral object', > containing > more information than just an address, that could be passed among > application entities. It could contain TLVs that would provide the > semantics of the referred address as well as the raw address bits. > > Does this seem worth exploring? I have From pierre.levis@orange-ftgroup.com Thu Apr 2 07:57:35 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id D4CB43A697B; Thu, 2 Apr 2009 07:57:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.048 X-Spam-Level: X-Spam-Status: No, score=-3.048 tagged_above=-999 required=5 tests=[AWL=0.201, BAYES_00=-2.599, HELO_EQ_FR=0.35, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7tKWuZsqJdrK; Thu, 2 Apr 2009 07:57:35 -0700 (PDT) Received: from p-mail2.rd.francetelecom.com (p-mail2.rd.francetelecom.com [195.101.245.16]) by core3.amsl.com (Postfix) with ESMTP id 6372B3A686A; Thu, 2 Apr 2009 07:57:34 -0700 (PDT) Received: from ftrdmel1.rd.francetelecom.fr ([10.192.128.40]) by ftrdsmtp2.rd.francetelecom.fr with Microsoft SMTPSVC(6.0.3790.3959); Thu, 2 Apr 2009 16:58:36 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Thu, 2 Apr 2009 16:58:33 +0200 Message-ID: In-Reply-To: <986DCE2E44129444B6435ABE8C9E424D02F7E95D@SGSINSMBS02.ad4.ad.alcatel.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [shara] Follow up on Layer2-Aware NAT (draft-miles-behave-l2nat-00) Thread-Index: AcmgdlhcsqF9XOaRSFmUv5LfTG7d5QAAEU/wA2dPQ2AASTlpgAEaJr3w References: <986DCE2E44129444B6435ABE8C9E424D02D5CE0A@SGSINSMBS02.ad4.ad.alcatel.com> <986DCE2E44129444B6435ABE8C9E424D02F7E95D@SGSINSMBS02.ad4.ad.alcatel.com> From: To: , , X-OriginalArrivalTime: 02 Apr 2009 14:58:36.0302 (UTC) FILETIME=[7FDD4AE0:01C9B3A3] Subject: Re: [BEHAVE] [shara] Follow up on Layer2-Aware NAT (draft-miles-behave-l2nat-00) X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Apr 2009 14:57:35 -0000 Hi David, I'm not very convinced on the interest to modelize a PRR as a NAPT = function that would not do any translation. For me it makes the PRR appear as a kind of degenerated NAT, when one of = its main value is to get rid of a CGN function. That said, I agree there is an interest to consider solutions that = integrate both PRR and CGN functions. Pierre -----Message d'origine----- De : MILES DAVID [mailto:David.Miles@alcatel-lucent.com.au]=20 Envoy=E9 : samedi 28 mars 2009 01:27 =C0 : LEVIS Pierre RD-CORE-CAE; behave@ietf.org; shara@ietf.org Objet : RE: [shara] Follow up on Layer2-Aware NAT = (draft-miles-behave-l2nat-00) Pierre, Thanks for the support. The presentation of draft-nishitani-cgn-01 outlined a good way forward - here the Network Model was separated from the core NAT Function. I think a L2-Aware NAT best belongs in a core document like this. In this way L2-Aware NAT could make up an optional component of the core NAT Function (in the way it describes a Virtual NAT [tables] facility). On top of this a variety of network models could be created and documented - these could even come from other working groups (such as Softwires).I believe a core NAT function (regardless of whether we describe IPv4 or IPv6) fits well in BEHAVE.=20 Applying the mechanisms in L2-Aware NAT to PRR makes a lot of sense as well - I'm wondering if port-range solutions could be described (perhaps poorly) as similar to a NAPT mapping function (outside-ip/port to inside-ip/port) however in the case of PRR, the pairs are the same/common - in effect a address/port translation does not occur. What do you think of attempting to describe the PRR function like this? If agreeable I would like to invite the authors of PRR/A+P and CGN drafts to work within the bounds of a new draft that describes a core NAT function (without drawing reference to size or scale) - introducing elements of core NAT function (CGN/LSN) virtual NAPT tables (L2-Aware NAT), and mappings tables where translation is not applied (PRR). Best Regards, -David -----Original Message----- From: shara-bounces@ietf.org [mailto:shara-bounces@ietf.org] On Behalf Of pierre.levis@orange-ftgroup.com Sent: Thursday, March 26, 2009 6:17 AM To: behave@ietf.org; shara@ietf.org Subject: [shara] Follow up on Layer2-Aware NAT (draft-miles-behave-l2nat-00) The comment I had on the mike during behave session 2: This kind of work is very valuable, it is worth not only for CGN but also for Port Ranges solutions and for all IPv4 shortage solutions.=20 As we presented it in the shara BoF all solutions basically: 1) Put a dedicated function in an ISP Box (CGN, PRR, whatever) 2) Use some sort of transport mechanism (tunneling, layer 2, whatever) between customers and ISPBox,=20 3) Are confronted with the same issues: how to force a route from customers to ISPBox, how to route back from ISPBox to relevant customer, how to identify the customer.=20 This would advocate for seeing all work related to IPv4 shared addresses host in the same place, under the same ombrella. =20 Regards Pierre _______________________________________________ shara mailing list shara@ietf.org https://www.ietf.org/mailman/listinfo/shara From philip_matthews@magma.ca Thu Apr 2 17:04:55 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id B5AE93A67B1; Thu, 2 Apr 2009 17:04:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o5zFbjCU+x8X; Thu, 2 Apr 2009 17:04:54 -0700 (PDT) Received: from mail-06.primus.ca (mail11.primus.ca [216.254.141.178]) by core3.amsl.com (Postfix) with ESMTP id 9DFAA3A691B; Thu, 2 Apr 2009 17:04:54 -0700 (PDT) Received: from [24.139.16.154] (helo=[10.0.1.2]) by mail-06.primus.ca with esmtpa (Exim 4.69) (envelope-from ) id 1LpWux-0002sP-26; Thu, 02 Apr 2009 20:05:56 -0400 Message-Id: <6A28220D-19D9-45DC-8A86-071E1C15F900@magma.ca> From: Philip Matthews To: draft-atlas-icmp-unnumbered@tools.ietf.org In-Reply-To: <20090309135003.A529A3A6BC1@core3.amsl.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v929.2) Date: Thu, 2 Apr 2009 20:05:53 -0400 References: <20090309135003.A529A3A6BC1@core3.amsl.com> X-Mailer: Apple Mail (2.929.2) X-Authenticated: philip_matthews@magma.ca - ([10.0.1.2]) [24.139.16.154] Cc: Behave WG , IETF Discussion Subject: Re: [BEHAVE] Last Call: draft-atlas-icmp-unnumbered (Extending ICMP for Interface and Next-hop Identification) to Proposed Standard X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Apr 2009 00:04:55 -0000 [Cross-posting to BEHAVE, since my comments directly concern ongoing work in that WG] I feel that the ICMP extension defined in this draft would give very useful information when debugging network problems. However, I have a few concerns about one aspect of the encoding of the ICMP extension and how this interacts with NATs. I apologize for sending these comments so late in the draft cycle, but it is only recently that I have had cause to look closely at the interaction of this draft with NATs. In section 5, when discussing the addresses contained in the ICMP Interface Information object defined in the draft, the draft says that: a NAT SHOULD translate private realm addresses and SHOULD NOT translate external (public) realm addresses, however a NAT MAY choose to pass the extension unaltered. I have the following concerns with this: 1) To implement the "SHOULD" behavior, a NAT must be upgraded to understand the ICMP Interface Information object defined in the draft. In my opinion, we want NATs to have as little knowledge of packets passing through them as possible. I would prefer to require that any receiving host that understands the ICMP Interface Information object also understand about NATs and can handle receiving addresses in the private realm. I understand that some firewalls may prefer to translate or remove the object, but I feel this should not be the recommended behavior. 2) The BEHAVE WG is currently working on NATs to translate between IPv4 and IPv6 to replace NAT-PT (RFC 2766). As currently defined, there does not seem to be any way that such a NAT could implement the behavior defined in section 5 (specifically the part about not translating external realm addresses), since the encoding of the object assumes that all IP addresses in the packet will have the same family (v4 vs v6). 3) Related to point (2), I feel it is likely that we will have cases in the future where the ingress interface will be IPv4 and the the egress interface will be IPv6 (or vica-versa), and an ICMP message must be generated due to an error. One way this might happen is when the packet is traversing a NAT64. However, as noted above, the encoding in the draft does not allow the ingress and egress interfaces to use different address families. One way to address these concerns would be to modify the draft as follows: a) Change the encoding of the ICMP Interface Information object to make the family of each address explicit and independent of the family of other addresses. b) Change the recommendation in section 5 to say that: a NAT SHOULD NOT remove or translate the information in the ICMP Interface Information object. c) Add a sentence or two to state that: any application that understands the ICMP Interface Information object be prepared to handle the case where the addresses come from different realms and are of different address families. As a side note, if an interface has both an IPv4 and an IPv6 address, consider allowing both to be optionally included in the object. Finally, as a general comment, I feel that any ICMP extension object (of which the IMCP Interface Information object is one example) should be defined so that there is no need to have it recognized and translated by a NAT. Draft-ietf-behave-icmp (now in the RFC editor queue) says that that "NATs are encouraged to support ICMP extension objects" and I now feel that this should be interpreted to mean only that NATs must be aware that the general extension mechanism exists. [As a regular contributor to BEHAVE, I will confess that the implications of all this were not clear to me when draft-ietf-behave- icmp passed through BEHAVE.] - Philip From brian.e.carpenter@gmail.com Thu Apr 2 17:48:12 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 53C183A6977 for ; Thu, 2 Apr 2009 17:48:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.501 X-Spam-Level: X-Spam-Status: No, score=-2.501 tagged_above=-999 required=5 tests=[AWL=0.098, BAYES_00=-2.599] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id e+3uF+LdO+nV for ; Thu, 2 Apr 2009 17:48:11 -0700 (PDT) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.179]) by core3.amsl.com (Postfix) with ESMTP id 833823A6971 for ; Thu, 2 Apr 2009 17:48:11 -0700 (PDT) Received: by wa-out-1112.google.com with SMTP id l35so442708waf.5 for ; Thu, 02 Apr 2009 17:49:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :organization:user-agent:mime-version:to:cc:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=mH1v5lKa7OHaKWfXQWKctMWp9oXS5HmMHzenGRoCySw=; b=ohoSwxkgG4AdFxHKdzanWIO4918C6+dpXfnuWZVNfAo0EBjH2k8klNqN0dWnnkjHRN rTDMyqhNe6RFnhHq+rnWtjEIcczPi8z/NNf3U+0Jzm5FwO9PFC2p/Z1PJLH0KjO/cYgt ci3ksJlLwl2L5H5YEuTHMzfB7dvemwryC20z0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:organization:user-agent:mime-version:to:cc :subject:references:in-reply-to:content-type :content-transfer-encoding; b=gIMDM4x1/xSusX9dkOyq5yaA6KJrWPKQ7v8KmCzj1+kss95hiPHuKr/+apOXl3wnJp AuTyLU8f5o62XvdBs7/ZiOarz2uPdrkfqhUOCUK5AolBYU+clwZrESa6QId8tUYMNYrK ZFsNcuO/L6uzHc+tWwE84dZRUMo/Sb9ybugAY= Received: by 10.114.161.11 with SMTP id j11mr281655wae.105.1238719753371; Thu, 02 Apr 2009 17:49:13 -0700 (PDT) Received: from ?130.216.38.124? (stf-brian.sfac.auckland.ac.nz [130.216.38.124]) by mx.google.com with ESMTPS id m6sm1627929wag.14.2009.04.02.17.49.11 (version=SSLv3 cipher=RC4-MD5); Thu, 02 Apr 2009 17:49:12 -0700 (PDT) Message-ID: <49D55D30.4000407@gmail.com> Date: Fri, 03 Apr 2009 13:49:52 +1300 From: Brian E Carpenter Organization: University of Auckland User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Fred Baker References: <7CCEA676-DC64-4CE6-A3BF-D5F7605C2A5F@magma.ca> <07600313-D7B8-4E82-94D5-9306C9F3033D@cisco.com> <49D022F2.20907@network-heretics.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Behave Chairs , Behave WG , Keith Moore , Philip Matthews Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Apr 2009 00:48:12 -0000 On 2009-03-30 16:17, Fred Baker wrote: > > On Mar 29, 2009, at 6:40 PM, Keith Moore wrote: > >> Personally, the only sense that I think the magic prefix should be a >> "default" is in the sense of "last resort". As in, you SHOULD use an >> LIR prefix, and all of the relevant protocols and software need to >> accommodate the ability to configure that LIR prefix. But if for some >> reason you actually think you want to use a magic prefix, please use >> this one allocated by IANA for that purpose, rather than (say) pulling >> one out of thin air, or using a prefix allocated for a different purpose. > > If the working group would like me to word it that way, I'm OK with that. I think that is a reasonable solution. But I'm pretty sure we need to add an adapted version of the following rules from RFC3056: 6to4 prefixes more specific than 2002::/16 must not be propagated in native IPv6 routing, to prevent pollution of the IPv6 routing table by elements of the IPv4 routing table. Therefore, a 6to4 site which also has a native IPv6 connection MUST NOT advertise its 2002::/48 routing prefix on that connection, and all native IPv6 network operators MUST filter out and discard any 2002:: routing prefix advertisements longer than /16. (Yes, I wrote that text, and I am hereby contributing it under RFC5378...) Brian > > the way the question was worded in the working group was exactly the > opposite, and the options given were > > a) only use an LIR prefix, and > b) request a magic prefix and by default use it > > There was no third option, "request a magic prefix and give guidance on > its use" > _______________________________________________ > Behave mailing list > Behave@ietf.org > https://www.ietf.org/mailman/listinfo/behave > From brian.e.carpenter@gmail.com Thu Apr 2 17:51:37 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 054F63A6B00 for ; Thu, 2 Apr 2009 17:51:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.503 X-Spam-Level: X-Spam-Status: No, score=-2.503 tagged_above=-999 required=5 tests=[AWL=0.096, BAYES_00=-2.599] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1L9FzU1D323w for ; Thu, 2 Apr 2009 17:51:36 -0700 (PDT) Received: from rv-out-0506.google.com (rv-out-0506.google.com [209.85.198.233]) by core3.amsl.com (Postfix) with ESMTP id 15DAC3A69BF for ; Thu, 2 Apr 2009 17:51:36 -0700 (PDT) Received: by rv-out-0506.google.com with SMTP id k40so785626rvb.49 for ; Thu, 02 Apr 2009 17:52:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :organization:user-agent:mime-version:to:cc:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=sMAtkrsC0yaLAJsi/LCZJlba8fTCUMVi2mwOX/79wu0=; b=fscwbmwyw4eGA6QTvUP5/N1yf9P+B5rAcF7eUH0kI5nSBHYkWIm0DCR95a7lJtPXAG xHCWIRCVP82DIihmFi9VJ+NTzmvu8G06UYK8U6r03cHUCPYGmZsrL/fFtv6DXh3LSrIW GD6RyD1eEpKqoieKtucM6WLcjykyaY/6wKoEY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:organization:user-agent:mime-version:to:cc :subject:references:in-reply-to:content-type :content-transfer-encoding; b=GxhWGv2mkftoUjXRioPJDU6TO71983g+A0Itiv+PRJWJTaeWEWFOL7t5pHOM5wos2p p6NOnlpe6mCT69B0Jq0h5zPlaIKIBT6JdFZBj6sgnQX8E2gi7tX2Re0j09y5DmwifWqS w5LUlFiPohklVricspr77qOCu03pMYvrPw4u0= Received: by 10.114.77.1 with SMTP id z1mr269679waa.214.1238719958142; Thu, 02 Apr 2009 17:52:38 -0700 (PDT) Received: from ?130.216.38.124? (stf-brian.sfac.auckland.ac.nz [130.216.38.124]) by mx.google.com with ESMTPS id l38sm1683664waf.33.2009.04.02.17.52.36 (version=SSLv3 cipher=RC4-MD5); Thu, 02 Apr 2009 17:52:37 -0700 (PDT) Message-ID: <49D55DFD.6070302@gmail.com> Date: Fri, 03 Apr 2009 13:53:17 +1300 From: Brian E Carpenter Organization: University of Auckland User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Xing Li References: <67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org> <49CB85A9.6090903@cernet.edu.cn> <49CB9763.4060705@it.uc3m.es> <49CCDD7D.3000704@cernet.edu.cn> <49CCE6F4.5020903@gmail.com> <49CE2E9D.3040004@cernet.edu.cn> In-Reply-To: <49CE2E9D.3040004@cernet.edu.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: Hiroshi MIYATA , Behave WG , Fred Baker , Behave Chairs Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Apr 2009 00:51:37 -0000 Xing Li, I think we agree. Regards Brian Carpenter University of Auckland On 2009-03-29 03:05, Xing Li wrote: > Brian E Carpenter =E5=86=99=E9=81=93: >> >> Agreed that it would be a very bad idea. But I don't understand >> why it would happen. It doesn't happen with 2002::/8. >> Actually the analysis in RFC3056 states that this WKP can only be used= >> safely if the IPv4 network is not fragmented, i.e. you MUST NOT >> use 6to4 after the IPv4 global routing breaks up (in 500 years >> from now?). There would need to be a similar rule for a NAT64 WKP, >> I think. >> =20 >> And the same practice would need to be used for the WKP: more specific= s >> not allowed. BTW that might recreate some of the black hole issues >> we see for 6to4. So maybe a WKP is not such a good idea. >> >> Brian >> >> >> =20 > I see the point now. But in the stateless mode, the effect to the globa= l > IPv6 Internet makes the difference. >=20 > For the IPv6 Internet to an IPv4-network scenario, the WKP doesn't > work if the IPv4 is using private IPv4 addresses. With public IPv4 > addresses, each IPv4 site will inject a route in the IPv6 routing > table, i.e. importing IPv4 routing table entropy into IPv6 routing > table. Therefore, the LIR should be selected. >=20 > For "an IPv4 network to IPv4 Internet" scenario, as shown in the > following Figure, the stateless and stateful mode should be discussed= > separately" >=20 > ------ ----- ------ > / The \ ----- / An \ / The \ > | IPv4 |-----|Xlate|------| IPv6 |-----| IPv6 | > \Internet/ ----- \Network/ \Internet/ > ------ ----- ------ > A B >=20 > Figure: An IPv4 network to IPv4 Internet >=20 > 1. If Xlate is stateless, "an IPv6 network" will consist of hosts > using IVI6 addresses (more specifics of the IPv4 embedded IPv6 > addresses). The IVI6 hosts can communicate with both the global IPv4= > Internet and the global IPv6 Internet. The stateless Xlate supports > both IPv6 initiated communication and the IPv4 initiated > communications. >=20 > 1.1 In border A, "an IPv6 network" will advertise IVI6 addresses to > the Xlate and the Xlate will advertise the IPv4 embedded IPv6 > addresses corresponding to 0.0.0.0/0 to "an IPv6 network". >=20 > 1.2 In border B, "an IPv6 network" will advertise IVI6 addresses with= > proper aggregation to the IPv6 Internet and the IPv6 Internet will > advertise the global IPv6 routing table or 2000::/3 to "an IPv6 > network". In other words, "an IPv6 network" should advertise the > aggregated prefix of "an IPv6 network" and should neither advertise > the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 nor IVI6.= > This can be achieved easily if LIR is used, but cannot be achieved if= > WKP is used, since WKP is independent of the aggregated prefix of "an= > IPv6 network". In the case when WKP is used, the IVI6 must be > advertised to the IPv6 Internet in order to communicate with other > IPv6 hosts in the IPv6 Internet and this advertisement will > eventually result in the injecting of the global IPv4 routing table > into the global IPv6 routing system. >=20 > 2. If Xlate is stateful, "an IPv6 network" will consist of ordinary > IPv6 addresses and Xlate maintains session-initiated states to map > between ordinary IPv6 addresses and the IPv4 addresses in the IPv4 > address pool. The stateful Xlate only supports IPv6 initiated > communication. >=20 > 2.1 In border A, "an IPv6 network" will advertise the aggregated > prefix of "an IPv6 network" to the Xlate and the Xlate will advertise= > the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 to "an > IPv6 network". >=20 > 2.2 In border B, "an IPv6 network" will advertise the aggregated > prefix of "an IPv6 network" to the IPv6 Internet and the IPv6 > Internet will advertise the global IPv6 routing table or 2000::/3 to > "an IPv6 network". There is no need to advertise the IPv4 embedded > IPv6 addresses corresponding to 0.0.0.0/0 to the IPv6 Internet, if > translation service of "an IPv6 Internet" is not supported to other > IPv6 networks. Therefore, the selection of WKP versus LIR is mainly > the operational consideration. >=20 > Please comment. >=20 > xing >=20 >=20 >=20 From pierre.levis@orange-ftgroup.com Thu Apr 2 23:49:38 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 0901F3A691B for ; Thu, 2 Apr 2009 23:49:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.066 X-Spam-Level: X-Spam-Status: No, score=-3.066 tagged_above=-999 required=5 tests=[AWL=0.183, BAYES_00=-2.599, HELO_EQ_FR=0.35, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Oay-w1fptpQ3 for ; Thu, 2 Apr 2009 23:49:37 -0700 (PDT) Received: from p-mail1.rd.francetelecom.com (p-mail1.rd.francetelecom.com [195.101.245.15]) by core3.amsl.com (Postfix) with ESMTP id B63893A68D9 for ; Thu, 2 Apr 2009 23:49:36 -0700 (PDT) Received: from ftrdmel1.rd.francetelecom.fr ([10.192.128.40]) by ftrdsmtp2.rd.francetelecom.fr with Microsoft SMTPSVC(6.0.3790.3959); Fri, 3 Apr 2009 08:50:02 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Fri, 3 Apr 2009 08:50:01 +0200 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Question on embedded address format in draft-baker-behave-v4v6-framework-02 Thread-Index: Acm0KGk4CyGDF28rTXKAsb0x6u29Ug== From: To: X-OriginalArrivalTime: 03 Apr 2009 06:50:02.0604 (UTC) FILETIME=[69F3B2C0:01C9B428] Subject: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02 X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Apr 2009 06:49:38 -0000 Hi, -------------------- Quoted from draft-baker-behave-v4v6-framework-02: bits n..n+31 An embedded IPv4 address. Except in the case of a 96 bit prefix, this address intentionally straddles the boundary between [RFC4291]'s 64 bit "subnet" locator and its 64 bit host identifier. The intention is that the /64 be used in routing and the bits in the host part be used for host identification as described in the address architecture. ---------------- RFC4291 says: For all unicast addresses, except those that start with the binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format. ------------- This is taken into account, for instance, in Teredo addresses, quoted from RFC4380: The IPv6 addressing rules specify that "for all unicast addresses, except those that start with binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format". This dictates the encoding of the flags, 16 intermediate bits that should correspond to valid values of the most significant 16 bits of a Modified EUI-64 ID: 0 0 0 1 |0 7 8 5 +----+----+----+----+ |Czzz|zzUG|zzzz|zzzz| +----+----+----+----+ In this format: - The bits "UG" should be set to the value "00", indicating a non- global unicast identifier; - The bit "C" (cone) should be set to 1 if the client believes it is behind a cone NAT, to 0 otherwise; these values determine different server behavior during the qualification procedure, as specified in Section 5.2.1, as well as different bubble processing by clients and relays. - The bits indicated with "z" must be set to zero and ignored on receipt. Thus, there are two currently specified values of the Flags field: "0x0000" (all null) if the cone bit is set to 0, and "0x8000" if the cone bit is set to 1. (Further versions of this specification may assign new values to the reserved bits.) --------- Question: Do we have to address the conformity to Modified EUI-64 format for v4v6 addresses? In particular the so-called UG bits? In that case, is it still possible to have an IPv4 embedded address that crosses the 64bit boundary? If we do not care, why does Teredo (which includes two IPv4 addresses) care? Regards Pierre From magnus.westerlund@ericsson.com Fri Apr 3 04:40:00 2009 Return-Path: X-Original-To: behave@core3.amsl.com Delivered-To: behave@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id A7F5C3A6BE6 for ; Fri, 3 Apr 2009 04:40:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.173 X-Spam-Level: X-Spam-Status: No, score=-6.173 tagged_above=-999 required=5 tests=[AWL=0.074, BAYES_00=-2.599, HELO_EQ_SE=0.35, HTML_MESSAGE=0.001, MIME_HTML_MOSTLY=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PfaW8yArwSjr for ; Fri, 3 Apr 2009 04:39:58 -0700 (PDT) Received: from mailgw3.ericsson.se (mailgw3.ericsson.se [193.180.251.60]) by core3.amsl.com (Postfix) with ESMTP id 02CA63A6AC8 for ; Fri, 3 Apr 2009 04:39:57 -0700 (PDT) Received: from mailgw3.ericsson.se (unknown [127.0.0.1]) by mailgw3.ericsson.se (Symantec Mail Security) with ESMTP id A186120EE3 for ; Fri, 3 Apr 2009 13:40:58 +0200 (CEST) X-AuditID: c1b4fb3c-a7ee1bb000003b08-a5-49d5f5ca1258 Received: from esealmw129.eemea.ericsson.se (unknown [153.88.253.125]) by mailgw3.ericsson.se (Symantec Mail Security) with ESMTP id 477B220E5C for ; Fri, 3 Apr 2009 13:40:58 +0200 (CEST) Received: from esealmw129.eemea.ericsson.se ([153.88.254.177]) by esealmw129.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 3 Apr 2009 13:40:58 +0200 Received: from [147.214.183.173] ([147.214.183.173]) by esealmw129.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 3 Apr 2009 13:40:57 +0200 Message-ID: <49D5F5C9.4000302@ericsson.com> Date: Fri, 03 Apr 2009 13:40:57 +0200 From: Magnus Westerlund User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: Behave WG X-Enigmail-Version: 0.95.7 Content-Type: multipart/mixed; boundary="------------090400030608040302030306" X-OriginalArrivalTime: 03 Apr 2009 11:40:57.0997 (UTC) FILETIME=[0E2D4BD0:01C9B451] X-Brightmail-Tracker: AAAAAA== Subject: [BEHAVE] [Fwd: Re: Last Call: draft-ietf-behave-nat-behavior-discovery (NAT Behavior Discovery Using STUN) to Experimental RFC] X-BeenThere: behave@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: mailing list of BEHAVE IETF WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Apr 2009 11:40:00 -0000 This is a multi-part message in MIME format. --------------090400030608040302030306 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit FYI Magnus Westerlund IETF Transport Area Director & TSVWG Chair ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- --------------090400030608040302030306 Content-Type: message/rfc822; name="Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NAT BehaviorDiscovery Using STUN) to Experimental RFC.eml" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename*0="Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-disco"; filename*1="very (NAT Behavior Discovery Using STUN) to Experimental RFC"; filename*2=".eml" Received: from esealmw127.eemea.ericsson.se ([153.88.254.171]) by esealmw103.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 3 Apr 2009 02:03:30 +0200 Received: from mailgw7.ericsson.se ([193.180.251.48]) by esealmw127.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 3 Apr 2009 02:03:30 +0200 Received: from mailgw7.ericsson.se (unknown [127.0.0.1]) by mailgw7.ericsson.se (Symantec Mail Security) with ESMTP id EC59F58C004; Fri, 3 Apr 2009 02:03:30 +0200 (CEST) X-AuditID: c1b4fb30-a8c31bb000004b77-9e-49d54e1388c7 Received: from mail.ietf.org (mail.ietf.org [64.170.98.32]) by mailgw7.ericsson.se (Symantec Mail Security) with ESMTP id 65C865663A79; Fri, 3 Apr 2009 01:45:23 +0200 (CEST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id D89EB3A6A31; Thu, 2 Apr 2009 16:44:04 -0700 (PDT) X-Original-To: ietf@core3.amsl.com Delivered-To: ietf@core3.amsl.com Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 2769D3A684C for ; Thu, 2 Apr 2009 16:44:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.234 X-Spam-Level: X-Spam-Status: No, score=-2.234 tagged_above=-999 required=5 tests=[AWL=0.364, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7g-iF0+4EOxy for ; Thu, 2 Apr 2009 16:44:01 -0700 (PDT) Received: from blu0-omc2-s31.blu0.hotmail.com (blu0-omc2-s31.blu0.hotmail.com [65.55.111.106]) by core3.amsl.com (Postfix) with ESMTP id D5B763A67B1 for ; Thu, 2 Apr 2009 16:44:00 -0700 (PDT) Received: from BLU137-W23 ([65.55.111.72]) by blu0-omc2-s31.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 2 Apr 2009 16:45:02 -0700 Message-ID: X-Originating-IP: [131.107.0.103] From: Bernard Aboba To: Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NAT Behavior Discovery Using STUN) to Experimental RFC Date: Thu, 2 Apr 2009 16:45:02 -0700 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 02 Apr 2009 23:45:02.0637 (UTC) FILETIME=[0AC985D0:01C9B3ED] X-BeenThere: ietf@ietf.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: IETF-Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1573006912==" Sender: ietf-bounces@ietf.org Errors-To: ietf-bounces@ietf.org X-Brightmail-Tracker: AAAAAw4v9wkOMFYsDjCcIQ== Return-Path: ietf-bounces@ietf.org --===============1573006912== Content-Type: multipart/alternative; boundary="_f8d282ac-0088-4ec7-908d-e14bd33b75b5_" --_f8d282ac-0088-4ec7-908d-e14bd33b75b5_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Cullen Jennings said: "I was somewhat shocked to see the draft in IETF Last Call. The last time t= his draft was discussed at the microphone in Behave=2C many people were ver= y concerned that it id not possible to correctly characterize a NAT without= using more than one address behind the NAT. The tests done on on NATs by t= he researches at MIT did that=2C so did the the stuff from Cornell=2C as di= d draft-jennings-behave-test-results. The reason why this was needed is lar= gely the reason why the IETF invented ICE. Initially folks thought that STU= N alone would be enough to do NAT traversal. This turned out not to be true= =2C STUN deprecated those parts and ICE was started. This draft fails to de= scribe the types of test that have actually been found to work and just rei= nstates the stuff that was deployed and failed and then deprecated out of S= TUN.=20 Now this draft pays some lip service to the fact that it basically won't wo= rk. You can read section 1=20 and get the full idea. The first and 2'nd par basically say this won't work= . Then para 3 proposes this is experiment to find out something we already = know the answer to. When this work was chartered=2C it was about making a w= ay to characterize NATs and describe them in a controlled lab like environm= ent. It was not about resurrecting exactly the part of STUN that had been t= ried=2C failed =2C and deprecated." =20 There are several distinct issues here: a. Whether the draft faithfully represents the reliability of the mechanism= described and the state of IETF standardization efforts in this area.=20 b. Whether the draft prescribes use of the mechanism in ways that are appro= priate (and different from RFC 3489). =20 c. Whether the document is appropriate for publication as an Experimental R= FC.=20 d. Whether the draft fulfills the work item specified in the BEHAVE WG char= ter.=20 =20 With respect to a=2C here is what Section 1 says: =20 " This experimental STUN usage does not allow an application behind a NAT to make an absolute determination of the NAT's characteristics. NAT devices do not behave consistently enough to predict future behaviour with any guarantee. This STUN usage provides information about observable transient behavior=3B it only truly determines a NAT's behavior with regard to the STUN server used and the particular ports used at the instant the test is run. Applications requiring reliable reach between two particular endpoints must establish a communication channel through a NAT using another technique. IETF has proposed standards including ICE [I-D.ietf-mmusic-ice] and OUTBOUND [I-D.ietf-sip-outbound] for establishing communication channels when a publicly accessible rendezvous service is available. This usage provides techniques which are powerful diagnostic tools in the hands of a network administrator or system programmer trying to determine the causes of network failure=3B particularly when behavior varies by load=2C destination=2C or other factors that may be related to NAT behavior. " =20 Given this statement=2C it seems to me that the document isn't claiming tha= t the usage enables the reliable determination of NAT characteristics=2C an= d that it recommends ICE for that purpose. So I'd say that the document is= accurate in this respect.=20 =20 With respect to b=2C the document does describe experimental use in P2P app= lications: =20 This draft also proposes experimental applications of NAT Behavior Discovery STUN for real-time selection of parameters for protocols in situations where a publicly accessible rendezvous service is not available. One such application is role selection in P2P networks based on statistical experience with establishing connections and diagnosing NAT behavior with a variety of peers. The experimental question is whether such a test is useful. If a node trying to join an overlay as a full peer when its NAT prevents sufficient connectivity and then withdrawing is expensive or leads to unreliable or poorly performing operation=2C then even if the behavior discovery check is only "correct" 75% of the time=2C its relative cheapness may make it very useful for optimizing the behavior of the overlay network. Section 2.2 describes this experimental application in more detail and discusses how to evaluate its success or failure. This particular usage seems to overlap with the ones envisaged in RFC 3489= =2C and so it seems to me that Cullen does have a point about whether such = an "experiment" would really yield new knowledge=2C or whether the outcome = is already well understood (e.g. lots of situations in which it is already = known that the "experiment" will fail).=20 =20 Another described use is diagnosis. However=2C in this use the diagnoser w= ould presumably want as much information as possible about the behavior of = the NAT in question in order to figure out why their application or service= isn't working with it. Given that=2C do we believe that the diagnostic me= chanisms described in the document are the best that the IETF can produce= =2C given the state of existing knowledge? The evidence seems to indicate = that we can do better.=20 =20 With respect to c=2C given the amount of experimentation that has already o= curred=2C and the slim chances that this publication would lead to a future= standardization effort (aside from ICE or RFC 3489bis which are independen= t)=2C I'd say that justification for publication as an Experimental RFC is = somewhat shaky. =20 =20 With respect to d=2C the work item corresponding to this document appears t= o be the following: =20 "Submit experimental document that describes how an application can determi= ne the type of NAT it is behind"=20 =20 Given the issues raised below=2C it would not appear to me that this docume= nt in its current state satisfies the charter work item.=20 =20 In terms of what should happen next=2C my take is that this document should= go back to the WG for further baking.=20 =20 Cullen Jenning also said: =20 Specific problems with the draft.... 2.2 - this just won't work. The test described in this draft will not find = out if the node is behind an endpoint independent nat. I have specific nats= where it won't work. I have explained to the authors why it won't work. Th= e answer I get back is "it might work some of the time". It true it might w= ork some of the time but we all agree there are many NATs for which it will= not work. Other section that don't work are 3.1=2C 3.2=2C 3.3=2C 3.4=2C 3.= 5=2C 3.5 - uh all of them actually. I'm glad to provide details on why they= don't work but I have in the past and we not really debating if they work = or not. The authors believe there is sufficient text at the beginning of th= e draft in section 1 that it is OK that these fail in many cases and don't = need to be mentioned again. We not debating these work some of the but not = all the time - everyone agrees on that. Section 4.1 - The results in here w= ill be just wrong for ports different than the one the test was run on. The= response to this was to add "use same port when possible". That's not goin= g to exactly cause applications to work. Section 4.2 - Can't really separat= e the topic from if UDP is blocked from if the STUN server is down. Section= 4.4 - this fails if the port was recently used for similar tests from same= stun server. There no way to know this as an application. This type of tes= t can work in lab condition where all traffic on NAT is controlled but it o= perational networks it will fail. It is possible to do timing testing using= just the change ip flag. The REPSONSE-TARGET stuff is not needed and open = up the possibility to have a STUN server send packets to places that it sho= uld not which causes IDS system to black list all traffic from the STUN ser= ver thus making it unusable for other clients. The ability to tell the STUN= server to send packets to arbitrary locations would be fine for a system i= n a lab used to characterize a NAT but is not a good idea for internet depl= oyed STUN servers. The bulk of these issues were sent Aug 28 to behave list= during the 2nd WGLC. I requested agenda time during IETF 74 to discuss the= se issues but it was denied. In summary -The approaches described in this d= raft are known to fail with many NATs. I don't see any evidence of the WG a= ctually having read this draft much less have consensus on the approach in = it. I think the WG should spend meeting time to discuss the topic and decid= e what to do. The key topic in my mind is we are defining a document that a= llows us to characterize a NAT in a lab or if we are trying to make somethi= ng that works in field and can be used to aid NAT traversal in applications= . Cullen On Mar 10=2C 2009=2C at 8:44 AM=2C The IESG wrote: The IESG has received a request from the Behavior Engineering for Hindrance Avoidance WG (behave) to consider the following document: - 'NAT Behavior Discovery Using STUN ' as an Experimental RFC The IESG plans to make a decision in the next few weeks=2C and solicits final comments on this action. Please send substantive comments to the ietf= at ietf.org mailing lists by 2009-03-31. Exceptionally=2C comments may be sent to iesg at ietf.org instead. In either case=2C please retain the beginning of the Subject line to allow automated sorting. The file can be obtained via http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-discover= y-06.txt IESG discussion can be tracked via https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&dTag= =3D15728&rfc_flag=3D0 The following IPR Declarations may be related to this I-D: https://datatracker.ietf.org/ipr/919/ https://datatracker.ietf.org/ipr/945/ --_f8d282ac-0088-4ec7-908d-e14bd33b75b5_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Cullen Jennings said:

"I was somewhat sho= cked to see the draft in IETF Last Call. The last time this draft was d= iscussed at the microphone in Behave=2C many people were very conc= erned that it id not possible to correctly characterize a NAT with= out using more than one address behind the NAT. The tests done on = on NATs by the researches at MIT did that=2C so did the the stuff = from Cornell=2C as did draft-jennings-behave-test-results. The rea= son why this was needed is largely the reason why the IETF invented ICE. Initially folks thought that STUN alone would be enough to do NAT traversal. This turned out not to be true=2C STUN deprecated those p= arts and ICE was started. This draft fails to describe the types o= f test that have actually been found to work and just reinstates t= he stuff that was deployed and failed and then deprecated out of S= TUN. 

Now this draft pays some lip service to the fact that it basically won't work. You can read section 1 

and get the full idea. The first and 2'nd par basically say th=
is won't work. Then para 3 proposes this is experiment to find out=
 something we already know the answer to. When this work was chart=
ered=2C it was about making a way to characterize NATs and describ=
e them in a controlled lab like environment. It was not about resu=
rrecting exactly the part of STUN that had been tried=2C failed =
=2C and deprecated."

 =3B

There are several distinct issues here:

a. Whether the draft faithfully represents the reliability of the mecha=
nism described and the state of IETF standardization efforts in this area. =


b. Whether the draft prescribes use of the mechanism in =3Bways tha=
t are =3Bappropriate (and different from RFC 3489).  =3B

c. Whether the document is appropriate for publication as an Experiment=
al RFC. 

d. Whether the draft fulfills the work item specified in the BEHAVE WG =
charter. 

 =3B

With respect to a=2C here is what Section 1 says:

 =3B

" =3B =3BThis experimental STUN usage does not allow an applica=
tion behind a
 =3B =3B NAT to make an absolute determination of =
the NAT's characteristics.
 =3B =3B NAT devices do not behave co=
nsistently enough to predict future
 =3B =3B behaviour with any =
guarantee. =3B This STUN usage provides information
 =3B =3B=
 about observable transient behavior=3B it only truly determines a NAT's =3B =3B behavior with regard to the STUN server used and the part=
icular ports
 =3B =3B used at the instant the test is run. =
=3B Applications requiring reliable
 =3B =3B reach between two p=
articular endpoints must establish a communication
 =3B =3B chan=
nel through a NAT using another technique. =3B IETF has proposed
&nb=
sp=3B =3B standards including ICE [I-D.ietf-mmusic-ice] and OUTBOUND
 =3B =3B=
 [I=
-D.ietf-sip-outbound] for establishing communication channels wh=
en
 =3B =3B a publicly accessible rendezvous service is availabl=
e.

 =3B =3B This usage provides techniques which are powerfu=
l diagnostic tools in
 =3B =3B the hands of a network administra=
tor or system programmer trying to
 =3B =3B determine the causes=
 of network failure=3B particularly when behavior
 =3B =3B varie=
s by load=2C destination=2C or other factors that may be related to
&nbs=
p=3B =3B NAT behavior.
"

 =3B

Given this statement=2C it seems to me that the document isn't claiming=
 that the usage enables the reliable determination of NAT characteristics=
=2C and that it recommends ICE for that purpose. =3B So I'd say that th=
e document is accurate in this respect. 

 =3B

With respect to b=2C the document does =3Bdescribe experimental&nbs=
p=3Buse in P2P applications:

 =3B

 =3B =3B This draft also proposes experimental applications of =
NAT Behavior
 =3B =3B Discovery STUN for real-time selection of =
parameters for protocols in
 =3B =3B situations where a publicly=
 accessible rendezvous service is not
 =3B =3B available. =
=3B One such application is role selection in P2P networks
 =3B =
=3B based on statistical experience with establishing connections and
&n=
bsp=3B =3B diagnosing NAT behavior with a variety of peers. =3B The=
 experimental
 =3B =3B question is whether such a test is useful=
. =3B If a node trying to join
 =3B =3B an overlay as a full=
 peer when its NAT prevents sufficient
 =3B =3B connectivity and=
 then withdrawing is expensive or leads to unreliable
 =3B =3B o=
r poorly performing operation=2C then even if the behavior discovery
&nb=
sp=3B =3B check is only "correct" 75% of the time=2C its relative cheap=
ness may
 =3B =3B make it very useful for optimizing the behavio=
r of the overlay
 =3B =3B network. =3B <=
FONT color=3D#0066cc>Section 2.2 describes this experimental app=
lication in more
 =3B =3B detail and discusses how to evaluate i=
ts success or failure.


This particular usage seems to overlap with the ones envisaged in =
=3BRFC 3489=2C and so =3Bit seems to me that Cullen does have a point&n=
bsp=3Babout whether =3Bsuch an "experiment" would really =3Byield n=
ew knowledge=2C or whether the outcome is already well understood (e.g. lot=
s of situations in which it is already known that the "experiment" =3Bw=
ill fail). =3B

 =3B

Another described use is diagnosis. =3B However=2C in this use the =
diagnoser would presumably want as much information as possible about the b=
ehavior of the NAT in question in order to figure out why their application=
 or service isn't working with it. =3B Given that=2C do we believe that=
 the diagnostic mechanisms described in the document are the best that the =
IETF can produce=2C given the state of existing knowledge? =3B The evid=
ence seems to indicate that we can do better. 

 =3B

With respect to c=2C given the amount of experimentation that has alrea=
dy ocurred=2C and the slim chances that this =3Bpublication would lead =
to =3Ba future standardization effort (aside from ICE or RFC 3489bis wh=
ich are independent)=2C I'd say that justification for publication as an Ex=
perimental RFC is =3Bsomewhat shaky.  =3B

 =3B

With respect to d=2C the work item corresponding to this document appea=
rs to be the following:

 =3B

"Submit experimental document that describes how an application can det=
ermine the type of NAT it is behind" 

 =3B

Given the issues raised below=2C it would not appear to me that this do=
cument in its current state satisfies the charter work item. 

 =3B

In terms of what should happen next=2C my take is that this document sh=
ould go back to the WG for further baking. 

 =3B

Cullen Jenning also said:

 =3B
Specific problems with the =
draft....


2.2 - this just won't work. The test described in this draft will=
 not find out if the node is behind an endpoint independent nat. I=
 have specific nats where it won't work. I have explained to the a=
uthors why it won't work. The answer I get back is "it might work =
some of the time". It true it might work some of the time but we a=
ll agree there are many NATs for which it will not work. Other section that don't work are 3.1=2C 3=
.2=2C 3.3=2C 3.4=2C 3.5=2C 3.5 - uh all of them actually. I'm glad=
 to provide details on why they don't work but I have in the past =
and we not really debating if they work or not. The authors believ=
e there is sufficient text at the beginning of the draft in sectio=
n 1 that it is OK that these fail in many cases and don't need to =
be mentioned again. We not debating these work some of the but not=
 all the time - everyone agrees on that. 
Section 4.1 - The results in here will be just wrong for ports different than the one the test was run on. The response to this was <=
/TT>to add "use same port when possible". That's not going to exactly <=
/TT>cause applications to work. 
<=
TT>Section 4.2 - Can't really separate the topic from if UDP is blocked from if the STUN server is down. 
Section 4.4 - this fails if the port was recently used for similar tests from same stun server. There no way to know this as an application. This type of test can work in lab condition where all <=
TT>traffic on NAT is controlled but it operational networks it will fail. <=
/TT>
It is possible to do timing testin=
g using just the change ip flag. The REPSONSE-TARGET stuff is not =
needed and open up the possibility to have a STUN server send pack=
ets to places that it should not which causes IDS system to black =
list all traffic from the STUN server thus making it unusable for =
other clients. The ability to tell the STUN server to send packets=
 to arbitrary locations would be fine for a system in a lab used t=
o characterize a NAT but is not a good idea for internet deployed =
STUN servers. 
The bulk of these i=
ssues were sent Aug 28 to behave list during the 2nd WGLC. I reque=
sted agenda time during IETF 74 to discuss these issues but it was=
 denied. 
In summary -The approach=
es described in this draft are known to fail with many NATs. I don=
't see any evidence of the WG actually having read this draft much=
 less have consensus on the approach in it. I think the WG should =
spend meeting time to discuss the topic and decide what to do. The=
 key topic in my mind is we are defining a document that allows us=
 to characterize a NAT in a lab or if we are trying to make someth=
ing that works in field and can be used to aid NAT traversal in ap=
plications. 
Cullen <=3Bin my roll as indi=
vidual contributor and ex chair of behave>=3B





On Mar 10=2C 2009=2C at 8:44 AM=2C The IESG wrote:




The IESG has received a reque=
st from the Behavior Engineering for
Hindrance Avoidance WG (behave) to consider the following document:

- 'NAT Behavior Discovery Using STUN '
  <=3Bdraft-ietf-behave-nat-behavior-discovery-06.txt>=3B as an Experim=
ental
RFC

The IESG plans to make a decision in the next few weeks=2C and solicits

final comments on this action. Please send substantive comments t=
o the 
ietf at ietf.org mailing lis=
ts by 2009-03-31. Exceptionally=2C
comments may be sent to iesg at ietf.org instead. In either case=2C please
retain the beginning of the Subject line to allow automated sorting.

The file can be obtained via
http://www.ietf.o=
rg/internet-drafts/draft-ietf-behave-nat-behavior-discovery-06.txt


IESG discussion can be tracked via
https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&=
amp=3BdTag=3D15728&=3Brfc_flag=3D0

The following IPR Declarations may be related to this I-D:

https://datatracker.ietf.org/ipr/919/
https://datatracker.ietf.org/ipr/945/



=

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From bbl@lowekamp.net  Fri Apr  3 13:19:01 2009
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Responding to Cullen's comments on draft-ietf-behave-nat-behavior-discovery

Many of the questions you raise point to the same question of whether
tests or techniques that are known to fail on a certain percentage of
NATs under a certain percentage of operating conditions are
nevertheless valuable.  behavior-discovery has an applicability
statement http://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discove=
ry-06#section-1
that discusses those issues in some detail.  I spent enough time
wording that statement and discussing it with various people that I
think it is best to refer to that statement.

You also repeatedly uses phrases such as "basically won't work" and
"it might work."   The comes down to the value of "certain percentage"
as used above.  My experience with these techniques, and the
experience of those who have used such techniques recently, is that
they are far more reliable than that, into the 90% range, particularly
when used correctly.  That is not high enough that we could go back to
3489---all techniques require fallbacks because they fail, and 90% is
far, far too low of a success rate---but it is high enough that
applications can make useful decisions based on that information,
provided they have a fallback in cases where the information is wrong.
 And those are the conditions of the experiment.


On Tue, Mar 31, 2009 at 11:08 PM, Dan Wing  wrote:
> Forwarded for those that don't follow the main IETF list.
> -----Original Message-----
> From: ietf-bounces@ietf.org [mailto:ietf-bounces@ietf.org] On Behalf Of C=
ullen
> Jennings
> Sent: Tuesday, March 31, 2009 9:53 AM
> To: IETF Discussion; IESG IESG
> Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery
> (NATBehavior Discovery Using STUN) to Experimental RFC
>
>
> I was somewhat shocked to see the draft in IETF Last Call. The last
> time this draft was discussed at the microphone in Behave, many people
> were very concerned that it id not possible to correctly characterize
> a NAT

This is not true.  behavior-discovery was briefly presented at IETF71
without any comments and at IETF70 with only minor comments.   The
last time it was discussed at length at the mic was at IETF69, which
was where it was decided to change it from standards track to
experimental.  However, let me address two specific points here
regarding your characterization of that discussion:

"many people were very concerned":  What concerns people had were
about its previous standards-track status.  Subsequent feedback on the
list and at IETF70 have indicated these concerns are resolved.

"that it is not possible to correctly characterize a NAT": First, let
me emphasize that the key distinction between 3489 and
behavior-discovery is that behavior-discovery is very clear that it is
not possible to characterize a NAT, that only snapshots of behavior
for particular source-dest tuple at an instant in time are possible.


> without using more than one address behind the NAT.  The tests
> done on on NATs by the researches at MIT did that, so did the the
> stuff from Cornell, as did draft-jennings-behave-test-results.

Multiple addresses are definitely required to characterize the NAT (to
the extent it's ever possible), but as behavior-discovery is very
clear that it is not trying to replicate that aspect of the 3489
behavior, is not precisely relevant.

> The
> reason why this was needed is largely the reason why the IETF invented
> ICE. Initially folks thought that STUN alone would be enough to do NAT
> traversal. This turned out not to be true, STUN deprecated those parts
> and ICE was started. This draft fails to describe the types of test
> that have actually been found to work and just reinstates the stuff
> that was deployed and failed and then deprecated out of STUN.

This draft makes no claim that it is duplicating or attempting to
mimic the original intention of 3489 or the capabilities of ICE.  It
carefully describes when the tests it includes can be used and
presents examples of how an application might make use of it for
situations that ICE does not address.  The only use by applications
proposed in the draft (as an experiment) is for an application that
uses it for initial mode selection but is capable of adapting to its
actual experience on the network.

> Now this draft pays some lip service to the fact that it basically
> won't work. You can read section 1 and get the full idea.

This term "basically won't work" is a gross oversimplification.  It's
also not a technical analysis, which makes it difficult to respond to
in a technical way.

More generally, one of the important differences between 3489 and ICE
is that ICE ensures there is always a fallback to TURN, and thus
avoids the problem experienced by 3489-based applications that tried
to determine in advance whether they would need a relay and what their
peer reflexive address will be, which are both impossible.
behavior-discovery requires an application using it to have a
fallback, but unlike ICE's focus on the problems inherent in VoIP
sessions, doesn't assume that it will only be used to establish a
connection between a single pair of machines, and so alternative
fallback mechanisms may make sense.  i.e. in a P2P application, it may
be possible to simply switch out of the role where such connections
need to be established, or to select an alternative indirect route if
the peer discovers that in practice, 10% of its connection attempts
fail.

> The first
> and 2'nd par basically say this won't work. Then para 3 proposes this
> is experiment to find out something we already know the answer to.

The experiment described is so totally different than 3489's claim
that a NAT can be characterized, labeled, and all future application
decisions rely on that behavior that it's hard to respond to this.

> When this work was chartered, it was about making a way to
> characterize NATs and describe them in a controlled lab like
> environment.

Here is how the work was chartered in the May 2007 update to the BEHAVE cha=
rter:

Sep 2007	  	Submit standards-track document that describes how an
application can determine the type of NAT it is behind

So it was not at all chartered for lab analysis, it was chartered for
use by an application.

> It was not about resurrecting exactly the part of STUN
> that had been tried, failed , and deprecated.

As already stated, it deliberately tries to outline when these
techniques are applicable and when they aren't.

>
> Specific problems with the draft....

For other readers' benefit, the section numbers you use in this
section refer to revision -04 of the draft.  The current revision is
-06.

>
> 2.2 - this just won't work. The test described in this draft will not
> find out if the node is behind an endpoint independent nat. I have
> specific nats where it won't work. I have explained to the authors why
> it won't work. The answer I get back is "it might work some of the
> time". It true it might work some of the time but we all agree there
> are many NATs for which it will not work.

(I'm not sure what section this text was referring to)

Again, we're not searching for an existence proof of NATs where it doesn't =
work.

More importantly, don't put words into other people's mouths,
especially when the statement is not true.  You have never received an
"it might work some of the time" response.   The response has always
been of the form that it works most of the time on most NATs.

If you have useful information on the population of NATs that fail
with these techniques a significant amount of the time, please share
that information.  I've asked, but have not received any information.

>
> Other section that don't work are 3.1, 3.2, 3.3, 3.4, 3.5, 3.5 - uh
> all of them actually. I'm glad to provide details on why they don't
> work but I have in the past and we not really debating if they work or
> not. The authors believe there is sufficient text at the beginning of
> the draft in section 1 that it is OK that these fail in many cases and
> don't need to be mentioned again. We not debating these work some of
> the but not all the time - everyone agrees on that.
>
> Section 4.1 - The results in here will be just wrong for ports
> different than the one the test was run on. The response to this was
> to add "use same port when possible". That's not going to exactly
> cause applications to work.

First, this is something of a corner case in any event.  Secondly, a
large number of applications do use the same port for all of their
communication.  So, yes, they are perfectly capable of allocating one
port (or a small number of ports), testing, and using that (those)
port(s) for their communication.  And having a draft that points out
the advantages of doing so is, by itself, useful.

>
> Section 4.2 - Can't really separate the topic from if UDP is blocked
> from if the STUN server is down.

The draft recommends multiple STUN servers for redundancy, but do we
really want to engage in a reduction to the absurd of "it's impossible
to diagnose network behavior because you can never differentiate
between host failure vs network failure in the absence of responses"?
True.  But not interesting.

>
> Section 4.4 - this fails if the port was recently used for similar
> tests from same stun server. There no way to know this as an
> application. This type of test can work in lab condition where all
> traffic on NAT is controlled but it operational networks it will fail.

I believe this question is adequately addressed (and limitations
discussed) in Section 4.1 (of the current draft).  That section was
posted to the mailing list prior to IETF73, and given to you directly,
but I am not aware of receiving any comments from you reflecting its
presence.

>
> It is possible to do timing testing using just the change ip flag. The
> REPSONSE-TARGET stuff is not needed and open up the possibility to
> have a STUN server send packets to places that it should not which
> causes IDS system to black list all traffic from the STUN server thus
> making it unusable for other clients. The ability to tell the STUN
> server to send packets to arbitrary locations would be fine for a
> system in a lab used to characterize a NAT but is not a good idea for
> internet deployed STUN servers.

Please read the draft for the authentication and state required when
using XOR-RESPONSE-TARGET.  Your comments do not apply to the current
(or recent) revisions of the draft.  This issue has been extensively
discussed on the mailing list and in wg sessions, and resolved.  This
question was also addressed in my response to your previous comments
in August (see below).


>
> The bulk of these issues were sent Aug 28 to behave list during the
> 2nd WGLC. I requested agenda time during IETF 74 to discuss these
> issues but it was denied.

I'm including at the bottom of this message a copy of the issues
raised Aug 28 with my responses to them.  Those issues were addressed
in the -05 revision in November.  There has been no subsequent list
discussion of those topics.

>
> In summary -The approaches described in this draft are known to fail
> with many NATs. I don't see any evidence of the WG actually having
> read this draft much less have consensus on the approach in it.

I think the number of people providing comments both at the mic at the
various sessions and on the mailing list argues against this
statement.  In reviewing these comments, I came across this statement
reviewing whether the applicability statement addressed the concerns
about the draft after it was moved to experimental:

----------------------------------------------------------
To: Behave WG 
From: Cullen Jennings 
Date: Thu, 29 Nov 2007 22:13:09 -0800
Subject: [BEHAVE] behave-nat-behavior-discovery

I like the way you scope what this can and can not be used for. It
removed a lot of my concerns about it.

Cullen 
----------------------------------------------------------

which makes me wonder what has changed since then?


Bruce

> I
> think the WG should spend meeting time to discuss the topic and decide
> what to do. The key topic in my mind is we are defining a document
> that allows us to characterize a NAT in a lab or if we are trying to
> make something that works in field and can be used to aid NAT
> traversal in applications.
>
> Cullen 
>
>
>
>
>
> On Mar 10, 2009, at 8:44 AM, The IESG wrote:
>
>> The IESG has received a request from the Behavior Engineering for
>> Hindrance Avoidance WG (behave) to consider the following document:
>>
>> - 'NAT Behavior Discovery Using STUN '
>> =C2=A0  as an Experimen=
tal
>> RFC
>>
>> The IESG plans to make a decision in the next few weeks, and solicits
>> final comments on this action. =C2=A0Please send substantive comments to
>> the
>> ietf@ietf.org mailing lists by 2009-03-31. Exceptionally,
>> comments may be sent to iesg@ietf.org instead. In either case, please
>> retain the beginning of the Subject line to allow automated sorting.
>>
>> The file can be obtained via
>>
> http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-discov=
ery-0
> 6.txt
>>
>>
>> IESG discussion can be tracked via
>>
> https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&dTag=
=3D15728&
> rfc_flag=3D0
>>
>> The following IPR Declarations may be related to this I-D:
>>
>> https://datatracker.ietf.org/ipr/919/
>> https://datatracker.ietf.org/ipr/945/
>>
>>
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>
> _______________________________________________
> Ietf mailing list
> Ietf@ietf.org
> https://www.ietf.org/mailman/listinfo/ietf
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>



Below is the response to Cullen's email of Aug 28, which includes
those questions inline.  The -05 version addressed these concerns,
although frequently in different ways then described below because it
also reflected updates in response to Magnus' AD review.

On Tue, Sep 2, 2008 at 4:35 PM, Bruce Lowekamp  wro=
te:
> Sorry, meant to respond to this over the weekend.
>
> I'm sure these won't be the only issues raised that need clarification.
>
> Bruce
>
>
> Cullen Jennings wrote:
>>
>> Few comments
>>
>> Test 1: The first test defined in section 4.1 You have to have a good
>> way to distinguish not UDP connectivity from the case where the STUN
>> server is down or someone put in the wrong address.
>>
>
> That text should probably be clarified to remind the reader that the
> test applies only to connectivity to the particular STUN server.  (and
> that either the client or server could be misconfigured)  In general,
> though, that qualifier is at the beginning of the document and applies
> to everything in it.
>
>
>> Test 2: In test 4.2, I think it is important to identity that this test
>> has to be done for every single port the application wants to use
>> because we know that the results for different ports are often not the s=
ame
>>
>
> Will add a note that in some situations behavior may vary port-by-port.
>  Actually, this should probably also be highlighted earlier in the
> document.
>
>
>> Test 3: This would be better if it mandated using a random source port
>> and highlight that if any device had recently done test 2 on the same
>> port, this test will fail to get the correct result and it fails in a
>> way that suggests things will work that don't. It may sound odd to think
>> one might get the same port but often when an embedded system reboots,
>> it might run the same tests again at the same IP address and with ports
>> like this.
>>
>
> that's a good idea.  Will clarify that in 3.2 and 4.3.  Will also add
> some text to point out the interaction between this and the previous issu=
e.
>
>> Section 4.4 - given the rate limiting of NATs, I would give some advice
>> that was more implementable than "care must be given". I'd specifically
>> rate limit to something like no more than X stun packets per second. It
>> would be nice to discuss here how long these tests can take even when
>> they are done in parallel.
>>
>
> Do you have a suggestion for the value of X?  I don't think 4787
> explicitly addresses this.
>
>
>> Section 4.5 - the XOR-RESPONSE-TARGET just sort comes out of nowhere and
>> is a bit hard to understand when reading the draft from front to back
>>
>
> It was used earlier in 3.3, but I agree it's not well defined there,
> either.  Will try to make the introduction clearer.
>
>> The whole XOR-RESPONSE-TARGET has all the same security problems and
>> issues as TURN. Instead of reinventing it all here, why not just use
>> TURN to be able to send the packets to where you want them?
>>
>
> I disagree that the same security issues are present (or at least in the
> same magnitude).  In particular, XOR-RESPONSE-TARGET is even more
> limited in applicability in order to prevent it from being used for any
> significant type of attack.  In addition to the precautions already in
> the current text, a previous revision required authentication for all
> uses of XOR-RESPONSE-TARGET, but many people objected to this being too
> strong compared to the potential threat this method offered, and instead
> group consensus (almost unanimous as I recall) was for allowing the
> current CACHE-TIMEOUT state/rate-limiting approach while allowing those
> who desire to still require authentication.  While you're right that
> there is still a risk of a state attack on the server, the state
> required to store is very small, is stored only on transactions that
> request it, and the CACHE-TIMEOUT attribute provides feedback to the
> client whether the request can complete.  Furthermore, the consequences
> of being unable to server new requests due to a DoS attack on the server
> are not nearly as dire for behavior discovery as for TURN.
>
> Regarding TURN as a solution, that seems incredibly heavyweight for this
> application, although I don't see a reason not to say that this test
> could be implemented that way.  You'd have to be careful, however, to
> make sure that neither end of the TURN connection is running any
> keepalives, which might be difficult since TURN specifies both STUN
> keepalives and TURN keepalives for its connections.
>
>> In section 6.1 where you have "the server must verity that it has
>> previously..." I think this must needs to be a MUST
>>
>
> yes
>
>> I will note the RESPONSE-TARGET design forces the server to remember for
>> some time some state about every binding request.
>>
>
>  From Section 5:
>
>  If a client intends to utilize an XOR-RESPONSE-TARGET attribute in
>    future transactions, as described in Section 4.5, then it MUST
>    include a CACHE-TIMEOUT attribute in the Request with the value set
>    greater than the longest time duration it intends to test.
>
> so it only needs to store state for binding requests that included the
> CACHE-TIMEOUT attribute.
>
>> Section 5.1 - the SRV service name needs to be in the IANA registry
>>
>
> true
>
>>
>> Cullen 
>>

From philip_matthews@magma.ca  Fri Apr  3 15:24:49 2009
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Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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On Thu, 2-Apr-09, at 20:49 , Brian E Carpenter wrote:

> On 2009-03-30 16:17, Fred Baker wrote:
>>
>> On Mar 29, 2009, at 6:40 PM, Keith Moore wrote:
>>
>>> Personally, the only sense that I think the magic prefix should be a
>>> "default" is in the sense of "last resort".  As in, you SHOULD use  
>>> an
>>> LIR prefix, and all of the relevant protocols and software need to
>>> accommodate the ability to configure that LIR prefix.  But if for  
>>> some
>>> reason you actually think you want to use a magic prefix, please use
>>> this one allocated by IANA for that purpose, rather than (say)  
>>> pulling
>>> one out of thin air, or using a prefix allocated for a different  
>>> purpose.
>>
>> If the working group would like me to word it that way, I'm OK with  
>> that.
>

My sense is: this is the prefix a device should use if the device does  
not have an LIR prefix. A device may obtain an LIR prefix in a number  
of ways (configuration, DHCP, ...) but if none of those ways are  
giving it a LIR prefix, then it should use the default.

Myself, I suspect that smaller deployments might just stick with the  
default, while larger deployments will use an LIR prefix.

- Philip


From moore@network-heretics.com  Sat Apr  4 02:49:26 2009
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Cc: Behave WG , Fred Baker 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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>>>> Personally, the only sense that I think the magic prefix should be a
>>>> "default" is in the sense of "last resort".  As in, you SHOULD use an
>>>> LIR prefix, and all of the relevant protocols and software need to
>>>> accommodate the ability to configure that LIR prefix.  But if for some
>>>> reason you actually think you want to use a magic prefix, please use
>>>> this one allocated by IANA for that purpose, rather than (say) pulling
>>>> one out of thin air, or using a prefix allocated for a different
>>>> purpose.
>>>
>>> If the working group would like me to word it that way, I'm OK with
>>> that.
>>
> 
> My sense is: this is the prefix a device should use if the device does
> not have an LIR prefix. A device may obtain an LIR prefix in a number of
> ways (configuration, DHCP, ...) but if none of those ways are giving it
> a LIR prefix, then it should use the default.

I think that's a bit too strong, especially if we believe that using a
single, distinguished prefix could do harm.

Keith

From xing@cernet.edu.cn  Sat Apr  4 07:26:07 2009
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Cc: Behave WG , Hiroshi MIYATA , Fred Baker , Behave Chairs 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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Hi, Brian,

Brian E Carpenter 写é“:
> Xing Li,
>
> I think we agree.
>   

This is great! Thanks!

xing

> Regards
>    Brian Carpenter
>    University of Auckland
>
> On 2009-03-29 03:05, Xing Li wrote:
>   
>> Brian E Carpenter 写é“:
>>     
>>> Agreed that it would be a very bad idea. But I don't understand
>>> why it would happen. It doesn't happen with 2002::/8.
>>> Actually the analysis in RFC3056 states that this WKP can only be used
>>> safely if the IPv4 network is not fragmented, i.e. you MUST NOT
>>> use 6to4 after the IPv4 global routing breaks up (in 500 years
>>> from now?). There would need to be a similar rule for a NAT64 WKP,
>>> I think.
>>>  
>>> And the same practice would need to be used for the WKP: more specifics
>>> not allowed. BTW that might recreate some of the black hole issues
>>> we see for 6to4. So maybe a WKP is not such a good idea.
>>>
>>>     Brian
>>>
>>>
>>>   
>>>       
>> I see the point now. But in the stateless mode, the effect to the global
>> IPv6 Internet makes the difference.
>>
>>   For the IPv6 Internet to an IPv4-network scenario, the WKP doesn't
>>   work if the IPv4 is using private IPv4 addresses.  With public IPv4
>>   addresses, each IPv4 site will inject a route in the IPv6 routing
>>   table, i.e. importing IPv4 routing table entropy into IPv6 routing
>>   table.  Therefore, the LIR should be selected.
>>
>>   For "an IPv4 network to IPv4 Internet" scenario, as shown in the
>>   following Figure, the stateless and stateful mode should be discussed
>>   separately"
>>
>>            ------                        -----           ------
>>          /  The   \       -----        /  An   \       /  The   \
>>         |  IPv4    |-----|Xlate|------|  IPv6   |-----|  IPv6    |
>>          \Internet/       -----        \Network/       \Internet/
>>            ------                        -----           ------
>>                                   A                 B
>>
>>                  Figure: An IPv4 network to IPv4 Internet
>>
>>   1.  If Xlate is stateless, "an IPv6 network" will consist of hosts
>>   using IVI6 addresses (more specifics of the IPv4 embedded IPv6
>>   addresses).  The IVI6 hosts can communicate with both the global IPv4
>>   Internet and the global IPv6 Internet.  The stateless Xlate supports
>>   both IPv6 initiated communication and the IPv4 initiated
>>   communications.
>>
>>   1.1 In border A, "an IPv6 network" will advertise IVI6 addresses to
>>   the Xlate and the Xlate will advertise the IPv4 embedded IPv6
>>   addresses corresponding to 0.0.0.0/0 to "an IPv6 network".
>>
>>   1.2 In border B, "an IPv6 network" will advertise IVI6 addresses with
>>   proper aggregation to the IPv6 Internet and the IPv6 Internet will
>>   advertise the global IPv6 routing table or 2000::/3 to "an IPv6
>>   network".  In other words, "an IPv6 network" should advertise the
>>   aggregated prefix of "an IPv6 network" and should neither advertise
>>   the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 nor IVI6.
>>   This can be achieved easily if LIR is used, but cannot be achieved if
>>   WKP is used, since WKP is independent of the aggregated prefix of "an
>>   IPv6 network".  In the case when WKP is used, the IVI6 must be
>>   advertised to the IPv6 Internet in order to communicate with other
>>   IPv6 hosts in the IPv6 Internet and this advertisement will
>>   eventually result in the injecting of the global IPv4 routing table
>>   into the global IPv6 routing system.
>>
>>   2.  If Xlate is stateful, "an IPv6 network" will consist of ordinary
>>   IPv6 addresses and Xlate maintains session-initiated states to map
>>   between ordinary IPv6 addresses and the IPv4 addresses in the IPv4
>>   address pool.  The stateful Xlate only supports IPv6 initiated
>>   communication.
>>
>>   2.1 In border A, "an IPv6 network" will advertise the aggregated
>>   prefix of "an IPv6 network" to the Xlate and the Xlate will advertise
>>   the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 to "an
>>   IPv6 network".
>>
>>   2.2 In border B, "an IPv6 network" will advertise the aggregated
>>   prefix of "an IPv6 network" to the IPv6 Internet and the IPv6
>>   Internet will advertise the global IPv6 routing table or 2000::/3 to
>>   "an IPv6 network".  There is no need to advertise the IPv4 embedded
>>   IPv6 addresses corresponding to 0.0.0.0/0 to the IPv6 Internet, if
>>   translation service of "an IPv6 Internet" is not supported to other
>>   IPv6 networks.  Therefore, the selection of WKP versus LIR is mainly
>>   the operational consideration.
>>
>> Please comment.
>>
>> xing
>>
>>
>>
>>     
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>   


From bbl@lowekamp.net  Sat Apr  4 10:55:32 2009
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Date: Sat, 4 Apr 2009 13:56:33 -0400
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From: Bruce Lowekamp 
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Cc: "draft-ietf-behave-nat-behavior-discovery@tools.ietf.org" , "behave@ietf.org" , "ietf@ietf.org" , Dan Wing 
Subject: Re: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Christian,

Thanks for the comments.  Responses inline.

On Wed, Apr 1, 2009 at 3:19 AM, Christian Huitema
 wrote:
> I tend to agree with Cullen on some points. Instead of a draft presenting=
 a set of algorithm, I would rather see a draft presenting a set of tools t=
hat can be useful for characterizing local connectivity, and presenting the=
se tools as justifying a new set of STUN options that applications develope=
rs could then use as they see fit.
>

So most people miss this, which may mean it needs to be clarified more
somehow, but the algorithm section is actually not normative.  The
STUN attributes and their processing is normative, but the intention
has always been that the algorithms be an example of what you can do
with them, but not necessarily the only thing you can do with them,
although probably a good starting point. (In fact, a few people have
suggested more complex tests using the existing attributes, but I've
hesitated to put anything like that in there.)

Within that structure, does that essentially meet what you're thinking
of?  Certainly some verbiage can be added to emphasize this point
more---since it's a common question, maybe it should be added.  It
would be possible to reverse the order, I suppose, and do things in
the other direction, although then for people who didn't follow the
whole 3489 evolution, I think it might be a really hard read to define
a bunch of stuff without explaining how it should be used.


> The draft proposes a set of algorithms to characterize a NAT. As Cullen p=
oints out, any of these algorithms has weaknesses. The main weakness is tha=
t the behavior of NAT is often transient, e.g. different port mapping algor=
ithms depending on whether or not the internal tables are near saturation, =
or not. So, any attempt to present an algorithm as a definitive classifier =
is, by nature, weak. On the other hand, even weak attempts are useful, espe=
cially in peer-to-peer applications, but also for network management and de=
bugging. There is a tradeoff between resource consumed and precision of the=
 characterization. This tradeoff is largely for the application developers =
and users to decide.
>

I think we are in agreement here.  The real test will be how
application protocols are designed to make use of these techniques.  I
have some ideas for how they would be designed in P2PSIP, but haven't
written anything up yet, trying to focus on just getting the basic
mechanism in.

What I would like to see happen is sort of like the UNSAF IAB
considerations.  If you're going to use these STUN attributes, you
must answer these questions.  I don't know if that's really necessary
since this draft is experimental---there will be enough of a "wait,
how are you using this experimental protocol?" that I think future
drafts will get scrutiny, and in fact that has already flagged a
couple of drafts as questionable already.

> The interesting question is, what mechanisms do application developers ne=
ed, in addition to the basic response system defined in STUN? Most of these=
 new mechanisms fall direct a server to send packets to a different address=
, to a different port, or at a different time, plus indeed a negotiation me=
chanism to determine whether such mechanisms are available. I don't see muc=
h harm in defining these mechanisms and the corresponding options. Indeed, =
I see some goodness in defining them once, in the IETF.
>
> The main goodness comes form a way to control the use of the mechanisms. =
Sending responses to a different address, to a different port, or at a diff=
erent time has a risk. Such mechanisms can be used for denial of service at=
tacks. If we are convinced that the draft mitigates such denial of service =
attacks, then we should register the corresponding attributes.
>

I believe the authentication and CACHE-TIMEOUT mechanisms in the draft
are sufficient for preventing DoS, and there was consensus for that
the last time the change was made and presented a few meetings ago,
but welcome any further comments on the issue.

Bruce



>
>
>> -----Original Message-----
>> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On Behalf
>> Of Dan Wing
>> Sent: Tuesday, March 31, 2009 8:09 PM
>> To: behave@ietf.org
>> Cc: draft-ietf-behave-nat-behavior-discovery@tools.ietf.org
>> Subject: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-
>> discovery (NATBehavior Discovery Using STUN) to Experimental RFC
>>
>> Forwarded for those that don't follow the main IETF list.
>>
>> Please reply to the list if you agree or disagree with the points raised
>> by
>> Cullen. =C2=A0Thanks.
>>
>> -d
>>
>>
>> -----Original Message-----
>> From: ietf-bounces@ietf.org [mailto:ietf-bounces@ietf.org] On Behalf Of
>> Cullen
>> Jennings
>> Sent: Tuesday, March 31, 2009 9:53 AM
>> To: IETF Discussion; IESG IESG
>> Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-
>> discovery
>> (NATBehavior Discovery Using STUN) to Experimental RFC
>>
>>
>> I was somewhat shocked to see the draft in IETF Last Call. The last
>> time this draft was discussed at the microphone in Behave, many people
>> were very concerned that it id not possible to correctly characterize
>> a NAT without using more than one address behind the NAT. The tests
>> done on on NATs by the researches at MIT did that, so did the the
>> stuff from Cornell, as did draft-jennings-behave-test-results. The
>> reason why this was needed is largely the reason why the IETF invented
>> ICE. Initially folks thought that STUN alone would be enough to do NAT
>> traversal. This turned out not to be true, STUN deprecated those parts
>> and ICE was started. This draft fails to describe the types of test
>> that have actually been found to work and just reinstates the stuff
>> that was deployed and failed and then deprecated out of STUN.
>>
>> Now this draft pays some lip service to the fact that it basically
>> won't work. You can read section 1 and get the full idea. The first
>> and 2'nd par basically say this won't work. Then para 3 proposes this
>> is experiment to find out something we already know the answer to.
>> When this work was chartered, it was about making a way to
>> characterize NATs and describe them in a controlled lab like
>> environment. It was not about resurrecting exactly the part of STUN
>> that had been tried, failed , and deprecated.
>>
>> Specific problems with the draft....
>>
>> 2.2 - this just won't work. The test described in this draft will not
>> find out if the node is behind an endpoint independent nat. I have
>> specific nats where it won't work. I have explained to the authors why
>> it won't work. The answer I get back is "it might work some of the
>> time". It true it might work some of the time but we all agree there
>> are many NATs for which it will not work.
>>
>> Other section that don't work are 3.1, 3.2, 3.3, 3.4, 3.5, 3.5 - uh
>> all of them actually. I'm glad to provide details on why they don't
>> work but I have in the past and we not really debating if they work or
>> not. The authors believe there is sufficient text at the beginning of
>> the draft in section 1 that it is OK that these fail in many cases and
>> don't need to be mentioned again. We not debating these work some of
>> the but not all the time - everyone agrees on that.
>>
>> Section 4.1 - The results in here will be just wrong for ports
>> different than the one the test was run on. The response to this was
>> to add "use same port when possible". That's not going to exactly
>> cause applications to work.
>>
>> Section 4.2 - Can't really separate the topic from if UDP is blocked
>> from if the STUN server is down.
>>
>> Section 4.4 - this fails if the port was recently used for similar
>> tests from same stun server. There no way to know this as an
>> application. This type of test can work in lab condition where all
>> traffic on NAT is controlled but it operational networks it will fail.
>>
>> It is possible to do timing testing using just the change ip flag. The
>> REPSONSE-TARGET stuff is not needed and open up the possibility to
>> have a STUN server send packets to places that it should not which
>> causes IDS system to black list all traffic from the STUN server thus
>> making it unusable for other clients. The ability to tell the STUN
>> server to send packets to arbitrary locations would be fine for a
>> system in a lab used to characterize a NAT but is not a good idea for
>> internet deployed STUN servers.
>>
>> The bulk of these issues were sent Aug 28 to behave list during the
>> 2nd WGLC. I requested agenda time during IETF 74 to discuss these
>> issues but it was denied.
>>
>> In summary -The approaches described in this draft are known to fail
>> with many NATs. I don't see any evidence of the WG actually having
>> read this draft much less have consensus on the approach in it. I
>> think the WG should spend meeting time to discuss the topic and decide
>> what to do. The key topic in my mind is we are defining a document
>> that allows us to characterize a NAT in a lab or if we are trying to
>> make something that works in field and can be used to aid NAT
>> traversal in applications.
>>
>> Cullen 
>>
>>
>>
>>
>>
>> On Mar 10, 2009, at 8:44 AM, The IESG wrote:
>>
>> > The IESG has received a request from the Behavior Engineering for
>> > Hindrance Avoidance WG (behave) to consider the following document:
>> >
>> > - 'NAT Behavior Discovery Using STUN '
>> > =C2=A0  as an Experim=
ental
>> > RFC
>> >
>> > The IESG plans to make a decision in the next few weeks, and solicits
>> > final comments on this action. =C2=A0Please send substantive comments =
to
>> > the
>> > ietf@ietf.org mailing lists by 2009-03-31. Exceptionally,
>> > comments may be sent to iesg@ietf.org instead. In either case, please
>> > retain the beginning of the Subject line to allow automated sorting.
>> >
>> > The file can be obtained via
>> >
>> http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-
>> discovery-0
>> 6.txt
>> >
>> >
>> > IESG discussion can be tracked via
>> >
>> https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&dTa=
g=3D
>> 15728&
>> rfc_flag=3D0
>> >
>> > The following IPR Declarations may be related to this I-D:
>> >
>> > https://datatracker.ietf.org/ipr/919/
>> > https://datatracker.ietf.org/ipr/945/
>> >
>> >
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From: Christian Huitema 
To: Bruce Lowekamp 
Date: Sat, 4 Apr 2009 15:22:24 -0700
Thread-Topic: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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From bbl@lowekamp.net  Sat Apr  4 18:15:45 2009
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Date: Sat, 4 Apr 2009 21:16:46 -0400
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From: Bruce Lowekamp 
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Cc: "draft-ietf-behave-nat-behavior-discovery@tools.ietf.org" , "behave@ietf.org" , "ietf@ietf.org" , Dan Wing 
Subject: Re: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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On Sat, Apr 4, 2009 at 6:22 PM, Christian Huitema
 wrote:
>> So most people miss this, which may mean it needs to be clarified more
>> somehow, but the algorithm section is actually not normative.
>
> Maybe, but the draft starts with 20 pages of algorithm discussion, and fo=
llows with 3 pages of attribute description. I would be much more supportiv=
e if the draft could be summed up as "this draft defines 6 STUN attributes =
and 2 response codes that can be used when characterizing the attributes of=
 NAT. It gives examples of possible algorithms that justify the allocation =
of the attributes. It provides security guidelines that prevent misuse of t=
he attributes." You probably don't need more than 5-6 pages for that.
>

Hmmm.  I'm not sure what you're counting here.  In -06 the algorithm
discussion runs from page 8 to 16 and the normative attribute and
behavior discussion runs from 16 to 24.  The algorithm section used to
be shorter, but people kept asking for qualifiers and more precision
in what they did and didn't do.  I'm really hesitant to shorten it
significantly given that it's as long as it is because people have
asked for it to be that long.  I don't really think 8 pages is that
long, do you?

>> I believe the authentication and CACHE-TIMEOUT mechanisms in the draft
>> are sufficient for preventing DoS, and there was consensus for that
>> the last time the change was made and presented a few meetings ago,
>> but welcome any further comments on the issue.
>
> Actually I have a comment there. The XOR-RESPONSE-TARGET attribute has a =
high potential for abuse, since it allows clients to instruct servers to se=
nd packets to arbitrary targets. I understand that requiring authentication=
 helps, but that leaves the door open for failures to implement authenticat=
ion properly in servers, or failures to secure credentials properly in clie=
nts. Again, I would be much more supportive if this attribute definition wa=
s removed from the draft.
>
> In fact, I believe that XOR-RESPONSE-TARGET is not needed. Most of the te=
sts can be performed using the CHANGE-ADDRESS attribute, which does not hav=
e the same potential for abuse. Besides, if you really want to send packets=
 from outside the local network towards arbitrary destinations, you can use=
 TURN.
>

It's not possible to do any lifetime or other timeout tests without
XOR-RESPONSE-TARGET.

The CACHE-TIMEOUT mechanism prevents the attack you describe.  It's
described at the beginning of Section 5 and in Section 7.8 among other
places.  Group consensus was that since there is no amplification
attack, Section 7.8 only gives SHOULD level to requiring the server to
only respond to XOR-RESPONSE-TARGET when there is a current cached
request for the target address, and rate-limits XOR-RESPONSE-TARGET
when CACHE-TIMEOUT is not used.  Obviously that decision is up for
debate, but there were conversations both on the mailing list and face
to face that led to the current text.

TURN is overkill for this application.

Bruce


> -- Christian Huitema
>
>
>
>

From brian.e.carpenter@gmail.com  Sun Apr  5 16:42:19 2009
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Date: Mon, 06 Apr 2009 11:43:17 +1200
From: Brian E Carpenter 
Organization: University of Auckland
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Cc: behave@ietf.org
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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On 2009-04-03 19:50, pierre.levis@orange-ftgroup.com wrote:
> Hi,
> 
> --------------------
> Quoted from draft-baker-behave-v4v6-framework-02:
> 
> 
> bits n..n+31  An embedded IPv4 address.  Except in the case of a 96
> bit prefix, this address intentionally straddles the boundary
> between [RFC4291]'s 64 bit "subnet" locator and its 64 bit host
> identifier.  The intention is that the /64 be used in routing and
> the bits in the host part be used for host identification as
> described in the address architecture.
> 
> 

...
> Do we have to address the conformity to Modified EUI-64 format for v4v6
> addresses?
> In particular the so-called UG bits?

Yes, I think we should.

> In that case, is it still possible to have an IPv4 embedded address that
> crosses the 64bit boundary?

I don't see why not, as long as we stuff the UG bits in at the
appropriate bit positions.

   Brian

From bbl@lowekamp.net  Sun Apr  5 19:56:22 2009
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From: Bruce Lowekamp 
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Bernard,

Thanks for the comments.  Let me see if I can describe a scenario in
which behavior-discovery is useful.

First, we don't want to "go back to 3489."  There were two problems
(well, there were a lot more problems, but I just want to talk about
two right now) in particular that we don't ever want to go back to:

- 3489 specified that an application would start up, characterize its
NAT, and work in that mode forever after
- 3489 specified that if you had a friendly NAT, you could query the
STUN server for your transport address and use that one address

At the same time, behavior-discovery is targeting applications for
which ICE doesn't necessarily make sense.  For example, applications
that don't want to fall back to TURN, but have other options for how
to establish a connection.   (whether this means indirect routing or
not needing the connection, or other reasons)

So let me try to go into more details on a potential P2P application.
When P2P node A starts up, it evaluates its NAT(s) relative to other
nodes already in the overlay.  Let's say that its testing indicates
it's behind a good NAT, with endpoint-independent mapping and
filtering.  In this case, the peer will join the overlay and establish
connections with appropriate peers in the overlay, but it will
advertise to any node in the overlay that wants to reach it that they
don't need to route through the overlay network formed by the P2P
nodes to reach it (which is the normal routing mode in a P2P overlay),
they can just send directly to its IP address.

So when node B wants to send a message to A, it sends the message
directly to A's IP address and starts a timer.  If it doesn't receive
a response within a certain amount of time, then it routes the message
to A across the overlay instead.  (Alternatively, B could
simultaneously send the message to A's IP address and across the
overlay, which guarantees minimum response latency, but can waste
bandwidth.)

A over time observes what percentage of the time it receives direct
messages compared to overlay messages. If the percentage of direct
connections is below some threshold (say 66%, picking a random number)
then may stop advertising for direct connections.  But if the
percentage is high enough, it continues to advertise because it may be
helping performance.  If at some point, the NAT changes its behavior,
A will notice a change in its direct connection percentage and may
re-evaluate its decision to advertise a public address.


(There are a lot of other details how this might work, how it would
deal with multiple levels of NATs, and what the actual cost benefits
are.  I don't want to get into all of the details of how it would work
here.)

This is a good example because behavior-discovery is used for initial
operating mode selection, but the actual decision for whether to
continue advertising that public IP/port pair is made based on actual
operating data.  It's also using the result of the behavior-discovery
work as an optimization, not in a manner where the application will
fail if a percentage of the nodes in the overlay are unable to make a
connection.

Bruce


On Sat, Apr 4, 2009 at 2:39 AM, Bernard Aboba  wrote:
> Bruce Lowekamp said:
>
> "Many of the questions you raise point to the same question of whether
> tests or techniques that are known to fail on a certain percentage of
> NATs under a certain percentage of operating conditions are
> nevertheless valuable.  behavior-discovery has an applicability
> statement
> http://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discovery-06#section-1
> that discusses those issues in some detail.  I spent enough time
> wording that statement and discussing it with various people that I
> think it is best to refer to that statement.
>
> You also repeatedly uses phrases such as "basically won't work" and
> "it might work."   The comes down to the value of "certain percentage"
> as used above.  My experience with these techniques, and the
> experience of those who have used such techniques recently, is that
> they are far more reliable than that, into the 90% range, particularly
> when used correctly.  That is not high enough that we could go back to
> 3489---all techniques require fallbacks because they fail, and 90% is
> far, far too low of a success rate---but it is high enough that
> applications can make useful decisions based on that information,
> provided they have a fallback in cases where the information is wrong.
> And those are the conditions of the experiment."
>
> What I am failing to understand is the distinction between those
> situations in which we "cannot go back to RFC 3489" and the scenarios
> envisaged for the experiment.
>
> Presumably, situations in which we "cannot go back to RFC 3489"
> include Internet telephony, which may be used for life-critical
> situations such as E911.  For those kind of scenarios, we need
> traversal technologies that are as reliable as possible, and are
> willing to live with the complexity of ICE to achieve this.
>
> The draft mentions P2P applications as one potential situation in
> which usage of imperfect techniques is acceptable, and yet the
> IETF currently has the P2PSIP WG, which is involved in the
> development of technology for usage of SIP over P2P networks.
> In that kind of application, wouldn't the reliability requirements
> be similar to those in which we "cannot go back to RFC 3489"?
>
> This lead me to think about the requirements for the diagnostic
> scenarios that are also discussed in the document.  In existing
> deployments it is often challenging to figure out the reasons
> why traversal is unsuccessful, and what can be done to improve
> the overall success rate.  Data suggests that there are even
> common situations in which ICE will fail.  But in thinking
> through how to approach diagnosis under those conditions,
> I'd currently be more inclined to start from the addition of
> diagnostics to an ICE implementation than to focus on the
> use of the diagnostic mechanisms described in the draft.
>
> So while I'm generally sympathetic to the idea that there
> are situations in which "less than perfect" techniques can
> be useful, in practice a number of common situations
> where NAT traversal is used today (such as life-critical
> Internet telephony) do not seem to fit into that bucket.
>
> It could be that I didn't quite understand the examples
> given in the applicability statement, or that I'm putting
> too much emphasis on corner conditions, because that is
> what customers tend to complain about.
>
> However, overall the document left me unclear about the
> rationale by which the material deprecated in RFC 3489
> was being re-introduced.   While it does seem possible
> to construct a rationale for this, the document doesn't
> provide enough background to get me over that hump.
>
>
>
>
>
>
> _______________________________________________
> Ietf mailing list
> Ietf@ietf.org
> https://www.ietf.org/mailman/listinfo/ietf
>
>

From iljitsch@muada.com  Mon Apr  6 09:34:00 2009
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From: Iljitsch van Beijnum 
To: Behave WG 
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Subject: [BEHAVE] NAT64 FTP ALG draft
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Hi all,

I wrote a short draft (just over 3 pages excluding boilerplate and  
references) about how an FTP ALG for a NAT64 translator should behave.

I tested 25 FTP servers, with the following results:

- 12 would do EPSV over IPv4
- 8 responded with a 50x error to the EPSV command
- 5 had significant delays and some even a control channel reset after  
EPSV
- only 2 indicate they support EPSV in answer to a FEAT command
- none of the servers had problems with PASV

Conclusion: assuming the clients issue EPSV, we can simply translate  
this to PASV, which doesn't require setting up any mappings in the  
NAT64. However, I don't know how IPv6 FTP clients behave. If anyone  
has any info on IPv6 FTP clients that don't support EPSV or try EPRT  
first, please let me know. Even better: if someone can log EPSV vs  
EPRT on a busy IPv6 FTP server, that would really help a lot.

So EPSV->PASV is a MUST if we want users to be able to talk to more  
than 48% of FTP servers. Additionally, it's not too troublesome to  
support EPRT->PORT translation. This requires setting up a mapping in  
the NAT64 based on what happens in the control channel. This is  
specified as a MAY in the draft, leaving the door open for limited  
compatibility with server-to-server FTP.

If we want to be really fancy we could support EPRT->PASV mapping, but  
this requires a good deal more trickery, such as the NAT64 setting up  
sessions to both the server and the client and then connecting those  
sessions. This means that the NAT64 must be able to translate sequence  
numbers because the client and server will each choose a sequence  
number that doesn't match the one previously chosen by the NAT64. I  
didn't specify this part.

Please let me know what you think.

Iljitsch

Begin forwarded message:

> From: Internet-Drafts@ietf.org
> Date: 6 april 2009 18:00:01 GMT+02:00
> To: i-d-announce@ietf.org
> Subject: I-D Action:draft-van-beijnum-behave-ftp64-00.txt
> Reply-To: internet-drafts@ietf.org
>
> A New Internet-Draft is available from the on-line Internet-Drafts  
> directories.
>
> 	Title           : FTP Application Layer Gateway for NAT64
> 	Author(s)       : I. van Beijnum
> 	Filename        : draft-van-beijnum-behave-ftp64-00.txt
> 	Pages           : 6
> 	Date            : 2009-04-06
>
> The only FTP mode that works without changes through an IPv6-to-IPv4
> translator is extended passive, introduced in 1998.  However, many
> existing FTP servers don't support this mode, making it impossible to
> support the File Transfer Protocol through an IPv6-to-IPv4 translator
> without an Application Layer Gateway.  This document describes the
> behavior of such an ALG.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-van-beijnum-behave-ftp64-00.txt


From bbl@lowekamp.net  Mon Apr  6 10:16:02 2009
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References:   
Date: Mon, 6 Apr 2009 13:17:05 -0400
Message-ID: 
From: Bruce Lowekamp 
To: Bernard Aboba 
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Yes, if having more of a sketch of an application that would satisfy
the experiment criteria would help, I can add more detail about this
possibility in the applicability section.

Bruce

On Mon, Apr 6, 2009 at 12:10 PM, Bernard Aboba
 wrote:
> Bruce --
>
> Thanks for the reply.=C2=A0 Your explanation provides some helpful backgr=
ound.
> Would you consider adding some of this material to the document?
>
>> Date: Sun, 5 Apr 2009 22:57:22 -0400
>> Subject: Re: Last Call: draft-ietf-behave-nat-behavior-discovery
>> (NATBehavior Discovery Using STUN) to Experimental RFC
>> From: bbl@lowekamp.net
>> To: bernard_aboba@hotmail.com
>> CC: ietf@ietf.org; behave@ietf.org
>>
>> Bernard,
>>
>> Thanks for the comments. Let me see if I can describe a scenario in
>> which behavior-discovery is useful.
>>
>> First, we don't want to "go back to 3489." There were two problems
>> (well, there were a lot more problems, but I just want to talk about
>> two right now) in particular that we don't ever want to go back to:
>>
>> - 3489 specified that an application would start up, characterize its
>> NAT, and work in that mode forever after
>> - 3489 specified that if you had a friendly NAT, you could query the
>> STUN server for your transport address and use that one address
>>
>> At the same time, behavior-discovery is targeting applications for
>> which ICE doesn't necessarily make sense. For example, applications
>> that don't want to fall back to TURN, but have other options for how
>> to establish a connection. (whether this means indirect routing or
>> not needing the connection, or other reasons)
>>
>> So let me try to go into more details on a potential P2P application.
>> When P2P node A starts up, it evaluates its NAT(s) relative to other
>> nodes already in the overlay. Let's say that its testing indicates
>> it's behind a good NAT, with endpoint-independent mapping and
>> filtering. In this case, the peer will join the overlay and establish
>> connections with appropriate peers in the overlay, but it will
>> advertise to any node in the overlay that wants to reach it that they
>> don't need to route through the overlay network formed by the P2P
>> nodes to reach it (which is the normal routing mode in a P2P overlay),
>> they can just send directly to its IP address.
>>
>> So when node B wants to send a message to A, it sends the message
>> directly to A's IP address and starts a timer. If it doesn't receive
>> a response within a certain amount of time, then it routes the message
>> to A across the overlay instead. (Alternatively, B could
>> simultaneously send the message to A's IP address and across the
>> overlay, which guarantees minimum response latency, but can waste
>> bandwidth.)
>>
>> A over time observes what percentage of the time it receives direct
>> messages compared to overlay messages. If the percentage of direct
>> connections is below some threshold (say 66%, picking a random number)
>> then may stop advertising for direct connections. But if the
>> percentage is high enough, it continues to advertise because it may be
>> helping performance. If at some point, the NAT changes its behavior,
>> A will notice a change in its direct connection percentage and may
>> re-evaluate its decision to advertise a public address.
>>
>>
>> (There are a lot of other details how this might work, how it would
>> deal with multiple levels of NATs, and what the actual cost benefits
>> are. I don't want to get into all of the details of how it would work
>> here.)
>>
>> This is a good example because behavior-discovery is used for initial
>> operating mode selection, but the actual decision for whether to
>> continue advertising that public IP/port pair is made based on actual
>> operating data. It's also using the result of the behavior-discovery
>> work as an optimization, not in a manner where the application will
>> fail if a percentage of the nodes in the overlay are unable to make a
>> connection.
>>
>> Bruce
>>
>>
>> On Sat, Apr 4, 2009 at 2:39 AM, Bernard Aboba 
>> wrote:
>> > Bruce Lowekamp said:
>> >
>> > "Many of the questions you raise point to the same question of whether
>> > tests or techniques that are known to fail on a certain percentage of
>> > NATs under a certain percentage of operating conditions are
>> > nevertheless valuable. behavior-discovery has an applicability
>> > statement
>> >
>> > http://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discovery-06=
#section-1
>> > that discusses those issues in some detail. I spent enough time
>> > wording that statement and discussing it with various people that I
>> > think it is best to refer to that statement.
>> >
>> > You also repeatedly uses phrases such as "basically won't work" and
>> > "it might work." The comes down to the value of "certain percentage"
>> > as used above. My experience with these techniques, and the
>> > experience of those who have used such techniques recently, is that
>> > they are far more reliable than that, into the 90% range, particularly
>> > when used correctly. That is not high enough that we could go back to
>> > 3489---all techniques require fallbacks because they fail, and 90% is
>> > far, far too low of a success rate---but it is high enough that
>> > applications can make useful decisions based on that information,
>> > provided they have a fallback in cases where the information is wrong.
>> > And those are the conditions of the experiment."
>> >
>> > What I am failing to understand is the distinction between those
>> > situations in which we "cannot go back to RFC 3489" and the scenarios
>> > envisaged for the experiment.
>> >
>> > Presumably, situations in which we "cannot go back to RFC 3489"
>> > include Internet telephony, which may be used for life-critical
>> > situations such as E911. For those kind of scenarios, we need
>> > traversal technologies that are as reliable as possible, and are
>> > willing to live with the complexity of ICE to achieve this.
>> >
>> > The draft mentions P2P applications as one potential situation in
>> > which usage of imperfect techniques is acceptable, and yet the
>> > IETF currently has the P2PSIP WG, which is involved in the
>> > development of technology for usage of SIP over P2P networks.
>> > In that kind of application, wouldn't the reliability requirements
>> > be similar to those in which we "cannot go back to RFC 3489"?
>> >
>> > This lead me to think about the requirements for the diagnostic
>> > scenarios that are also discussed in the document. In existing
>> > deployments it is often challenging to figure out the reasons
>> > why traversal is unsuccessful, and what can be done to improve
>> > the overall success rate. Data suggests that there are even
>> > common situations in which ICE will fail. But in thinking
>> > through how to approach diagnosis under those conditions,
>> > I'd currently be more inclined to start from the addition of
>> > diagnostics to an ICE implementation than to focus on the
>> > use of the diagnostic mechanisms described in the draft.
>> >
>> > So while I'm generally sympathetic to the idea that there
>> > are situations in which "less than perfect" techniques can
>> > be useful, in practice a number of common situations
>> > where NAT traversal is used today (such as life-critical
>> > Internet telephony) do not seem to fit into that bucket.
>> >
>> > It could be that I didn't quite understand the examples
>> > given in the applicability statement, or that I'm putting
>> > too much emphasis on corner conditions, because that is
>> > what customers tend to complain about.
>> >
>> > However, overall the document left me unclear about the
>> > rationale by which the material deprecated in RFC 3489
>> > was being re-introduced. While it does seem possible
>> > to construct a rationale for this, the document doesn't
>> > provide enough background to get me over that hump.
>> >
>> >
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Ietf mailing list
>> > Ietf@ietf.org
>> > https://www.ietf.org/mailman/listinfo/ietf
>> >
>> >
>

From rfc-editor@rfc-editor.org  Mon Apr  6 17:18:46 2009
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Subject: [BEHAVE] BCP 148, RFC 5508 on NAT Behavioral Requirements for ICMP
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A new Request for Comments is now available in online RFC libraries.

        BCP 148        
        RFC 5508

        Title:      NAT Behavioral Requirements for ICMP 
        Author:     P. Srisuresh, B. Ford,
                    S. Sivakumar, S. Guha
        Status:     Best Current Practice
        Date:       April 2009
        Mailbox:    srisuresh@yahoo.com, 
                    baford@mpi-sws.org, 
                    ssenthil@cisco.com,
                    saikat@cs.cornell.edu
        Pages:      29
        Characters: 67985
        See Also:   BCP0148

        I-D Tag:    draft-ietf-behave-nat-icmp-12.txt

        URL:        http://www.rfc-editor.org/rfc/rfc5508.txt

This document specifies the behavioral properties required of the
Network Address Translator (NAT) devices in conjunction with the
Internet Control Message Protocol (ICMP).  The objective of this
memo is to make NAT devices more predictable and compatible with
diverse application protocols that traverse the devices.  Companion
documents provide behavioral recommendations specific to TCP, UDP,
and other protocols.  This document specifies an Internet Best Current 
Practices for the Internet Community, and requests discussion and 
suggestions for improvements.

This document is a product of the Behavior Engineering for Hindrance Avoidance Working Group of the IETF.


BCP: This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for 
improvements. Distribution of this memo is unlimited.

This announcement is sent to the IETF-Announce and rfc-dist lists.
To subscribe or unsubscribe, see
  http://www.ietf.org/mailman/listinfo/ietf-announce
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Requests for special distribution should be addressed to either the
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specifically noted otherwise on the RFC itself, all RFCs are for
unlimited distribution.


The RFC Editor Team
USC/Information Sciences Institute



From pierre.levis@orange-ftgroup.com  Mon Apr  6 23:57:28 2009
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Yes, but that means routers will have to remove these two bits before =
processing the routing information. That can be pretty tricky, mainly if =
we allow LIR Prefixes whose length will vary from one provider to =
another (even if the UG bits are always at the same place).

Shouldn't this issue be mentionned in =
draft-baker-behave-v4v6-framework-02?


 Pierre

-----Message d'origine-----
De : behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] De la part =
de Brian E Carpenter
Envoy=E9 : lundi 6 avril 2009 01:43
=C0 : LEVIS Pierre RD-CORE-CAE
Cc : behave@ietf.org
Objet : Re: [BEHAVE] Question on embedded address format =
indraft-baker-behave-v4v6-framework-02

On 2009-04-03 19:50, pierre.levis@orange-ftgroup.com wrote:
> Hi,
>=20
> --------------------
> Quoted from draft-baker-behave-v4v6-framework-02:
>=20
>=20
> bits n..n+31  An embedded IPv4 address.  Except in the case of a 96
> bit prefix, this address intentionally straddles the boundary
> between [RFC4291]'s 64 bit "subnet" locator and its 64 bit host
> identifier.  The intention is that the /64 be used in routing and
> the bits in the host part be used for host identification as
> described in the address architecture.
>=20
>=20

...
> Do we have to address the conformity to Modified EUI-64 format for =
v4v6
> addresses?
> In particular the so-called UG bits?

Yes, I think we should.

> In that case, is it still possible to have an IPv4 embedded address =
that
> crosses the 64bit boundary?

I don't see why not, as long as we stuff the UG bits in at the
appropriate bit positions.


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From fred@cisco.com  Tue Apr  7 09:32:45 2009
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Cc: Xing Li , Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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On Apr 2, 2009, at 11:50 PM,   wrote:

> Do we have to address the conformity to Modified EUI-64 format for  
> v4v6 addresses? In particular the so-called UG bits? In that case,  
> is it still possible to have an IPv4 embedded address that crosses  
> the 64bit boundary? If we do not care, why does Teredo (which  
> includes two IPv4 addresses) care?

The CERNET prototype hasn't had any issues with ignoring them.

Section 2.5.1 of RFC 4291 goes to some lengths to say two things. The  
first is that an interface identifier has to be unique on the LAN-or- 
whatever it is on. The second is that when the interface identifier is  
a MAC address it should be in a format related to a MAC Address -  
except that it is different.

    Modified EUI-64 format-based interface identifiers may have  
universal
    scope when derived from a universal token (e.g., IEEE 802 48-bit MAC
    or IEEE EUI-64 identifiers [EUI64]) or may have local scope where a
    global token is not available (e.g., serial links, tunnel end- 
points)
    or where global tokens are undesirable (e.g., temporary tokens for
    privacy [PRIV]).

    Modified EUI-64 format interface identifiers are formed by inverting
    the "u" bit (universal/local bit in IEEE EUI-64 terminology) when
    forming the interface identifier from IEEE EUI-64 identifiers.  In
    the resulting Modified EUI-64 format, the "u" bit is set to one (1)
    to indicate universal scope, and it is set to zero (0) to indicate
    local scope.

So, especially given privacy addressing, we can't really assume that  
the router or neighboring host is going to extract a MAC address from  
the interface identifier and directly use it to direct a datagram to  
another host; rather, the relationship between a MAC address and an  
interface identifier has a level of indirection managed by Neighbor  
Discovery.

Given that the address architecture specifies the bits but only uses  
them to ensure that the interface identifier is not "all zeroes" and  
is unique, and in this context the addresses are in fact unique, my  
sense would be to ignore the question.

That said, the fact should probably be explained in the prefix document.

Other thoughts?

From iljitsch@muada.com  Tue Apr  7 14:10:40 2009
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On 7 apr 2009, at 18:33, Fred Baker wrote:

>> Do we have to address the conformity to Modified EUI-64 format for  
>> v4v6 addresses? In particular the so-called UG bits?

> The CERNET prototype hasn't had any issues with ignoring them.

There could still be trouble down the road, the point of  
specifications is that two or more people follow them.

> So, especially given privacy addressing, we can't really assume that  
> the router or neighboring host is going to extract a MAC address  
> from the interface identifier and directly use it to direct a  
> datagram to another host;

Right. But then, nobody is suggesting that.

> Given that the address architecture specifies the bits but only uses  
> them to ensure that the interface identifier is not "all zeroes" and  
> is unique, and in this context the addresses are in fact unique, my  
> sense would be to ignore the question.

What we lose in that case is the possibility of recognizing a certain  
class of addresses just by looking at the interface identifier. That  
is not something we have any use for today, but we might in the future.

By coincidence we ended up in the situation that it's as good as  
impossible to have an interface identifier with 11 in the two lower  
bits of the upper byte (u/l = unique, group = yes) because only  
stateless autoconfig and other eui-64 derived configuration set the u/ 
l bit to unique, but since it doesn't make sense to create a unicast  
network address from a multicast link address, the g bit is always 0  
in that case.

So if we ever find a use for being able to recognize a special class  
of interface identifiers we could use the unique/group combination for  
those and have only a minimal chance of clashing with other address  
types. It would be a shame to throw away this possibility without a  
good reason.

From philip_matthews@magma.ca  Tue Apr  7 20:45:59 2009
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[Added BEHAVE to the CC line]

Hi Robert:

See comments inline.

On Tue, 7-Apr-09, at 11:54 , Robert Sparks wrote:

> Discuss:
> In section 11.2, I'm not finding where it's explicitly specified  
> what the lifetime of a Permission established by a ChannelBind is. I  
> think both the server and client are expected to use the lifetime of  
> the ChannelBind as the lifetime of the Permission, but this should  
> be explicitly stated.

Actually, the lifetime of a Permission is the same (5 minutes) no  
matter how it is created. This is explained in section 8. To make this  
clearer, in section 11.1, when it says:

    A channel binding is created or refreshed using a ChannelBind
    transaction.  A ChannelBind transaction also creates or refreshes a
    permission towards the peer.

I have added a "(see section 8)" after "peer" to remind the reader to  
check section 8.

>
>
> ----
>
> The text defining how the lifetimes of permissions and allocations  
> are established say to use either the value requested by the client,  
> or the default lifetime (see the bottom of page 25, top of page 26  
> for example). The example shows the server choosing a value (20  
> minutes) between those. Was the intent of the normative text to  
> allow the server to choose any value between the default and  
> requested value, or only the endpoints?

Good catch! The normative text at bottom-25/top-26 does not clearly  
handle the case where the client asks for a lifetime greater than the  
maximum value the server will allow. The intention is to allow the  
server to reduce the client's requested lifetime to the maximum value  
that the server will allow, provided that the result is greater than  
the default lifetime. This is sort-of described in the text, but not  
very well.

To fix this, I have changed this paragraph to read as follows:

     The server determines the initial value of the time-to-expiry
     field as follows. If the request contains a LIFETIME attribute,
     then the server computes MIN(client's proposed lifetime, server's
     maximum allowed lifetime). If this computed lifetime is greater
     than the default lifetime, then the server uses that value.
     Otherwise, the server uses the default lifetime. It is RECOMMENDED
     that the server use a maximum allowed lifetime value of no more
     than 3600 seconds (1 hour). Servers that implement allocation
     quotas or charge users for allocations in some way may wish to
     use a smaller maximum allowed lifetime (perhaps as small as the
     default lifetime) to more quickly remove orphaned allocations
     (that is, allocations where the corresponding client has crashed
     or terminated or the client connection has been lost for some
     reason). Also note that the time-to-expiry is recomputed with
     each successful Refresh request, and thus the value computed here
     applies only until the first refresh.

I have also changed the text in section 7.2 (Receiving a Refresh  
Request), which was also unclear. This text now reads:

     The server computes a value called the "desired lifetime" as
     follows: If the request contains a LIFETIME attribute and the
     attribute value is 0, then the "desired lifetime" is 0. Otherwise,
     if the request contains a LIFETIME attribute, then the server
     computes MIN(client's requested lifetime, server's maximum allowed
     lifetime). If this computed value is greater than the default
     lifetime, then the "desired lifetime" is the computed value.
     Otherwise the "desired lifetime"  is the default lifetime.

Note that both of these paragraphs refer only to the lifetime of the  
Allocation. A permission lifetime cannot be changed by the client and  
is always 5 minutes. You may have gotten the idea that the lifetime of  
a permission was modifiable because the text in section 8 uses the  
term "default permission lifetime". To make this clearer, I have  
changed this term to "Permission Lifetime".

>
>
> ----
>
> I think there is an unintended problem in the way the processing for  
> Allocate requests is spelled out on pages 23 and 24. As written, a  
> request that contains both a RESERVATION-TOKEN and an EVEN-PORT  
> attribute that the server couldn't satisfy, step 5 will cause a 508  
> error (which will lead to the client trying the same request again).  
> The intended check to reject this with a 400 doesn't occur until  
> step 6.

Another good catch! To fix this, I have swapped the order of steps 5  
and 6. This will catch this case and return a 400 Bad Request, while  
not introducing an externally visible change when this error does not  
occur. (In fact, it makes more sense to check for RESERVATION-TOKEN  
before checking for EVEN-PORT). For consistency, I have also re- 
arranged the bullets describing how the server chooses the relayed- 
transport-address to put the RESERVATION-TOKEN case first.

>
>
> ----
>
> Should the text in 17.2.3 say that the TURN server will never accept  
> traffic from a peer which the client has not installed a permission  
> for, rather than which the client has not yet contacted?

Yes. I have changed this to say "from a peer for which the client has  
not installed a permission."

>
>
> Comment:
> There are several invariant times called out in this document  
> without motivation (default lifetimes MUST be 300 seconds, clients  
> SHOULD wait at least one minute before doing some things and MUST  
> wait 5 minutes before doing others). It would be nice to let the  
> implementors know, if possible, why these values were chosen.

I have added text in the Overview of Operation section to say:
* The default allocation lifetime of 10 minutes was chosen to be long  
enough not to be a burden to refresh, but short enough to expire  
allocations quickly when a client quits unexpectedly. This value can  
be increased on request by the client.
* The permission lifetime is 5 minutes and this value was chosen to be  
consistent with the recommended behavior of RFC4787.
* The channel lifetime permission is 10 minutes, and this value was  
chosen to be greater than the permission lifetime.

>
>
> The text in the NOTE on page 25 will not age well after this is  
> published as an RFC

This text was carefully crafted to call the reader's attention to the  
randomized port work without introducing another normative dependency  
that would further delaying TURN (and thus ICE, which has been sitting  
in the RFC Editor queue for 1.5 years now). The text was added as a  
result of a comment by a reviewer, who thought a TURN implementor  
should be aware of this work. Do you have a suggestion for an  
alternative wording that would age better?

- Philip




From philip_matthews@magma.ca  Tue Apr  7 21:02:44 2009
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On Sat, 4-Apr-09, at 16:09 , Russ Housley wrote:

> Discuss:
>
>  The IAB Considerations in RFC 3424 have not been changed, and it
>  is clear to me that TURN has an indefinite lifetime.  So, the first
>  two IAB UNSAF criteria cannot realistically be satisfied.  I do not
>  want to delay the document, but I do think it should include a
>  recognition of this conflict.  I'm happy with an IESG note or text
>  in the body of the document.
>

Actually, RFC 3424 only very tangentially applies to TURN, since TURN  
is just a protocol for controlling a relay. RFC 3424  applies to STUN  
and ICE much more directly.

Consideration 1 simply asks for a precise definition of the problem  
that TURN fixes, so I don't see what else can be said here.

However, Consideration 2 asks for an exit strategy or transition plan.  
Here I have changed the text of the response to Consideration 2 to read:

     Response: TURN will no longer be needed once there are no longer
     any NATs.  Unfortunately, as of the date of publication of this
     document, it no longer seems very likely that NATs will go away
     any time soon. However, the need for TURN will also decrease as
     the number of NATs with the mapping property of Endpoint- 
Independent
     Mapping [RFC4787] increases.

- Philip



From ebisawa@sablenetworks.net  Wed Apr  8 02:07:52 2009
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Hi Iljitsch,

Looks like I found a typo.

> 1.  Introduction
> 
>    [RFC0959] specifies two modes of operation for FTP: active mode, in
>    which the server connects back to the client on port 20 or a client-
>    provided port number, and active mode, where the server opens a port

should be : provided port number, and passive mode, where the server opens a port


Other part looks good to me.
(especially the way you suggest handling PASV/EPSV)

Thanks,
-- 
Kentaro Ebisawa 


On Mon, 6 Apr 2009 18:34:30 +0200
Iljitsch van Beijnum  wrote:

> Hi all,
> 
> I wrote a short draft (just over 3 pages excluding boilerplate and  
> references) about how an FTP ALG for a NAT64 translator should behave.
> 
> I tested 25 FTP servers, with the following results:
> 
> - 12 would do EPSV over IPv4
> - 8 responded with a 50x error to the EPSV command
> - 5 had significant delays and some even a control channel reset after  
> EPSV
> - only 2 indicate they support EPSV in answer to a FEAT command
> - none of the servers had problems with PASV
> 
> Conclusion: assuming the clients issue EPSV, we can simply translate  
> this to PASV, which doesn't require setting up any mappings in the  
> NAT64. However, I don't know how IPv6 FTP clients behave. If anyone  
> has any info on IPv6 FTP clients that don't support EPSV or try EPRT  
> first, please let me know. Even better: if someone can log EPSV vs  
> EPRT on a busy IPv6 FTP server, that would really help a lot.
> 
> So EPSV->PASV is a MUST if we want users to be able to talk to more  
> than 48% of FTP servers. Additionally, it's not too troublesome to  
> support EPRT->PORT translation. This requires setting up a mapping in  
> the NAT64 based on what happens in the control channel. This is  
> specified as a MAY in the draft, leaving the door open for limited  
> compatibility with server-to-server FTP.
> 
> If we want to be really fancy we could support EPRT->PASV mapping, but  
> this requires a good deal more trickery, such as the NAT64 setting up  
> sessions to both the server and the client and then connecting those  
> sessions. This means that the NAT64 must be able to translate sequence  
> numbers because the client and server will each choose a sequence  
> number that doesn't match the one previously chosen by the NAT64. I  
> didn't specify this part.
> 
> Please let me know what you think.
> 
> Iljitsch
> 
> Begin forwarded message:
> 
> > From: Internet-Drafts@ietf.org
> > Date: 6 april 2009 18:00:01 GMT+02:00
> > To: i-d-announce@ietf.org
> > Subject: I-D Action:draft-van-beijnum-behave-ftp64-00.txt
> > Reply-To: internet-drafts@ietf.org
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts  
> > directories.
> >
> > 	Title           : FTP Application Layer Gateway for NAT64
> > 	Author(s)       : I. van Beijnum
> > 	Filename        : draft-van-beijnum-behave-ftp64-00.txt
> > 	Pages           : 6
> > 	Date            : 2009-04-06
> >
> > The only FTP mode that works without changes through an IPv6-to-IPv4
> > translator is extended passive, introduced in 1998.  However, many
> > existing FTP servers don't support this mode, making it impossible to
> > support the File Transfer Protocol through an IPv6-to-IPv4 translator
> > without an Application Layer Gateway.  This document describes the
> > behavior of such an ALG.
> >
> > A URL for this Internet-Draft is:
> > http://www.ietf.org/internet-drafts/draft-van-beijnum-behave-ftp64-00.txt
> 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From remi.despres@free.fr  Wed Apr  8 02:49:17 2009
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Cc: Xing Li , "" , Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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Fred Baker  -  le (m/j/a) 4/7/09 6:33 PM:
> 
> On Apr 2, 2009, at 11:50 PM,  
>  wrote:
> 
>> Do we have to address the conformity to Modified EUI-64 format for 
>> v4v6 addresses? In particular the so-called UG bits? In that case, is 
>> it still possible to have an IPv4 embedded address that crosses the 
>> 64bit boundary? If we do not care, why does Teredo (which includes two 
>> IPv4 addresses) care?
> 
> The CERNET prototype hasn't had any issues with ignoring them.

> Other thoughts?

If I understand it right, distinguishing between EUI-64 and local-scope 
identifiers IS necessary where subnet prefixes are /64, but ONLY in this 
case.

A node outside a destination subnet is not expected to make any
assumption on the length of this subnet prefix.

Thus, extension of prefixes beyond /64 can be done freely, without
concern with a rule for links where subnet prefixes are /64.

As a matter of fact, this reasoning has been important to significantly 
simplify draft-despres-sam-xx between versions 01 and 02.

Regards,

RD



From philip_matthews@magma.ca  Wed Apr  8 04:59:12 2009
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Subject: [BEHAVE] TURN: Make Security a MUST for servers?
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At present, the TURN spec says:
* a server SHOULD use the Long-Term Credential mechanism, and
* a client MUST be prepared to use the mechanism if the server  
requires it.

One thing that has come up in the IESG review of TURN is the question  
of whether the SHOULD for servers should be changed to a MUST. The  
motivation is that TURN typically has terrible security if the Long- 
Term Credential mechanism is not used.

Right now, I see two occasions where a server might not want to use  
the Long-Term Credential mechanism:
1) If the client is using TLS transport between the client and the  
server, and if the server has some way to confirm that the client is  
authorized to use the server (or if the server doesn't care);
2) In special environments, where security is not an issue (for  
example, inside a corporate environment, where TURN is being used to  
work through an internal NAT).

Can anyone think of any other cases?

Comments on this topic? How do people feel about it?

What have various implementors done? Has everyone implemented the Long- 
Term Credential mechanism on the client side? On the server side?

- Philip

From simon.perreault@viagenie.ca  Wed Apr  8 05:08:13 2009
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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Philip Matthews wrote, On 04/08/2009 08:00 AM:
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
[...]
> 2) In special environments, [...]

This is exactly what SHOULD means: it's a MUST with an exception for special
environments.

> What have various implementors done? Has everyone implemented the
> Long-Term Credential mechanism on the client side? On the server side?

For our public server (http://numb.viagenie.ca), LTC is definitely a MUST.

I can envision many cases where LTC is needed, just as I can envision many other
cases where it is not.

I see no problem with keeping it a SHOULD.

Simon
-- 
STUN/TURN server    --> http://numb.viagenie.ca
Interplanetary news --> http://reeves.viagenie.ca
vCard 4.0           --> http://www.vcarddav.org

From vincent@clarinet.u-strasbg.fr  Wed Apr  8 05:19:32 2009
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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Philip Matthews a écrit :
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server 
> requires it.
>
> One thing that has come up in the IESG review of TURN is the question 
> of whether the SHOULD for servers should be changed to a MUST. The 
> motivation is that TURN typically has terrible security if the 
> Long-Term Credential mechanism is not used.
>
> Right now, I see two occasions where a server might not want to use 
> the Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the 
> server, and if the server has some way to confirm that the client is 
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for 
> example, inside a corporate environment, where TURN is being used to 
> work through an internal NAT).
>
> Can anyone think of any other cases?
>
> Comments on this topic? How do people feel about it?
>
> What have various implementors done? Has everyone implemented the 
> Long-Term Credential mechanism on the client side? On the server side?

Long-term credentials is a MUST for TurnServer project 
(http://www.turnserver.org).

--
Sebastien Vincent

>
> - Philip
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>


From moore@network-heretics.com  Wed Apr  8 05:26:32 2009
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IMHO, server _support_ for some sort of authentication mechanism is a
MUST.  I'm not sure whether it's reasonable to insist that it be the
Long-Term Credential mechanism, but you do need to make sure that
clients and servers have a way of interoperating securely.

Whether servers require it is an operational choice.  However, running
any kind of unauthenticated packet laundering service would generally be
 considered bad behavior.

I have a hard time buying the "special environments" exemption because
(a) it's ridiculous to assume that there are no threats within an
enterprise network of any significant size (yes I realize this is a
common assumption), and (b) this kind of service would be extremely
useful to a malicious process operating from within an enterprise network.

Keith


> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server requires it.
> 
> One thing that has come up in the IESG review of TURN is the question of
> whether the SHOULD for servers should be changed to a MUST. The
> motivation is that TURN typically has terrible security if the Long-Term
> Credential mechanism is not used.
> 
> Right now, I see two occasions where a server might not want to use the
> Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the
> server, and if the server has some way to confirm that the client is
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for example,
> inside a corporate environment, where TURN is being used to work through
> an internal NAT).
> 
> Can anyone think of any other cases?
> 
> Comments on this topic? How do people feel about it?
> 
> What have various implementors done? Has everyone implemented the
> Long-Term Credential mechanism on the client side? On the server side?
> 
> - Philip
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From joelja@bogus.com  Wed Apr  8 05:49:58 2009
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Philip Matthews wrote:
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server requires it.
> 
> One thing that has come up in the IESG review of TURN is the question of
> whether the SHOULD for servers should be changed to a MUST. The
> motivation is that TURN typically has terrible security if the Long-Term
> Credential mechanism is not used.
> 
> Right now, I see two occasions where a server might not want to use the
> Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the
> server, and if the server has some way to confirm that the client is
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for example,
> inside a corporate environment, where TURN is being used to work through
> an internal NAT).

Operationally I don't think of corprate environments as a place where
security is not an issue, precisely the opposite in fact given turn's
applications in such an environment.

> Can anyone think of any other cases?
> 
> Comments on this topic? How do people feel about it?
> 
> What have various implementors done? Has everyone implemented the
> Long-Term Credential mechanism on the client side? On the server side?
> 
> - Philip
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
> 

From marc.blanchet@viagenie.ca  Wed Apr  8 05:54:23 2009
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- I think we are going in the wrong track here.
- The question is not if corp environments need security or not.
- the question is if in some environments (such as corp), there is a
need to _not_ use Long-Term Credential of a turn server.

I agree that it should be a "SHOULD". i.e.: you should implement it, but
it might be not used in some networks. I see an option in the server
config to control that behavior...

Marc.

Joel Jaeggli a écrit :
> 
> Philip Matthews wrote:
>> At present, the TURN spec says:
>> * a server SHOULD use the Long-Term Credential mechanism, and
>> * a client MUST be prepared to use the mechanism if the server requires it.
>>
>> One thing that has come up in the IESG review of TURN is the question of
>> whether the SHOULD for servers should be changed to a MUST. The
>> motivation is that TURN typically has terrible security if the Long-Term
>> Credential mechanism is not used.
>>
>> Right now, I see two occasions where a server might not want to use the
>> Long-Term Credential mechanism:
>> 1) If the client is using TLS transport between the client and the
>> server, and if the server has some way to confirm that the client is
>> authorized to use the server (or if the server doesn't care);
>> 2) In special environments, where security is not an issue (for example,
>> inside a corporate environment, where TURN is being used to work through
>> an internal NAT).
> 
> Operationally I don't think of corprate environments as a place where
> security is not an issue, precisely the opposite in fact given turn's
> applications in such an environment.
> 
>> Can anyone think of any other cases?
>>
>> Comments on this topic? How do people feel about it?
>>
>> What have various implementors done? Has everyone implemented the
>> Long-Term Credential mechanism on the client side? On the server side?
>>
>> - Philip
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


-- 
=========
IPv6 book: Migrating to IPv6, Wiley. http://www.ipv6book.ca
Stun/Turn server for VoIP NAT-FW traversal: http://numb.viagenie.ca
DTN news service: http://reeves.viagenie.ca


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From: Scott Godin 
To: Marc Blanchet 
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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I agree.  I think MUST is fine.  reTurn will implements a configuration
option for this.
Scott Godin

On Wed, Apr 8, 2009 at 8:55 AM, Marc Blanchet wr=
ote:

> - I think we are going in the wrong track here.
> - The question is not if corp environments need security or not.
> - the question is if in some environments (such as corp), there is a
> need to _not_ use Long-Term Credential of a turn server.
>
> I agree that it should be a "SHOULD". i.e.: you should implement it, but
> it might be not used in some networks. I see an option in the server
> config to control that behavior...
>
> Marc.
>
> Joel Jaeggli a =E9crit :
> >
> > Philip Matthews wrote:
> >> At present, the TURN spec says:
> >> * a server SHOULD use the Long-Term Credential mechanism, and
> >> * a client MUST be prepared to use the mechanism if the server require=
s
> it.
> >>
> >> One thing that has come up in the IESG review of TURN is the question =
of
> >> whether the SHOULD for servers should be changed to a MUST. The
> >> motivation is that TURN typically has terrible security if the Long-Te=
rm
> >> Credential mechanism is not used.
> >>
> >> Right now, I see two occasions where a server might not want to use th=
e
> >> Long-Term Credential mechanism:
> >> 1) If the client is using TLS transport between the client and the
> >> server, and if the server has some way to confirm that the client is
> >> authorized to use the server (or if the server doesn't care);
> >> 2) In special environments, where security is not an issue (for exampl=
e,
> >> inside a corporate environment, where TURN is being used to work throu=
gh
> >> an internal NAT).
> >
> > Operationally I don't think of corprate environments as a place where
> > security is not an issue, precisely the opposite in fact given turn's
> > applications in such an environment.
> >
> >> Can anyone think of any other cases?
> >>
> >> Comments on this topic? How do people feel about it?
> >>
> >> What have various implementors done? Has everyone implemented the
> >> Long-Term Credential mechanism on the client side? On the server side?
> >>
> >> - Philip
> >> _______________________________________________
> >> Behave mailing list
> >> Behave@ietf.org
> >> https://www.ietf.org/mailman/listinfo/behave
> >>
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
>
>
> --
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> IPv6 book: Migrating to IPv6, Wiley. http://www.ipv6book.ca
> Stun/Turn server for VoIP NAT-FW traversal: http://numb.viagenie.ca
> DTN news service: http://reeves.viagenie.ca
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>

--0016e646033c36936004670adfdb
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I agree. =A0I think MUST is fine. =A0reTurn will implements a configuration=
 option for this.

Scott Godin

On Wed, Apr 8, 2009 at 8:55 AM, Marc Blanchet <=
;marc.blanchet@viagenie.ca=
> wrote:


- I think we are going in the wrong track h=
ere.

- The question is not if corp environments need security or not.

- the question is if in some environments (such as corp), there is a

need to _not_ use Long-Term Credential of a turn server.



I agree that it should be a "SHOULD". i.e.: you should implement =
it, but

it might be not used in some networks. I see an option in the server

config to control that behavior...



Marc.



Joel Jaeggli a =E9crit :


>

> Philip Matthews wrote:

>> At present, the TURN spec says:

>> * a server SHOULD use the Long-Term Credential mechanism, and

>> * a client MUST be prepared to use the mechanism if the server req=
uires it.

>>

>> One thing that has come up in the IESG review of TURN is the quest=
ion of

>> whether the SHOULD for servers should be changed to a MUST. The
>> motivation is that TURN typically has terrible security if the Lon=
g-Term

>> Credential mechanism is not used.

>>

>> Right now, I see two occasions where a server might not want to us=
e the

>> Long-Term Credential mechanism:

>> 1) If the client is using TLS transport between the client and the=


>> server, and if the server has some way to confirm that the client =
is

>> authorized to use the server (or if the server doesn't care);<=
br>
>> 2) In special environments, where security is not an issue (for ex=
ample,

>> inside a corporate environment, where TURN is being used to work t=
hrough

>> an internal NAT).

>

> Operationally I don't think of corprate environments as a place wh=
ere

> security is not an issue, precisely the opposite in fact given turn=
9;s

> applications in such an environment.

>

>> Can anyone think of any other cases?

>>

>> Comments on this topic? How do people feel about it?

>>

>> What have various implementors done? Has everyone implemented the<=
br>
>> Long-Term Credential mechanism on the client side? On the server s=
ide?

>>

>> - Philip

>> _______________________________________________

>> Behave mailing list

>> Behave@ietf.org

>> https://www.ietf.org/mailman/listinfo/behave

>>

> _______________________________________________

> Behave mailing list

> Behave@ietf.org

> https://www.ietf.org/mailman/listinfo/behave






--

=3D=3D=3D=3D=3D=3D=3D=3D=3D

IPv6 book: Migrating to IPv6, Wiley. http://www.ipv6book.ca

Stun/Turn server for VoIP NAT-FW traversal: http://numb.viagenie.ca

DTN news service: h=
ttp://reeves.viagenie.ca




_______________________________________________

Behave mailing list

Behave@ietf.org

=
https://www.ietf.org/mailman/listinfo/behave





--0016e646033c36936004670adfdb--

From petithug@acm.org  Wed Apr  8 08:20:49 2009
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Philip Matthews wrote:
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server requires it.
> 
> One thing that has come up in the IESG review of TURN is the question of
> whether the SHOULD for servers should be changed to a MUST. The
> motivation is that TURN typically has terrible security if the Long-Term
> Credential mechanism is not used.
> 
> Right now, I see two occasions where a server might not want to use the
> Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the
> server, and if the server has some way to confirm that the client is
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for example,
> inside a corporate environment, where TURN is being used to work through
> an internal NAT).
> 
> Can anyone think of any other cases?
> 
> Comments on this topic? How do people feel about it?

I think TURN server MUST authenticate and SHOULD use LTC.  Client
MUST support LTC.

> 
> What have various implementors done? Has everyone implemented the
> Long-Term Credential mechanism on the client side? On the server side?

LTC is a MUST in my server implementation and is implemented in our
two client implementations.

-- 
Marc Petit-Huguenin
Home: marc@petit-huguenin.org
Work: petithug@acm.org

From matthew@matthew.at  Wed Apr  8 08:42:38 2009
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Philip Matthews wrote:
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server 
> requires it.
>
> One thing that has come up in the IESG review of TURN is the question 
> of whether the SHOULD for servers should be changed to a MUST. The 
> motivation is that TURN typically has terrible security if the 
> Long-Term Credential mechanism is not used.
>
> Right now, I see two occasions where a server might not want to use 
> the Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the 
> server, and if the server has some way to confirm that the client is 
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for 
> example, inside a corporate environment, where TURN is being used to 
> work through an internal NAT).
>
> Can anyone think of any other cases?
>
Case #2 is the case I care about.
> Comments on this topic? How do people feel about it?
>
I believe that SHOULD is appropriate.
> What have various implementors done? Has everyone implemented the 
> Long-Term Credential mechanism on the client side? On the server side?
>
Adobe Flash Player 10.0 (installed on over 55% of all Internet-connected 
personal computers as of December 2008, the last month for which I can 
talk about statistics) implements TURN draft-08 WITHOUT long-term 
credentials.

This was done at the request of IT departments which wish to enable 
Flash Player's UDP-based RTMFP protocol without opening their firewall 
to all UDP traffic. This permits them to separately manage that traffic 
and log usage, just like an HTTP proxy does. And like their HTTP proxy, 
they don't particularly care about individual user authentication. They 
know that things like 802.1X, tight control over system software 
installation, and the ability to terminate people who don't comply with 
IT policies means that they have sufficient controls over how the 
internal network is used and how it connects to the Internet. Requiring 
configuration of individual credentials would be an impediment to 
deployment.

The most common request is for DHCP-based or similar autodiscovery of 
the proxy, and it would be even more difficult to add this while 
requiring individual clients to authenticate. (Where would they 
automatically get their credentials from?)

More recent TURN drafts have made TURN less efficient and more difficult 
to implement for use with a protocol that operates as RTMFP does 
(specifically, the requirement to allocate individual bindings prior to 
use, which conflicts with a protocol which wishes to send a flurry of 
single packets to candidate destination addresses at session startup, 
most of which will never be used again), and adding Long-Term Credential 
as a MUST could very well be the "straw that breaks the camel's back" 
and force a change to a proprietary proxy protocol.

The above is my personal opinion, not an official corporate position and 
this message is sent from my personal email account.

Matthew Kaufman



From taddyhatty@nifty.com  Mon Apr  6 08:12:43 2009
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From: "Tadayuki Abraham HATTORI" 
To: "Bruce Lowekamp" , "Bernard Aboba" 
References:  
Date: Tue, 7 Apr 2009 00:13:33 +0900
Organization: TaddyHatty
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Cc: behave@ietf.org, ietf@ietf.org
Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Dear experts,

Essentially, P2P application should be considered as a kind of invention of 
social science.
The role and the location of people and the related basis should be 
scientifically
defined within the technical specification. In addition to, the 
specification should be
proposed to neighborhood and our each local congress, parliament or diet.
Even if it includes military aspects.

The bell then beating one - Look where the ghost of traditional rigid 
computer come again.

TaddyHatty

>
>
> Bernard,
>
> Thanks for the comments.  Let me see if I can describe a scenario in
> which behavior-discovery is useful.
>
> First, we don't want to "go back to 3489."  There were two problems
> (well, there were a lot more problems, but I just want to talk about
> two right now) in particular that we don't ever want to go back to:
>
> - 3489 specified that an application would start up, characterize its
> NAT, and work in that mode forever after
> - 3489 specified that if you had a friendly NAT, you could query the
> STUN server for your transport address and use that one address
>
> At the same time, behavior-discovery is targeting applications for
> which ICE doesn't necessarily make sense.  For example, applications
> that don't want to fall back to TURN, but have other options for how
> to establish a connection.   (whether this means indirect routing or
> not needing the connection, or other reasons)
>
> So let me try to go into more details on a potential P2P application.
> When P2P node A starts up, it evaluates its NAT(s) relative to other
> nodes already in the overlay.  Let's say that its testing indicates
> it's behind a good NAT, with endpoint-independent mapping and
> filtering.  In this case, the peer will join the overlay and establish
> connections with appropriate peers in the overlay, but it will
> advertise to any node in the overlay that wants to reach it that they
> don't need to route through the overlay network formed by the P2P
> nodes to reach it (which is the normal routing mode in a P2P overlay),
> they can just send directly to its IP address.
>
> So when node B wants to send a message to A, it sends the message
> directly to A's IP address and starts a timer.  If it doesn't receive
> a response within a certain amount of time, then it routes the message
> to A across the overlay instead.  (Alternatively, B could
> simultaneously send the message to A's IP address and across the
> overlay, which guarantees minimum response latency, but can waste
> bandwidth.)
>
> A over time observes what percentage of the time it receives direct
> messages compared to overlay messages. If the percentage of direct
> connections is below some threshold (say 66%, picking a random number)
> then may stop advertising for direct connections.  But if the
> percentage is high enough, it continues to advertise because it may be
> helping performance.  If at some point, the NAT changes its behavior,
> A will notice a change in its direct connection percentage and may
> re-evaluate its decision to advertise a public address.
>
>
> (There are a lot of other details how this might work, how it would
> deal with multiple levels of NATs, and what the actual cost benefits
> are.  I don't want to get into all of the details of how it would work
> here.)
>
> This is a good example because behavior-discovery is used for initial
> operating mode selection, but the actual decision for whether to
> continue advertising that public IP/port pair is made based on actual
> operating data.  It's also using the result of the behavior-discovery
> work as an optimization, not in a manner where the application will
> fail if a percentage of the nodes in the overlay are unable to make a
> connection.
>
> Bruce
>
>
> On Sat, Apr 4, 2009 at 2:39 AM, Bernard Aboba  
> wrote:
>> Bruce Lowekamp said:
>>
>> "Many of the questions you raise point to the same question of whether
>> tests or techniques that are known to fail on a certain percentage of
>> NATs under a certain percentage of operating conditions are
>> nevertheless valuable.  behavior-discovery has an applicability
>> statement
>> http://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discovery-06#section-1
>> that discusses those issues in some detail.  I spent enough time
>> wording that statement and discussing it with various people that I
>> think it is best to refer to that statement.
>>
>> You also repeatedly uses phrases such as "basically won't work" and
>> "it might work."   The comes down to the value of "certain percentage"
>> as used above.  My experience with these techniques, and the
>> experience of those who have used such techniques recently, is that
>> they are far more reliable than that, into the 90% range, particularly
>> when used correctly.  That is not high enough that we could go back to
>> 3489---all techniques require fallbacks because they fail, and 90% is
>> far, far too low of a success rate---but it is high enough that
>> applications can make useful decisions based on that information,
>> provided they have a fallback in cases where the information is wrong.
>> And those are the conditions of the experiment."
>>
>> What I am failing to understand is the distinction between those
>> situations in which we "cannot go back to RFC 3489" and the scenarios
>> envisaged for the experiment.
>>
>> Presumably, situations in which we "cannot go back to RFC 3489"
>> include Internet telephony, which may be used for life-critical
>> situations such as E911.  For those kind of scenarios, we need
>> traversal technologies that are as reliable as possible, and are
>> willing to live with the complexity of ICE to achieve this.
>>
>> The draft mentions P2P applications as one potential situation in
>> which usage of imperfect techniques is acceptable, and yet the
>> IETF currently has the P2PSIP WG, which is involved in the
>> development of technology for usage of SIP over P2P networks.
>> In that kind of application, wouldn't the reliability requirements
>> be similar to those in which we "cannot go back to RFC 3489"?
>>
>> This lead me to think about the requirements for the diagnostic
>> scenarios that are also discussed in the document.  In existing
>> deployments it is often challenging to figure out the reasons
>> why traversal is unsuccessful, and what can be done to improve
>> the overall success rate.  Data suggests that there are even
>> common situations in which ICE will fail.  But in thinking
>> through how to approach diagnosis under those conditions,
>> I'd currently be more inclined to start from the addition of
>> diagnostics to an ICE implementation than to focus on the
>> use of the diagnostic mechanisms described in the draft.
>>
>> So while I'm generally sympathetic to the idea that there
>> are situations in which "less than perfect" techniques can
>> be useful, in practice a number of common situations
>> where NAT traversal is used today (such as life-critical
>> Internet telephony) do not seem to fit into that bucket.
>>
>> It could be that I didn't quite understand the examples
>> given in the applicability statement, or that I'm putting
>> too much emphasis on corner conditions, because that is
>> what customers tend to complain about.
>>
>> However, overall the document left me unclear about the
>> rationale by which the material deprecated in RFC 3489
>> was being re-introduced.   While it does seem possible
>> to construct a rationale for this, the document doesn't
>> provide enough background to get me over that hump.
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Ietf mailing list
>> Ietf@ietf.org
>> https://www.ietf.org/mailman/listinfo/ietf
>>
>>
> _______________________________________________
> Ietf mailing list
> Ietf@ietf.org
> https://www.ietf.org/mailman/listinfo/ietf 


From bernard_aboba@hotmail.com  Mon Apr  6 09:09:18 2009
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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Bruce --

Thanks for the reply.  Your explanation provides some helpful background.=20
Would you consider adding some of this material to the document?=20

> Date: Sun=2C 5 Apr 2009 22:57:22 -0400
> Subject: Re: Last Call: draft-ietf-behave-nat-behavior-discovery (NATBeha=
vior 	Discovery Using STUN) to Experimental RFC
> From: bbl@lowekamp.net
> To: bernard_aboba@hotmail.com
> CC: ietf@ietf.org=3B behave@ietf.org
>=20
> Bernard=2C
>=20
> Thanks for the comments.  Let me see if I can describe a scenario in
> which behavior-discovery is useful.
>=20
> First=2C we don't want to "go back to 3489."  There were two problems
> (well=2C there were a lot more problems=2C but I just want to talk about
> two right now) in particular that we don't ever want to go back to:
>=20
> - 3489 specified that an application would start up=2C characterize its
> NAT=2C and work in that mode forever after
> - 3489 specified that if you had a friendly NAT=2C you could query the
> STUN server for your transport address and use that one address
>=20
> At the same time=2C behavior-discovery is targeting applications for
> which ICE doesn't necessarily make sense.  For example=2C applications
> that don't want to fall back to TURN=2C but have other options for how
> to establish a connection.   (whether this means indirect routing or
> not needing the connection=2C or other reasons)
>=20
> So let me try to go into more details on a potential P2P application.
> When P2P node A starts up=2C it evaluates its NAT(s) relative to other
> nodes already in the overlay.  Let's say that its testing indicates
> it's behind a good NAT=2C with endpoint-independent mapping and
> filtering.  In this case=2C the peer will join the overlay and establish
> connections with appropriate peers in the overlay=2C but it will
> advertise to any node in the overlay that wants to reach it that they
> don't need to route through the overlay network formed by the P2P
> nodes to reach it (which is the normal routing mode in a P2P overlay)=2C
> they can just send directly to its IP address.
>=20
> So when node B wants to send a message to A=2C it sends the message
> directly to A's IP address and starts a timer.  If it doesn't receive
> a response within a certain amount of time=2C then it routes the message
> to A across the overlay instead.  (Alternatively=2C B could
> simultaneously send the message to A's IP address and across the
> overlay=2C which guarantees minimum response latency=2C but can waste
> bandwidth.)
>=20
> A over time observes what percentage of the time it receives direct
> messages compared to overlay messages. If the percentage of direct
> connections is below some threshold (say 66%=2C picking a random number)
> then may stop advertising for direct connections.  But if the
> percentage is high enough=2C it continues to advertise because it may be
> helping performance.  If at some point=2C the NAT changes its behavior=2C
> A will notice a change in its direct connection percentage and may
> re-evaluate its decision to advertise a public address.
>=20
>=20
> (There are a lot of other details how this might work=2C how it would
> deal with multiple levels of NATs=2C and what the actual cost benefits
> are.  I don't want to get into all of the details of how it would work
> here.)
>=20
> This is a good example because behavior-discovery is used for initial
> operating mode selection=2C but the actual decision for whether to
> continue advertising that public IP/port pair is made based on actual
> operating data.  It's also using the result of the behavior-discovery
> work as an optimization=2C not in a manner where the application will
> fail if a percentage of the nodes in the overlay are unable to make a
> connection.
>=20
> Bruce
>=20
>=20
> On Sat=2C Apr 4=2C 2009 at 2:39 AM=2C Bernard Aboba  wrote:
> > Bruce Lowekamp said:
> >
> > "Many of the questions you raise point to the same question of whether
> > tests or techniques that are known to fail on a certain percentage of
> > NATs under a certain percentage of operating conditions are
> > nevertheless valuable.  behavior-discovery has an applicability
> > statement
> > http://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discovery-06#=
section-1
> > that discusses those issues in some detail.  I spent enough time
> > wording that statement and discussing it with various people that I
> > think it is best to refer to that statement.
> >
> > You also repeatedly uses phrases such as "basically won't work" and
> > "it might work."   The comes down to the value of "certain percentage"
> > as used above.  My experience with these techniques=2C and the
> > experience of those who have used such techniques recently=2C is that
> > they are far more reliable than that=2C into the 90% range=2C particula=
rly
> > when used correctly.  That is not high enough that we could go back to
> > 3489---all techniques require fallbacks because they fail=2C and 90% is
> > far=2C far too low of a success rate---but it is high enough that
> > applications can make useful decisions based on that information=2C
> > provided they have a fallback in cases where the information is wrong.
> > And those are the conditions of the experiment."
> >
> > What I am failing to understand is the distinction between those
> > situations in which we "cannot go back to RFC 3489" and the scenarios
> > envisaged for the experiment.
> >
> > Presumably=2C situations in which we "cannot go back to RFC 3489"
> > include Internet telephony=2C which may be used for life-critical
> > situations such as E911.  For those kind of scenarios=2C we need
> > traversal technologies that are as reliable as possible=2C and are
> > willing to live with the complexity of ICE to achieve this.
> >
> > The draft mentions P2P applications as one potential situation in
> > which usage of imperfect techniques is acceptable=2C and yet the
> > IETF currently has the P2PSIP WG=2C which is involved in the
> > development of technology for usage of SIP over P2P networks.
> > In that kind of application=2C wouldn't the reliability requirements
> > be similar to those in which we "cannot go back to RFC 3489"?
> >
> > This lead me to think about the requirements for the diagnostic
> > scenarios that are also discussed in the document.  In existing
> > deployments it is often challenging to figure out the reasons
> > why traversal is unsuccessful=2C and what can be done to improve
> > the overall success rate.  Data suggests that there are even
> > common situations in which ICE will fail.  But in thinking
> > through how to approach diagnosis under those conditions=2C
> > I'd currently be more inclined to start from the addition of
> > diagnostics to an ICE implementation than to focus on the
> > use of the diagnostic mechanisms described in the draft.
> >
> > So while I'm generally sympathetic to the idea that there
> > are situations in which "less than perfect" techniques can
> > be useful=2C in practice a number of common situations
> > where NAT traversal is used today (such as life-critical
> > Internet telephony) do not seem to fit into that bucket.
> >
> > It could be that I didn't quite understand the examples
> > given in the applicability statement=2C or that I'm putting
> > too much emphasis on corner conditions=2C because that is
> > what customers tend to complain about.
> >
> > However=2C overall the document left me unclear about the
> > rationale by which the material deprecated in RFC 3489
> > was being re-introduced.   While it does seem possible
> > to construct a rationale for this=2C the document doesn't
> > provide enough background to get me over that hump.
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > Ietf mailing list
> > Ietf@ietf.org
> > https://www.ietf.org/mailman/listinfo/ietf
> >
> >

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Bruce --

Thanks for the reply. =3B Your explanation provides som=
e helpful background. 
Would you consider adding some of this material t=
o the document? 

>=3B Date: Sun=2C 5 Apr 2009 22:57:22 -0400
&g=
t=3B Subject: Re: Last Call: draft-ietf-behave-nat-behavior-discovery (NATB=
ehavior 	Discovery Using STUN) to Experimental RFC
>=3B From: bbl@lowe=
kamp.net
>=3B To: bernard_aboba@hotmail.com
>=3B CC: ietf@ietf.or=
g=3B behave@ietf.org
>=3B 
>=3B Bernard=2C
>=3B 
>=3B T=
hanks for the comments.  Let me see if I can describe a scenario in
>=
=3B which behavior-discovery is useful.
>=3B 
>=3B First=2C we do=
n't want to "go back to 3489."  There were two problems
>=3B (well=2C =
there were a lot more problems=2C but I just want to talk about
>=3B t=
wo right now) in particular that we don't ever want to go back to:
>=
=3B 
>=3B - 3489 specified that an application would start up=2C chara=
cterize its
>=3B NAT=2C and work in that mode forever after
>=3B =
- 3489 specified that if you had a friendly NAT=2C you could query the
&=
gt=3B STUN server for your transport address and use that one address
&g=
t=3B 
>=3B At the same time=2C behavior-discovery is targeting applica=
tions for
>=3B which ICE doesn't necessarily make sense.  For example=
=2C applications
>=3B that don't want to fall back to TURN=2C but have=
 other options for how
>=3B to establish a connection.   (whether this=
 means indirect routing or
>=3B not needing the connection=2C or other=
 reasons)
>=3B 
>=3B So let me try to go into more details on a p=
otential P2P application.
>=3B When P2P node A starts up=2C it evaluat=
es its NAT(s) relative to other
>=3B nodes already in the overlay.  Le=
t's say that its testing indicates
>=3B it's behind a good NAT=2C with=
 endpoint-independent mapping and
>=3B filtering.  In this case=2C the=
 peer will join the overlay and establish
>=3B connections with approp=
riate peers in the overlay=2C but it will
>=3B advertise to any node i=
n the overlay that wants to reach it that they
>=3B don't need to rout=
e through the overlay network formed by the P2P
>=3B nodes to reach it=
 (which is the normal routing mode in a P2P overlay)=2C
>=3B they can =
just send directly to its IP address.
>=3B 
>=3B So when node B w=
ants to send a message to A=2C it sends the message
>=3B directly to A=
's IP address and starts a timer.  If it doesn't receive
>=3B a respon=
se within a certain amount of time=2C then it routes the message
>=3B =
to A across the overlay instead.  (Alternatively=2C B could
>=3B simul=
taneously send the message to A's IP address and across the
>=3B overl=
ay=2C which guarantees minimum response latency=2C but can waste
>=3B =
bandwidth.)
>=3B 
>=3B A over time observes what percentage of th=
e time it receives direct
>=3B messages compared to overlay messages. =
If the percentage of direct
>=3B connections is below some threshold (=
say 66%=2C picking a random number)
>=3B then may stop advertising for=
 direct connections.  But if the
>=3B percentage is high enough=2C it =
continues to advertise because it may be
>=3B helping performance.  If=
 at some point=2C the NAT changes its behavior=2C
>=3B A will notice a=
 change in its direct connection percentage and may
>=3B re-evaluate i=
ts decision to advertise a public address.
>=3B 
>=3B 
>=3B =
(There are a lot of other details how this might work=2C how it would
&g=
t=3B deal with multiple levels of NATs=2C and what the actual cost benefits=

>=3B are.  I don't want to get into all of the details of how it woul=
d work
>=3B here.)
>=3B 
>=3B This is a good example because=
 behavior-discovery is used for initial
>=3B operating mode selection=
=2C but the actual decision for whether to
>=3B continue advertising t=
hat public IP/port pair is made based on actual
>=3B operating data.  =
It's also using the result of the behavior-discovery
>=3B work as an o=
ptimization=2C not in a manner where the application will
>=3B fail if=
 a percentage of the nodes in the overlay are unable to make a
>=3B co=
nnection.
>=3B 
>=3B Bruce
>=3B 
>=3B 
>=3B On Sat=
=2C Apr 4=2C 2009 at 2:39 AM=2C Bernard Aboba <=3Bbernard_aboba@hotmail.c=
om>=3B wrote:
>=3B >=3B Bruce Lowekamp said:
>=3B >=3B
&=
gt=3B >=3B "Many of the questions you raise point to the same question of=
 whether
>=3B >=3B tests or techniques that are known to fail on a c=
ertain percentage of
>=3B >=3B NATs under a certain percentage of op=
erating conditions are
>=3B >=3B nevertheless valuable.  behavior-di=
scovery has an applicability
>=3B >=3B statement
>=3B >=3B ht=
tp://tools.ietf.org/html/draft-ietf-behave-nat-behavior-discovery-06#sectio=
n-1
>=3B >=3B that discusses those issues in some detail.  I spent e=
nough time
>=3B >=3B wording that statement and discussing it with v=
arious people that I
>=3B >=3B think it is best to refer to that sta=
tement.
>=3B >=3B
>=3B >=3B You also repeatedly uses phrases =
such as "basically won't work" and
>=3B >=3B "it might work."   The =
comes down to the value of "certain percentage"
>=3B >=3B as used ab=
ove.  My experience with these techniques=2C and the
>=3B >=3B exper=
ience of those who have used such techniques recently=2C is that
>=3B =
>=3B they are far more reliable than that=2C into the 90% range=2C partic=
ularly
>=3B >=3B when used correctly.  That is not high enough that =
we could go back to
>=3B >=3B 3489---all techniques require fallback=
s because they fail=2C and 90% is
>=3B >=3B far=2C far too low of a =
success rate---but it is high enough that
>=3B >=3B applications can=
 make useful decisions based on that information=2C
>=3B >=3B provid=
ed they have a fallback in cases where the information is wrong.
>=3B =
>=3B And those are the conditions of the experiment."
>=3B >=3B>=3B >=3B What I am failing to understand is the distinction between t=
hose
>=3B >=3B situations in which we "cannot go back to RFC 3489" a=
nd the scenarios
>=3B >=3B envisaged for the experiment.
>=3B &=
gt=3B
>=3B >=3B Presumably=2C situations in which we "cannot go back=
 to RFC 3489"
>=3B >=3B include Internet telephony=2C which may be u=
sed for life-critical
>=3B >=3B situations such as E911.  For those =
kind of scenarios=2C we need
>=3B >=3B traversal technologies that a=
re as reliable as possible=2C and are
>=3B >=3B willing to live with=
 the complexity of ICE to achieve this.
>=3B >=3B
>=3B >=3B T=
he draft mentions P2P applications as one potential situation in
>=3B =
>=3B which usage of imperfect techniques is acceptable=2C and yet the
=
>=3B >=3B IETF currently has the P2PSIP WG=2C which is involved in the<=
br>>=3B >=3B development of technology for usage of SIP over P2P networ=
ks.
>=3B >=3B In that kind of application=2C wouldn't the reliabilit=
y requirements
>=3B >=3B be similar to those in which we "cannot go =
back to RFC 3489"?
>=3B >=3B
>=3B >=3B This lead me to think =
about the requirements for the diagnostic
>=3B >=3B scenarios that a=
re also discussed in the document.  In existing
>=3B >=3B deployment=
s it is often challenging to figure out the reasons
>=3B >=3B why tr=
aversal is unsuccessful=2C and what can be done to improve
>=3B >=3B=
 the overall success rate.  Data suggests that there are even
>=3B >=
=3B common situations in which ICE will fail.  But in thinking
>=3B &g=
t=3B through how to approach diagnosis under those conditions=2C
>=3B =
>=3B I'd currently be more inclined to start from the addition of
>=
=3B >=3B diagnostics to an ICE implementation than to focus on the
>=
=3B >=3B use of the diagnostic mechanisms described in the draft.
>=
=3B >=3B
>=3B >=3B So while I'm generally sympathetic to the idea =
that there
>=3B >=3B are situations in which "less than perfect" tec=
hniques can
>=3B >=3B be useful=2C in practice a number of common si=
tuations
>=3B >=3B where NAT traversal is used today (such as life-c=
ritical
>=3B >=3B Internet telephony) do not seem to fit into that b=
ucket.
>=3B >=3B
>=3B >=3B It could be that I didn't quite un=
derstand the examples
>=3B >=3B given in the applicability statement=
=2C or that I'm putting
>=3B >=3B too much emphasis on corner condit=
ions=2C because that is
>=3B >=3B what customers tend to complain ab=
out.
>=3B >=3B
>=3B >=3B However=2C overall the document left=
 me unclear about the
>=3B >=3B rationale by which the material depr=
ecated in RFC 3489
>=3B >=3B was being re-introduced.   While it doe=
s seem possible
>=3B >=3B to construct a rationale for this=2C the d=
ocument doesn't
>=3B >=3B provide enough background to get me over t=
hat hump.
>=3B >=3B
>=3B >=3B
>=3B >=3B
>=3B >=
=3B
>=3B >=3B
>=3B >=3B
>=3B >=3B ____________________=
___________________________
>=3B >=3B Ietf mailing list
>=3B &g=
t=3B Ietf@ietf.org
>=3B >=3B https://www.ietf.org/mailman/listinfo/i=
etf
>=3B >=3B
>=3B >=3B

=

--_f8b568be-3254-4ecf-83ab-fa37b0266291_--

From fred@cisco.com  Wed Apr  8 10:22:15 2009
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Cc: Xing Li , "" , Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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On Apr 7, 2009, at 2:11 PM, Iljitsch van Beijnum wrote:

> On 7 apr 2009, at 18:33, Fred Baker wrote:
>
>>> Do we have to address the conformity to Modified EUI-64 format for  
>>> v4v6 addresses? In particular the so-called UG bits?
>
>> The CERNET prototype hasn't had any issues with ignoring them.
>
> There could still be trouble down the road, the point of  
> specifications is that two or more people follow them.
>
>> So, especially given privacy addressing, we can't really assume  
>> that the router or neighboring host is going to extract a MAC  
>> address from the interface identifier and directly use it to direct  
>> a datagram to another host;
>
> Right. But then, nobody is suggesting that.
>
>> Given that the address architecture specifies the bits but only  
>> uses them to ensure that the interface identifier is not "all  
>> zeroes" and is unique, and in this context the addresses are in  
>> fact unique, my sense would be to ignore the question.
>
> What we lose in that case is the possibility of recognizing a  
> certain class of addresses just by looking at the interface  
> identifier. That is not something we have any use for today, but we  
> might in the future.

Perhaps. We haven't needed it in IP, apart from the fairly ancient  
notion of using all ones in the host identifier to generate a local  
subnet broadcast. For security reasons, that has been deprecated, and  
IPv6 uses a different format for such things.

> By coincidence we ended up in the situation that it's as good as  
> impossible to have an interface identifier with 11 in the two lower  
> bits of the upper byte (u/l = unique, group = yes) because only  
> stateless autoconfig and other eui-64 derived configuration set the  
> u/l bit to unique, but since it doesn't make sense to create a  
> unicast network address from a multicast link address, the g bit is  
> always 0 in that case.
>
> So if we ever find a use for being able to recognize a special class  
> of interface identifiers we could use the unique/group combination  
> for those and have only a minimal chance of clashing with other  
> address types. It would be a shame to throw away this possibility  
> without a good reason.

Well, yes. But I think at least part of the question Pierre asked was  
- if we don't have a particularly good reason to worry about it, why  
specifically is Teredo worried about it?

You have heard the famous Einstein quip, that one is done describing  
something not when everything has been included, but when everything  
unnecessary has been carted away. If one is using a MAC address as a  
MAC address, as I alluded to above, including the flags in the MAC  
address that it defines makes a lot of sense. If one is not and there  
is no well-understood reason to include the issue, why break bones  
worrying about it?

I'll step away from the posiiton if someone can give me a good reason,  
but at this point I don't see one.

From fred@cisco.com  Wed Apr  8 10:28:25 2009
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Cc: Xing Li , "" , Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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Let me restate what I think you said in my words. If I get it wrong, I =20=

missed you.

I think you are arguing that an IPv6 address is first and foremost a =20
CIDR address - routers have some knowledge of prefix lengths due to =20
their advertisement in routing protocols, and hosts on a LAN know =20
something about the local LAN's prefix length because if the =20
assumptions built into the handling of an address - SLAAC Really Wants =20=

the prefix to be a /64, but DHCP is essentially assigning a /128 and =20
the host doesn't need to understand the big picture of the rules as =20
long as it accepts any /128 from any immediate neighbor, and other =20
mechanisms are like DHCP in that regard. So apart from CIDR rules and =20=

SLAAC assumptions in address prefixes governed by SLAAC, nobody should =20=

make any assumptions.

Did I get that right?

On Apr 8, 2009, at 2:50 AM, R=E9mi Despr=E9s wrote:

> Fred Baker  -  le (m/j/a) 4/7/09 6:33 PM:
>> On Apr 2, 2009, at 11:50 PM,  =
> > wrote:
>>> Do we have to address the conformity to Modified EUI-64 format for =20=

>>> v4v6 addresses? In particular the so-called UG bits? In that case, =20=

>>> is it still possible to have an IPv4 embedded address that crosses =20=

>>> the 64bit boundary? If we do not care, why does Teredo (which =20
>>> includes two IPv4 addresses) care?
>> The CERNET prototype hasn't had any issues with ignoring them.
>
>> Other thoughts?
>
> If I understand it right, distinguishing between EUI-64 and local-=20
> scope identifiers IS necessary where subnet prefixes are /64, but =20
> ONLY in this case.
>
> A node outside a destination subnet is not expected to make any
> assumption on the length of this subnet prefix.
>
> Thus, extension of prefixes beyond /64 can be done freely, without
> concern with a rule for links where subnet prefixes are /64.
>
> As a matter of fact, this reasoning has been important to =20
> significantly simplify draft-despres-sam-xx between versions 01 and =20=

> 02.
>
> Regards,
>
> RD
>
>


From brian.e.carpenter@gmail.com  Wed Apr  8 15:19:07 2009
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Date: Thu, 09 Apr 2009 10:20:09 +1200
From: Brian E Carpenter 
Organization: University of Auckland
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Cc: Behave WG , Russ Housley , iesg@ietf.org, Behave Chairs 
Subject: Re: [BEHAVE] DISCUSS: draft-ietf-behave-turn
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I was the Gen-ART reviewer whoes review led to Russ's comment.
So...

On 2009-04-08 16:01, Philip Matthews wrote:
> 
> On Sat, 4-Apr-09, at 16:09 , Russ Housley wrote:
> 
>> Discuss:
>>
>>  The IAB Considerations in RFC 3424 have not been changed, and it
>>  is clear to me that TURN has an indefinite lifetime.  So, the first
>>  two IAB UNSAF criteria cannot realistically be satisfied.  I do not
>>  want to delay the document, but I do think it should include a
>>  recognition of this conflict.  I'm happy with an IESG note or text
>>  in the body of the document.
>>
> 
> Actually, RFC 3424 only very tangentially applies to TURN, since TURN is
> just a protocol for controlling a relay. RFC 3424  applies to STUN and
> ICE much more directly.
> 
> Consideration 1 simply asks for a precise definition of the problem that
> TURN fixes, so I don't see what else can be said here.

Actually it specifically says "A short term fix should not be generalized
to solve other problems." and the TURN draft says

>    ...However, care has been taken to
>    make sure that TURN is suitable for other types of applications

Reading those two statements gave me a little cognitive dissonance.
Maybe you can add something like

Note that although TURN can be applied beyond the domain of SIP
usage, it can only satisfy these limited purposes.

However, this isn't a big deal IMHO.

> 
> However, Consideration 2 asks for an exit strategy or transition plan.
> Here I have changed the text of the response to Consideration 2 to read:
> 
>     Response: TURN will no longer be needed once there are no longer
>     any NATs.  Unfortunately, as of the date of publication of this
>     document, it no longer seems very likely that NATs will go away
>     any time soon. However, the need for TURN will also decrease as
>     the number of NATs with the mapping property of Endpoint-Independent
>     Mapping [RFC4787] increases.

Works for me.

    Brian

From dthaler@windows.microsoft.com  Wed Apr  8 17:01:42 2009
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From: Dave Thaler 
To: "behave@ietf.org" 
Date: Wed, 8 Apr 2009 17:02:46 -0700
Thread-Topic: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery	(NATBehavior Discovery Using STUN) to Experimental RFC
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Cc: "draft-ietf-behave-nat-behavior-discovery@tools.ietf.org" 
Subject: Re: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-discovery	(NATBehavior Discovery Using STUN) to Experimental RFC
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I also agree with many of Cullen's points.

I think one point is that "Example Use with P2P Overlays" is not necessaril=
y the best example.  Perhaps a better example, which is mentioned elsewhere=
 in the doc, is a diagnostic tool to fingerprint the NAT and maybe alert th=
e user if it observes any behavior that is against the recommendations.  Bu=
t if the results aren't reliable, a P2P Overlay developer may not be able t=
o reliably use it.  I do understand part of the point of the document is to=
 suggest an experiment in this area.  I might suggest using a diagnostic to=
ol as an "example", and then in a section after that, have "Experiment with=
 P2P Overlays".

I understand there's consensus that there are cases where it will work and =
cases where it won't.  Simply periodically re-running the tests doesn't mak=
e it work/not-work after being run, it just means it's up to date and will =
work if it works in the current case, and won't work if it won't work in th=
e current case.  I think this could be more clearly stated early in the doc=
ument (the beginning of section 1 is pretty close already).

On the topic of RESPONSE-TARGET, I completely agree with Cullen here... I c=
ouldn't follow from the current text, what the RESPONSE-TARGET was useful f=
or that couldn't be done without it.  I would prefer that it be either remo=
ved, or barring that, that it be better explained what it's needed for that=
 can't be done without it.  The requirement this introduces to keep state o=
n the STUN server is undesirable in my view.

-Dave Thaler
(no hats)

> -----Original Message-----
> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf Of Christian Huitema
> Sent: Wednesday, April 01, 2009 12:20 AM
> To: Dan Wing; behave@ietf.org
> Cc: draft-ietf-behave-nat-behavior-discovery@tools.ietf.org
> Subject: Re: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-
> discovery (NATBehavior Discovery Using STUN) to Experimental RFC
>
> I tend to agree with Cullen on some points. Instead of a draft
> presenting a set of algorithm, I would rather see a draft presenting a
> set of tools that can be useful for characterizing local connectivity,
> and presenting these tools as justifying a new set of STUN options that
> applications developers could then use as they see fit.
>
> The draft proposes a set of algorithms to characterize a NAT. As Cullen
> points out, any of these algorithms has weaknesses. The main weakness
> is that the behavior of NAT is often transient, e.g. different port
> mapping algorithms depending on whether or not the internal tables are
> near saturation, or not. So, any attempt to present an algorithm as a
> definitive classifier is, by nature, weak. On the other hand, even weak
> attempts are useful, especially in peer-to-peer applications, but also
> for network management and debugging. There is a tradeoff between
> resource consumed and precision of the characterization. This tradeoff
> is largely for the application developers and users to decide.
>
> The interesting question is, what mechanisms do application developers
> need, in addition to the basic response system defined in STUN? Most of
> these new mechanisms fall direct a server to send packets to a
> different address, to a different port, or at a different time, plus
> indeed a negotiation mechanism to determine whether such mechanisms are
> available. I don't see much harm in defining these mechanisms and the
> corresponding options. Indeed, I see some goodness in defining them
> once, in the IETF.
>
> The main goodness comes form a way to control the use of the
> mechanisms. Sending responses to a different address, to a different
> port, or at a different time has a risk. Such mechanisms can be used
> for denial of service attacks. If we are convinced that the draft
> mitigates such denial of service attacks, then we should register the
> corresponding attributes.
>
>
>
> > -----Original Message-----
> > From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf
> > Of Dan Wing
> > Sent: Tuesday, March 31, 2009 8:09 PM
> > To: behave@ietf.org
> > Cc: draft-ietf-behave-nat-behavior-discovery@tools.ietf.org
> > Subject: [BEHAVE] FW: Last Call: draft-ietf-behave-nat-behavior-
> > discovery (NATBehavior Discovery Using STUN) to Experimental RFC
> >
> > Forwarded for those that don't follow the main IETF list.
> >
> > Please reply to the list if you agree or disagree with the points
> raised
> > by
> > Cullen.  Thanks.
> >
> > -d
> >
> >
> > -----Original Message-----
> > From: ietf-bounces@ietf.org [mailto:ietf-bounces@ietf.org] On Behalf
> Of
> > Cullen
> > Jennings
> > Sent: Tuesday, March 31, 2009 9:53 AM
> > To: IETF Discussion; IESG IESG
> > Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-
> > discovery
> > (NATBehavior Discovery Using STUN) to Experimental RFC
> >
> >
> > I was somewhat shocked to see the draft in IETF Last Call. The last
> > time this draft was discussed at the microphone in Behave, many
> people
> > were very concerned that it id not possible to correctly characterize
> > a NAT without using more than one address behind the NAT. The tests
> > done on on NATs by the researches at MIT did that, so did the the
> > stuff from Cornell, as did draft-jennings-behave-test-results. The
> > reason why this was needed is largely the reason why the IETF
> invented
> > ICE. Initially folks thought that STUN alone would be enough to do
> NAT
> > traversal. This turned out not to be true, STUN deprecated those
> parts
> > and ICE was started. This draft fails to describe the types of test
> > that have actually been found to work and just reinstates the stuff
> > that was deployed and failed and then deprecated out of STUN.
> >
> > Now this draft pays some lip service to the fact that it basically
> > won't work. You can read section 1 and get the full idea. The first
> > and 2'nd par basically say this won't work. Then para 3 proposes this
> > is experiment to find out something we already know the answer to.
> > When this work was chartered, it was about making a way to
> > characterize NATs and describe them in a controlled lab like
> > environment. It was not about resurrecting exactly the part of STUN
> > that had been tried, failed , and deprecated.
> >
> > Specific problems with the draft....
> >
> > 2.2 - this just won't work. The test described in this draft will not
> > find out if the node is behind an endpoint independent nat. I have
> > specific nats where it won't work. I have explained to the authors
> why
> > it won't work. The answer I get back is "it might work some of the
> > time". It true it might work some of the time but we all agree there
> > are many NATs for which it will not work.
> >
> > Other section that don't work are 3.1, 3.2, 3.3, 3.4, 3.5, 3.5 - uh
> > all of them actually. I'm glad to provide details on why they don't
> > work but I have in the past and we not really debating if they work
> or
> > not. The authors believe there is sufficient text at the beginning of
> > the draft in section 1 that it is OK that these fail in many cases
> and
> > don't need to be mentioned again. We not debating these work some of
> > the but not all the time - everyone agrees on that.
> >
> > Section 4.1 - The results in here will be just wrong for ports
> > different than the one the test was run on. The response to this was
> > to add "use same port when possible". That's not going to exactly
> > cause applications to work.
> >
> > Section 4.2 - Can't really separate the topic from if UDP is blocked
> > from if the STUN server is down.
> >
> > Section 4.4 - this fails if the port was recently used for similar
> > tests from same stun server. There no way to know this as an
> > application. This type of test can work in lab condition where all
> > traffic on NAT is controlled but it operational networks it will
> fail.
> >
> > It is possible to do timing testing using just the change ip flag.
> The
> > REPSONSE-TARGET stuff is not needed and open up the possibility to
> > have a STUN server send packets to places that it should not which
> > causes IDS system to black list all traffic from the STUN server thus
> > making it unusable for other clients. The ability to tell the STUN
> > server to send packets to arbitrary locations would be fine for a
> > system in a lab used to characterize a NAT but is not a good idea for
> > internet deployed STUN servers.
> >
> > The bulk of these issues were sent Aug 28 to behave list during the
> > 2nd WGLC. I requested agenda time during IETF 74 to discuss these
> > issues but it was denied.
> >
> > In summary -The approaches described in this draft are known to fail
> > with many NATs. I don't see any evidence of the WG actually having
> > read this draft much less have consensus on the approach in it. I
> > think the WG should spend meeting time to discuss the topic and
> decide
> > what to do. The key topic in my mind is we are defining a document
> > that allows us to characterize a NAT in a lab or if we are trying to
> > make something that works in field and can be used to aid NAT
> > traversal in applications.
> >
> > Cullen 
> >
> >
> >
> >
> >
> > On Mar 10, 2009, at 8:44 AM, The IESG wrote:
> >
> > > The IESG has received a request from the Behavior Engineering for
> > > Hindrance Avoidance WG (behave) to consider the following document:
> > >
> > > - 'NAT Behavior Discovery Using STUN '
> > >    as an
> Experimental
> > > RFC
> > >
> > > The IESG plans to make a decision in the next few weeks, and
> solicits
> > > final comments on this action.  Please send substantive comments to
> > > the
> > > ietf@ietf.org mailing lists by 2009-03-31. Exceptionally,
> > > comments may be sent to iesg@ietf.org instead. In either case,
> please
> > > retain the beginning of the Subject line to allow automated
> sorting.
> > >
> > > The file can be obtained via
> > >
> > http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-
> > discovery-0
> > 6.txt
> > >
> > >
> > > IESG discussion can be tracked via
> > >
> >
> https://datatracker.ietf.org/public/pidtracker.cgi?command=3Dview_id&dTag
> =3D
> > 15728&
> > rfc_flag=3D0
> > >
> > > The following IPR Declarations may be related to this I-D:
> > >
> > > https://datatracker.ietf.org/ipr/919/
> > > https://datatracker.ietf.org/ipr/945/
> > >
> > >
> > > _______________________________________________
> > > Behave mailing list
> > > Behave@ietf.org
> > > https://www.ietf.org/mailman/listinfo/behave
> >
> > _______________________________________________
> > Ietf mailing list
> > Ietf@ietf.org
> > https://www.ietf.org/mailman/listinfo/ietf
> >
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From philip_matthews@magma.ca  Wed Apr  8 18:37:53 2009
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From: Philip Matthews 
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Cc: Behave WG 
Subject: Re: [BEHAVE] Is TURN inefficient for certain applications?
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Changing the topic to discuss a point that Matthew made.

On Wed, 8-Apr-09, at 11:43 , Matthew Kaufman wrote:

>
> More recent TURN drafts have made TURN less efficient and more  
> difficult to implement for use with a protocol that operates as  
> RTMFP does (specifically, the requirement to allocate individual  
> bindings prior to use, which conflicts with a protocol which wishes  
> to send a flurry of single packets to candidate destination  
> addresses at session startup, most of which will never be used  
> again), ...

Can you explain in more detail what you mean about this inefficiency  
point, perhaps with a call-flow diagram? If I understand your  
application correctly, without Long-Term Credentials this could be  
done as follows:

Client                         Server
   |--- Allocate request ----------------------->|
   |<----------------------- Allocate response --|
   |                                             |
   |-- CreatePermission (list of permissions) -->|
   |<----------- CreatePermission response ------|
   |                                             |
   |-- Send ind (packet to destination A)------->|
   |-- Send ind (packet to destination B)------->|
   |-- Send ind (packet to destination C)------->|
        etc.

This seems pretty efficient. In fact, you can send the  
CreatePermission before receiving the Allocate response, which makes  
the exchange run faster. (An a future enhancement, one could even  
devise a way to put the Allocate and CreatePermission into a single  
packet).

What am I missing?

- Philip


From matthew@matthew.at  Wed Apr  8 20:57:06 2009
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From: Matthew Kaufman 
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Cc: Behave WG 
Subject: Re: [BEHAVE] Is TURN inefficient for certain applications?
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Philip Matthews wrote:
> Changing the topic to discuss a point that Matthew made.
>
> On Wed, 8-Apr-09, at 11:43 , Matthew Kaufman wrote:
>
>>
>> More recent TURN drafts have made TURN less efficient and more 
>> difficult to implement for use with a protocol that operates as RTMFP 
>> does (specifically, the requirement to allocate individual bindings 
>> prior to use, which conflicts with a protocol which wishes to send a 
>> flurry of single packets to candidate destination addresses at 
>> session startup, most of which will never be used again), ...
>
> Can you explain in more detail what you mean about this inefficiency 
> point, perhaps with a call-flow diagram? If I understand your 
> application correctly, without Long-Term Credentials this could be 
> done as follows:
>
> Client                         Server
>   |--- Allocate request ----------------------->|
>   |<----------------------- Allocate response --|
>   |                                             |
>   |-- CreatePermission (list of permissions) -->|
>   |<----------- CreatePermission response ------|
>   |                                             |
>   |-- Send ind (packet to destination A)------->|
>   |-- Send ind (packet to destination B)------->|
>   |-- Send ind (packet to destination C)------->|
>        etc.
>
> This seems pretty efficient. In fact, you can send the 
> CreatePermission before receiving the Allocate response, which makes 
> the exchange run faster. (An a future enhancement, one could even 
> devise a way to put the Allocate and CreatePermission into a single 
> packet).
>
> What am I missing?
>
> - Philip
>
Mostly the problem comes from the fact that we don't know all the 
addresses for the CreatePermission until we've done a few send 
indications and gotten responses back. That, and the fact that our 
implementation has a protocol stack that very deliberately doesn't know 
about TURN and a virtual interface that does the TURN part... 
CreatePermission means that the virtual interface isn't just "set up and 
use" but becomes "adjust for every new destination address the protocol 
stack tries to use". Here's some more detail:

Without a TURN server, our packet flow is one of these (from the POV of 
the client... there is also other packet flow from the server which 
isn't shown):

(case 1):
Client looks up A record and receives list of 1 or more IPv4 addresses
Client looks up AAAA record and receives list of 1 or more IPv6 addresses
Client sends to UDP port 1935 at some or all of those addresses
One or more of those packets elicit responses which redirect client to a 
new port number and possibly new IP address
Those redirections are added to the list of addresses which are being 
opened to
Each newly-added address+port and any address+port for which a 
retransmit timer has fired is sent another packet
Eventually a packet is returned which causes a session to be established 
and packet flow is entirely between that address+port pair, unless IP 
mobility occurs in which case probes are sent to confirm mobility, then 
the session is moved to the new address.

(case 2):
Client is already talking to a server at an existing address and port
Client sends a UDP packet to that server to open a peer-to-peer connection
Server responds with a list of candidate IPv4 and/or IPv6 addresses 
which may include actual addresses of the peer, addresses of servers 
which know the address of the peer, or addresses of servers which can 
relay introductions to the peer
Client sends a UDP packet to each of those candidate addresses (up to a 
limit in each round)
Some of those may cause responses which redirect client to additional 
new IP addresses+port number
Each newly-added address+port and any address+port for which a 
retransmit timer has fired is sent another packet
Eventually a packet is returned which causes a session to be established 
and packet flow is entirely between that address+port pair, unless IP 
mobility occurs in which case probes are sent to confirm mobility, then 
the session is moved to the new address.

This is all implemented by a highly platform-independent protocol stack 
library.

With a TURN server, the platform implements an additional interface for 
the library which is actual a virtual interface with a TURN 
implementation underneath.

Then the packet flows, now that CreatePermission is required, look like 
this:

(case 1):
When the client is first started, the platform performs an Allocate to 
set up the TURN server end of the virtual interface.
Client looks up A and AAAA records
Client tries to send packets to these addresses at port 1935, but the 
platform has to stop and do a CreatePermission to each. It is committed 
to sending these, so it does, even if by the time the CreatePermission 
is done the protocol stack has actually received a packet back which 
causes the binding to a single address and port for a session.
One or more of these packets elicits responses which redirect client to 
a new port number and possibly new IP address.
These redirections are added to the list of addresses which are being 
opened to
Each newly-added address+port is sent another packet, but the platform 
has to stop at this point again and send a CreatePermission. Again, 
there is a window during which the platform is committed to sending the 
packet and is waiting for the CreatePermission handshake, but the 
protocol stack may in fact learn that it no longer needs to send that 
packet.
And, of course, at this point we've now made what might be a dozen 
CreatePermission requests and waited for responses, some of which we 
could bunch up because we had all the addresses at once (like if they 
came in a single DNS reply), but others had to be sent one at a time 
because we needed to do the CreatePermission ASAP when the redirection 
came in and didn't know that milliseconds later we'd actually have a 
second redirect packet in hand that needs even more permissions added. 
If the TURN server is at the far side of a corporate VPN, the latency 
for each is high.
Eventually a packet is returned which causes a session to be established 
and packet flow is entirely between that address+port pair. If IP 
mobility of the client behind the TURN server occurs, TURN isn't 
mobility-aware and so the client totally loses their association with 
the TURN server. Game over. If IP mobility of the other side occurs, the 
probes can't be sent until a CreatePermission is sent and responded to, 
which may again in the VPN case add significantly to the time required 
to effect the mobility switchover.

case 2 is similar, but worse because we have an even bigger list of 
candidate addresses and it may be that *both sides* are behind TURN 
servers, and so just responding requires doing CreatePermission as well. 
This is extra fun if they're both behind the *same* TURN server, so 
eventually use a discovery mechanism (we have several) that finds the 
behind-firewall addresses and uses them but in the meantime they've each 
made a bunch of CreatePermission requests and are still waiting for them 
when the session does come up.

Matthew Kaufman

From remi.despres@free.fr  Fri Apr 10 07:14:26 2009
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Cc: Xing Li , "" , Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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Fred Baker  -  le (m/j/a) 4/8/09 7:28 PM:
> Let me restate what I think you said in my words. If I get it wrong, I 
> missed you.
> 
> I think you are arguing that an IPv6 address is first and foremost a 
> CIDR address - routers have some knowledge of prefix lengths due to 
> their advertisement in routing protocols,
In routers that have no direct interface with source or destination
links, an IPv6 address is processed according to the CIDR logic, yes.

(*) In routers that have direct interfaces to source or destination links,
there are two cases:
(A) If the address space on the link is global, the rule 64-bit-IID rule
applies to global addresses.
(B) If global packets are locally encapsulated, this rule doesn't need
to apply to global addresses.

> and hosts on a LAN know 
> something about the local LAN's prefix length because if the assumptions 
> built into the handling of an address

With RS and RAs, exchanged in the link-local address space, hosts know
link subnet prefix lengths independently of their global addresses.

> - SLAAC Really Wants the prefix to 
> be a /64,

For IIDs that are modified EUI-64, a /64 prefix is indeed needed.

(**) But, unless I miss something, this constraint could be relaxed for 
local scope IIDs if found useful for some new function.

> ... So apart from CIDR rules and SLAAC assumptions in 
> address prefixes governed by SLAAC, nobody should make any assumptions.

No assumption on formats in fields that are not processed locally.

> 
> Did I get that right?

I think so.

Points (*) and (**) go beyond what was said previously.

Regards,

RD


> 
> On Apr 8, 2009, at 2:50 AM, Rémi Després wrote:
> 
>> Fred Baker  -  le (m/j/a) 4/7/09 6:33 PM:
>>> On Apr 2, 2009, at 11:50 PM,  
>>>  wrote:
>>>> Do we have to address the conformity to Modified EUI-64 format for 
>>>> v4v6 addresses? In particular the so-called UG bits? In that case, 
>>>> is it still possible to have an IPv4 embedded address that crosses 
>>>> the 64bit boundary? If we do not care, why does Teredo (which 
>>>> includes two IPv4 addresses) care?
>>> The CERNET prototype hasn't had any issues with ignoring them.
>>
>>> Other thoughts?
>>
>> If I understand it right, distinguishing between EUI-64 and 
>> local-scope identifiers IS necessary where subnet prefixes are /64, 
>> but ONLY in this case.
>>
>> A node outside a destination subnet is not expected to make any
>> assumption on the length of this subnet prefix.
>>
>> Thus, extension of prefixes beyond /64 can be done freely, without
>> concern with a rule for links where subnet prefixes are /64.
>>
>> As a matter of fact, this reasoning has been important to 
>> significantly simplify draft-despres-sam-xx between versions 01 and 02.
>>
>> Regards,
>>
>> RD
>>
>>
> 
> 




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From: "Craig, Dave" 
To: Philip Matthews , Behave WG 
Date: Fri, 10 Apr 2009 15:06:26 -0700
Thread-Topic: [BEHAVE] TURN: Make Security a MUST for servers?
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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What about keeping the Short-Term Credential, but adding a security conside=
ration that a TURN usage should keep a short-term credential alive as long =
as the TURN server keeps a Nonce alive?

Thanks,
Dave

> -----Original Message-----
> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf Of Philip Matthews
> Sent: Wednesday, April 08, 2009 5:00 AM
> To: Behave WG
> Subject: [BEHAVE] TURN: Make Security a MUST for servers?
>=20
> At present, the TURN spec says:
> * a server SHOULD use the Long-Term Credential mechanism, and
> * a client MUST be prepared to use the mechanism if the server
> requires it.
>=20
> One thing that has come up in the IESG review of TURN is the question
> of whether the SHOULD for servers should be changed to a MUST. The
> motivation is that TURN typically has terrible security if the Long-
> Term Credential mechanism is not used.
>=20
> Right now, I see two occasions where a server might not want to use
> the Long-Term Credential mechanism:
> 1) If the client is using TLS transport between the client and the
> server, and if the server has some way to confirm that the client is
> authorized to use the server (or if the server doesn't care);
> 2) In special environments, where security is not an issue (for
> example, inside a corporate environment, where TURN is being used to
> work through an internal NAT).
>=20
> Can anyone think of any other cases?
>=20
> Comments on this topic? How do people feel about it?
>=20
> What have various implementors done? Has everyone implemented the Long-
> Term Credential mechanism on the client side? On the server side?
>=20
> - Philip
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From philip_matthews@magma.ca  Sat Apr 11 18:58:48 2009
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From: Philip Matthews 
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Cc: Russ Housley , Behave WG , iesg@ietf.org, Behave Chairs 
Subject: Re: [BEHAVE] DISCUSS: draft-ietf-behave-turn
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On Wed, 8-Apr-09, at 18:20 , Brian E Carpenter wrote:

> On 2009-04-08 16:01, Philip Matthews wrote:
>>
>> Consideration 1 simply asks for a precise definition of the problem  
>> that
>> TURN fixes, so I don't see what else can be said here.
>
> Actually it specifically says "A short term fix should not be  
> generalized
> to solve other problems." and the TURN draft says
>
>>  ...However, care has been taken to
>>  make sure that TURN is suitable for other types of applications
>
> Reading those two statements gave me a little cognitive dissonance.
> Maybe you can add something like
>
> Note that although TURN can be applied beyond the domain of SIP
> usage, it can only satisfy these limited purposes.
>
> However, this isn't a big deal IMHO.

Speaking for myself, I think that STUN/TURN/ICE is a general approach  
to NAT traversal, and not something just usable by SIP. In this  
regard, I will note that both RELOAD (the peer-to-peer protocol being  
developed in P2PSIP) and HIP now use STUN/TURN/ICE for NAT traversal.

So I am uncomfortable with adding your suggested sentence, since it  
seems to suggest that TURN can be used only for SIP-related purposes.

The problem I feel we are wrestling with is that the UNSAF document  
was hoping that either (a) NATs would go away soon, or (b) a better  
NAT traversal solution would soon emerge. Unfortunately, neither of  
these have happened in the years since it was published and neither  
seem likely to happen in the near future.

Finally, I will note that the only aspect of TURN which can be  
considered "Unilateral Self-Address Fixing" is the inclusion of the  
XOR-MAPPED-ADDRESS in the Allocate response. The value returned in  
this attribute is not used later in the protocol at all -- it is  
included only as a convenience to the client, who would otherwise have  
to do a Binding transaction with a STUN server.

- Philip


From philip_matthews@magma.ca  Sat Apr 11 18:58:54 2009
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Cc: Behave WG 
Subject: [BEHAVE] Proposed Resolutions to COMMENTs and DISCUSSes on TURN
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Here =
are my proposed resolutions to various DISCUSSes and COMMENTs from the =
IESG evaluation of TURN-13 (draft-ietf-behave-turn-13)
See =
https://datatracker.ietf.org/idtracker/draft-ietf-behave-turn/

Resp=
onses to the other DISCUSSes and COMMENTs are already being discussed =
elsewhere.

- Philip

=46rom Alexey =
Melnikov:

Comment:
In =
Section 6.2: 5. The server checks if the request contains an EVEN-PORT =
attribute. If yes, then the server checks that it satisfy the =
request.
Missing word: ... =
that it *can* satisfy =
...

Fixed.

---

=46rom Tim =
Polk:

Comment:section 2, next-to-last =
paragraph:
s/to application =
data/to send application =
data/

Fixed.

section =
2.4, para 3:
s/an =
XOR-PEER-ADDRESS attribute specify/an XOR-PEER-ADDRESS attribute =
specifying/

Fixed.


---

=46rom =
Cullen Jennings:

Comment:
Seems =
weird that we can negotiate lifetimes of allocations but not permissions =
or channels bindings. Why?

Myself, I don't see right =
now any reason to negotiate permission lifetimes or channel binding =
lifetimes. I don't currently see any reason an application would want to =
make these lifetimes smaller, and I feel the default values (5 minutes =
and 10 minutes, respectively) are sufficiently long enough so as not to =
be a burden on applications.

If I was doing TURN over again, I =
would argue for removing the ability to negotiate allocation lifetimes, =
as 10 minutes seems to be fine for this purpose, and the ability to =
negotiate the lifetime just adds complexity.

I suggest we wait =
until we get more deployment experience with TURN and see if there is a =
solid need to make these negotiable.



Comment:
Padding =
up the Channel Data messages over TCP is a waste of bandwidth - why is =
it needed?

This was done to be consistent with =
STUN-formatted messages of TURN. All the STUN-formatted messages are a =
multiple of 4 bytes. Padding Channel Data messages means that all TURN =
messages on the TCP stream (both the Channel Data messages and the =
STUN-formatted messages) are multiples of four bytes and will thus =
always start on a 4-byte boundary. This may help with the parsing of =
incoming messages. Not padding Channel Data messages would break the =
alignment for the STUN-formatted messages.

I agree that there are =
protocols that take a different approach (for example, BGP attributes =
are not padded that thus a parser can not make alignment =
assumptions).

This was briefly discussed on the BEHAVE mailing =
list a couple of months ago, and there was no support at the time for =
changing this.


Discuss:
Refresh's, allocations, permission, and channel bindings =
request MUST be authenticated to meet the security =
requirements.

I view this as a repeat of Tim Polk's =
DISCUSS, which is currently being discussed on the BEHAVE mailing =
list.

Discuss:
The =
lack of authentication on the redirect response makes it trivial to DDOS =
any set of clients trying to use a STUN server by just redirecting them =
to a server that does not work.

This is a feature of =
STUN, which is simply inherited by TURN. You will recall that redirect =
responses in STUN used to be authenticated, and was removed at your =
request so you could do anycast discovery of TURN servers. Anyway, see =
RFC 5389 (the STUN specification) for the security discussion of this =
feature. For TURN, you can indeed DDOS a set of clients in this way, but =
you have to have an attacker at just the right point to do this. Such an =
attacker can DDOS the clients in many other ways (e.g., by quickly =
sending a 400 Bad Request reply to the initial Allocate request before =
the server can reply). I am not an expert here, but I believe that even =
a TLS session is not immune to such an attacker, as the attacker can =
send a TCP RST in response to the initial TCP SYN.

Discuss:
Section =
10.3 needs to say the server MUST discard the packet if there is no =
permission to meet the security =
requirements.

Actually, it is right there in the =
last sentence of the first paragraph:

   When the =
server receives a UDP datagram at a currently allocated
 =
  relayed transport address, the server looks up the =
allocation
   associated with the relayed transport =
address.  It then checks to see
   if relaying is =
permitted, as described in Section 8.
Section 8 is the section that =
discusses =
permissions.

---

=46rom =
Adrian Farrel:
Comment:
I understand that other-then-UDP =
mechanisms for server-peer communications will follow, but I find it =
confusing that the Introduction discusses client-server TCP and TLS =
services since the client is presumably actually interested in =
client-peer delivery. Also that Figure 1 shows a peer behind a NAT and =
the text comments that some firewalls block UDP entirely.

Would =
it be helpful to draw out more clearly what deployments and service =
functions are not possible with the UDP-only variety of TURN? (There is =
some discussion in section 2.4 of the security of the server-peer data =
being the protected through encryption or =
similar.)

I confess to being unsure =
what more I could say, probably because I am so close to this work that =
everything seems obvious. There were some paragraphs about this in =
TURN-13, but I have reworked them a bit so they now =
say:

   Since this version of TURN only =
supports UDP between the server and
   the peer, it =
is expected that most clients will prefer to also =
use
   UDP between the client and the server. That =
being the case, some
   readers may wonder: Why also =
support TCP and TLS over TCP?

   =
TURN supports TCP transport between the client and the server =
because
   some firewalls are configured to block =
UDP entirely.  These firewalls
   block UDP but =
not TCP in part because TCP has properties that =
make
   the intention of the nodes being protected =
by the firewall more
   obvious to the firewall. =
 For example, TCP has a three-way handshake
   =
that makes in clearer that the protected node really wishes to =
have
   that particular connection established, =
while for UDP the best the
   firewall can do is =
guess which flows are desired by using filtering
   =
rules.  Also, TCP has explicit connection teardown, while for UDP =
the
   firewall has to use timers to guess when the =
flow is finished.

   TURN supports =
TLS over TCP transport between the client and the
   =
server because TLS provides additional security properties =
not
   provided by TURN's default digest =
authentication; properties which
   some clients may =
wish to take advantage of.  In particular, =
TLS
   provides a way for the client to ascertain =
that it is talking to the
   server that it intended =
to, and also provides for confidentiality of
   TURN =
control messages.  TURN does not require TLS because =
the
   overhead of using TLS is higher than that of =
digest authentication;
   for example, using TLS =
likely means that most application data will
   be =
doubly encrypted (once by TLS and once to ensure it is =
still
   encrypted in the UDP =
datagram).

Is this =
better?

=

From brian.e.carpenter@gmail.com  Sat Apr 11 22:03:54 2009
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Date: Sun, 12 Apr 2009 17:04:54 +1200
From: Brian E Carpenter 
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Cc: Russ Housley , Behave WG , iesg@ietf.org, Behave Chairs 
Subject: Re: [BEHAVE] DISCUSS: draft-ietf-behave-turn
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Philip,

I have a lot of sympathy with your position; I just wanted
to be sure that the IESG knows about the issue, to avoid
any later complaints.

    Brian

On 2009-04-12 12:46, Philip Matthews wrote:
> 
> On Wed, 8-Apr-09, at 18:20 , Brian E Carpenter wrote:
> 
>> On 2009-04-08 16:01, Philip Matthews wrote:
>>>
>>> Consideration 1 simply asks for a precise definition of the problem that
>>> TURN fixes, so I don't see what else can be said here.
>>
>> Actually it specifically says "A short term fix should not be generalized
>> to solve other problems." and the TURN draft says
>>
>>>  ...However, care has been taken to
>>>  make sure that TURN is suitable for other types of applications
>>
>> Reading those two statements gave me a little cognitive dissonance.
>> Maybe you can add something like
>>
>> Note that although TURN can be applied beyond the domain of SIP
>> usage, it can only satisfy these limited purposes.
>>
>> However, this isn't a big deal IMHO.
> 
> Speaking for myself, I think that STUN/TURN/ICE is a general approach to
> NAT traversal, and not something just usable by SIP. In this regard, I
> will note that both RELOAD (the peer-to-peer protocol being developed in
> P2PSIP) and HIP now use STUN/TURN/ICE for NAT traversal.
> 
> So I am uncomfortable with adding your suggested sentence, since it
> seems to suggest that TURN can be used only for SIP-related purposes.
> 
> The problem I feel we are wrestling with is that the UNSAF document was
> hoping that either (a) NATs would go away soon, or (b) a better NAT
> traversal solution would soon emerge. Unfortunately, neither of these
> have happened in the years since it was published and neither seem
> likely to happen in the near future.
> 
> Finally, I will note that the only aspect of TURN which can be
> considered "Unilateral Self-Address Fixing" is the inclusion of the
> XOR-MAPPED-ADDRESS in the Allocate response. The value returned in this
> attribute is not used later in the protocol at all -- it is included
> only as a convenience to the client, who would otherwise have to do a
> Binding transaction with a STUN server.
> 
> - Philip
> 
> 

From dthaler@windows.microsoft.com  Fri Apr 10 10:51:07 2009
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From: Dave Thaler 
To: =?iso-8859-1?Q?R=E9mi_Despr=E9s?= 
Date: Fri, 10 Apr 2009 10:51:17 -0700
Thread-Topic: [BEHAVE] FYI: draft-despres-sam-02  enclosed
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Attached is a marked up PDF with my comments.
I'm still having a really hard time understanding this draft.

-Dave

From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On Behalf Of=
 R=E9mi Despr=E9s
Sent: Friday, March 13, 2009 2:57 AM
To: Internet Area; Softwires WG; Behave WG
Subject: [BEHAVE] FYI: draft-despres-sam-02 enclosed

Hi,


For your information, draft-despres-sam-02, which was ready too late to be =
posted before IETF 74, is enclosed below



It is a major update of the version-01 which was presented at IETF 73:

- In Softwires, ref.:

http://www.ietf.org/proceedings/08nov/slides/softwire-3/softwire-3_files/sl=
ide0002.htm

- In Behave, ref.:

http://www.ietf.org/proceedings/08nov/slides/behave-15.pdf



In San Francisco, its part that deals with NAT66 avoidance is to be discuss=
ed at the 6IA BOF meeting (ex NAT66).

Its part that deals with Port-Range extension, is to be discussed at the SH=
ARA BOF.



Comments most welcome.



Regards,



RD






Internet Engineering Task Force                               R. Despres
Internet-Draft                                             November 2008
Intended status: Standards Track
Expires: May 5, 2009


                    Stateless Address Mapping (SAM)
      Avoiding NATs and restoring the end-to-end principle in IPv6
                          draft-despres-sam-02

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on May 5, 2009.

Abstract

   Stateless Address Mapping (SAM) is a generic mechanism to support
   global addressing across network zones where routing is based on a
   different address space.  With it, the end-to-end principle, lost in
   IPv4 with the deployment of NATs, can be restored without losing
   services that NAT44s offer beyond address-space extension (private
   addressing, basic firewall, site multihoming, privacy protection,
   host-rooted subnets).  Global-address packets are encapsulated in
   local-address packets to traverse SAM zones, and global prefixes are
   statelessly mapped into local addresses.  For the IPv6-IPv4
   coexistence period, port-restricted IPv4 addresses are used to extend
   the global IPv4 address space.



Despres                    Expires May 5, 2009                  [Page 1]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


Table of Contents

   1.  Introduction and general problem statement . . . . . . . . . .  3
   2.  NAT44 services availability of which in IPv6 is desirable  . .  4
     2.1.  Private addressing (easy renumbering)  . . . . . . . . . .  4
     2.2.  Basic firewall (by default, no incoming connections) . . .  4
     2.3.  Site multihoming (automatic fallback)  . . . . . . . . . .  4
     2.4.  Privacy protection . . . . . . . . . . . . . . . . . . . .  4
     2.5.  Host-rooted subnets  . . . . . . . . . . . . . . . . . . .  5
   3.  SAM specification  . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Local Zones - Root SAMs - Branch SAMs  . . . . . . . . . .  5
     3.2.  Encapsulation of global packets in local packets . . . . .  7
     3.3.  Global prefixes - global addresses - local addresses . . .  9
     3.4.  Endpoint global address to branch local address mapping  . 11
     3.5.  Privacy protection . . . . . . . . . . . . . . . . . . . . 13
     3.6.  SAM parameters . . . . . . . . . . . . . . . . . . . . . . 15
     3.7.  Port-range-based extended IPv4 addressing  . . . . . . . . 16
   4.  SAM Application examples . . . . . . . . . . . . . . . . . . . 17
     4.1.  Address independence in an IPv6 site . . . . . . . . . . . 17
     4.2.  Multihoming and extended IPv4 addressing in a home site  . 19
   5.  SAM as an alternative to NATs in IPv6  . . . . . . . . . . . . 21
   6.  Security considerations  . . . . . . . . . . . . . . . . . . . 22
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 22
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 23
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 23
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 23
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25
   Intellectual Property and Copyright Statements . . . . . . . . . . 26






















Despres                    Expires May 5, 2009                  [Page 2]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


1.  Introduction and general problem statement

   In IPv4, Network Address Translations have been extensively deployed
   (NAT44s).  They are key to mitigate the IPv4 address shortage.  But
   they also offer various auxiliary services, described in Section 2:
   private addressing, basic firewall, site multihoming, privacy
   protection, host-rooted subnets.

   In counterpart to these auxiliary services, these NAT44s have
   introduced two drawbacks:

   o  Non compliance with the end-to-end principle of the Internet
      (e2e).

         Negative consequences include incompatibility with the IPsec
         security mechanism, and difficulties for hosts to know their
         own global addresses, which they need for connection
         redirections, for host referrals, and and, in sites having
         several site entrance routers, for multihoming support
         mechanisms like the SCTP of [RFC4960] and [Shim6].

   o  Stateful operation.

         Most NAT44s are in fact stateful NAPTs (ref. < xref
         target=3D"RFC2663" />): to support more local addresses than they
         have external addresses, they maintain per-transport-connection
         states.  Negative consequences include limited scalability, and
         the risk of denial of service attacks that go with it, as well
         as single points of failures.

   Since no global address shortage is in view in IPv6, the following
   questions have to be asked:

   o  Which NAT44 services can, in IPv6, be offered statelessly and
      without breaking the e2e principle?

   o  How?

   This draft proposes to answer these questions more completely, and
   with more technical details, than [RFC4864], the most advance
   document on the subject so far.

   For this, a Stateless Address Mapping generic mechanism is introduced
   (SAM).

   Conclusion, is that, provided SAM is supported in nodes at borders of
   independently administered routing zones, the e2e principle can be
   restored in IPv6, for all identified useful functions of NAT44s.



Despres                    Expires May 5, 2009                  [Page 3]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


   (This conclusion needs however to be confirmed after further work on
   SAM details, after criticisms by other experts, after some possible
   bug corrections, and after validations with running code.)

   Thus, traversal of NATs in ISP infrastructures can be avoided.
   (These NATs do provide useful connectivity to some non-SAM-capable
   nodes, but have the drawback of breaking the e2e principle, with the
   mentioned consequences on security, referrals, multihoming,
   scalability and reliability.


2.  NAT44 services availability of which in IPv6 is desirable

2.1.  Private addressing (easy renumbering)

   With NAT44s, when a prefix assigned by an ISPs to a customer site is
   modified, local IP addresses in the site can remain unchanged.

2.2.  Basic firewall (by default, no incoming connections)

   Most NAT44s, being NAPTs, and therefore maintaining states for all
   TCP and UDP connections, have as a byproduct a protection against
   incoming connections (unless some "holes" are "punched" in this
   protection, under explicit customer control).  This level of security
   protection is largely relied upon.

2.3.  Site multihoming (automatic fallback)

   In a site is multi-homed, and if it has a NAT device supporting all
   its ISP interfaces, its hosts can take advantage of multihoming
   without having to support any multihoming-specific function.  This
   level of multihoming support is better than none.

   (For this, a NAT44 needs only to make sure that, for each transport
   connection, all outgoing packets go through the same ISP.  Thus, if
   an ISP access fails, current TCP and UDP connections that go via this
   ISP are broken, but theycan immediately be replaced by new ones.)

2.4.  Privacy protection

   From outside a site where a NAT44 operates in NAPT mode, it is
   difficult to determine which hosts establish which connections.  This
   level of privacy protection, in particular for some web requests, is
   an added value.







Despres                    Expires May 5, 2009                  [Page 4]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


2.5.  Host-rooted subnets

   Behind a host that is assigned a single IPv4 address, it is possible,
   with a NAT44 in the host, to deploy a private subnet.  As modern
   operating systems include a router function with a NAT44, a computer
   can can serve as a root for a LAN.

   Thus, the distinction between hosts and a routers is no longer a
   distinction between types of devices.  It has become only a
   distinction between functions within nodes.


3.  SAM specification

3.1.  Local Zones - Root SAMs - Branch SAMs

   As presented in Figure 1, the SAM mechanism applies to a SAM "local
   zone" Z. Routing within this zone is independently administered, and
   is based on a "local address space".

   Each SAM zone has one or several "root interfaces" (Ri), that give
   access to the global Internet.  Each one has, in the global Internet,
   one or several "global prefixes" (gZij) exclusively assigned to zone
   Z.

   SAM global prefixes can be global IPv6 and/or global IPv4.  SAM local
   address spaces can be IPv6 or IPv4, global or private.  If both IPv4
   and IPv6 are routed in the zone, one of the two is chosen for SAM.
   (SAM is in this respect therefore an extension of the 6to4 of
   [RFC3056], of the ISATAP of [RFC5214], and of [6rd], where all global
   prefixes are IPv6 and all local address spaces are IPv4).

   As explained in Section 3.7, global IPv4 addresses can be extended
   beyond 32 bits to deal with the IPv4 address shortage during the
   IPv4-IPv6 coexistence period.
















Despres                    Expires May 5, 2009                  [Page 5]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


                                         ROOT-SIDE ENDPOINTS
                                      |         /\            |
                                      |         ||            |
                                |_____:_____|   ||     |______:_____|
                                      |                       |
                                      |      ROOT ZONES       |
                                      |                      gZ22
    Zone Global prefixes gZij       gZ11                     gZ21
    Root interfaces:         _________:_______________________:________
                            |(Z)   (root-SAM)              (root-SAM)  |
    Root local addresses:   |         R1                       R2      |
            Ri              |                                          |
                            |                SAM ZONE Z                |
                            |                                          |
                            |                                          |
    Branch local addresses: |      B1               B2           B3   |
            Bk              |      :                :             :    |
    Branch interfaces:      |______:________________:_____________:____|
                                   |                |             |
    Branch Global prefixes:        |          (branch-SAM)        |
      *gBkij=3DgZij.zBk*               =3D> + gB211, gB221, gB222
    Branch Global Addresses:            +  gB211@, gB221@, gB222@
      *gBkij@=3DgBkij.H*                              ||
                               BRANCH ZONES         ||
                                                    \/
                                          BRANCH-SIDE ENDPOINTS

                      ROOT AND BRANCH INTERFACES AND SAMs

                                 Figure 1

   Each root interface that supports a root-SAM function has a local
   address (Rk), and each "branch interface" has a local address (Bk).

   If a "branch SAM" function is supported at a branch interface Bk,
   this interface gets, in addition to its local address, global
   prefixes (gBkij).  Each of these prefixes is made of a global prefix
   of the zone (gZij) followed by an identifier (zBk) of the branch in
   its zone.

   For each each of its global prefixes gBkij, a branch interface has
   also a host global address (gBkij@), derived from the prefix by
   appending a standard host suffix (H) to complete the address length.

   Thus, if a zone D is accessible from the global Internet via a zone
   hierarchy A, B, C, it has at least gA.aB.bC.cD as a global prefix gD,
   and gA.aB.bC.cD.H as a global address gD@.  SAM is thus an
   application of the locator-identifier separation principle.  (It



Despres                    Expires May 5, 2009                  [Page 6]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


   differs however from [LISP], in that no new protocol is needed fro
   SAM, just new options in existing protocols such as DHCP [RFC2131],
   DHCPv6 [RFC3315], or ND [RFC4861], to advertise SAM parameters to
   branch interfaces.)

3.2.  Encapsulation of global packets in local packets


   endpoint Y Global address:                 gY
                                               ^
                                               |
                                              ...
   (3)  e2e packet:                    [ gX->gY [data]]
                                               ^
                                               |
                                              gZ         ROOT ZONE R
                                 ______________:______________________
                                |(Z)       (root SAM)                 |
                                |              R         LOCAL ZONE Z |
                                |              ^                      |
                                |              |                      |
                                |             ...                     |
   (2)  encapsulated packet:    |                                     |
         *B =3D la(gX)*           |      [  B->R [gX->gY[data]]         |
         *R =3D parameter*        |              ^                      |
                                |              |                      |
                                |              B                      |
                                |______________:______________________|
                                          (branch SAM)   BRANCH ZONE B
                                           =3D> + gB
                                               ^
                                               |
                                              ...
   (1)  e2e packet:                    [ gX->gY [data]]
                                               ^
                                               |
   endpoint X Global address:          gX=3DgZ.id(B).xxx


     PACKET ENCAPSULATION AND ADDRESS MAPPING - BRANCH SIDE TO ROOT SIDE

                                 Figure 2

   To traverse a SAM local zone, global-address packets are encapsulated
   into local address packets, as illustrated in Figure 2 and Figure 3).

   Thus, compatibility is ensured, within the local zone, with ingress
   the filtering for multihomed networks of [RFC3704], the basic anti-



Despres                    Expires May 5, 2009                  [Page 7]


Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


   spoofing mechanism.


                                               |
                                               |           ROOT ZONE
                                              gZ
                                 ______________:______________________
                                |(Z)       (root-SAM)                 |
                                |              R         LOCAL ZONE Z |
                                |                                     |
                                |                                     |
                                |                                     |
   (2)  encapsulated packet:    |     [ B1->B2 [gE1->gE2[data]]       |
        *B1 =3D la(gX)*           |         -------->--------           |
        *B2 =3D la(gY)*           |       /                   \         |
                                |      ^                     |        |
                                |      |                     v        |
                                |      B1                    B2       |
                                |______:_____________________:________|
           BRANCH ZONES:          (branch-SAM)          (branch-SAM)
                                    =3D> + gB1              =3D> + gB2
                                       ^                     |
                                       |                     v
   (3)  e2e packet:                   ...              [ E1->E2 [data]]
   (1)  e2e packet:             [ E1->E2 [data]]             ...
                                       ^                     |
                                       |                     v
                               gX=3DgZ.id(B1).xxx         gY=3DgZ.id(B2).yy=
y
                                      _:_                   _:_
                                     | X |                 | Y |
                                     |___|                 |___|

   ADDRESS MAPPING AND PACKET ENCAPSULATION - BRANCH SIDE TO BRANCH SIDE

                                 Figure 3

   For the IP-in-IP encapsulation, the IPv6 next header or the IPv4
   protocol id which indicates the type of IP payload is set to 41 (the
   same value as for 6to4, ISATAP, and 6rd).

   Local addresses are determined as follows (illustrated in figures
   Figure 2 and Figure 3):

   1.  If an endpoint global address gE, indifferently source or
       destination, is that of a branch-side endpoint, this is
       recognized by the fact that it starts with one of the global
       prefixes of the zone.  Then, the local address B is obtained by a
       function B=3Dla(gX), completely determined by SAM parameters of the



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       zone (details in Section 3.4).

   2.  If an endpoint global address gE, indifferently source or
       destination, is that of a root-side endpoint, this is recognized
       by the fact that it doesn't start with any of the global prefixes
       of the zone.  In this case, the other address gX of the packet,
       destination or source respectively, is necessarily that of a
       branch-side endpoint (otherwise the packet would not traverse the
       local zone).  Then, local address Ri is that of the root
       interface that has, in its assigned global prefixes, the global
       prefix present at the beginning of the branch-side address gX.

   In multihomed sites, the second of these rules ensures compatibility
   with the ingress filtering of [RFC3704] in root zones (if it does
   apply, as necessary for anti-spoofing protection).

   In Figure 2 and Figure 3, packets in the reverse direction, not
   shown, would have the same addresses but with sources and
   destinations inverted, and with encapsulations and decapsulations
   made at inverted interfaces.

   Decapsulation functions MUST verify, for anti-spoofing protection,
   that local addresses present in headers of encapsulating packets are
   consistent with global addresses present in headers of encapsulated
   packets.

3.3.  Global prefixes - global addresses - local addresses

   Internal structures of SAM global prefixes, global addresses, and
   local addresses are detailed in Figure 4.

   A branch-interface global prefix necessarily starts with a global
   prefix of the zone Z. Its remaining bits are a "branch identifier" in
   the zone (gBkij =3D gZij.zB).

















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             |<-------------- Branch global address gB@ ------------->|
             |<-------- Branch global prefix gB -------->             |
             |<-- G --><-----  Branch identifier iB ---->             |
              ________________________________________________________
             |  local  |branch|  Subnet |     branch     |   branch   |
             |  zone   |  id  |  index  |      Index     |    Host    |
             |  Global |Format| (option)|                |  endpoint  |
             |  prefix | code |         |                |   suffix   |
             |         |      |         |                | (10...00)  |
             |    G    |   F  |    S    |        I       |     H      |
             |_________|______|_________|________________|____________|
                    _______/   <-- s ---><----- i ------>
                  /               ^                    ^
                 v                |                    |
        Specifies s and b        /                      \
          (option)              |                        \
        Specify F   <-----.-----|--------------------.    \
                           \    |                     \    |
                            \   v                      \   v
                           <-- s --->                 <----- i ------>|
              ________________________________________________________
             |local-address| Subnet  |  next field   |     branch     |
             |   constant  |  index  |   Delimiter   |      index     |
             |    Prefix   |         |   (00...01)   |                |
             |             |         |               |                |
             |       P     |    S    |      D        |        I       |
             |_____________|_________|_______________|________________|
             |<-- subnet prefix zS -->
             |<-------------- Branch local address B ---------------->|


         SAM GLOBAL PREFIXES - GLOBAL ADDRESSES - LOCAL ADDRESSES

                                 Figure 4

   Principles that influence the internal structure of branch
   identifiers proposed for SAM are the following:

   1.  To permit a flexible hierarchy of local zones, branch identifiers
       should be kept rather short.  They should, at least to some
       extent, be proportionate to the maximum number of branches
       supported in their zone.

   2.  Several subnets must be possible in the zone.  For this, a branch
       identifier contain an optional "subnet index" (S), followed the
       "branch index" (I) which identifies the branch in its subnet.
       (The word "index" is chosen to express that these fields have no
       further internal structure.)



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   3.  For the efficiency of routing tables, intra-zone subnet indexes
       have to be in the upper part of local addresses, just behind the
       "constant prefix" (P) that is common to all local addresses.  (In
       IPv6, this constant prefix can typically be an ULA prefix of
       [RFC4193]; in IPv4 is typically a private-address prefix of
       [RFC1918].)

   4.  For efficiency of the neighbor discovery protocol of [RFC2461],
       branch indexes B have on the contrary to be in the lowest part of
       branch local addresses B.

   5.  Consequently, it must be possible to extract separately, from a
       intra-zone branch identifier iB, the subnet index S and the
       interface index I, and for this to know their lengths (s and i).

   6.  In order to permit to configure several subnet-index lengths,
       and/or several interface index lengths, in SAM zones, an optional
       branch-identifier "format code" (F) is placed at the beginning of
       branch identifiers B (just before the optional subnet index S,
       and the branch index B).  Each format codes specifies a subnet-
       index length s and an interface-index length i.  Format codes T
       may have different lengths, but must be non overlapping prefixes
       to be recognized.

   Since the local address B of a branch interface starts with a
   constant prefix P followed by the interface subnet index S , and is
   terminated by the interface-index of the interface, space is left
   between them.  It is filled with a next-field delimiter (D).  Its
   format, a series of 0s followed by a 1, i.e. 00...01 with a minimal
   length of 1 bit, is chosen so that knowing the constant prefix P and
   the subnet prefix of a branch interface, lengths s and i of the its
   subnet index S and of its interface index I can be determined.  Then,
   the identifier format F to be placed in global prefixes of B can be
   derived from these lengths s and i.

3.4.  Endpoint global address to branch local address mapping

   Detailed steps by which a branch local address B is derived from from
   the global address of a branch-side endpoint are presented in
   Figure 5.











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              ________________________________________________________
             |                  Endpoint Global address               |
             |                             gE                         |
             |________________________________________________________|
                           (A) ANALYSIS    ||
                                           \/
              ___________________________________________ ............
             | Global  |  id  |  Subnet |     branch     | endpoint   :
             | prefix  |Format|  index  |      Index     |  suffix    :
             |    G    |   F  |    S    |        I       |     E      :
             |_________|______|_________|________________|............:
                       |   |       |            |
     1. Match found    |   |       |            |
     in the G list  ___|   |       |            |
                           |       |            |
     2. Match found        |       |            |
     in the F list   ______|       |            |
                                   |            |
     3. length defined by F _______|            |
                                   .            |
     4. length defined by F ____________________|
                                   .            .
                 (B) CONSTRUCTION  .     ||     .
                                   .     \/     .
     5. The current                .            .
     local-address prefix __       .            .
                            |      .            .
     6. From step 3. _______:______.__          .
                            |         |         .
     7. From step 4. _______:_________:_________.__________
                            |         |                    |
     8. Binary 00...01 _____:_________:________            |
                            |         |        |           |
              ______________|_________|________|___________|__________
             |  local-address  | Subnet  |next field |     branch     |
             |     Prefix      |  index  | Delimiter |      Index     |
             |         P       |    S    |    D      |        I       |
             |_________________|_________|___________|________________|
             |<--------------- Branch Local address B --------------->|

        DERIVING A BRANCH LOCAL ADDRESS FROM AN ENDPOINT GLOBAL ADDRESS

                                 Figure 5








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3.5.  Privacy protection

   In a zone where privacy protection is desired, the privacy option can
   be turned on.  Principles of this option are the following:

   o  Fields that identify branch-side IP endpoints in privacy protected
      zones, or transport endpoints if endpoints are at this layer, are
      obfuscated in e2e packets that traverse the the global Internet.

   o  This obfuscation is stateless and reversible.

   o  Branch SAMs of a privacy-protected zone are informed of parameters
      of this obfuscation.  They can thus know which "hidden" addresses
      (or addresses plus ports), appear on the global Internet in place
      of their "clear" addresses (or address plus ports).  These clear
      addresses are those from which local addresses are derived in the
      privacy-protected zone and in zones that are lower in the
      hierarchy.

   o  In these lower zones, all branch SAMs are informed that a root SAM
      in the global-Internet direction has activated a privacy option,
      and are informed of parameters of this option.  They can thus
      derive a clear address (or address plus port) from an obfuscated
      address (or address plus port), and conversely.  They can also
      avoid to activate the privacy so that obfuscation is never done
      more than once.

   Parameters of a privacy option are a privacy global prefix (PPm) and
   a scrambling multiplier (PMm).  The prefix is that which, at the
   beginning of global addresses, is not obfuscated in the global
   Internet.  The multiplier is a 64 bit odd constant.

   Obfuscation consists in a modulo 2^n multiplication by the scrambling
   multiplier, where n is the number of bits to be obfuscated.  De-
   obfuscation is the modulo 2^n multiplication by the inverse of the
   scrambling multiplier (for odd numbers, such an inverse modulo 2^n
   always exists).

   In hosts in which the branch SAM is informed of an active privacy
   option, applications that ask for their address and their port at
   their socket interface, get them in hidden form, that which appears
   in the global Internet.  The e2e principle is thus preserved despite
   the fact that the topology of the privacy-protected zone and that of
   lower zones in the hierarchy are all hidden, and despite the fact
   that successive transport connections from a same host cannot, in the
   global Internet, be related to a single host.

   Ports that are concerned with the privacy option are only the IANA



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   defined dynamic and/or private ports (ports 49152 to 65535, those
   starting with binary 11).  Well known ports and registered ports,
   which have an e2e meaning not to be lost must not be obfuscated.

   Since some applications, e.g. active mode FTP of [RFC0959], work on
   port pairs rather than on individual ports, port bits to be
   obfuscated must exclude the las one.  Port bits that are part of
   obfuscated endpoint identifiers are then bits 2 to 14.



                                            gY
                                             ^
                                             |
                                            ...
    e2e packet:              gZ11.F2.hhhh->gY [TCP hh->80 [data]]
                                             ^
                                             |
                                           gZkij         ROOT ZONE R
                  ___________________________:________________________
                 |(Z)             .--> (root SAM)                     |
    Privacy-option ON            /           Rk                       |
    for prefix PP1 =3D gZkij.F1 ---'           ^          LOCAL ZONE Z  |
    with multiplier PM1                      |                        |
                 |                           |                        |
                 |                          ...                       |
    encapsulated |   [ B->R [ gZkij.cccc->gY [TCP cc->80 [data]]      |
       packet    |                                                    |
                 |                           ^                        |
                 |                           |                        |
                 |                           B                        |
                 |___________________________:________________________|
                                        (branch SAM)
    Clear-address packet:        gZkij.F1.cccc->gY [TCP cc->80 [data]]
    e2e packet:                  gZkij.F1.hhhh->gY [TCP hh->80 [data]]
       where tmp =3D modulo 2^m (PM1 x (cccc . (bits 2 to 14 of cc))
                   where m =3D length of cccc + length of cc - 3
             hhhh =3D bits 0 to (length of hhhh - 1) of tmp
             hh =3D cc in which bits 2-15 are replaced by
                  bits(length of PP1 TO m - 1) of tmp .

                           SAM PRIVACY OPTION ILLUSTRATION

                                 Figure 6

   Figure 6 illustrates the effect of the privacy option.  The option is
   supposed to be on, in the root SAM of the zone, for its global prefix
   gZkij and its identifier format F1.  The privacy-option prefix is



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   therefore PP1 =3D gZ11.F2. the scrambling multiplie ris PM1.

3.6.  SAM parameters

   Table 3 to Table 5 of this section present the complete set of SAM
   parameters described in previous sections.

                      +-----------------------+-----+
                      | constant local Prefix | TTL |
                      +-----------------------+-----+
                      |          ...          | ... |
                      |           Pm          | PTm |
                      |          ...          | ... |
                      +-----------------------+-----+

                        CONSTANT PREFIX PARAMETERS

                                  Table 1

   +--------------------+-----+------------------+---------------------+
   |  identifier Format | TTL |   Subnet-index   |   Interface-index   |
   |        code        |     |      Length      |        Length       |
   +--------------------+-----+------------------+---------------------+
   |         ...        | ... |        ...       |         ...         |
   |         Fn         | FTn |        SLn       |         ILn         |
   |         ...        | ... |        ...       |         ...         |
   +--------------------+-----+------------------+---------------------+

                       IDENTIFIER-FORMAT PARAMETERS

                                  Table 2

   +-----------------+-----+---------------+-----+---------------+-----+
   |    Root local   | TTL | Global Prefix | ... | Global Prefix | ... |
   |     address     |     |       1       |     |       j       |     |
   +-----------------+-----+---------------+-----+---------------+-----+
   |       ...       | ... |      ...      | ... |      ...      | ... |
   |        Ri       | RTi |      gZi1     | ... |      gZij     | ... |
   |       ...       | ... |      ...      | ... |      ...      | ... |
   +-----------------+-----+---------------+-----+---------------+-----+

                              ROOT PARAMETERS

                                  Table 3







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                       +--------------------+------+
                       | Global zone prefix |  TTL |
                       +--------------------+------+
                       |         ...        |  ... |
                       |        gZij        | GTij |
                       |         ...        |  ... |
                       +--------------------+------+

                         GLOBAL-PREFIX PARAMETERS

                                  Table 4

        +-----------------------+-----+---------------------------+
        | Privacy-option Prefix | TTL | Privacy-option Multiplier |
        +-----------------------+-----+---------------------------+
        |          ...          | ... |            ...            |
        |          PPp          | PTp |            PMp            |
        |          ...          | ... |            ...            |
        +-----------------------+-----+---------------------------+

                         PRIVACY-OPTION PARAMETERS

                                  Table 5

3.7.  Port-range-based extended IPv4 addressing

   For a dual stack host not to break the e2e principle when it
   establishes a connection with an remote endpoint that is still only
   reachable in IPv4, it must have a global IPv4 address.  Because of
   the IPv4 address shortage, this address may however be shared with
   other hosts.  For this, SAM accepts "port-extended" IPv4 prefixes,
   longer than 32 bits.  Bits beyond the first 32 define a port range in
   the set of dynamic and/or private ports (those in which the two high
   order bits are binary 11).  For example, a 3-bit prefix extension 010
   imposes that branch-side hosts use only ports starting with binary
   11010.

   Note that, due to the systematic encapsulation of global packets in
   local packets of SAM, routing within SAM zones is not concerned with
   theses "port-extended" IPv4 addresses.  Only root SAMs and branch
   SAMs have to know about of port ranges.

   The branch SAM in a host that is assigned a port-restricted IPv4
   address has to inform its socket interface of the port range
   available to applications, and to inform its internal NAT if it has
   one.  Consequences for applications, and for NATs, of restricted port
   ranges, are out of the scope of this SAM specification.  Other
   documents are available on the subject, e.g.  [Boucadair], which



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   however requires further study.


4.  SAM Application examples

4.1.  Address independence in an IPv6 site

   In the example of Figure 7, we consider a home or SOHO site in which
   an Ethernet and/or WiFi LAN is deployed.  Its global IPv6 prefix gZ
   is 2001:0db8:9999::/48.

   Local addressing is done in an IPv6 private space.  To keep address
   shorts in the figure, the constant prefix of these addresses is
   fc00/8, the shortest prefix reserved for private IPv6 addressing in
   [RFC4193].  (This prefix could however be replaced by a full fdxx:
   xxxx:xxxx::/48 prefix, as recommended in [RFC4193] for ULAs, without
   changing the substance of the example.)

   The site is configured to support 255 branch interfaces on the LAN
   (each branch being indifferently a host and/or a router).  To
   facilitate future changes, a branch-identifier format code F1, set to
   0/4, is used in branch global prefixes.

   SAM parameters of the site are then following (ignoring TTLs):

      Constant local prefix: P1 =3D fc00/8

      Identifier format code: F1 =3D 0::/4

      Subnet index length: SL1 =3D 0 (non applicable)

      Interface index length: IL1 =3D 8

      Root local address: R1 =3D fc00::0101

      Zone Global prefix: gZ11 =3D 2001:0db8:9999::/48

      Privacy option prefix: none in this example

   We now consider a SAM-capable PC which serves as a router for a
   bluetooth link.  On this link, a bluetooth mobile phone is active.
   (Configuring a root-SAM in the PC would permit the mobile phone, if
   acting as a SAM-capable router, to assign global prefixes and
   addresses, to hosts behind it.  But this would have been too much for
   the example).






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                                          |
                                          |
                                  2001:0db8:9999::/48
                         _________________:_________________
                        |(Z)       (root SAM) for 2^8 hosts |
                Site    |            fc00::0101             |
               gateway  |                                   |
                        |                                   |
                        |            fc00::0155             |
                        |_________________:_________________|
                                          |
                 Ethernet and/or WiFi    ...
                      fcOO::/64           |

                                      fc00::0155
                                     (branch SAM)
                             =3D> +  2001:0db8:9999:0550::/60
                                __________:__________
                               |2001:0db8:9999:0558::|
               PC              |                     |
                               |_____________________|
                              /___________._________/
                                          |
                  Bluetooth              ...
               2001:0db8:9999:0550::/64   |
                                          |
                            2001:0db8:9999:0550:< eui64 IID >
                                          |
                                        |_|__
                                       |     |
               Mobile phone            |     |
                                       |     |
                                       |_____|

                                 Figure 7

   The PC local address B is fc00::0155, i.e.  P.D.I where P is
   fc00::/8, where the 8 bits of I are supposed to be 55::/8, and where
   D is binary 00...01 with consequently (128 - 8 -8) =3D 112 bits.

   The PC global prefix gB is therefore 2001:0db8:9999:0550::/60, i.e.
   G.F.I, where G is 2001:0db8:9999::/48, where F is 0::/4, and where I
   is 55::/8.

   The PC global address is therefore 2001:0db8:9999:0558::, i.e. gB.E
   where E is binary 10...00 with (128 - 48 - 4 - 8) =3D 68 bits.

   The bluetooth link is supposed to have 0::/4 as subnet ID in the PC.



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   Its /64 subnet prefix is therefore 2001:0db8:9999:0550::/64.

   This simple example illustrates how the SAM logic permits to
   establish a hierarchy of routing zones where each host can become a
   router, and where the e2e principle is preserved.

4.2.  Multihoming and extended IPv4 addressing in a home site

   In the example of Figure 8, we consider a home site S, multihomed
   with two ISPs A and B.

   ISP A assigns to the site IPv6 prefix 2001:1111:1111:1110::/60, and
   IPv4 address 192.0.2.1.

   ISP B can only assign port-restricted IPv4 addresses to its sites
   because it has to support up to 2^16 sites, and has only for this an
   IPv4 /18 prefix (namely 198.16.0.0/18, i.e. v4|c610:0000:/18), and
   since 18 + 16 =3D 34 which exceeds 32.  Having 2001:0db8::/32 as its
   IPv6 prefix, it assigns /48s to its customer sites, in particular
   2001:0db8:0202::/48 to site S.

   Half of its IPv4 address space, namely v4|c608:c000/19 is allocated
   to a NAT to support sites that are not SAM capable.  The other half,
   i.e. v4|c610:2000/19, is allocated to a root SAM, the local address
   of which is supposed to be 2001:0db8::1.

   SAM parameters of the zone of ISP B are then the following:

      Constant local prefix: P1 =3D 2001:0db8: =3D v4|a000::/8

      Identifier format code: F1 =3D ::/0 (non applicable)

      Subnet index length: SL1 =3D 0 (non applicable)

      Interface index length: IL1 =3D 16

      Root local address: R1 =3D 2001:0db8::1:1

      Zone Global prefix: gZ11 =3D v4|c608:8000/19 (=3D198.8.128.0/19).

      Privacy option prefix: none in this example (::/0)










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                                                      198.16.0.0/18
                                2001:0db8::/32       =3Dv4|c610:0000:/18
                                  ____|__________________|____________
                                 |(B)             /            \      |
                                 |               |    v4|c610:2000/19 |
                                 |          v4|c608:c000/19      |    |
                                 |             (NAT)       (root SAM) |
                                 |         0.0.0.0/0     2001:0db8::1 |
     |(A)                     |  |                                    |
     |                        |  |                                    |
     |2001:1111:1111:1110::/60|  |   (2^16 SAM sites)                 |
     |       192.0.2.1        |  |                                    |
     |      =3Dv4|c000:0201/32  |  |      2001:0db8:0202::/48           |
     |________________:_______|  |___________________:________________|
                      |                      (branch SAM)
                      |           =3D> + v4|c610:2040:4000::/35
                      |              =3D 198.8.128.64/ports 11010...
      ________________:______________________________:________________
     |(S)     /               \               /              \        |
     |       |     v4|c000:0201:0000::/33    |  v4|c610:2040:4000::/36|
     |       |                 ::/0          |                 ::/0   |
     | v4|c600:0201:8000::/33   |     v4|c608:2040:6000::/36    |     |
     |     (NAT)            (root SAM)     (NAT)          (root SAM)  |
     |   0.0.0.0/0          fc00::0011    0.0.0.0/0       fc00::0012  |
     |                                                                |
     | (2^4 SAM hosts)                                                |
     |                        fc00::0018                              |
     |_____________________________:__________________________________|
                                   |
           HOST (H)           (branch SAM)
                    =3D> + 2001:1111:1111:1118:8000::0008/64
                       + 2001:0db8:0220:4800::0008/52
           + v4|c000:0201:4000::/37 =3D 192.0.2.1 ports 1101000...
           + v4|c610:2040:5000::/40 =3D 198.16.32.64 ports 1101001000...
                                  :
                                  HOST

       PRIVATE-ADDRESSING- AND DUAL-HOMING- SITE WITH E2E CAPABILITY

                                 Figure 8

   In site S, the branch SAM of its root interface with ISP B derives
   from its IPv6 prefix 2001:0db8:O2O2::/48, and from SAM parameters of
   ISP B, its IPv4 prefix v4|c610:2040:4000::/35, which is a port-
   restricted one.

   Two root SAMs are configured in site S. Its local-address constant
   prefix is fc00::/8 as.  Half of the each available IPv4 addressing



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   space is reserved for a NAT, and the other half for a root SAM.

   Parameters of SAMs of site S are then the following:

      Constant local prefix: P1 =3D fc00/8

      Identifier format code: F1 =3D 0::/4

      Subnet index length: SL1 =3D 0

      Interface index length: IL1 =3D 8

      Root local addresses: R1 =3D fc00::0011; R2 =3D fc00::0012

      Zone Global prefixes: gZ11 =3D 2001:1111:1111:1110::/60; gZ12 =3D v4|
      c000:0201/32; gz21 =3D 2001:0db8:0202::/48; gZ22 =3D v4|
      c610:2040:4000::/35

      Privacy option prefix: none in this example (::/0)

   Among the 16 hosts of home site S, Host H is supposed to have local
   address fc00::0018.  As shown on the figure, the branch SAM of host H
   then derives from this local address two IPv6 global prefixes, two
   IPv6 global host addresses starting with these prefixes, and two
   port-restricted IPv4 prefixes.  With these prefixes, it can use,
   without breaking the e2e principle, 512 ports for connections via ISP
   A, and 64 ports via ISP B.


5.  SAM as an alternative to NATs in IPv6

   With SAM as specified, all NAT44 services that have been listed in
   Section 2 can be offered in IPv6 without stateful processing and
   without breaking the e2e principle:

   1.  In a private-addressing IPv6 site, hosts can know their global
       addresses to use them in e2e packets that are encapsulated in
       local packets to traverse the site.  Renumbering is then
       automated simply by automating advertisement of SAM parameter
       changes (in DHCP and/or with router advertisements).

   2.  The fact that NAT44s are in general configured with by default
       rejection of all incoming calls can have a simple stateless
       equivalent in IPv6:

       *  By default, reject all incoming packets that have a branch-
          side port in the well known or in the IANA defined registered
          port ranges.



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       *  By default, reject all TCP incoming packets that are attempts
          to open new incoming connections (SYN packets without ACK).

   3.  In a SAM-capable site, SAM-capable hosts can take advantage of
       site multihoming with full compatibility with ingress filtering
       of [RFC3704] in both the site itself and in ISP networks to which
       it is connected.

   4.  The privacy protection described in Section 3.5 maintains the e2e
       principle.  It is expected to be largely sufficient in practice.
       (Sophisticated hackers would probably find ways around it, and
       identify who does what in sites havin the privacy-protection
       option, but NAT44s are not perfect for privacy protection
       either).

   5.  As we have seen, SAM global addresses contain a flexible
       succession of branch identifiers, so that it becomes possible to
       set up a flexible hierarchy of private addressing zones.  In
       particular, host-rooted subnets become possible without breaking
       the e2e principle.

   For information, no intellectual property right has been applied for
   by the author on any of SAM mechanisms.  The intent is to facilitate
   IPv6 deployment with new mechanisms that still enhance its potential.


6.  Security considerations

   Like any function where some parameters have to be configured, SAM
   introduces a risk of human errors.

   Besides that, no security risk introduced by SAM has so far been
   identified.  In particular:

   Provided consistency between local addresses present in encapsulating
   packets and global addresses present in encapsulated packets are
   systematic, no more address spoofing is possible than without SAM.

   Due to the stateless operation of SAM, its scalability is high.
   Prevention against denial of service attacks should therefore remain
   easy even for very intense traffic (e.g. using load balancers in
   front of parallel devices).


7.  IANA Considerations

   If and when this specification is stabilized and approved, option
   codes in DHCP, DHCPv6, and ND will have to be defined to



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   automatically convey SAM parameters to branch SAMs.


8.  Acknowledgements

   As this specification has evolved during many months, precious
   encouragement and remarks were received from Mark Townsley.  He has
   to be warmly thanked for it.  Concerning what SAM can bring to port-
   restricted IPv4 addresses, stimulating discussions with Dan Wing,
   Teemu Savolainen, Gabor Bajko, Pierre Levis, Jean-Luc Grimault, and
   Alain Villefranque, have influenced progress of the work.  Gratitude
   is due to them for this.  Challenging remarks, and a few (deserved)
   criticisms from Alain Durand have also helped to better analyze how
   SAM will coexist with NATs.  He deserves credit for it.


9.  References

9.1.  Normative References

   [RFC1918]  Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and
              E. Lear, "Address Allocation for Private Internets",
              BCP 5, RFC 1918, February 1996.

   [RFC2131]  Droms, R., "Dynamic Host Configuration Protocol",
              RFC 2131, March 1997.

   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
              and M. Carney, "Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 3315, July 2003.

   [RFC4193]  Hinden, R. and B. Haberman, "Unique Local IPv6 Unicast
              Addresses", RFC 4193, October 2005.

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              September 2007.

9.2.  Informative References

   [6rd]      Despres, R., "IPv6 Rapid Deployment on IPv4
              infrastructures (6rd) - Work in progress
              (draft-despres-6rd-02)", October 2008.

   [Boucadair]
              Boucadair, M., Grimault, J-L., Levis, P., and A.
              Villefranque, "Behaviour of BitTorrent service in an IP
              Shared Address Environment



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              (draft-boucadair-behave-bittorrent-portrange-02 - work in
              progress)", january 2009.

   [LISP]     Farinaci, D., Fuller, V., Oran, D., Meyer, D., and S.
              Brim, "Locator/ID Separation Protocol (LISP) -
              draft-farinacci-lisp-09", December 2008.

   [RFC0959]  Postel, J. and J. Reynolds, "File Transfer Protocol",
              STD 9, RFC 959, October 1985.

   [RFC2461]  Narten, T., Nordmark, E., and W. Simpson, "Neighbor
              Discovery for IP Version 6 (IPv6)", RFC 2461,
              December 1998.

   [RFC2663]  Srisuresh, P. and M. Holdrege, "IP Network Address
              Translator (NAT) Terminology and Considerations",
              RFC 2663, August 1999.

   [RFC3056]  Carpenter, B. and K. Moore, "Connection of IPv6 Domains
              via IPv4 Clouds", RFC 3056, February 2001.

   [RFC3286]  Ong, L. and J. Yoakum, "An Introduction to the Stream
              Control Transmission Protocol (SCTP)", RFC 3286, May 2002.

   [RFC3582]  Abley, J., Black, B., and V. Gill, "Goals for IPv6 Site-
              Multihoming Architectures", RFC 3582, August 2003.

   [RFC3704]  Baker, F. and P. Savola, "Ingress Filtering for Multihomed
              Networks", BCP 84, RFC 3704, March 2004.

   [RFC4219]  Lear, E., "Things Multihoming in IPv6 (MULTI6) Developers
              Should Think About", RFC 4219, October 2005.

   [RFC4301]  Kent, S. and K. Seo, "Security Architecture for the
              Internet Protocol", RFC 4301, December 2005.

   [RFC4864]  Van de Velde, G., Hain, T., Droms, R., Carpenter, B., and
              E. Klein, "Local Network Protection for IPv6", RFC 4864,
              May 2007.

   [RFC4960]  Stewart, R., "Stream Control Transmission Protocol",
              RFC 4960, September 2007.

   [RFC5214]  Templin, F., Gleeson, T., and D. Thaler, "Intra-Site
              Automatic Tunnel Addressing Protocol (ISATAP)", RFC 5214,
              March 2008.

   [Shim6]    Nordmark, E. and M. Bagnulo, "Shim6: Level 3 Multihoming



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Internet-Draft     Stateless  Address  Mapping  (SAM)      November 2008


              Shim Protocol for IPv6 - Work in progress
              (draft-ietf-shim6-failure-detection-09)", October 2007.

   [draft-carpenter-renum-needs-work-01]
              Carpenter, B., Atkinson, R., and H. Flinck, "Renumbering
              still needs work - Work in progress", December 2008.

   [shim6 fail detec]
              Arkko, J. and I. van Beijnum, "Failure Detection and
              Locator Pair Exploration Protocol for IPv6 Multihoming -
              Work in progress (draft-ietf-shim6-failure-detection-09)",
              July 2007.


Author's Address

   Remi Despres
   3 rue du President Wilson
   Levallois,
   France

   Email: remi.despres@free.fr





























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Full Copyright Statement

   Copyright (C) The IETF Trust (2008).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
   THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.











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--_000_E9CACA3D8417CE409FE3669AAE1E5A4F11EADE34E9NAEXMSGW601wi_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
















Attached is a marked up PDF with my comments.



I’m still having a really hard time understanding this
draft.



 



-Dave



 



In San Francisco, its part that deals with NA=
T66 avoidance is to be discussed at the 6IA BOF meeting (ex NAT66).
Its part that deals with Port-Range extension, is to be discu=
ssed at the SHARA BOF.
 
Com=
ments most welcome. 
 
Regar=
ds,
 
RD















Internet Engineering Task Force       &n=
bsp;            =
;          
R. Despres

Internet-Draft          &=
nbsp;           &nbs=
p;            &=
nbsp;        
November 2008

Intended status: Standards Track

Expires: May 5, 2009





            &nb=
sp;      
Stateless Address Mapping (SAM)

      Avoiding NATs and restoring the end-to-end
principle in IPv6

            &nb=
sp;            
draft-despres-sam-02



Status of this Memo



   By submitting this Internet-Draft, each author represents that=
 any

   applicable patent or other IPR claims of which he or she is aw=
are

   have been or will be disclosed, and any of which he or she bec=
omes

   aware will be disclosed, in accordance with Section 6 of BCP 7=
9.



   Internet-Drafts are working documents of the Internet Engineer=
ing

   Task Force (IETF), its areas, and its working groups.  No=
te
that

   other groups may also distribute working documents as Internet=
-

   Drafts.



   Internet-Drafts are draft documents valid for a maximum of six
months

   and may be updated, replaced, or obsoleted by other documents =
at
any

   time.  It is inappropriate to use Internet-Drafts as
reference

   material or to cite them other than as "work in
progress."



   The list of current Internet-Drafts can be accessed at

   http://=
www.ietf.org/ietf/1id-abstracts.txt.



   The list of Internet-Draft Shadow Directories can be accessed =
at

   http://www.ietf.or=
g/shadow.html.



   This Internet-Draft will expire on May 5, 2009.



Abstract



   Stateless Address Mapping (SAM) is a generic mechanism to supp=
ort

   global addressing across network zones where routing is based =
on a

   different address space.  With it, the end-to-end princip=
le,
lost in

   IPv4 with the deployment of NATs, can be restored without losi=
ng

   services that NAT44s offer beyond address-space extension (pri=
vate

   addressing, basic firewall, site multihoming, privacy protecti=
on,

   host-rooted subnets).  Global-address packets are
encapsulated in

   local-address packets to traverse SAM zones, and global prefix=
es
are

   statelessly mapped into local addresses.  For the IPv6-IP=
v4

   coexistence period, port-restricted IPv4 addresses are used to
extend

   the global IPv4 address space.







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Table of Contents



   1.  Introduction and general problem statement . . . . . =
. .
. . .  3

   2.  NAT44 services availability of which in IPv6 is
desirable  . .  4

     2.1.  Private addressing (easy renumbering)&n=
bsp;
. . . . . . . . . .  4

     2.2.  Basic firewall (by default, no incoming
connections) . . .  4

     2.3.  Site multihoming (automatic fallback)&n=
bsp;
. . . . . . . . . .  4

     2.4.  Privacy protection . . . . . . . . . . =
. .
. . . . . . . .  4

     2.5.  Host-rooted subnets  . . . . . . .=
 . .
. . . . . . . . . .  5

   3.  SAM specification  . . . . . . . . . . . . . . .=
 . .
. . . . .  5

     3.1.  Local Zones - Root SAMs - Branch SAMs&n=
bsp;
. . . . . . . . . .  5

     3.2.  Encapsulation of global packets in loca=
l
packets . . . . .  7

     3.3.  Global prefixes - global addresses - lo=
cal
addresses . . .  9

     3.4.  Endpoint global address to branch local
address mapping  . 11

     3.5.  Privacy protection . . . . . . . . . . =
. .
. . . . . . . . 13

     3.6.  SAM parameters . . . . . . . . . . . . =
. .
. . . . . . . . 15

     3.7.  Port-range-based extended IPv4
addressing  . . . . . . . . 16

   4.  SAM Application examples . . . . . . . . . . . . . . =
. .
. . . 17

     4.1.  Address independence in an IPv6 site . =
. .
. . . . . . . . 17

     4.2.  Multihoming and extended IPv4 addressin=
g in
a home site  . 19

   5.  SAM as an alternative to NATs in IPv6  . . . . .=
 . .
. . . . . 21

   6.  Security considerations  . . . . . . . . . . . .=
 . .
. . . . . 22

   7.  IANA Considerations  . . . . . . . . . . . . . .=
 . .
. . . . . 22

   8.  Acknowledgements . . . . . . . . . . . . . . . . . . =
. .
. . . 23

   9.  References . . . . . . . . . . . . . . . . . . . . . =
. .
. . . 23

     9.1.  Normative References . . . . . . . . . =
. .
. . . . . . . . 23

     9.2.  Informative References . . . . . . . . =
. .
. . . . . . . . 23

   Author's Address . . . . . . . . . . . . . . . . . . . . . . .=
 . .
25

   Intellectual Property and Copyright Statements . . . . . . . .=
 . .
26













































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1.  Introduction and general problem statement



   In IPv4, Network Address Translations have been extensively
deployed

   (NAT44s).  They are key to mitigate the IPv4 address
shortage.  But

   they also offer various auxiliary services, described in Secti=
on
2:

   private addressing, basic firewall, site multihoming, privacy<=
br>
   protection, host-rooted subnets.



   In counterpart to these auxiliary services, these NAT44s have<=
br>
   introduced two drawbacks:



   o  Non compliance with the end-to-end principle of the
Internet

      (e2e).



         Negative consequences incl=
ude
incompatibility with the IPsec

         security mechanism, and
difficulties for hosts to know their

         own global addresses, whic=
h
they need for connection

         redirections, for host
referrals, and and, in sites having

         several site entrance rout=
ers,
for multihoming support

         mechanisms like the SCTP o=
f
[RFC4960] and [Shim6].



   o  Stateful operation.



         Most NAT44s are in fact
stateful NAPTs (ref. < xref

         target=3D"RFC2663&quo=
t;
/>): to support more local addresses than they

         have external addresses, t=
hey
maintain per-transport-connection

         states.  Negative
consequences include limited scalability, and

         the risk of denial of serv=
ice
attacks that go with it, as well

         as single points of failur=
es.



   Since no global address shortage is in view in IPv6, the follo=
wing

   questions have to be asked:



   o  Which NAT44 services can, in IPv6, be offered stateles=
sly
and

      without breaking the e2e principle?



   o  How?



   This draft proposes to answer these questions more completely,=
 and

   with more technical details, than [RFC4864], the most advance<=
br>
   document on the subject so far.



   For this, a Stateless Address Mapping generic mechanism is
introduced

   (SAM).



   Conclusion, is that, provided SAM is supported in nodes at bor=
ders
of

   independently administered routing zones, the e2e principle ca=
n be

   restored in IPv6, for all identified useful functions of NAT44=
s.







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Internet-Draft     Stateless  Address 
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   (This conclusion needs however to be confirmed after further w=
ork
on

   SAM details, after criticisms by other experts, after some
possible

   bug corrections, and after validations with running code.)



   Thus, traversal of NATs in ISP infrastructures can be avoided.=


   (These NATs do provide useful connectivity to some non-SAM-cap=
able

   nodes, but have the drawback of breaking the e2e principle, wi=
th
the

   mentioned consequences on security, referrals, multihoming,
   scalability and reliability.





2.  NAT44 services availability of which in IPv6 is desirable



2.1.  Private addressing (easy renumbering)



   With NAT44s, when a prefix assigned by an ISPs to a customer s=
ite
is

   modified, local IP addresses in the site can remain unchanged.=




2.2.  Basic firewall (by default, no incoming connections)



   Most NAT44s, being NAPTs, and therefore maintaining states for=
 all

   TCP and UDP connections, have as a byproduct a protection agai=
nst

   incoming connections (unless some "holes" are
"punched" in this

   protection, under explicit customer control).  This level=
 of
security

   protection is largely relied upon.



2.3.  Site multihoming (automatic fallback)



   In a site is multi-homed, and if it has a NAT device supportin=
g
all

   its ISP interfaces, its hosts can take advantage of multihomin=
g

   without having to support any multihoming-specific function.&n=
bsp;
This

   level of multihoming support is better than none.



   (For this, a NAT44 needs only to make sure that, for each
transport

   connection, all outgoing packets go through the same ISP. =
;
Thus, if

   an ISP access fails, current TCP and UDP connections that go v=
ia
this

   ISP are broken, but theycan immediately be replaced by new one=
s.)



2.4.  Privacy protection



   From outside a site where a NAT44 operates in NAPT mode, it is=


   difficult to determine which hosts establish which
connections.  This

   level of privacy protection, in particular for some web reques=
ts,
is

   an added value.















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Internet-Draft     Stateless  Address 
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2.5.  Host-rooted subnets



   Behind a host that is assigned a single IPv4 address, it is
possible,

   with a NAT44 in the host, to deploy a private subnet.  As
modern

   operating systems include a router function with a NAT44, a
computer

   can can serve as a root for a LAN.



   Thus, the distinction between hosts and a routers is no longer=
 a

   distinction between types of devices.  It has become only=
 a

   distinction between functions within nodes.





3.  SAM specification



3.1.  Local Zones - Root SAMs - Branch SAMs



   As presented in Figure 1, the SAM mechanism applies to a SAM
"local

   zone" Z. Routing within this zone is independently
administered, and

   is based on a "local address space".



   Each SAM zone has one or several "root interfaces" (=
Ri),
that give

   access to the global Internet.  Each one has, in the glob=
al
Internet,

   one or several "global prefixes" (gZij) exclusively
assigned to zone

   Z.



   SAM global prefixes can be global IPv6 and/or global IPv4.&nbs=
p;
SAM local

   address spaces can be IPv6 or IPv4, global or private.  I=
f
both IPv4

   and IPv6 are routed in the zone, one of the two is chosen for =
SAM.

   (SAM is in this respect therefore an extension of the 6to4 of<=
br>
   [RFC3056], of the ISATAP of [RFC5214], and of [6rd], where all
global

   prefixes are IPv6 and all local address spaces are IPv4).



   As explained in Section 3.7, global IPv4 addresses can be exte=
nded

   beyond 32 bits to deal with the IPv4 address shortage during t=
he

   IPv4-IPv6 coexistence period.

































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            &nb=
sp;            =
            &nb=
sp;  
ROOT-SIDE ENDPOINTS

            &nb=
sp;            =
            
|        
/\            |

            &nb=
sp;            =
            
|         ||    =
;       
|

            &nb=
sp;            =
      
|_____:_____|   ||     |______:_____|

            &nb=
sp;            =
            
|            &n=
bsp;         
|

            &nb=
sp;            =
            
|      ROOT ZONES     &nb=
sp;
|

            &nb=
sp;            =
            
|            &n=
bsp;        
gZ22

    Zone Global prefixes
gZij      
gZ11            =
;        
gZ21

    Root
interfaces:        
_________:_______________________:________

            &nb=
sp;            =
  
|(Z)  
(root-SAM)           =
;  
(root-SAM)  |

    Root local addresses:  
|        
R1            &=
nbsp;         
R2      |

           
Ri            &=
nbsp;
|            &n=
bsp;            =
;            &n=
bsp;   
|

            &nb=
sp;            =
  
|            &n=
bsp;  
SAM ZONE
Z            &n=
bsp;  
|

            &nb=
sp;            =
  
|            &n=
bsp;            =
;            &n=
bsp;   
|

            &nb=
sp;            =
  
|            &n=
bsp;            =
;            &n=
bsp;   
|

    Branch local addresses: |     
B1            &=
nbsp; 
B2           B3 &nbs=
p; |

           
Bk            &=
nbsp;
|     
:            &n=
bsp;  
:            
:    |

    Branch interfaces:     
|______:________________:_____________:____|

            &nb=
sp;            =
         
|            &n=
bsp;  
|             |=


    Branch Global
prefixes:       
|         
(branch-SAM)        |

     
*gBkij=3DgZij.zBk*         &nb=
sp;    
=3D> + gB211, gB221, gB222

    Branch Global
Addresses:           =
;
+  gB211@, gB221@, gB222@

     
*gBkij@=3DgBkij.H*         &nb=
sp;            =
       
||

            &nb=
sp;            =
     
BRANCH ZONES         ||

            &nb=
sp;            =
            &nb=
sp;            =
 
\/

            &nb=
sp;            =
            &nb=
sp;   
BRANCH-SIDE ENDPOINTS



            &nb=
sp;        
ROOT AND BRANCH INTERFACES AND SAMs



            &nb=
sp;            =
       
Figure 1



   Each root interface that supports a root-SAM function has a lo=
cal

   address (Rk), and each "branch interface" has a loca=
l
address (Bk).



   If a "branch SAM" function is supported at a branch
interface Bk,

   this interface gets, in addition to its local address, global<=
br>
   prefixes (gBkij).  Each of these prefixes is made of a gl=
obal
prefix

   of the zone (gZij) followed by an identifier (zBk) of the bran=
ch
in

   its zone.



   For each each of its global prefixes gBkij, a branch interface=
 has

   also a host global address (gBkij@), derived from the prefix b=
y

   appending a standard host suffix (H) to complete the address l=
ength.



   Thus, if a zone D is accessible from the global Internet via a
zone

   hierarchy A, B, C, it has at least gA.aB.bC.cD as a global pre=
fix
gD,

   and gA.aB.bC.cD.H as a global address gD@.  SAM is thus a=
n

   application of the locator-identifier separation principle.&nb=
sp;
(It







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Internet-Draft     Stateless  Address 
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   differs however from [LISP], in that no new protocol is needed=
 fro

   SAM, just new options in existing protocols such as DHCP
[RFC2131],

   DHCPv6 [RFC3315], or ND [RFC4861], to advertise SAM parameters=
 to

   branch interfaces.)



3.2.  Encapsulation of global packets in local packets





   endpoint Y Global
address:           &=
nbsp;    
gY

            &nb=
sp;            =
            &nb=
sp;        
^

            &nb=
sp;            =
            &nb=
sp;        
|

            &nb=
sp;            =
            &nb=
sp;       
...

   (3)  e2e
packet:           &n=
bsp;       
[ gX->gY [data]]

            &nb=
sp;            =
            &nb=
sp;        
^

            &nb=
sp;            =
            &nb=
sp;        
|

            &nb=
sp;            =
            &nb=
sp;       
gZ         ROOT ZONE R

            &nb=
sp;            =
       
______________:______________________

            &nb=
sp;            =
      
|(Z)       (root SAM)    =
            
|

            &nb=
sp;            =
      
|            &n=
bsp;
R         LOCAL ZONE Z |

            &nb=
sp;            =
      
|            &n=
bsp;
^            &n=
bsp;        
|

            &nb=
sp;            =
      
|            &n=
bsp;
|            &n=
bsp;        
|

            &nb=
sp;            =
      
|            
...            =
        
|

   (2)  encapsulated packet:   
|            &n=
bsp;            =
;           
|

         *B =3D
la(gX)*          
|      [  B->R
[gX->gY[data]]         |

         *R =3D
parameter*       
|            &n=
bsp;
^            &n=
bsp;        
|

            &nb=
sp;            =
      
|            &n=
bsp;
|            &n=
bsp;        
|

            &nb=
sp;            =
      
|            &n=
bsp;
B            &n=
bsp;        
|

            &nb=
sp;            =
      
|______________:______________________|

            &nb=
sp;            =
            &nb=
sp;   
(branch SAM)   BRANCH ZONE B

            &nb=
sp;            =
            &nb=
sp;    
=3D> + gB

            &nb=
sp;            =
            &nb=
sp;        
^

            &nb=
sp;            =
            &nb=
sp;        
|

            &nb=
sp;            =
            &nb=
sp;       
...

   (1)  e2e packet:       =
;            
[ gX->gY [data]]

            &nb=
sp;            =
            &nb=
sp;        
^

            &nb=
sp;            =
            &nb=
sp;        
|

   endpoint X Global
address:          gX=3DgZ.id(B=
).xxx





     PACKET ENCAPSULATION AND ADDRESS MAPPING - BRANCH =
SIDE
TO ROOT SIDE



            &nb=
sp;            =
       
Figure 2



   To traverse a SAM local zone, global-address packets are
encapsulated

   into local address packets, as illustrated in Figure 2 and Fig=
ure
3).



   Thus, compatibility is ensured, within the local zone, with in=
gress

   the filtering for multihomed networks of [RFC3704], the basic
anti-







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   spoofing mechanism.





            &nb=
sp;            =
            &nb=
sp;        
|

            &nb=
sp;            =
            &nb=
sp;        
|           ROOT ZONE

            &nb=
sp;            =
            &nb=
sp;       
gZ

            &nb=
sp;            =
       
______________:______________________

            &nb=
sp;            =
      
|(Z)      
(root-SAM)           =
;     
|

            &nb=
sp;            =
      
|            &n=
bsp;
R         LOCAL ZONE Z |

            &nb=
sp;            =
      
|            &n=
bsp;            =
;           
|

            &nb=
sp;            =
      
|            &n=
bsp;            =
;           
|

            &nb=
sp;            =
      
|            &n=
bsp;            =
;           
|

   (2)  encapsulated packet:   
|     [ B1->B2
[gE1->gE2[data]]       |

        *B1 =3D
la(gX)*          
|        
-------->--------         &=
nbsp;
|

        *B2 =3D
la(gY)*          
|      
/            &n=
bsp;     
\         |

            &nb=
sp;            =
      
|      ^       =
            &nb=
sp;
|        |

            &nb=
sp;            =
      
|      |       =
            &nb=
sp;
v        |

            &nb=
sp;            =
      
|      B1       =
;            
B2       |

            &nb=
sp;            =
      
|______:_____________________:________|

           BRANCH
ZONES:         
(branch-SAM)          (branch-=
SAM)

            &nb=
sp;            =
          
=3D> + gB1          &n=
bsp;  
=3D> + gB2

            &nb=
sp;            =
            &nb=
sp;
^            &n=
bsp;       
|

            &nb=
sp;            =
            &nb=
sp;
|            &n=
bsp;       
v

   (3)  e2e
packet:           &n=
bsp;      
...            =
 
[ E1->E2 [data]]

   (1)  e2e
packet:           &n=
bsp;
[ E1->E2
[data]]           &n=
bsp;
...

            &nb=
sp;            =
            &nb=
sp;
^            &n=
bsp;       
|

            &nb=
sp;            =
            &nb=
sp;
|            &n=
bsp;       
v

            &nb=
sp;            =
     
gX=3DgZ.id(B1).xxx         gY=3DgZ.=
id(B2).yyy

            &nb=
sp;            =
            
_:_            =
      
_:_

            &nb=
sp;            =
           
| X
|            &n=
bsp;   
| Y |

            &nb=
sp;            =
           
|___|           &nbs=
p;    
|___|



   ADDRESS MAPPING AND PACKET ENCAPSULATION - BRANCH SIDE TO BRAN=
CH
SIDE



            &nb=
sp;            =
       
Figure 3



   For the IP-in-IP encapsulation, the IPv6 next header or the IP=
v4

   protocol id which indicates the type of IP payload is set to 4=
1
(the

   same value as for 6to4, ISATAP, and 6rd).



   Local addresses are determined as follows (illustrated in figu=
res

   Figure 2 and Figure 3):



   1.  If an endpoint global address gE, indifferently sourc=
e or

       destination, is that of a branch-side
endpoint, this is

       recognized by the fact that it starts =
with
one of the global

       prefixes of the zone.  Then, the
local address B is obtained by a

       function B=3Dla(gX), completely determ=
ined
by SAM parameters of the







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       zone (details in Section 3.4).



   2.  If an endpoint global address gE, indifferently sourc=
e or

       destination, is that of a root-side
endpoint, this is recognized

       by the fact that it doesn't start with=
 any
of the global prefixes

       of the zone.  In this case, the o=
ther
address gX of the packet,

       destination or source respectively, is
necessarily that of a

       branch-side endpoint (otherwise the pa=
cket
would not traverse the

       local zone).  Then, local address=
 Ri
is that of the root

       interface that has, in its assigned gl=
obal
prefixes, the global

       prefix present at the beginning of the
branch-side address gX.



   In multihomed sites, the second of these rules ensures
compatibility

   with the ingress filtering of [RFC3704] in root zones (if it d=
oes

   apply, as necessary for anti-spoofing protection).



   In Figure 2 and Figure 3, packets in the reverse direction, no=
t

   shown, would have the same addresses but with sources and

   destinations inverted, and with encapsulations and decapsulati=
ons

   made at inverted interfaces.



   Decapsulation functions MUST verify, for anti-spoofing protect=
ion,

   that local addresses present in headers of encapsulating packe=
ts
are

   consistent with global addresses present in headers of
encapsulated

   packets.



3.3.  Global prefixes - global addresses - local addresses



   Internal structures of SAM global prefixes, global addresses, =
and

   local addresses are detailed in Figure 4.



   A branch-interface global prefix necessarily starts with a glo=
bal

   prefix of the zone Z. Its remaining bits are a "branch
identifier" in

   the zone (gBkij =3D gZij.zB).



































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|<-------------- Branch global address gB@ ------------->|

            
|<-------- Branch global prefix gB
-------->          &nb=
sp; 
|

            
|<-- G --><-----  Branch identifier iB
---->           &=
nbsp;
|

            &nb=
sp;
________________________________________________________

            
|  local  |branch|  Subnet |    
branch     |   branch   |

            
|  zone   |  id  |  index 
|      Index    
|    Host    |

            
|  Global |Format|
(option)|           =
    
|  endpoint  |

            
|  prefix | code |        
|            &n=
bsp;  
|   suffix   |

            
|        
|     
|        
|            &n=
bsp;  
| (10...00)  |

            
|    G    |   F 
|    S   
|        I     =
 
|     H      |

            
|_________|______|_________|________________|____________|

            &nb=
sp;      
_______/   <-- s ---><----- i ------>

            &nb=
sp;    
/            &n=
bsp; 
^            &n=
bsp;      
^

            &nb=
sp;   
v            &n=
bsp;  
|            &n=
bsp;      
|

        Specifies s and
b       
/            &n=
bsp;        
\

         
(option)           &=
nbsp; 
|            &n=
bsp;          
\

        Specify F  
<-----.-----|--------------------.    \

            &nb=
sp;            =
 
\   
|            &n=
bsp;       
\    |

            &nb=
sp;            =
  
\  
v            &n=
bsp;        
\   v

            &nb=
sp;            =
 
<-- s
--->           &n=
bsp;    
<----- i ------>|

            &nb=
sp;
________________________________________________________

            
|local-address| Subnet  |  next field  
|     branch     |

            
|   constant  |  index  |   Delimiter&nb=
sp; 
|      index     |

            
|    Prefix  
|         |  
(00...01)   |        &nbs=
p;      
|

            
|            
|        
|            &n=
bsp; 
|            &n=
bsp;  
|

            
|       P    
|    S    |     
D        |     =
  
I       |

            
|_____________|_________|_______________|________________|

            
|<-- subnet prefix zS -->

            
|<-------------- Branch local address B ---------------->|





         SAM GLOBAL PREFIXES - GLOB=
AL
ADDRESSES - LOCAL ADDRESSES



            &nb=
sp;            =
       
Figure 4



   Principles that influence the internal structure of branch

   identifiers proposed for SAM are the following:



   1.  To permit a flexible hierarchy of local zones, branch
identifiers

       should be kept rather short.  The=
y
should, at least to some

       extent, be proportionate to the maximu=
m
number of branches

       supported in their zone.



   2.  Several subnets must be possible in the zone.  F=
or
this, a branch

       identifier contain an optional
"subnet index" (S), followed the

       "branch index" (I) which
identifies the branch in its subnet.

       (The word "index" is chosen =
to
express that these fields have no

       further internal structure.)







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   3.  For the efficiency of routing tables, intra-zone subn=
et
indexes

       have to be in the upper part of local
addresses, just behind the

       "constant prefix" (P) that i=
s
common to all local addresses.  (In

       IPv6, this constant prefix can typical=
ly
be an ULA prefix of

       [RFC4193]; in IPv4 is typically a
private-address prefix of

       [RFC1918].)



   4.  For efficiency of the neighbor discovery protocol of
[RFC2461],

       branch indexes B have on the contrary =
to
be in the lowest part of

       branch local addresses B.



   5.  Consequently, it must be possible to extract separate=
ly,
from a

       intra-zone branch identifier iB, the
subnet index S and the

       interface index I, and for this to kno=
w
their lengths (s and i).



   6.  In order to permit to configure several subnet-index
lengths,

       and/or several interface index lengths=
, in
SAM zones, an optional

       branch-identifier "format code&qu=
ot;
(F) is placed at the beginning of

       branch identifiers B (just before the
optional subnet index S,

       and the branch index B).  Each fo=
rmat
codes specifies a subnet-

       index length s and an interface-index
length i.  Format codes T

       may have different lengths, but must b=
e
non overlapping prefixes

       to be recognized.



   Since the local address B of a branch interface starts with a<=
br>
   constant prefix P followed by the interface subnet index S , a=
nd
is

   terminated by the interface-index of the interface, space is l=
eft

   between them.  It is filled with a next-field delimiter
(D).  Its

   format, a series of 0s followed by a 1, i.e. 00...01 with a
minimal

   length of 1 bit, is chosen so that knowing the constant prefix=
 P
and

   the subnet prefix of a branch interface, lengths s and i of th=
e
its

   subnet index S and of its interface index I can be
determined.  Then,

   the identifier format F to be placed in global prefixes of B c=
an
be

   derived from these lengths s and i.



3.4.  Endpoint global address to branch local address mapping



   Detailed steps by which a branch local address B is derived fr=
om
from

   the global address of a branch-side endpoint are presented in<=
br>
   Figure 5.























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            &nb=
sp;
________________________________________________________

            
|            &n=
bsp;    
Endpoint Global address        &nbs=
p;     
|

            
|            &n=
bsp;            =
;   
gE            &=
nbsp;           
|

            
|________________________________________________________|

            &nb=
sp;            =
 
(A) ANALYSIS    ||

            &nb=
sp;            =
            &nb=
sp;    
\/

            &nb=
sp;
___________________________________________ ............

             |
Global  |  id  |  Subnet |    
branch     | endpoint   :

             |
prefix  |Format|  index  |     
Index     |  suffix    :

            
|    G    |   F 
|    S   
|        I     =
 
|     E      :

            
|_________|______|_________|________________|............:

            &nb=
sp;         
|   |      
|            |

     1. Match found    |  
|      
|            |

     in the G list  ___|  
|      
|            |

            &nb=
sp;            =
 
|      
|            |

     2. Match
found       
|      
|            |

     in the F list  
______|      
|            |

            &nb=
sp;            =
         
|            |

     3. length defined by F
_______|            =
|

            &nb=
sp;            =
         
.            |

     4. length defined by F ____________________|

            &nb=
sp;            =
         
.            .

            &nb=
sp;   
(B) CONSTRUCTION  .     ||    =
 .

            &nb=
sp;            =
         
.     \/     .

     5. The
current           &n=
bsp;   
.            .

     local-address prefix
__      
.            .

            &nb=
sp;            =
  
|     
.            .

     6. From step 3.
_______:______.__          .
            &nb=
sp;            =
  
|        
|         .

     7. From step 4. _______:_________:_________.______=
____

            &nb=
sp;            =
  
|        
|            &n=
bsp;      
|

     8. Binary 00...01
_____:_________:________        &nb=
sp;  
|

            &nb=
sp;            =
  
|        
|       
|           |

            &nb=
sp;
______________|_________|________|___________|__________

            
|  local-address  | Subnet  |next field
|     branch     |

            
|     Prefix      | 
index  | Delimiter |     
Index     |

            
|        
P       |    S  &nbs=
p;
|    D      |   &nbs=
p;   
I       |

            
|_________________|_________|___________|________________|

            
|<--------------- Branch Local address B --------------->|



        DERIVING A BRANCH LOCAL ADDRESS =
FROM
AN ENDPOINT GLOBAL ADDRESS



            &nb=
sp;            =
       
Figure 5

















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3.5.  Privacy protection



   In a zone where privacy protection is desired, the privacy opt=
ion
can

   be turned on.  Principles of this option are the followin=
g:



   o  Fields that identify branch-side IP endpoints in priva=
cy
protected

      zones, or transport endpoints if endpoints a=
re
at this layer, are

      obfuscated in e2e packets that traverse the =
the
global Internet.



   o  This obfuscation is stateless and reversible.



   o  Branch SAMs of a privacy-protected zone are informed o=
f
parameters

      of this obfuscation.  They can thus kno=
w
which "hidden" addresses

      (or addresses plus ports), appear on the glo=
bal
Internet in place

      of their "clear" addresses (or add=
ress
plus ports).  These clear

      addresses are those from which local address=
es
are derived in the

      privacy-protected zone and in zones that are
lower in the

      hierarchy.



   o  In these lower zones, all branch SAMs are informed tha=
t a
root SAM

      in the global-Internet direction has activat=
ed a
privacy option,

      and are informed of parameters of this
option.  They can thus

      derive a clear address (or address plus port=
)
from an obfuscated

      address (or address plus port), and
conversely.  They can also

      avoid to activate the privacy so that
obfuscation is never done

      more than once.



   Parameters of a privacy option are a privacy global prefix (PP=
m)
and

   a scrambling multiplier (PMm).  The prefix is that which,=
 at
the

   beginning of global addresses, is not obfuscated in the global=


   Internet.  The multiplier is a 64 bit odd constant.



   Obfuscation consists in a modulo 2^n multiplication by the scr=
ambling

   multiplier, where n is the number of bits to be obfuscated.&nb=
sp;
De-

   obfuscation is the modulo 2^n multiplication by the inverse of=
 the

   scrambling multiplier (for odd numbers, such an inverse modulo=
 2^n

   always exists).



   In hosts in which the branch SAM is informed of an active priv=
acy

   option, applications that ask for their address and their port=
 at

   their socket interface, get them in hidden form, that which
appears

   in the global Internet.  The e2e principle is thus preser=
ved
despite

   the fact that the topology of the privacy-protected zone and t=
hat
of

   lower zones in the hierarchy are all hidden, and despite the f=
act

   that successive transport connections from a same host cannot,=
 in
the

   global Internet, be related to a single host.



   Ports that are concerned with the privacy option are only the =
IANA







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   defined dynamic and/or private ports (ports 49152 to 65535, th=
ose

   starting with binary 11).  Well known ports and registere=
d
ports,

   which have an e2e meaning not to be lost must not be obfuscate=
d.



   Since some applications, e.g. active mode FTP of [RFC0959], wo=
rk
on

   port pairs rather than on individual ports, port bits to be
   obfuscated must exclude the las one.  Port bits that are =
part
of

   obfuscated endpoint identifiers are then bits 2 to 14.







            &nb=
sp;            =
            &nb=
sp;     
gY

            &nb=
sp;            =
            &nb=
sp;      
^

            &nb=
sp;            =
            &nb=
sp;      
|

            &nb=
sp;            =
            &nb=
sp;     
...

    e2e
packet:           &n=
bsp; 
gZ11.F2.hhhh->gY [TCP hh->80 [data]]

            &nb=
sp;            =
            &nb=
sp;      
^

            &nb=
sp;            =
            &nb=
sp;      
|

            &nb=
sp;            =
            &nb=
sp;    
gZkij         ROOT ZONE R

            &nb=
sp;    
___________________________:________________________

            &nb=
sp;   
|(Z)            =
;
.--> (root SAM)         &nb=
sp;          
|

    Privacy-option
ON           
/          
Rk            &=
nbsp;         
|

    for prefix PP1 =3D gZkij.F1
---'          
^          LOCAL ZONE Z  =
|

    with multiplier
PM1            =
         
|            &n=
bsp;          
|

            &nb=
sp;   
|            &n=
bsp;            =
; 
|            &n=
bsp;          
|

            &nb=
sp;   
|            &n=
bsp;            =
;
...            =
          
|

    encapsulated |   [ B->R [ gZkij.cccc->gY
[TCP cc->80 [data]]      |

       packet   
|            &n=
bsp;            =
;            &n=
bsp;            =
; 
|

            &nb=
sp;   
|            &n=
bsp;            =
; 
^            &n=
bsp;          
|

            &nb=
sp;   
|            &n=
bsp;            =
; 
|            &n=
bsp;          
|

            &nb=
sp;   
|            &n=
bsp;            =
; 
B            &n=
bsp;          
|

            &nb=
sp;   
|___________________________:________________________|

            &nb=
sp;            =
            &nb=
sp; 
(branch SAM)

    Clear-address
packet:        gZkij.F1.cccc->gY [TCP
cc->80 [data]]

    e2e
packet:           &n=
bsp;     
gZkij.F1.hhhh->gY [TCP hh->80 [data]]

       where tmp =3D modulo 2^m (PM1 x (cccc =
.
(bits 2 to 14 of cc))

            &nb=
sp;     
where m =3D length of cccc + length of cc - 3

             hh=
hh =3D
bits 0 to (length of hhhh - 1) of tmp

             hh=
 =3D
cc in which bits 2-15 are replaced by

            &nb=
sp;    
bits(length of PP1 TO m - 1) of tmp .



            &nb=
sp;            =
 
SAM PRIVACY OPTION ILLUSTRATION



            &nb=
sp;            =
       
Figure 6



   Figure 6 illustrates the effect of the privacy option.  T=
he
option is

   supposed to be on, in the root SAM of the zone, for its global
prefix

   gZkij and its identifier format F1.  The privacy-option
prefix is







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   therefore PP1 =3D gZ11.F2. the scrambling multiplie ris PM1.


3.6.  SAM parameters



   Table 3 to Table 5 of this section present the complete set of=
 SAM

   parameters described in previous sections.



            &nb=
sp;        
+-----------------------+-----+

            &nb=
sp;        
| constant local Prefix | TTL |

            &nb=
sp;        
+-----------------------+-----+

            &nb=
sp;        
|         
...          | ... |

            &nb=
sp;        
|          
Pm          | PTm |

            &nb=
sp;        
|         
...          | ... |

            &nb=
sp;        
+-----------------------+-----+



            &nb=
sp;          
CONSTANT PREFIX PARAMETERS



            &nb=
sp;            =
        
Table 1



  
+--------------------+-----+------------------+---------------------+

   |  identifier Format | TTL |  
Subnet-index   |   Interface-index   |

   |       
code        |    
|      Length     
|        Length    &=
nbsp; 
|

  
+--------------------+-----+------------------+---------------------+

   |        
...        | ...
|       
...      
|         ...   &nbs=
p;    
|

   |        
Fn         | FTn |   =
;    
SLn      
|        
ILn         |

   |        
...        | ...
|       
...      
|         ...   &nbs=
p;    
|

  
+--------------------+-----+------------------+---------------------+



            &nb=
sp;         
IDENTIFIER-FORMAT PARAMETERS



            &nb=
sp;            =
        
Table 2



  
+-----------------+-----+---------------+-----+---------------+-----+

   |    Root local   | TTL | Global Pref=
ix |
... | Global Prefix | ... |

   |     address    
|     |      
1       |    
|       j      
|     |

   +-----------------+-----+---------------+-----+---------------=
+-----+

   |      
...       | ... |    &nbs=
p;
...      | ... |     
...      | ... |

   |       
Ri       | RTi |     =
;
gZi1     | ... |     
gZij     | ... |

   |      
...       | ... |    &nbs=
p;
...      | ... |     
...      | ... |

  
+-----------------+-----+---------------+-----+---------------+-----+



            &nb=
sp;            =
    
ROOT PARAMETERS



            &nb=
sp;            =
        
Table 3















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            &nb=
sp;         
+--------------------+------+

            &nb=
sp;         
| Global zone prefix |  TTL |

            &nb=
sp;         
+--------------------+------+

            &nb=
sp;         
|        
...        |  ... |

            &nb=
sp;         
|       
gZij        | GTij |

            &nb=
sp;         
|        
...        |  ... |

            &nb=
sp;         
+--------------------+------+



            &nb=
sp;           
GLOBAL-PREFIX PARAMETERS



            &nb=
sp;            =
        
Table 4



       
+-----------------------+-----+---------------------------+

        | Privacy-option Prefix | TTL |
Privacy-option Multiplier |

       
+-----------------------+-----+---------------------------+

       
|         
...          | ...
|           
...            |

       
|         
PPp          | PTp
|           
PMp            |

       
|         
...          | ...
|           
...            |

       
+-----------------------+-----+---------------------------+



            &nb=
sp;           
PRIVACY-OPTION PARAMETERS



            &nb=
sp;            =
        
Table 5



3.7.  Port-range-based extended IPv4 addressing



   For a dual stack host not to break the e2e principle when it
   establishes a connection with an remote endpoint that is still
only

   reachable in IPv4, it must have a global IPv4 address. 
Because of

   the IPv4 address shortage, this address may however be shared =
with

   other hosts.  For this, SAM accepts "port-extended&q=
uot;
IPv4 prefixes,

   longer than 32 bits.  Bits beyond the first 32 define a p=
ort
range in

   the set of dynamic and/or private ports (those in which the tw=
o
high

   order bits are binary 11).  For example, a 3-bit prefix
extension 010

   imposes that branch-side hosts use only ports starting with bi=
nary

   11010.



   Note that, due to the systematic encapsulation of global packe=
ts
in

   local packets of SAM, routing within SAM zones is not concerne=
d
with

   theses "port-extended" IPv4 addresses.  Only ro=
ot
SAMs and branch

   SAMs have to know about of port ranges.



   The branch SAM in a host that is assigned a port-restricted IP=
v4

   address has to inform its socket interface of the port range
   available to applications, and to inform its internal NAT if i=
t
has

   one.  Consequences for applications, and for NATs, of
restricted port

   ranges, are out of the scope of this SAM specification. 
Other

   documents are available on the subject, e.g.  [Boucadair]=
,
which







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   however requires further study.





4.  SAM Application examples



4.1.  Address independence in an IPv6 site



   In the example of Figure 7, we consider a home or SOHO site in
which

   an Ethernet and/or WiFi LAN is deployed.  Its global IPv6
prefix gZ

   is 2001:0db8:9999::/48.



   Local addressing is done in an IPv6 private space.  To ke=
ep
address

   shorts in the figure, the constant prefix of these addresses i=
s

   fc00/8, the shortest prefix reserved for private IPv6 addressi=
ng
in

   [RFC4193].  (This prefix could however be replaced by a f=
ull
fdxx:

   xxxx:xxxx::/48 prefix, as recommended in [RFC4193] for ULAs,
without

   changing the substance of the example.)



   The site is configured to support 255 branch interfaces on the=
 LAN

   (each branch being indifferently a host and/or a router). =
; To

   facilitate future changes, a branch-identifier format code F1,=
 set
to

   0/4, is used in branch global prefixes.



   SAM parameters of the site are then following (ignoring TTLs):=




      Constant local prefix: P1 =3D fc00/8



      Identifier format code: F1 =3D 0::/4



      Subnet index length: SL1 =3D 0 (non applicab=
le)



      Interface index length: IL1 =3D 8



      Root local address: R1 =3D fc00::0101



      Zone Global prefix: gZ11 =3D 2001:0db8:9999:=
:/48



      Privacy option prefix: none in this example<=
br>


   We now consider a SAM-capable PC which serves as a router for =
a

   bluetooth link.  On this link, a bluetooth mobile phone i=
s
active.

   (Configuring a root-SAM in the PC would permit the mobile phon=
e,
if

   acting as a SAM-capable router, to assign global prefixes and<=
br>
   addresses, to hosts behind it.  But this would have been =
too
much for

   the example).













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            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;            =
        
2001:0db8:9999::/48

            &nb=
sp;           
_________________:_________________

            &nb=
sp;          
|(Z)       (root SAM) for 2^8 hosts |

            &nb=
sp;  
Site   
|           
fc00::0101           =
; 
|

            &nb=
sp; 
gateway 
|            &n=
bsp;            =
;         
|

            &nb=
sp;          
|            &n=
bsp;            =
;         
|

            &nb=
sp;          
|           
fc00::0155           =
; 
|

            &nb=
sp;          
|_________________:_________________|

            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;   
Ethernet and/or WiFi    ...

            &nb=
sp;        
fcOO::/64           |



            &nb=
sp;            =
            
fc00::0155

            &nb=
sp;            =
           
(branch SAM)

            &nb=
sp;            =
   
=3D> +  2001:0db8:9999:0550::/60

            &nb=
sp;            =
      
__________:__________

            &nb=
sp;            =
     
|2001:0db8:9999:0558::|

            &nb=
sp; 
PC            &=
nbsp;
|            &n=
bsp;       
|

            &nb=
sp;            =
     
|_____________________|

            &nb=
sp;            =
    
/___________._________/

            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;    
Bluetooth           =
  
...

            &nb=
sp; 
2001:0db8:9999:0550::/64   |

            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;            =
  
2001:0db8:9999:0550:< eui64 IID >

            &nb=
sp;            =
            &nb=
sp;   
|

            &nb=
sp;            =
            &nb=
sp; 
|_|__

            &nb=
sp;            =
            &nb=
sp;
|     |

            &nb=
sp; 
Mobile phone          &nb=
sp;
|     |

            &nb=
sp;            =
            &nb=
sp;
|     |

            &nb=
sp;            =
            &nb=
sp;
|_____|



            &nb=
sp;            =
       
Figure 7



   The PC local address B is fc00::0155, i.e.  P.D.I where P=
 is

   fc00::/8, where the 8 bits of I are supposed to be 55::/8, and
where

   D is binary 00...01 with consequently (128 - 8 -8) =3D 112 bit=
s.



   The PC global prefix gB is therefore 2001:0db8:9999:0550::/60,
i.e.

   G.F.I, where G is 2001:0db8:9999::/48, where F is 0::/4, and w=
here
I

   is 55::/8.



   The PC global address is therefore 2001:0db8:9999:0558::, i.e.
gB.E

   where E is binary 10...00 with (128 - 48 - 4 - 8) =3D 68 bits.=




   The bluetooth link is supposed to have 0::/4 as subnet ID in t=
he
PC.







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   Its /64 subnet prefix is therefore 2001:0db8:9999:0550::/64.


   This simple example illustrates how the SAM logic permits to
   establish a hierarchy of routing zones where each host can bec=
ome
a

   router, and where the e2e principle is preserved.



4.2.  Multihoming and extended IPv4 addressing in a home site



   In the example of Figure 8, we consider a home site S, multiho=
med

   with two ISPs A and B.



   ISP A assigns to the site IPv6 prefix 2001:1111:1111:1110::/60=
,
and

   IPv4 address 192.0.2.1.



   ISP B can only assign port-restricted IPv4 addresses to its si=
tes

   because it has to support up to 2^16 sites, and has only for t=
his
an

   IPv4 /18 prefix (namely 198.16.0.0/18, i.e. v4|c610:0000:/18),=
 and

   since 18 + 16 =3D 34 which exceeds 32.  Having 2001:0db8:=
:/32
as its

   IPv6 prefix, it assigns /48s to its customer sites, in particu=
lar

   2001:0db8:0202::/48 to site S.



   Half of its IPv4 address space, namely v4|c608:c000/19 is
allocated

   to a NAT to support sites that are not SAM capable.  The =
other
half,

   i.e. v4|c610:2000/19, is allocated to a root SAM, the local
address

   of which is supposed to be 2001:0db8::1.



   SAM parameters of the zone of ISP B are then the following:


      Constant local prefix: P1 =3D 2001:0db8: =3D
v4|a000::/8



      Identifier format code: F1 =3D ::/0 (non
applicable)



      Subnet index length: SL1 =3D 0 (non applicab=
le)



      Interface index length: IL1 =3D 16



      Root local address: R1 =3D 2001:0db8::1:1


      Zone Global prefix: gZ11 =3D v4|c608:8000/19
(=3D198.8.128.0/19).



      Privacy option prefix: none in this example
(::/0)





















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            &nb=
sp;            =
            &nb=
sp;            =
   
198.16.0.0/18

            &nb=
sp;            =
      
2001:0db8::/32       =3Dv4|c610:0000:/18

            &nb=
sp;            =
        
____|__________________|____________

            &nb=
sp;            =
       
|(B)            =
;
/           
\      |

            &nb=
sp;            =
       
|            &n=
bsp; 
|    v4|c610:2000/19 |

            &nb=
sp;            =
       
|          v4|c608:c000/19&nbs=
p;    
|    |

            &nb=
sp;            =
       
|            
(NAT)       (root SAM) |

            &nb=
sp;            =
       
|         0.0.0.0/0  &nbs=
p; 
2001:0db8::1 |

    
|(A)            =
;        
| 
|            &n=
bsp;            =
;          
|

    
|            &n=
bsp;          
| 
|            &n=
bsp;            =
;          
|

     |2001:1111:1111:1110::/60|  |   (2^=
16
SAM
sites)           &nb=
sp;    
|

     |       192.0.2.1&nb=
sp;      
| 
|            &n=
bsp;            =
;          
|

     |      =3Dv4|c000:0201/32=
 
|  |     
2001:0db8:0202::/48         &n=
bsp;
|

     |________________:_______| 
|___________________:________________|

            &nb=
sp;        
|            &n=
bsp;        
(branch SAM)

            &nb=
sp;        
|           =3D> +
v4|c610:2040:4000::/35

            &nb=
sp;        
|            &n=
bsp;
=3D 198.8.128.64/ports 11010...

     
________________:______________________________:________________

     |(S)    
/            &n=
bsp; 
\            &n=
bsp; 
/            &n=
bsp;
\        |

     |      
|     v4|c000:0201:0000::/33    | 
v4|c610:2040:4000::/36|

     |      
|            &n=
bsp;   
::/0         
|            &n=
bsp;   
::/0   |

     | v4|c600:0201:8000::/33  
|     v4|c608:2040:6000::/36   
|     |

     |    
(NAT)            (ro=
ot
SAM)    
(NAT)          (root SAM) =
; |

     |  
0.0.0.0/0         
fc00::0011    0.0.0.0/0      
fc00::0012  |

    
|            &n=
bsp;            =
;            &n=
bsp;            =
;            &n=
bsp;
|

     | (2^4 SAM
hosts)           &nb=
sp;            =
            &nb=
sp;          
|

    
|            &n=
bsp;          
fc00::0018           =
;            &n=
bsp;     
|

    
|_____________________________:__________________________________|

            &nb=
sp;            =
         
|

           HOST
(H)           (branch SAM=
)

            &nb=
sp;      
=3D> + 2001:1111:1111:1118:8000::0008/64

            &nb=
sp;         
+ 2001:0db8:0220:4800::0008/52

           +
v4|c000:0201:4000::/37 =3D 192.0.2.1 ports 1101000...

           +
v4|c610:2040:5000::/40 =3D 198.16.32.64 ports 1101001000...

            &nb=
sp;            =
        
:

            &nb=
sp;            =
        
HOST



       PRIVATE-ADDRESSING- AND DUAL-HOMING- S=
ITE
WITH E2E CAPABILITY



            &nb=
sp;            =
       
Figure 8



   In site S, the branch SAM of its root interface with ISP B der=
ives

   from its IPv6 prefix 2001:0db8:O2O2::/48, and from SAM paramet=
ers
of

   ISP B, its IPv4 prefix v4|c610:2040:4000::/35, which is a port=
-

   restricted one.



   Two root SAMs are configured in site S. Its local-address cons=
tant

   prefix is fc00::/8 as.  Half of the each available IPv4
addressing







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   space is reserved for a NAT, and the other half for a root SAM=
.



   Parameters of SAMs of site S are then the following:



      Constant local prefix: P1 =3D fc00/8



      Identifier format code: F1 =3D 0::/4



      Subnet index length: SL1 =3D 0



      Interface index length: IL1 =3D 8



      Root local addresses: R1 =3D fc00::0011; R2 =
=3D
fc00::0012



      Zone Global prefixes: gZ11 =3D
2001:1111:1111:1110::/60; gZ12 =3D v4|

      c000:0201/32; gz21 =3D 2001:0db8:0202::/48; =
gZ22 =3D
v4|

      c610:2040:4000::/35



      Privacy option prefix: none in this example
(::/0)



   Among the 16 hosts of home site S, Host H is supposed to have
local

   address fc00::0018.  As shown on the figure, the branch S=
AM
of host H

   then derives from this local address two IPv6 global prefixes,=
 two

   IPv6 global host addresses starting with these prefixes, and t=
wo

   port-restricted IPv4 prefixes.  With these prefixes, it c=
an
use,

   without breaking the e2e principle, 512 ports for connections =
via
ISP

   A, and 64 ports via ISP B.





5.  SAM as an alternative to NATs in IPv6



   With SAM as specified, all NAT44 services that have been liste=
d in

   Section 2 can be offered in IPv6 without stateful processing a=
nd

   without breaking the e2e principle:



   1.  In a private-addressing IPv6 site, hosts can know the=
ir
global

       addresses to use them in e2e packets t=
hat
are encapsulated in

       local packets to traverse the site.&nb=
sp;
Renumbering is then

       automated simply by automating
advertisement of SAM parameter

       changes (in DHCP and/or with router
advertisements).



   2.  The fact that NAT44s are in general configured with b=
y
default

       rejection of all incoming calls can ha=
ve a
simple stateless

       equivalent in IPv6:



       *  By default, reject all incomin=
g
packets that have a branch-

          side port in the wel=
l
known or in the IANA defined registered

          port ranges.







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       *  By default, reject all TCP
incoming packets that are attempts

          to open new incoming
connections (SYN packets without ACK).



   3.  In a SAM-capable site, SAM-capable hosts can take
advantage of

       site multihoming with full compatibili=
ty
with ingress filtering

       of [RFC3704] in both the site itself a=
nd
in ISP networks to which

       it is connected.



   4.  The privacy protection described in Section 3.5 maint=
ains
the e2e

       principle.  It is expected to be
largely sufficient in practice.

       (Sophisticated hackers would probably =
find
ways around it, and

       identify who does what in sites havin =
the
privacy-protection

       option, but NAT44s are not perfect for
privacy protection

       either).



   5.  As we have seen, SAM global addresses contain a flexi=
ble

       succession of branch identifiers, so t=
hat
it becomes possible to

       set up a flexible hierarchy of private
addressing zones.  In

       particular, host-rooted subnets become
possible without breaking

       the e2e principle.



   For information, no intellectual property right has been appli=
ed
for

   by the author on any of SAM mechanisms.  The intent is to
facilitate

   IPv6 deployment with new mechanisms that still enhance its
potential.





6.  Security considerations



   Like any function where some parameters have to be configured,=
 SAM

   introduces a risk of human errors.



   Besides that, no security risk introduced by SAM has so far be=
en

   identified.  In particular:



   Provided consistency between local addresses present in
encapsulating

   packets and global addresses present in encapsulated packets a=
re

   systematic, no more address spoofing is possible than without =
SAM.



   Due to the stateless operation of SAM, its scalability is high=
.

   Prevention against denial of service attacks should therefore
remain

   easy even for very intense traffic (e.g. using load balancers =
in

   front of parallel devices).





7.  IANA Considerations



   If and when this specification is stabilized and approved, opt=
ion

   codes in DHCP, DHCPv6, and ND will have to be defined to







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   automatically convey SAM parameters to branch SAMs.





8.  Acknowledgements



   As this specification has evolved during many months, precious=


   encouragement and remarks were received from Mark Townsley.&nb=
sp;
He has

   to be warmly thanked for it.  Concerning what SAM can bri=
ng
to port-

   restricted IPv4 addresses, stimulating discussions with Dan Wi=
ng,

   Teemu Savolainen, Gabor Bajko, Pierre Levis, Jean-Luc Grimault=
,
and

   Alain Villefranque, have influenced progress of the work. =
;
Gratitude

   is due to them for this.  Challenging remarks, and a few
(deserved)

   criticisms from Alain Durand have also helped to better analyz=
e
how

   SAM will coexist with NATs.  He deserves credit for it.




9.  References



9.1.  Normative References



   [RFC1918]  Rekhter, Y., Moskowitz, R., Karrenberg, D., Gr=
oot,
G., and

            &nb=
sp;
E. Lear, "Address Allocation for Private Internets",

            &nb=
sp;
BCP 5, RFC 1918, February 1996.



   [RFC2131]  Droms, R., "Dynamic Host Configuration
Protocol",

            &nb=
sp;
RFC 2131, March 1997.



   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T.,
Perkins, C.,

            &nb=
sp;
and M. Carney, "Dynamic Host Configuration Protocol for

            &nb=
sp;
IPv6 (DHCPv6)", RFC 3315, July 2003.



   [RFC4193]  Hinden, R. and B. Haberman, "Unique Local
IPv6 Unicast

            &nb=
sp;
Addresses", RFC 4193, October 2005.



   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H.
Soliman,

            &nb=
sp;
"Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,

            &nb=
sp;
September 2007.



9.2.  Informative References



   [6rd]      Despres, R., "IPv6 Ra=
pid
Deployment on IPv4

            &nb=
sp;
infrastructures (6rd) - Work in progress

            &nb=
sp;
(draft-despres-6rd-02)", October 2008.



   [Boucadair]

            &nb=
sp;
Boucadair, M., Grimault, J-L., Levis, P., and A.

            &nb=
sp;
Villefranque, "Behaviour of BitTorrent service in an IP

            &nb=
sp;
Shared Address Environment







Despres           &n=
bsp;       
Expires May 5,
2009            =
;    
[Page 23]





Internet-Draft     Stateless  Address 
Mapping  (SAM)      November 2008





            &nb=
sp;
(draft-boucadair-behave-bittorrent-portrange-02 - work in

            &nb=
sp;
progress)", january 2009.



   [LISP]     Farinaci, D., Fuller, V., Oran,=
 D.,
Meyer, D., and S.

            &nb=
sp;
Brim, "Locator/ID Separation Protocol (LISP) -

            &nb=
sp;
draft-farinacci-lisp-09", December 2008.



   [RFC0959]  Postel, J. and J. Reynolds, "File Transfe=
r
Protocol",

            &nb=
sp;
STD 9, RFC 959, October 1985.



   [RFC2461]  Narten, T., Nordmark, E., and W. Simpson,
"Neighbor

            &nb=
sp;
Discovery for IP Version 6 (IPv6)", RFC 2461,

            &nb=
sp;
December 1998.



   [RFC2663]  Srisuresh, P. and M. Holdrege, "IP Networ=
k Address

            &nb=
sp;
Translator (NAT) Terminology and Considerations",

            &nb=
sp;
RFC 2663, August 1999.



   [RFC3056]  Carpenter, B. and K. Moore, "Connection o=
f
IPv6 Domains

            &nb=
sp;
via IPv4 Clouds", RFC 3056, February 2001.



   [RFC3286]  Ong, L. and J. Yoakum, "An Introduction t=
o
the Stream

            &nb=
sp;
Control Transmission Protocol (SCTP)", RFC 3286, May 2002.



   [RFC3582]  Abley, J., Black, B., and V. Gill, "Goals=
 for
IPv6 Site-

            &nb=
sp;
Multihoming Architectures", RFC 3582, August 2003.



   [RFC3704]  Baker, F. and P. Savola, "Ingress Filteri=
ng
for Multihomed

            &nb=
sp;
Networks", BCP 84, RFC 3704, March 2004.



   [RFC4219]  Lear, E., "Things Multihoming in IPv6
(MULTI6) Developers

            &nb=
sp;
Should Think About", RFC 4219, October 2005.



   [RFC4301]  Kent, S. and K. Seo, "Security Architectu=
re
for the

            &nb=
sp;
Internet Protocol", RFC 4301, December 2005.



   [RFC4864]  Van de Velde, G., Hain, T., Droms, R., Carpent=
er,
B., and

            &nb=
sp;
E. Klein, "Local Network Protection for IPv6", RFC 4864,

            &nb=
sp;
May 2007.



   [RFC4960]  Stewart, R., "Stream Control Transmission
Protocol",

            &nb=
sp;
RFC 4960, September 2007.



   [RFC5214]  Templin, F., Gleeson, T., and D. Thaler,
"Intra-Site

            &nb=
sp;
Automatic Tunnel Addressing Protocol (ISATAP)", RFC 5214,

            &nb=
sp;
March 2008.



   [Shim6]    Nordmark, E. and M. Bagnulo,
"Shim6: Level 3 Multihoming







Despres           &n=
bsp;       
Expires May 5,
2009            =
;    
[Page 24]





Internet-Draft     Stateless  Address  Mappin=
g 
(SAM)      November 2008





            &nb=
sp;
Shim Protocol for IPv6 - Work in progress

            &nb=
sp;
(draft-ietf-shim6-failure-detection-09)", October 2007.



   [draft-carpenter-renum-needs-work-01]

            &nb=
sp;
Carpenter, B., Atkinson, R., and H. Flinck, "Renumbering

            &nb=
sp;
still needs work - Work in progress", December 2008.



   [shim6 fail detec]

            &nb=
sp;
Arkko, J. and I. van Beijnum, "Failure Detection and

            &nb=
sp;
Locator Pair Exploration Protocol for IPv6 Multihoming -

            &nb=
sp;
Work in progress (draft-ietf-shim6-failure-detection-09)",

            &nb=
sp;
July 2007.





Author's Address



   Remi Despres

   3 rue du President Wilson

   Levallois,

   France



   Email: remi.despres@fr=
ee.fr



























































Despres           &n=
bsp;       
Expires May 5,
2009            =
;    
[Page 25]





Internet-Draft     Stateless  Address 
Mapping  (SAM)      November 2008





Full Copyright Statement



   Copyright (C) The IETF Trust (2008).



   This document is subject to the rights, licenses and restricti=
ons

   contained in BCP 78, and except as set forth therein, the auth=
ors

   retain all their rights.



   This document and the information contained herein are provide=
d on
an

   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION
HE/SHE REPRESENTS

   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TR=
UST
AND

   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES,
EXPRESS

   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE=
 USE
OF

   THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMP=
LIED

   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURP=
OSE.





Intellectual Property



   The IETF takes no position regarding the validity or scope of =
any

   Intellectual Property Rights or other rights that might be cla=
imed
to

   pertain to the implementation or use of the technology describ=
ed
in

   this document or the extent to which any license under such ri=
ghts

   might or might not be available; nor does it represent that it=
 has

   made any independent effort to identify any such rights. 
Information

   on the procedures with respect to rights in RFC documents can =
be

   found in BCP 78 and BCP 79.



   Copies of IPR disclosures made to the IETF Secretariat and any=


   assurances of licenses to be made available, or the result of =
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   attempt made to obtain a general license or permission for the=
 use
of

   such proprietary rights by implementers or users of this

   specification can be obtained from the IETF on-line IPR reposi=
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   http://www.ietf.org/ipr.



   The IETF invites any interested party to bring to its attentio=
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any

   copyrights, patents or patent applications, or other proprieta=
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   rights that may cover technology that may be required to imple=
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   this standard.  Please address the information to the IET=
F at

   ietf-ipr@ietf.org.






















Despres           &n=
bsp;       
Expires May 5,
2009            =
;    
[Page 26]










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From philip_matthews@magma.ca  Sun Apr 12 13:26:29 2009
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Subject: [BEHAVE] TURN: Avoiding IP Fragmentation
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As part of the IESG evaluation of TURN, Lars wrote:
> Discuss:
> Because TURN doesn't translate the ICMP messages necessary for PMTU  
> discovery,
> persistent fragmentation can occur. When we discussed this in the  
> WG, I thought
> we had come to an agreement that the document should say that TURN is
> NOT RECOMMENDED for applications that exchange UDP packets larger than
> the minimum PMTU (500-odd bytes), unless they implement RFC4821.

Hi Lars:

I don't actually remember this agreement, but I think it is a good  
point. I have tried to address it by rewriting the last part of the  
Overview section to include (amongst other changes) the following  
subsection:

2.7.  Avoiding IP Fragmentation

    For reasons described in [Frag-Harmful], applications, especially
    those sending large volumes of data, should try hard to avoid having
    their packets fragmented.  Applications using TCP can more-or-less
    ignore this issue because fragmentation avoidance is now a standard
    part of TCP, but applications using UDP (and thus any application
    using this version of TURN) must handle fragmentation avoidance
    themselves.

    The application running on the client and the peer can take one of
    two approaches to avoid IP fragmentation.

    The first approach is to avoid sending large amounts of application
    data in the TURN messages/UDP datagrams exchanged between the client
    and the peer.  This is the approach taken by most VoIP
    (Voice-over-IP) applications.  In this approach, the application
    exploits the fact that the IP specification [RFC0791] specifies that
    IP packets up to 576 bytes should never need to be fragmented.

    The exact amount of application data that can be included while
    avoiding fragmentation depends the details of the TURN session
    between the client and the server: whether UDP, TCP, or TLS  
transport
    is used, whether ChannelData messages or Send/Data indications are
    used, and whether any additional attributes (such as the DONT-
    FRAGMENT attribute) are included.  Another factor, which is hard to
    determine, is whether the MTU is somewhere along the path is reduced
    for other reasons, such as the use of IP-in-IP tunneling.

    As a guideline, sending a maximum of 500 bytes of application data  
in
    a single TURN message (by the client on the client-to-server leg) or
    a UDP datagram (by the peer on the peer-to-server leg) will  
generally
    avoid IP fragmentation.  To further reduce the chance of
    fragmentation, it is recommended that the client use ChannelData
    messages when transferring significant volumes of data, since the
    overhead of the ChannelData message is less than Send and Data
    indications.

    The second approach the client and peer can take to avoid
    fragmentation is to use a path MTU discovery algorithm to determine
    the maximum amount of application data than can be sent without
    fragmentation.

    Unfortunately, because servers implementing this version of TURN do
    not relay ICMP messages, the classic Path MTU Discovery algorithm
    defined in [RFC1191] is not able to discover the MTU of the
    transmission path between the client and the peer.  (Even if they  
did
    relay ICMP messages, the algorithm would not always work since ICMP
    messages are often filtered out by combined NAT/firewall devices).

    So the client and server need to use a path MTU discovery algorithm
    that does not require ICMP messages.  The Packetized Path MTU
    Discovery algorithm defined in [RFC4821] is one such algorithm.

    The details of how to use the algorithm of [RFC4821] with TURN are
    still under investigation.  However, as a step towards this goal,
    this version of TURN supports a DONT-FRAGMENT attribute.  When the
    client includes this attribute in a Send indication, this tells the
    server to set the DF bit in the resulting UDP datagram that it sends
    to the peer.  Since some servers may be unable to set the DF bit,  
the
    client should also include this attribute in the Allocate request --
    any server that does not support the DONT-FRAGMENT attribute will
    indicate this by rejecting the Allocate request.

How does this sound? Do you think it provides enough guidance to  
application designers?

The recommendation to send no more that 500 bytes came after I did a  
bit of math to see what the Path MTU might be in various situations.  
Depending on the situation, I got an application MTU ranging from 512  
(using Send/Data indications over UDP) to 544 (using ChannelData  
messages over UDP). To be conservative, I rounded these down to 500.

The comment that we are still investigating the use of RFC4821 came  
from spending a bit of time thinking about how it might be used. I  
came up with a number of issues. One issue is that we have tried to  
allow TURN to be implemented in user space, and it seems (from e-mails  
to the mailing list about a year ago) that some operating systems  
don't support setting the DF bit by unprivileged applications. Another  
is that there are situations with ICE where two TURN relays end up  
talking with each other; in these situations, we don't currently have  
a way to determine the MTU of the last leg of the path. I have some  
ideas on how one might work around these issues, but I personally  
think these issues should be investigated as part of a separate  
document.

- Philip


From philip_matthews@magma.ca  Sun Apr 12 13:26:47 2009
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Subject: [BEHAVE] TURN-14 published
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I have just submitted version -14 of TURN (draft-ietf-behave-turn).  
This version attempts to address all but one of the COMMENTs and  
DISCUSSes raised during the IESG evaluation of TURN. The only one not  
addressed is the DISCUSS suggesting that security be mandatory for  
servers -- this topic is currently being discussed on a separate  
thread on the mailing list.

I would like to call the WG's attention to the following two technical  
changes made in this version:

    o  Reworded the text in Section 6.2 and Section 7.2 to more clearly
       describe how the allocation lifetime is computed in the case  
where
       a client requests a lifetime that is greater than both the  
default
       lifetime and the server's maximum allowed lifetime.

    o  In Section 6.2, swapped the steps that check the RESERVATION- 
TOKEN
       and EVEN-PORT attributes to correctly handle the case where an
       Allocate request contains both attributes.  The new text  
correctly
       returns 400 Bad Request in this case.

These two changes were made to fix two bugs in the spec found by  
Robert Sparks. Please review to make sure no new bugs were introduced.

I would also like to call the WG's attention to a significant rewrite  
in the Overview section:

    o  The former "Other Features" section of the Overview has been
       replaced with a series of sections describing various secondary
       features of TURN, and the text describing and motivating these
       secondary features has been expanded.  As a part of this rewrite,
       there is now a section that describes how to avoid IP
       fragmentation when using TURN.

The main goal of this rewrite was to address a comment by Lars Eggert  
about avoiding IP fragmentation, but I ended up making some changes to  
the surrounding text to motive other minor features.

Other changes introduced in this version:

    o  In Section 8, changed the term "default permission lifetime" to
       "Permission Lifetime" to make it clearer that the lifetime of a
       permission is not configurable.

    o  Added text in the Overview section to describe why various timer
       values were chosen.

    o  Added a sentence to the IAB consideration section saying that the
       disappearance of NATs in the near-term seems unlikely.

    o  The former "Other Features" section of the Overview has been
       replaced with a series of sections describing various secondary
       features of TURN, and the text describing and motivating these
       secondary features has been expanded.  As a part of this rewrite,
       there is now a section that describes how to avoid IP
       fragmentation when using TURN.

    o  Added some additional text in the Overview to explain how a  
client
       would select between UDP, TCP, and TLS transport.

    o  Fixed various minor typos.

Comments on this new version are welcome.

- Philip


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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Behavior Engineering for Hindrance Avoidance Working Group of the IETF.


	Title           : Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)
	Author(s)       : J. Rosenberg, et al.
	Filename        : draft-ietf-behave-turn-14.txt
	Pages           : 79
	Date            : 2009-04-12

If a host is located behind a NAT, then in certain situations it can
be impossible for that host to communicate directly with other hosts
(peers).  In these situations, it is necessary for the host to use
the services of an intermediate node that acts as a communication
relay.  This specification defines a protocol, called TURN (Traversal
Using Relays around NAT), that allows the host to control the
operation of the relay and to exchange packets with its peers using
the relay.  TURN differs from some other relay control protocols in
that it allows a client to communicate with multiple peers using a
single relay address.

The TURN protocol was designed to be used as part of the ICE
(Interactive Connectivity Establishment) approach to NAT traversal,
though it can be also used without ICE.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-behave-turn-14.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.

--NextPart
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From philip_matthews@magma.ca  Mon Apr 13 00:47:08 2009
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It was just brought to my attention that the following URL provides a  
convenient way of seeing the diffs between TURN-14 and the previous  
version:

http://tools.ietf.org/rfcdiff?url2=draft-ietf-behave-turn-14

- Philip



From philip_matthews@magma.ca  Mon Apr 13 01:06:04 2009
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On Fri, 10-Apr-09, at 18:06 , Craig, Dave wrote:

> What about keeping the Short-Term Credential, but adding a security  
> consideration that a TURN usage should keep a short-term credential  
> alive as long as the TURN server keeps a Nonce alive?

Sorry, but I am not following this. (I assume you mean "Long-Term"  
rather than "Short-Term" credential, but even with this change I am  
not following your idea).

- Philip


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On Wed, 8-Apr-09, at 11:43 , Matthew Kaufman wrote:

> Adobe Flash Player 10.0 (installed on over 55% of all Internet- 
> connected personal computers as of December 2008, the last month for  
> which I can talk about statistics) implements TURN draft-08 WITHOUT  
> long-term credentials.
>
> This was done at the request of IT departments which wish to enable  
> Flash Player's UDP-based RTMFP protocol without opening their  
> firewall to all UDP traffic. This permits them to separately manage  
> that traffic and log usage, just like an HTTP proxy does. And like  
> their HTTP proxy, they don't particularly care about individual user  
> authentication. They know that things like 802.1X, tight control  
> over system software installation, and the ability to terminate  
> people who don't comply with IT policies means that they have  
> sufficient controls over how the internal network is used and how it  
> connects to the Internet. Requiring configuration of individual  
> credentials would be an impediment to deployment.

Where is the TURN server itself deployed? Behind a corporate firewall,  
or in the Internet itself? If the latter, then how do you protect this  
server?



>
> The most common request is for DHCP-based or similar autodiscovery  
> of the proxy, and it would be even more difficult to add this while  
> requiring individual clients to authenticate. (Where would they  
> automatically get their credentials from?)

I agree that this would be a nice extension. There has been a little  
thought on anycast discovery of TURN servers, but no one has written  
up a concrete proposal yet.

- Philip

From philip_matthews@magma.ca  Mon Apr 13 01:21:46 2009
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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 From the responses right now, I am seeing a rough consensus to the  
spec saying that:

   TURN servers MUST implement the Long-Term Credential mechanism and  
SHOULD use it

with one significant comment about a large deployment that doesn't use  
security and says that it is not needed.

- Philip



From marcelo@it.uc3m.es  Mon Apr 13 02:42:47 2009
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Cc: Hiroshi MIYATA , Behave Chairs , Behave WG , Fred Baker 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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this makes sense to me
regards, marcelo


Xing Li escribió:
> Brian E Carpenter 写é“:
>>
>> Agreed that it would be a very bad idea. But I don't understand
>> why it would happen. It doesn't happen with 2002::/8.
>> Actually the analysis in RFC3056 states that this WKP can only be used
>> safely if the IPv4 network is not fragmented, i.e. you MUST NOT
>> use 6to4 after the IPv4 global routing breaks up (in 500 years
>> from now?). There would need to be a similar rule for a NAT64 WKP,
>> I think.
>>  
>> And the same practice would need to be used for the WKP: more specifics
>> not allowed. BTW that might recreate some of the black hole issues
>> we see for 6to4. So maybe a WKP is not such a good idea.
>>
>>     Brian
>>
>>
>>   
> I see the point now. But in the stateless mode, the effect to the 
> global IPv6 Internet makes the difference.
>
>   For the IPv6 Internet to an IPv4-network scenario, the WKP doesn't
>   work if the IPv4 is using private IPv4 addresses.  With public IPv4
>   addresses, each IPv4 site will inject a route in the IPv6 routing
>   table, i.e. importing IPv4 routing table entropy into IPv6 routing
>   table.  Therefore, the LIR should be selected.
>
>   For "an IPv4 network to IPv4 Internet" scenario, as shown in the
>   following Figure, the stateless and stateful mode should be discussed
>   separately"
>
>            ------                        -----           ------
>          /  The   \       -----        /  An   \       /  The   \
>         |  IPv4    |-----|Xlate|------|  IPv6   |-----|  IPv6    |
>          \Internet/       -----        \Network/       \Internet/
>            ------                        -----           ------
>                                   A                 B
>
>                  Figure: An IPv4 network to IPv4 Internet
>
>   1.  If Xlate is stateless, "an IPv6 network" will consist of hosts
>   using IVI6 addresses (more specifics of the IPv4 embedded IPv6
>   addresses).  The IVI6 hosts can communicate with both the global IPv4
>   Internet and the global IPv6 Internet.  The stateless Xlate supports
>   both IPv6 initiated communication and the IPv4 initiated
>   communications.
>
>   1.1 In border A, "an IPv6 network" will advertise IVI6 addresses to
>   the Xlate and the Xlate will advertise the IPv4 embedded IPv6
>   addresses corresponding to 0.0.0.0/0 to "an IPv6 network".
>
>   1.2 In border B, "an IPv6 network" will advertise IVI6 addresses with
>   proper aggregation to the IPv6 Internet and the IPv6 Internet will
>   advertise the global IPv6 routing table or 2000::/3 to "an IPv6
>   network".  In other words, "an IPv6 network" should advertise the
>   aggregated prefix of "an IPv6 network" and should neither advertise
>   the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 nor IVI6.
>   This can be achieved easily if LIR is used, but cannot be achieved if
>   WKP is used, since WKP is independent of the aggregated prefix of "an
>   IPv6 network".  In the case when WKP is used, the IVI6 must be
>   advertised to the IPv6 Internet in order to communicate with other
>   IPv6 hosts in the IPv6 Internet and this advertisement will
>   eventually result in the injecting of the global IPv4 routing table
>   into the global IPv6 routing system.
>
>   2.  If Xlate is stateful, "an IPv6 network" will consist of ordinary
>   IPv6 addresses and Xlate maintains session-initiated states to map
>   between ordinary IPv6 addresses and the IPv4 addresses in the IPv4
>   address pool.  The stateful Xlate only supports IPv6 initiated
>   communication.
>
>   2.1 In border A, "an IPv6 network" will advertise the aggregated
>   prefix of "an IPv6 network" to the Xlate and the Xlate will advertise
>   the IPv4 embedded IPv6 addresses corresponding to 0.0.0.0/0 to "an
>   IPv6 network".
>
>   2.2 In border B, "an IPv6 network" will advertise the aggregated
>   prefix of "an IPv6 network" to the IPv6 Internet and the IPv6
>   Internet will advertise the global IPv6 routing table or 2000::/3 to
>   "an IPv6 network".  There is no need to advertise the IPv4 embedded
>   IPv6 addresses corresponding to 0.0.0.0/0 to the IPv6 Internet, if
>   translation service of "an IPv6 Internet" is not supported to other
>   IPv6 networks.  Therefore, the selection of WKP versus LIR is mainly
>   the operational consideration.
>
> Please comment.
>
> xing
>
>
>


From marcelo@it.uc3m.es  Mon Apr 13 02:43:30 2009
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Brian E Carpenter escribió:
>
>
> And the same practice would need to be used for the WKP: more specifics
> not allowed. BTW that might recreate some of the black hole issues
> we see for 6to4. 

could you expand on how this would be?

Regards, marcelo
>
>
>   


From marcelo@it.uc3m.es  Mon Apr 13 02:44:45 2009
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Brian E Carpenter escribió:
>
>  But I'm pretty sure we need to
> add an adapted version of the following rules from RFC3056:
>
>    6to4 prefixes more specific than 2002::/16 must not be propagated in
>    native IPv6 routing, to prevent pollution of the IPv6 routing table
>    by elements of the IPv4 routing table.  Therefore, a 6to4 site which
>    also has a native IPv6 connection MUST NOT advertise its 2002::/48
>    routing prefix on that connection, and all native IPv6 network
>    operators MUST filter out and discard any 2002:: routing prefix
>    advertisements longer than /16.
>   

I agree with this text

Regards, marcelo

From marcelo@it.uc3m.es  Mon Apr 13 02:49:33 2009
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Cc: Behave WG , Philip Matthews , Fred Baker 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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Keith,

Keith Moore escribió:
>>>>> Personally, the only sense that I think the magic prefix should be a
>>>>> "default" is in the sense of "last resort".  As in, you SHOULD use an
>>>>> LIR prefix, and all of the relevant protocols and software need to
>>>>> accommodate the ability to configure that LIR prefix.  But if for some
>>>>> reason you actually think you want to use a magic prefix, please use
>>>>> this one allocated by IANA for that purpose, rather than (say) pulling
>>>>> one out of thin air, or using a prefix allocated for a different
>>>>> purpose.
>>>>>           
>>>> If the working group would like me to word it that way, I'm OK with
>>>> that.
>>>>         
>> My sense is: this is the prefix a device should use if the device does
>> not have an LIR prefix. A device may obtain an LIR prefix in a number of
>> ways (configuration, DHCP, ...) but if none of those ways are giving it
>> a LIR prefix, then it should use the default.
>>     
>
> I think that's a bit too strong, especially if we believe that using a
> single, distinguished prefix could do harm.
>   
how do you think the WK prefix can do harm in the restricted scenario 
that is being proposed, namely, the IPv6 network to the IPv4 internet case?

Regards, marcelo


> Keith
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>
>   


From marcelo@it.uc3m.es  Mon Apr 13 03:09:37 2009
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Fred Baker escribió:
>
> On Mar 25, 2009, at 7:02 PM, Magnus Westerlund wrote:
>> Okay, I totally have missed the reference to statefull in the SIIT
>> update. I don't think the SIIT document covers all the parts necessary
>> for stateful translation. There are additional considerations due to the
>> port overloading. Thus the requirements that exist for NAT44 do apply to
>> this type of stateful translation.
>>
>> In my view it is not simply handling state that is necessary in the
>> stateful translator document. The suggested title seems very restricted.
>>
>> Are you suggesting that we expand the SIIT update document to contain
>> all the stateful packet translation rules?
>
>
> On Mar 25, 2009, at 7:09 PM, marcelo bagnulo braun wrote:
>> my take on this is that the nat64 draft would rely in the statefull 
>> draft in the same way natpt relied on SIIIT.
>
>
>
> Marcelo, maybe you could comment in more detail here. What do you see 
> the division as? In what way would you like to build on the 
> translation draft?
>
Sorry for the delay

So, basically, i see the SIITbis draft doing the stateless translations 
of the IP packet.
Essentially, SIITbis will define how to translate all the fields on the 
IP header except for the IP source and destination address and the ports.
The statefull draft will define how to translate address and ports for 
these packets in NAT64 devices.
In order to do that, state must be created maintained and discarded in 
some way, which is specified in the statefull draft.
So, it is both about maintaining a data base and using the information 
in it to translate the address and ports of the packets.
In particular, the base statefull draft will handle TCP UDP and ICMP 
(there are some ICMP messages that require state)


Does this makes sense?

Regards, marcelo




From wwaites@googlemail.com  Mon Apr 13 03:23:55 2009
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From: William Waites 
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Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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> But if for some reason you actually think you want to use
> a magic prefix, please use this one allocated by IANA for
> that purpose, rather than (say) pulling one out of thin air,
> or using a prefix allocated for a different purpose.

Current v6 implementations, standard configs, address selection
and such aside, it seems to me cleanest to try to encourage
the use of ::/96 since this is the "natural" embedding of the
v4 network space of 32 bit numbers in the 128 bit v6 space.

It just seems right to be able to type

    ping6 ::192.0.2.1

and have it do the right thing.

Using other prefixes seems like an ugly (though perhaps
necessary and by all means to be envisioned by the draft)
hack to me.

-w
-- 
William Waites
+49 30 8894 9942

From marcelo@it.uc3m.es  Mon Apr 13 08:03:36 2009
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Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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William Waites escribió:
>> But if for some reason you actually think you want to use
>> a magic prefix, please use this one allocated by IANA for
>> that purpose, rather than (say) pulling one out of thin air,
>> or using a prefix allocated for a different purpose.
>>     
>
> Current v6 implementations, standard configs, address selection
> and such aside,

but this is exactly the problem with this prefix
I mean, if we use ::/96 as the WK prefix, current rfc3484 default policy 
table will prefer ::/96 than ::ffff:0:0/96

This implies that translated connectivity will be preferred over native 
IPv4 connectivity and this exactly what we don't want afaict

Hence, the argument for having a new prefix for this.

Besides, i think that unless there is  clear benefit in reusing a 
prefix, we should stay away from reusing prefixes, since it may be 
possible that exisitng implementations handle them in particular ways.

regards, marcelo

>  it seems to me cleanest to try to encourage
> the use of ::/96 since this is the "natural" embedding of the
> v4 network space of 32 bit numbers in the 128 bit v6 space.
>
> It just seems right to be able to type
>
>     ping6 ::192.0.2.1
>
> and have it do the right thing.
>
> Using other prefixes seems like an ugly (though perhaps
> necessary and by all means to be envisioned by the draft)
> hack to me.
>
> -w
>   


From iljitsch@muada.com  Mon Apr 13 08:11:28 2009
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Subject: [BEHAVE] NAT64 fragmentation
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Hi all,

here is text about fragmentation that I've been working on for the  
NAT64 draft.

Comments are appreciated, especially about the choice for DF=0 <= 1280  
and DF=1 > 1280 byte packet sizes for IPv6->IPv4.

Iljitsch



Packet sizes

It's the job of the network layer to adapt to different maximum packet  
sizes as packets move through the network. There are three mechanisms  
that handle this: transport layer negotiations such as the TCP MSS  
option, path MTU discovery and fragmentation. The difference between  
the IPv4 and IPv6 header sizes requires some handling in a NAT64  
translator, and there are complications because of the differences  
between how IPv4 and IPv6 handle fragmentation, as well as the issue  
of how to demultiplex fragmented IPv4 packets.

There are two approaches to path MTU discovery and fragmentation when  
translating from IPv6 to IPv4:

1. Set DF to 0 in the translated packets. This avoids path MTU  
discovery issues but leads to significant numbers of fragments.

2. Set DF to 1 in the translated packets. This supports path MTU  
discovery on the IPv4 side so unnecessary fragments are avoided, but  
it doesn't address the issue that IPv6 hosts are not required to  
perform PMTUD when sending packets of 1280 bytes or smaller.

The choice made in this document is to support option 1 for packets  
upto 1280 bytes, and option 2 for packets larger than 1280 bytes.

A NAT64 translator MUST have an MTU of at least 1280 on all of its  
interfaces, both IPv4 and IPv6 interfaces.

TCP MSS option

The TCP MSS option [RFC 793] is used during the three-way handshake by  
the two hosts involved to inform each other about the maximum TCP  
segment size (assuming IP and TCP headers without options) that the  
host can receive.

In practice, the MSS option is often used to make TCP work in the  
presence of broken path MTU discovery.

To avoid unnecessary path MTU discovery cycles, a NAT64 SHOULD rewrite  
the MSS option in SYN packets to the minimum of the original MSS  
option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU on  
the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6  
direction and the IPv6-to-IPv4 direction.

Path MTU discovery

The vast majority of both IPv4 and IPv6 hosts use path MTU discovery  
[RFC 1191] [RFC 1981]. With IPv4, PMTUD can be enabled on a per-packet  
basis by setting the DF bit to 1. With IPv6, there is no need for  
PMTUD for packets up to 1280 bytes because all IPv6 hosts are required  
to be able to receive 1280-byte packets without fragmentation. When  
sending larger packets, IPv6 hosts implicitly use PMTUD.

IPv6-to-IPv4

If the NAT64 has the same MTUs on its IPv6 and IPv4 interfaces, it  
will never have to generate "packet too big" messages for incoming  
IPv6 packets because the translation from IPv6 to IPv4 reduces the  
packet size by 20 bytes, more if the IPv6 packet has extension headers  
that are removed during the translation, such as the fragment header.  
If the MTU on the IPv6 side is larger than 1280 bytes and more than 20  
bytes smaller than the MTU on the IPv4 side, the NAT64 MUST generate  
the appropriate "packet too big" messages on the IPv6 side.

To support PMTUD, for translated packets that are larger than 1260  
bytes on the IPv4 side (1280 bytes IPv6 packets with 20 byte size  
reduction through the translation), the DF bit is set to 1 in the  
resulting IPv4 packet.

IPv4 routers may generate "packet too big" messages indicating a  
supported MTU size smaller than 1280 bytes. In those cases, the IPv6  
hosts will continue to send packets larger than what the IPv4 path MTU  
can support. To allow packets to be delivered successfully in this  
case, the DF bit is set to 0 in all translated packets smaller than or  
equal to 1260 bytes, to allow these packets to be fragmented in the  
IPv4 network.

Note: it is highly recommended for IPv4 hosts running services that  
may be used by IPv6 clients through a NAT64 translator to use an MTU  
size of at least 1260 bytes and to properly generate "packet too big"  
messages.

When a NAT64 translates "packet too big" messages from IPv6 to IPv4,  
it adjusts the advertised MTU to the minimum of the original  
advertised MTU + 20, the NAT64's MTU on the IPv6 side + 20 and the  
NAT64's MTU on the IPv4 side.

IPv4-to-IPv6

Because it may be necessary to include a fragmentation header or other  
extension header, the NAT64 MUST be prepared to generate "packet too  
big" messages for packets with the DF bit set to 1 received from the  
IPv4 side, regardless of the MTU sizes on the IPv4 and IPv6  
interfaces. If the packet is larger than can be transmitted on the  
IPv6 side after translation, the NAT64 returns a "packet too big"  
message indicating the maximum IPv4 packet size that would be  
supported using the same translation as the current packet. This can  
be calculated as IPv4-packet-size - (IPv6-packet-size - IPv6-total- 
length) + 20.

When a NAT64 translates "packet too big" messages from IPv4 to IPv6,  
it adjusts the advertised MTU to the minimum of the original  
advertised MTU - 20, the NAT64's MTU on the IPv6 side and the NAT64's  
MTU on the IPv4 side - 20. However, if the advertised MTU in "packet  
too big" messages is smaller than 1260 bytes, the value put into the  
translated "packet too big" message is 1280. This makes sure that the  
IPv6 host will limit its packet sizes to 1280 bytes, so its packets  
are subsequently translated into IPv4 packets with DF set to 0. (This  
deviates from [RFC 2765].)

Fragmentation

Because NAT deviates from normal router behavior, the limitation that  
IPv6 packets or IPv4 packets with DF set to 1 are not fragmented by  
routers doesn't apply to a NAT64 translator. Where appropriate, these  
packets are fragmented after translation as described below.

Demultiplexing

Because NAT64 provides a stateful many-to-one (perhaps even many-to- 
many) translation, it is necessary to recognize which session a given  
packet belongs to. For this, the TCP or UDP port numbers must be  
known, but these only occur in the first fragment of a fragmented  
packet. There are two possible ways to deal with this:

1. Reassemble the packet before translating it.

2. Create translation state for the fragments belonging to the same  
packet so each packet can be translated.

Strategy 2 is attractive in large installations because it requires  
less storage and processing. However, it may still be necessary to  
buffer fragments for some time, as the fragment containing the first  
part of the packet (and with that, the port numbers) may not be the  
first one to arrive.

Note: based on the assumptions that hosts generate fragments in-order  
and that reordering must happen through parallel network links and  
that the path between these parallel links and a NAT64 supports speeds  
of at least 10 Mbps, there is a very high probability that two out-of- 
order fragments making up a packet will arrive at the NAT64 within 50  
to 100 milliseconds. Further assuming that fragmented traffic makes up  
less than 10% of all traffic, this only requires a buffer of 6 to  
12,500 fragments (50 ms at 10 Mbps to 100 ms at 10 Gbps).

In some cases, especially in the IPv6-to-IPv4 direction, there may  
only be a single session matching the fragment's source and  
destination addresses and protocol number. In these cases, it would be  
possible to translate the fragments out-of-order. A NAT64 translator  
MAY do this for TCP, however, it MUST NOT translate UDP packets before  
the first fragment is available. The reason for this is that the  
fragment could be part of a packet setting up a new session. However,  
with TCP session establishment packets don't carry data, so it's  
extremely unlikely that they are fragmented. This is not the case with  
UDP, and in the IPv4-to-IPv6 direction, a UDP packet may have a zero  
checksum, which must be recalculated when translating to IPv6, for  
which the entire packet must be available.

IPv6-to-IPv4

For all IPv4 packets that the NAT64 creates through translation, the  
translator generates an ID value. This applies to all packets,  
regardless of their size or the value of the DF field. A NAT64  
translator MAY employ strategies to avoid reusing an ID value for a  
certain source, destination, protocol tuple as long as possible. If  
the IPv4 packets are fragments of an IPv6 packet, then state is  
created that makes it possible for all the fragments to have the same  
ID value on the IPv4 side.

[RFC 2765] specifies copying the lower bits from the IPv6 ID field in  
a fragment header (if present) to the IPv4 ID field, but this runs the  
risk of two IPv6 hosts talking to the same IPv4 destination through  
the NAT64 using the same ID value.

Otherwise, when translating IPv6 packets with a fragmentation header,  
the fragments are translated as per [RFC 2765].

IPv4-to-IPv6

Because packets coming in on the IPv4 side may be larger than 1280  
bytes after translation, a NAT64 MUST implement PMTUD on the IPv6  
side. In other words, it must react to "packet too big" messages for  
any IPv6 destination that it communicates with by limiting the size of  
the packets that it sends to the advertised maximum.

In the case where, after translation from IPv4 to IPv6, a packet is  
larger than a destination's PMTU, the NAT64 returns a "packet too big"  
as outlined earlier in the case that the DF bit was set to 1 in the  
IPv4 packet. If the DF bit was set to 0, the translator first  
translates the IPv4 packet, and then fragments the resulting IPv6  
packets using normal IPv6 fragmentation rules. The value in the ID  
field is generated locally by the NAT64. If the IPv4 packet was a  
fragment, state is created that allows the same ID value to be used  
for all IPv6 packets or fragments that are part of the same original  
IPv4 packet.


From dwcraig@qualcomm.com  Mon Apr 13 13:46:15 2009
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From: "Craig, Dave" 
To: Philip Matthews 
Date: Mon, 13 Apr 2009 13:47:17 -0700
Thread-Topic: [BEHAVE] TURN: Make Security a MUST for servers?
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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> -----Original Message-----
> From: Philip Matthews [mailto:philip_matthews@magma.ca]
> Sent: Monday, April 13, 2009 1:07 AM
> To: Craig, Dave
> Cc: Behave WG
> Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
>=20
>=20
> On Fri, 10-Apr-09, at 18:06 , Craig, Dave wrote:
>=20
> > What about keeping the Short-Term Credential, but adding a security
> > consideration that a TURN usage should keep a short-term credential
> > alive as long as the TURN server keeps a Nonce alive?
>=20
> Sorry, but I am not following this. (I assume you mean "Long-Term"
> rather than "Short-Term" credential, but even with this change I am
> not following your idea).
>=20
> - Philip

I had thought the MUST was on using long-term credential not just on having=
 to implement it.  Nevertheless, if I have a TURN server implementation tha=
t rotates the short-term credentials frequently, why do I need to implement=
 long-term credentials?

Thanks,
Dave

From matthew@matthew.at  Mon Apr 13 14:50:08 2009
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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Philip Matthews wrote:
>
> Where is the TURN server itself deployed? Behind a corporate firewall, 
> or in the Internet itself? If the latter, then how do you protect this 
> server?
>
We've seen two different architectures that people have talked to us about:

1) The TURN server has multiple network interfaces. An interface on a 
trusted network talks to TURN clients. Another interface is in a 
semi-trusted DMZ zone and is only for the unencapsulated packets.

2) The TURN server has a single network interface. The interface is in a 
more-internal DMZ of multiple layers of DMZ. There are specific firewall 
rules allowing it, and only it, from only its interface, to talk UDP to 
the outside world and this is via a stateful firewall so that only 
sessions it initiates can go outbound. The TURN port, specifically, is 
blocked inbound. There are other firewall rules allowing internal hosts 
to access the box, only at the TURN port. Again, this is a stateful 
firewall, so things on the inside must initiate connections towards the 
TURN server.

Basically the trust model is the same as the HTTP proxy used to be, back 
before bump-on-the-wire transparent HTTP proxies were invented. The 
company doesn't particularly care which employee is using it or for 
what, but wants to be able to log the traffic as it goes through a very 
narrow bottleneck, and wants to be able to subscribe to blacklists that 
interface with the proxy to turn off reachability to specific "bad" 
addresses if necessary.

Matthew Kaufman

From dwing@cisco.com  Mon Apr 13 16:32:03 2009
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Subject: Re: [BEHAVE] NAT64 fragmentation
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> -----Original Message-----
> From: behave-bounces@ietf.org 
> [mailto:behave-bounces@ietf.org] On Behalf Of Iljitsch van Beijnum
> Sent: Monday, April 13, 2009 8:12 AM
> To: Behave WG
> Subject: [BEHAVE] NAT64 fragmentation
> 
> Hi all,
> 
> here is text about fragmentation that I've been working on for the  
> NAT64 draft.
> 
> Comments are appreciated, especially about the choice for 
> DF=0 <= 1280  
> and DF=1 > 1280 byte packet sizes for IPv6->IPv4.


(Not as chair.)

Lots of your text seems redundant with draft-baker-behave-v4v6-translation-02,
for example Section 2 which includes:

   When the IPv4 node performs path MTU discovery (by setting the DF bit
   in the header) the path MTU discovery can operate end-to-end i.e.
   across the translator.  In this case either IPv4 or IPv6 routers
   might send back ICMP "packet too big" messages to the sender.  When
   these ICMP errors are sent by the IPv6 routers they will pass through
   a translator which will translate the ICMP error to a form that the
   IPv4 sender can understand.  In this case an IPv6 fragment header is
   only included if the IPv4 packet is already fragmented.

   However, when the IPv4 sender does not perform path MTU discovery the
   translator has to ensure that the packet does not exceed the path MTU
   on the IPv6 side.  This is done by fragmenting the IPv4 packet so
   that it fits in 1280 byte IPv6 packet since IPv6 guarantees that 1280
   byte packets never need to be fragmented.  Also, when the IPv4 sender
   does not perform path MTU discovery the translator MUST always
   include an IPv6 fragment header to indicate that the sender allows
   fragmentation.  That is needed should the packet pass through an IP/
   ICMP translator.

but there are other places in draft-baker-behave-v4v6-translation-02 where
fragmentation is discussed (e.g., section 3).  I expect the stateful
translation document only needs to discuss unique aspects about fragmenting
that relate to stateful translation.


A few comments below.


> Iljitsch
> 
> 
> 
> Packet sizes
> 
> It's the job of the network layer to adapt to different 
> maximum packet  
> sizes as packets move through the network. There are three 
> mechanisms  
> that handle this: transport layer negotiations such as the TCP MSS  
> option, path MTU discovery and fragmentation. The difference between  
> the IPv4 and IPv6 header sizes requires some handling in a NAT64  
> translator, and there are complications because of the differences  
> between how IPv4 and IPv6 handle fragmentation, as well as the issue  
> of how to demultiplex fragmented IPv4 packets.
> 
> There are two approaches to path MTU discovery and 
> fragmentation when  
> translating from IPv6 to IPv4:
> 
> 1. Set DF to 0 in the translated packets. This avoids path MTU  
> discovery issues but leads to significant numbers of fragments.
> 
> 2. Set DF to 1 in the translated packets. This supports path MTU  
> discovery on the IPv4 side so unnecessary fragments are avoided, but  
> it doesn't address the issue that IPv6 hosts are not required to  
> perform PMTUD when sending packets of 1280 bytes or smaller.
> 
> The choice made in this document is to support option 1 for packets  
> upto 1280 bytes, and option 2 for packets larger than 1280 bytes.
> 
> A NAT64 translator MUST have an MTU of at least 1280 on all of its  
> interfaces, both IPv4 and IPv6 interfaces.
> 
> TCP MSS option
> 
> The TCP MSS option [RFC 793] is used during the three-way 
> handshake by  
> the two hosts involved to inform each other about the maximum TCP  
> segment size (assuming IP and TCP headers without options) that the  
> host can receive.
> 
> In practice, the MSS option is often used to make TCP work in the  
> presence of broken path MTU discovery.
> 
> To avoid unnecessary path MTU discovery cycles, a NAT64 
> SHOULD rewrite  
> the MSS option in SYN packets to the minimum of the original MSS  
> option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU on  
> the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6  
> direction and the IPv6-to-IPv4 direction.

I noticed that draft-baker-behave-v4v6-translation-02 doesn't mention anything
about TCP MSS.  I wonder if it should or if we want expect only a stateful
translator to benefit from adjusting TCP MSS?  It does not require state to
rewrite TCP MSS.


> Path MTU discovery
> 
> The vast majority of both IPv4 and IPv6 hosts use path MTU discovery  
> [RFC 1191] [RFC 1981]. With IPv4, PMTUD can be enabled on a 
> per-packet  
> basis by setting the DF bit to 1. With IPv6, there is no need for  
> PMTUD for packets up to 1280 bytes because all IPv6 hosts are 
> required  
> to be able to receive 1280-byte packets without fragmentation. When  
> sending larger packets, IPv6 hosts implicitly use PMTUD.
> 
> IPv6-to-IPv4
> 
> If the NAT64 has the same MTUs on its IPv6 and IPv4 interfaces, it  
> will never have to generate "packet too big" messages for incoming  
> IPv6 packets because the translation from IPv6 to IPv4 reduces the  
> packet size by 20 bytes, more if the IPv6 packet has 
> extension headers  
> that are removed during the translation, such as the fragment 
> header.  
> If the MTU on the IPv6 side is larger than 1280 bytes and 
> more than 20  
> bytes smaller than the MTU on the IPv4 side, the NAT64 MUST generate  
> the appropriate "packet too big" messages on the IPv6 side.
> 
> To support PMTUD, for translated packets that are larger than 1260  
> bytes on the IPv4 side (1280 bytes IPv6 packets with 20 byte size  
> reduction through the translation), the DF bit is set to 1 in the  
> resulting IPv4 packet.
> 
> IPv4 routers may generate "packet too big" messages indicating a  
> supported MTU size smaller than 1280 bytes. In those cases, the IPv6  
> hosts will continue to send packets larger than what the IPv4 
> path MTU  
> can support. To allow packets to be delivered successfully in this  
> case, the DF bit is set to 0 in all translated packets 
> smaller than or  
> equal to 1260 bytes, to allow these packets to be fragmented in the  
> IPv4 network.

That paragraph needs to be turned into a requirement for the 
implementation.  I believe something like this would be what you
need,

  To allow packets to be delivered successfull in this case,
  the NAT64 notices the 'packet too big' ICMP error has a 
  'Next-Hop MTU' field less than 1280 (including a Next-Hop MTU 
  of zero) and then, for the duration of that flow, it MUST 
  forward packets on the IPv4 network with DF=0.

This seems a feature exclusive to a stateful translator.

> Note: it is highly recommended for IPv4 hosts running services that  
> may be used by IPv6 clients through a NAT64 translator to use an MTU  
> size of at least 1260 bytes and to properly generate "packet 
> too big" messages.
> 
> When a NAT64 translates "packet too big" messages from IPv6 to IPv4,  
> it adjusts the advertised MTU to the minimum of the original  
> advertised MTU + 20, the NAT64's MTU on the IPv6 side + 20 and the  
> NAT64's MTU on the IPv4 side.
> 
> IPv4-to-IPv6
> 
> Because it may be necessary to include a fragmentation header 
> or other  
> extension header, the NAT64 MUST be prepared to generate "packet too  
> big" messages for packets with the DF bit set to 1 received from the  
> IPv4 side, regardless of the MTU sizes on the IPv4 and IPv6  
> interfaces. If the packet is larger than can be transmitted on the  
> IPv6 side after translation, the NAT64 returns a "packet too big"  
> message indicating the maximum IPv4 packet size that would be  
> supported using the same translation as the current packet. This can  
> be calculated as IPv4-packet-size - (IPv6-packet-size - IPv6-total- 
> length) + 20.
> 
> When a NAT64 translates "packet too big" messages from IPv4 to IPv6,  
> it adjusts the advertised MTU to the minimum of the original  
> advertised MTU - 20, the NAT64's MTU on the IPv6 side and the 
> NAT64's  
> MTU on the IPv4 side - 20. However, if the advertised MTU in "packet  
> too big" messages is smaller than 1260 bytes, the value put into the  
> translated "packet too big" message is 1280. This makes sure 
> that the  
> IPv6 host will limit its packet sizes to 1280 bytes, so its packets  
> are subsequently translated into IPv4 packets with DF set to 
> 0. (This  
> deviates from [RFC 2765].)
> 
> Fragmentation
> 
> Because NAT deviates from normal router behavior, the 
> limitation that  
> IPv6 packets or IPv4 packets with DF set to 1 are not fragmented by  
> routers doesn't apply to a NAT64 translator. Where 
> appropriate, these  
> packets are fragmented after translation as described below.
> 
> Demultiplexing
> 
> Because NAT64 provides a stateful many-to-one (perhaps even many-to- 
> many) translation, it is necessary to recognize which session 
> a given  
> packet belongs to.

The many-to-one translation appears also true of the stateless 
mode, per 
http://tools.ietf.org/html/draft-xli-behave-ivi-01#section-5.1
which states, in part:

   To further increase the utilization ratio of the public IPv4
   addresses, the port multiplexing inside the ISP(i)'s /32 can be
   deployed [RFC2766] [RFC4966].  This is to say that a single IPv4
   address (IVI4(i)) can be used for multiple IVI6(i) addresses.  The
   mapping scheme is to use the least significant bits in the IVI6(i) to
   define the multiple mapping and combine the transport-layer port
   number to perform uniquely the mapping from IVI4(i) to IVI6(i).

Which, if it is still being pursued for standardization would be
text that should be in the stateless document.

However, I don't see a similar description in Fred's IVI document
(draft-baker-behave-ivi-01) nor in the translation 
(draft-baker-behave-v4v6-translation-02) or framework
(draft-baker-behave-v4v6-framework-02) documents -- so maybe the
idea has been abandoned for standardization.  I'm not sure.  

> For this, the TCP or UDP port numbers must be  
> known, but these only occur in the first fragment of a fragmented  
> packet. There are two possible ways to deal with this:
> 
> 1. Reassemble the packet before translating it.
> 
> 2. Create translation state for the fragments belonging to the same  
> packet so each packet can be translated.
> 
> Strategy 2 is attractive in large installations because it requires  
> less storage and processing. However, it may still be necessary to  
> buffer fragments for some time, as the fragment containing the first  
> part of the packet (and with that, the port numbers) may not be the  
> first one to arrive.
> 
> Note: based on the assumptions that hosts generate fragments 
> in-order  
> and that reordering must happen through parallel network links and  
> that the path between these parallel links and a NAT64 
> supports speeds  
> of at least 10 Mbps, there is a very high probability that 
> two out-of- 
> order fragments making up a packet will arrive at the NAT64 
> within 50  
> to 100 milliseconds. Further assuming that fragmented traffic 
> makes up  
> less than 10% of all traffic, this only requires a buffer of 6 to  
> 12,500 fragments (50 ms at 10 Mbps to 100 ms at 10 Gbps).
> 
> In some cases, especially in the IPv6-to-IPv4 direction, there may  
> only be a single session matching the fragment's source and  
> destination addresses and protocol number. In these cases, it 
> would be  
> possible to translate the fragments out-of-order. A NAT64 translator  
> MAY do this for TCP, however, it MUST NOT translate UDP 
> packets before  
> the first fragment is available. The reason for this is that the  
> fragment could be part of a packet setting up a new session. 
> However,  
> with TCP session establishment packets don't carry data, so it's  
> extremely unlikely that they are fragmented. This is not the 
> case with  
> UDP, and in the IPv4-to-IPv6 direction, a UDP packet may have a zero  
> checksum, which must be recalculated when translating to IPv6, for  
> which the entire packet must be available.
> 
> IPv6-to-IPv4
> 
> For all IPv4 packets that the NAT64 creates through translation, the  
> translator generates an ID value. This applies to all packets,  
> regardless of their size or the value of the DF field. A NAT64  
> translator MAY employ strategies to avoid reusing an ID value for a  
> certain source, destination, protocol tuple as long as possible. If  
> the IPv4 packets are fragments of an IPv6 packet, then state is  
> created that makes it possible for all the fragments to have 
> the same  
> ID value on the IPv4 side.
> 
> [RFC 2765] specifies copying the lower bits from the IPv6 ID 
> field in  
> a fragment header (if present) to the IPv4 ID field, but this 
> runs the  
> risk of two IPv6 hosts talking to the same IPv4 destination through  
> the NAT64 using the same ID value.
> 
> Otherwise, when translating IPv6 packets with a fragmentation 
> header,  
> the fragments are translated as per [RFC 2765].

The text above should be rolled into the stateless translation
draft.

> IPv4-to-IPv6
> 
> Because packets coming in on the IPv4 side may be larger than 1280  
> bytes after translation, a NAT64 MUST implement PMTUD on the IPv6  
> side. In other words, it must react to "packet too big" messages for  
> any IPv6 destination that it communicates with by limiting 
> the size of  
> the packets that it sends to the advertised maximum.
> 
> In the case where, after translation from IPv4 to IPv6, a packet is  
> larger than a destination's PMTU, the NAT64 returns a "packet 
> too big"  
> as outlined earlier in the case that the DF bit was set to 1 in the  
> IPv4 packet. If the DF bit was set to 0, the translator first  
> translates the IPv4 packet, and then fragments the resulting IPv6  
> packets using normal IPv6 fragmentation rules. The value in the ID  
> field is generated locally by the NAT64. If the IPv4 packet was a  
> fragment, state is created that allows the same ID value to be used  
> for all IPv6 packets or fragments that are part of the same original  
> IPv4 packet.

-d


From philip_matthews@magma.ca  Mon Apr 13 18:44:30 2009
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Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
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On Mon, 13-Apr-09, at 16:47 , Craig, Dave wrote:

>> -----Original Message-----
>> From: Philip Matthews [mailto:philip_matthews@magma.ca]
>> Sent: Monday, April 13, 2009 1:07 AM
>> To: Craig, Dave
>> Cc: Behave WG
>> Subject: Re: [BEHAVE] TURN: Make Security a MUST for servers?
>>
>>
>> On Fri, 10-Apr-09, at 18:06 , Craig, Dave wrote:
>>
>>> What about keeping the Short-Term Credential, but adding a security
>>> consideration that a TURN usage should keep a short-term credential
>>> alive as long as the TURN server keeps a Nonce alive?
>>
>> Sorry, but I am not following this. (I assume you mean "Long-Term"
>> rather than "Short-Term" credential, but even with this change I am
>> not following your idea).
>>
>> - Philip
>
> I had thought the MUST was on using long-term credential not just on  
> having to implement it.  Nevertheless, if I have a TURN server  
> implementation that rotates the short-term credentials frequently,  
> why do I need to implement long-term credentials?

Mostly because TURN is currently specified to only uses the Long-Term  
Credential mechanism. That is not to say that using STUN's Short-Term  
Credential mechanism with TURN is impossible, but no one has written  
an I-D on how to do it.

- Philip

From lars.eggert@nokia.com  Tue Apr 14 07:11:57 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] TURN: Avoiding IP Fragmentation
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Hi,

I like this text, thanks! (And I cleared.)

Lars

On 2009-4-12, at 23:27, Philip Matthews wrote:

> As part of the IESG evaluation of TURN, Lars wrote:
>> Discuss:
>> Because TURN doesn't translate the ICMP messages necessary for PMTU
>> discovery,
>> persistent fragmentation can occur. When we discussed this in the
>> WG, I thought
>> we had come to an agreement that the document should say that TURN is
>> NOT RECOMMENDED for applications that exchange UDP packets larger  
>> than
>> the minimum PMTU (500-odd bytes), unless they implement RFC4821.
>
> Hi Lars:
>
> I don't actually remember this agreement, but I think it is a good
> point. I have tried to address it by rewriting the last part of the
> Overview section to include (amongst other changes) the following
> subsection:
>
> 2.7.  Avoiding IP Fragmentation
>
>    For reasons described in [Frag-Harmful], applications, especially
>    those sending large volumes of data, should try hard to avoid  
> having
>    their packets fragmented.  Applications using TCP can more-or-less
>    ignore this issue because fragmentation avoidance is now a standard
>    part of TCP, but applications using UDP (and thus any application
>    using this version of TURN) must handle fragmentation avoidance
>    themselves.
>
>    The application running on the client and the peer can take one of
>    two approaches to avoid IP fragmentation.
>
>    The first approach is to avoid sending large amounts of application
>    data in the TURN messages/UDP datagrams exchanged between the  
> client
>    and the peer.  This is the approach taken by most VoIP
>    (Voice-over-IP) applications.  In this approach, the application
>    exploits the fact that the IP specification [RFC0791] specifies  
> that
>    IP packets up to 576 bytes should never need to be fragmented.
>
>    The exact amount of application data that can be included while
>    avoiding fragmentation depends the details of the TURN session
>    between the client and the server: whether UDP, TCP, or TLS
> transport
>    is used, whether ChannelData messages or Send/Data indications are
>    used, and whether any additional attributes (such as the DONT-
>    FRAGMENT attribute) are included.  Another factor, which is hard to
>    determine, is whether the MTU is somewhere along the path is  
> reduced
>    for other reasons, such as the use of IP-in-IP tunneling.
>
>    As a guideline, sending a maximum of 500 bytes of application data
> in
>    a single TURN message (by the client on the client-to-server leg)  
> or
>    a UDP datagram (by the peer on the peer-to-server leg) will
> generally
>    avoid IP fragmentation.  To further reduce the chance of
>    fragmentation, it is recommended that the client use ChannelData
>    messages when transferring significant volumes of data, since the
>    overhead of the ChannelData message is less than Send and Data
>    indications.
>
>    The second approach the client and peer can take to avoid
>    fragmentation is to use a path MTU discovery algorithm to determine
>    the maximum amount of application data than can be sent without
>    fragmentation.
>
>    Unfortunately, because servers implementing this version of TURN do
>    not relay ICMP messages, the classic Path MTU Discovery algorithm
>    defined in [RFC1191] is not able to discover the MTU of the
>    transmission path between the client and the peer.  (Even if they
> did
>    relay ICMP messages, the algorithm would not always work since ICMP
>    messages are often filtered out by combined NAT/firewall devices).
>
>    So the client and server need to use a path MTU discovery algorithm
>    that does not require ICMP messages.  The Packetized Path MTU
>    Discovery algorithm defined in [RFC4821] is one such algorithm.
>
>    The details of how to use the algorithm of [RFC4821] with TURN are
>    still under investigation.  However, as a step towards this goal,
>    this version of TURN supports a DONT-FRAGMENT attribute.  When the
>    client includes this attribute in a Send indication, this tells the
>    server to set the DF bit in the resulting UDP datagram that it  
> sends
>    to the peer.  Since some servers may be unable to set the DF bit,
> the
>    client should also include this attribute in the Allocate request  
> --
>    any server that does not support the DONT-FRAGMENT attribute will
>    indicate this by rejecting the Allocate request.
>
> How does this sound? Do you think it provides enough guidance to
> application designers?
>
> The recommendation to send no more that 500 bytes came after I did a
> bit of math to see what the Path MTU might be in various situations.
> Depending on the situation, I got an application MTU ranging from 512
> (using Send/Data indications over UDP) to 544 (using ChannelData
> messages over UDP). To be conservative, I rounded these down to 500.
>
> The comment that we are still investigating the use of RFC4821 came
> from spending a bit of time thinking about how it might be used. I
> came up with a number of issues. One issue is that we have tried to
> allow TURN to be implemented in user space, and it seems (from e-mails
> to the mailing list about a year ago) that some operating systems
> don't support setting the DF bit by unprivileged applications. Another
> is that there are situations with ICE where two TURN relays end up
> talking with each other; in these situations, we don't currently have
> a way to determine the MTU of the last leg of the path. I have some
> ideas on how one might work around these issues, but I personally
> think these issues should be investigated as part of a separate
> document.
>
> - Philip
>


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From lars.eggert@nokia.com  Tue Apr 14 07:15:15 2009
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From: Lars Eggert 
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Cc: tcpm-chairs@tools.ietf.org, Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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Hi,

please run your proposal on TCP MSS clamping by the TCPM WG. I'm not  
aware of any existing RFC that describes/recommends this technique  
(although it's obviously implemented in some products), and we need to  
carefully discuss what we want to say here.

Lars

On 2009-4-13, at 18:12, Iljitsch van Beijnum wrote:

> Hi all,
>
> here is text about fragmentation that I've been working on for the
> NAT64 draft.
>
> Comments are appreciated, especially about the choice for DF=0 <= 1280
> and DF=1 > 1280 byte packet sizes for IPv6->IPv4.
>
> Iljitsch
>
>
>
> Packet sizes
>
> It's the job of the network layer to adapt to different maximum packet
> sizes as packets move through the network. There are three mechanisms
> that handle this: transport layer negotiations such as the TCP MSS
> option, path MTU discovery and fragmentation. The difference between
> the IPv4 and IPv6 header sizes requires some handling in a NAT64
> translator, and there are complications because of the differences
> between how IPv4 and IPv6 handle fragmentation, as well as the issue
> of how to demultiplex fragmented IPv4 packets.
>
> There are two approaches to path MTU discovery and fragmentation when
> translating from IPv6 to IPv4:
>
> 1. Set DF to 0 in the translated packets. This avoids path MTU
> discovery issues but leads to significant numbers of fragments.
>
> 2. Set DF to 1 in the translated packets. This supports path MTU
> discovery on the IPv4 side so unnecessary fragments are avoided, but
> it doesn't address the issue that IPv6 hosts are not required to
> perform PMTUD when sending packets of 1280 bytes or smaller.
>
> The choice made in this document is to support option 1 for packets
> upto 1280 bytes, and option 2 for packets larger than 1280 bytes.
>
> A NAT64 translator MUST have an MTU of at least 1280 on all of its
> interfaces, both IPv4 and IPv6 interfaces.
>
> TCP MSS option
>
> The TCP MSS option [RFC 793] is used during the three-way handshake by
> the two hosts involved to inform each other about the maximum TCP
> segment size (assuming IP and TCP headers without options) that the
> host can receive.
>
> In practice, the MSS option is often used to make TCP work in the
> presence of broken path MTU discovery.
>
> To avoid unnecessary path MTU discovery cycles, a NAT64 SHOULD rewrite
> the MSS option in SYN packets to the minimum of the original MSS
> option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU on
> the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6
> direction and the IPv6-to-IPv4 direction.
>
> Path MTU discovery
>
> The vast majority of both IPv4 and IPv6 hosts use path MTU discovery
> [RFC 1191] [RFC 1981]. With IPv4, PMTUD can be enabled on a per-packet
> basis by setting the DF bit to 1. With IPv6, there is no need for
> PMTUD for packets up to 1280 bytes because all IPv6 hosts are required
> to be able to receive 1280-byte packets without fragmentation. When
> sending larger packets, IPv6 hosts implicitly use PMTUD.
>
> IPv6-to-IPv4
>
> If the NAT64 has the same MTUs on its IPv6 and IPv4 interfaces, it
> will never have to generate "packet too big" messages for incoming
> IPv6 packets because the translation from IPv6 to IPv4 reduces the
> packet size by 20 bytes, more if the IPv6 packet has extension headers
> that are removed during the translation, such as the fragment header.
> If the MTU on the IPv6 side is larger than 1280 bytes and more than 20
> bytes smaller than the MTU on the IPv4 side, the NAT64 MUST generate
> the appropriate "packet too big" messages on the IPv6 side.
>
> To support PMTUD, for translated packets that are larger than 1260
> bytes on the IPv4 side (1280 bytes IPv6 packets with 20 byte size
> reduction through the translation), the DF bit is set to 1 in the
> resulting IPv4 packet.
>
> IPv4 routers may generate "packet too big" messages indicating a
> supported MTU size smaller than 1280 bytes. In those cases, the IPv6
> hosts will continue to send packets larger than what the IPv4 path MTU
> can support. To allow packets to be delivered successfully in this
> case, the DF bit is set to 0 in all translated packets smaller than or
> equal to 1260 bytes, to allow these packets to be fragmented in the
> IPv4 network.
>
> Note: it is highly recommended for IPv4 hosts running services that
> may be used by IPv6 clients through a NAT64 translator to use an MTU
> size of at least 1260 bytes and to properly generate "packet too big"
> messages.
>
> When a NAT64 translates "packet too big" messages from IPv6 to IPv4,
> it adjusts the advertised MTU to the minimum of the original
> advertised MTU + 20, the NAT64's MTU on the IPv6 side + 20 and the
> NAT64's MTU on the IPv4 side.
>
> IPv4-to-IPv6
>
> Because it may be necessary to include a fragmentation header or other
> extension header, the NAT64 MUST be prepared to generate "packet too
> big" messages for packets with the DF bit set to 1 received from the
> IPv4 side, regardless of the MTU sizes on the IPv4 and IPv6
> interfaces. If the packet is larger than can be transmitted on the
> IPv6 side after translation, the NAT64 returns a "packet too big"
> message indicating the maximum IPv4 packet size that would be
> supported using the same translation as the current packet. This can
> be calculated as IPv4-packet-size - (IPv6-packet-size - IPv6-total-
> length) + 20.
>
> When a NAT64 translates "packet too big" messages from IPv4 to IPv6,
> it adjusts the advertised MTU to the minimum of the original
> advertised MTU - 20, the NAT64's MTU on the IPv6 side and the NAT64's
> MTU on the IPv4 side - 20. However, if the advertised MTU in "packet
> too big" messages is smaller than 1260 bytes, the value put into the
> translated "packet too big" message is 1280. This makes sure that the
> IPv6 host will limit its packet sizes to 1280 bytes, so its packets
> are subsequently translated into IPv4 packets with DF set to 0. (This
> deviates from [RFC 2765].)
>
> Fragmentation
>
> Because NAT deviates from normal router behavior, the limitation that
> IPv6 packets or IPv4 packets with DF set to 1 are not fragmented by
> routers doesn't apply to a NAT64 translator. Where appropriate, these
> packets are fragmented after translation as described below.
>
> Demultiplexing
>
> Because NAT64 provides a stateful many-to-one (perhaps even many-to-
> many) translation, it is necessary to recognize which session a given
> packet belongs to. For this, the TCP or UDP port numbers must be
> known, but these only occur in the first fragment of a fragmented
> packet. There are two possible ways to deal with this:
>
> 1. Reassemble the packet before translating it.
>
> 2. Create translation state for the fragments belonging to the same
> packet so each packet can be translated.
>
> Strategy 2 is attractive in large installations because it requires
> less storage and processing. However, it may still be necessary to
> buffer fragments for some time, as the fragment containing the first
> part of the packet (and with that, the port numbers) may not be the
> first one to arrive.
>
> Note: based on the assumptions that hosts generate fragments in-order
> and that reordering must happen through parallel network links and
> that the path between these parallel links and a NAT64 supports speeds
> of at least 10 Mbps, there is a very high probability that two out-of-
> order fragments making up a packet will arrive at the NAT64 within 50
> to 100 milliseconds. Further assuming that fragmented traffic makes up
> less than 10% of all traffic, this only requires a buffer of 6 to
> 12,500 fragments (50 ms at 10 Mbps to 100 ms at 10 Gbps).
>
> In some cases, especially in the IPv6-to-IPv4 direction, there may
> only be a single session matching the fragment's source and
> destination addresses and protocol number. In these cases, it would be
> possible to translate the fragments out-of-order. A NAT64 translator
> MAY do this for TCP, however, it MUST NOT translate UDP packets before
> the first fragment is available. The reason for this is that the
> fragment could be part of a packet setting up a new session. However,
> with TCP session establishment packets don't carry data, so it's
> extremely unlikely that they are fragmented. This is not the case with
> UDP, and in the IPv4-to-IPv6 direction, a UDP packet may have a zero
> checksum, which must be recalculated when translating to IPv6, for
> which the entire packet must be available.
>
> IPv6-to-IPv4
>
> For all IPv4 packets that the NAT64 creates through translation, the
> translator generates an ID value. This applies to all packets,
> regardless of their size or the value of the DF field. A NAT64
> translator MAY employ strategies to avoid reusing an ID value for a
> certain source, destination, protocol tuple as long as possible. If
> the IPv4 packets are fragments of an IPv6 packet, then state is
> created that makes it possible for all the fragments to have the same
> ID value on the IPv4 side.
>
> [RFC 2765] specifies copying the lower bits from the IPv6 ID field in
> a fragment header (if present) to the IPv4 ID field, but this runs the
> risk of two IPv6 hosts talking to the same IPv4 destination through
> the NAT64 using the same ID value.
>
> Otherwise, when translating IPv6 packets with a fragmentation header,
> the fragments are translated as per [RFC 2765].
>
> IPv4-to-IPv6
>
> Because packets coming in on the IPv4 side may be larger than 1280
> bytes after translation, a NAT64 MUST implement PMTUD on the IPv6
> side. In other words, it must react to "packet too big" messages for
> any IPv6 destination that it communicates with by limiting the size of
> the packets that it sends to the advertised maximum.
>
> In the case where, after translation from IPv4 to IPv6, a packet is
> larger than a destination's PMTU, the NAT64 returns a "packet too big"
> as outlined earlier in the case that the DF bit was set to 1 in the
> IPv4 packet. If the DF bit was set to 0, the translator first
> translates the IPv4 packet, and then fragments the resulting IPv6
> packets using normal IPv6 fragmentation rules. The value in the ID
> field is generated locally by the NAT64. If the IPv4 packet was a
> fragment, state is created that allows the same ID value to be used
> for all IPv6 packets or fragments that are part of the same original
> IPv4 packet.
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


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From alain_durand@cable.comcast.com  Tue Apr 14 07:29:51 2009
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Date: Tue, 14 Apr 2009 10:29:20 -0400
From: "Durand, Alain" 
To: Lars Eggert , Iljitsch van Beijnum 
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Thread-Topic: [BEHAVE] NAT64 fragmentation
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Cc: tcpm-chairs@tools.ietf.org, Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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The question of fragmentation/MTU adaptation & TCP MSS came also in Softwire
for Dual-stack lite.

See:
http://www.ietf.org/mail-archive/web/softwires/current/msg00793.html
As a response to:
http://www.ietf.org/mail-archive/web/softwires/current/msg00790.html

  - Alain.


On 4/14/09 10:16 AM, "Lars Eggert"  wrote:

> Hi,
> 
> please run your proposal on TCP MSS clamping by the TCPM WG. I'm not
> aware of any existing RFC that describes/recommends this technique
> (although it's obviously implemented in some products), and we need to
> carefully discuss what we want to say here.
> 
> Lars
> 
> On 2009-4-13, at 18:12, Iljitsch van Beijnum wrote:
> 
>> Hi all,
>> 
>> here is text about fragmentation that I've been working on for the
>> NAT64 draft.
>> 
>> Comments are appreciated, especially about the choice for DF=0 <= 1280
>> and DF=1 > 1280 byte packet sizes for IPv6->IPv4.
>> 
>> Iljitsch
>> 
>> 
>> 
>> Packet sizes
>> 
>> It's the job of the network layer to adapt to different maximum packet
>> sizes as packets move through the network. There are three mechanisms
>> that handle this: transport layer negotiations such as the TCP MSS
>> option, path MTU discovery and fragmentation. The difference between
>> the IPv4 and IPv6 header sizes requires some handling in a NAT64
>> translator, and there are complications because of the differences
>> between how IPv4 and IPv6 handle fragmentation, as well as the issue
>> of how to demultiplex fragmented IPv4 packets.
>> 
>> There are two approaches to path MTU discovery and fragmentation when
>> translating from IPv6 to IPv4:
>> 
>> 1. Set DF to 0 in the translated packets. This avoids path MTU
>> discovery issues but leads to significant numbers of fragments.
>> 
>> 2. Set DF to 1 in the translated packets. This supports path MTU
>> discovery on the IPv4 side so unnecessary fragments are avoided, but
>> it doesn't address the issue that IPv6 hosts are not required to
>> perform PMTUD when sending packets of 1280 bytes or smaller.
>> 
>> The choice made in this document is to support option 1 for packets
>> upto 1280 bytes, and option 2 for packets larger than 1280 bytes.
>> 
>> A NAT64 translator MUST have an MTU of at least 1280 on all of its
>> interfaces, both IPv4 and IPv6 interfaces.
>> 
>> TCP MSS option
>> 
>> The TCP MSS option [RFC 793] is used during the three-way handshake by
>> the two hosts involved to inform each other about the maximum TCP
>> segment size (assuming IP and TCP headers without options) that the
>> host can receive.
>> 
>> In practice, the MSS option is often used to make TCP work in the
>> presence of broken path MTU discovery.
>> 
>> To avoid unnecessary path MTU discovery cycles, a NAT64 SHOULD rewrite
>> the MSS option in SYN packets to the minimum of the original MSS
>> option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU on
>> the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6
>> direction and the IPv6-to-IPv4 direction.
>> 
>> Path MTU discovery
>> 
>> The vast majority of both IPv4 and IPv6 hosts use path MTU discovery
>> [RFC 1191] [RFC 1981]. With IPv4, PMTUD can be enabled on a per-packet
>> basis by setting the DF bit to 1. With IPv6, there is no need for
>> PMTUD for packets up to 1280 bytes because all IPv6 hosts are required
>> to be able to receive 1280-byte packets without fragmentation. When
>> sending larger packets, IPv6 hosts implicitly use PMTUD.
>> 
>> IPv6-to-IPv4
>> 
>> If the NAT64 has the same MTUs on its IPv6 and IPv4 interfaces, it
>> will never have to generate "packet too big" messages for incoming
>> IPv6 packets because the translation from IPv6 to IPv4 reduces the
>> packet size by 20 bytes, more if the IPv6 packet has extension headers
>> that are removed during the translation, such as the fragment header.
>> If the MTU on the IPv6 side is larger than 1280 bytes and more than 20
>> bytes smaller than the MTU on the IPv4 side, the NAT64 MUST generate
>> the appropriate "packet too big" messages on the IPv6 side.
>> 
>> To support PMTUD, for translated packets that are larger than 1260
>> bytes on the IPv4 side (1280 bytes IPv6 packets with 20 byte size
>> reduction through the translation), the DF bit is set to 1 in the
>> resulting IPv4 packet.
>> 
>> IPv4 routers may generate "packet too big" messages indicating a
>> supported MTU size smaller than 1280 bytes. In those cases, the IPv6
>> hosts will continue to send packets larger than what the IPv4 path MTU
>> can support. To allow packets to be delivered successfully in this
>> case, the DF bit is set to 0 in all translated packets smaller than or
>> equal to 1260 bytes, to allow these packets to be fragmented in the
>> IPv4 network.
>> 
>> Note: it is highly recommended for IPv4 hosts running services that
>> may be used by IPv6 clients through a NAT64 translator to use an MTU
>> size of at least 1260 bytes and to properly generate "packet too big"
>> messages.
>> 
>> When a NAT64 translates "packet too big" messages from IPv6 to IPv4,
>> it adjusts the advertised MTU to the minimum of the original
>> advertised MTU + 20, the NAT64's MTU on the IPv6 side + 20 and the
>> NAT64's MTU on the IPv4 side.
>> 
>> IPv4-to-IPv6
>> 
>> Because it may be necessary to include a fragmentation header or other
>> extension header, the NAT64 MUST be prepared to generate "packet too
>> big" messages for packets with the DF bit set to 1 received from the
>> IPv4 side, regardless of the MTU sizes on the IPv4 and IPv6
>> interfaces. If the packet is larger than can be transmitted on the
>> IPv6 side after translation, the NAT64 returns a "packet too big"
>> message indicating the maximum IPv4 packet size that would be
>> supported using the same translation as the current packet. This can
>> be calculated as IPv4-packet-size - (IPv6-packet-size - IPv6-total-
>> length) + 20.
>> 
>> When a NAT64 translates "packet too big" messages from IPv4 to IPv6,
>> it adjusts the advertised MTU to the minimum of the original
>> advertised MTU - 20, the NAT64's MTU on the IPv6 side and the NAT64's
>> MTU on the IPv4 side - 20. However, if the advertised MTU in "packet
>> too big" messages is smaller than 1260 bytes, the value put into the
>> translated "packet too big" message is 1280. This makes sure that the
>> IPv6 host will limit its packet sizes to 1280 bytes, so its packets
>> are subsequently translated into IPv4 packets with DF set to 0. (This
>> deviates from [RFC 2765].)
>> 
>> Fragmentation
>> 
>> Because NAT deviates from normal router behavior, the limitation that
>> IPv6 packets or IPv4 packets with DF set to 1 are not fragmented by
>> routers doesn't apply to a NAT64 translator. Where appropriate, these
>> packets are fragmented after translation as described below.
>> 
>> Demultiplexing
>> 
>> Because NAT64 provides a stateful many-to-one (perhaps even many-to-
>> many) translation, it is necessary to recognize which session a given
>> packet belongs to. For this, the TCP or UDP port numbers must be
>> known, but these only occur in the first fragment of a fragmented
>> packet. There are two possible ways to deal with this:
>> 
>> 1. Reassemble the packet before translating it.
>> 
>> 2. Create translation state for the fragments belonging to the same
>> packet so each packet can be translated.
>> 
>> Strategy 2 is attractive in large installations because it requires
>> less storage and processing. However, it may still be necessary to
>> buffer fragments for some time, as the fragment containing the first
>> part of the packet (and with that, the port numbers) may not be the
>> first one to arrive.
>> 
>> Note: based on the assumptions that hosts generate fragments in-order
>> and that reordering must happen through parallel network links and
>> that the path between these parallel links and a NAT64 supports speeds
>> of at least 10 Mbps, there is a very high probability that two out-of-
>> order fragments making up a packet will arrive at the NAT64 within 50
>> to 100 milliseconds. Further assuming that fragmented traffic makes up
>> less than 10% of all traffic, this only requires a buffer of 6 to
>> 12,500 fragments (50 ms at 10 Mbps to 100 ms at 10 Gbps).
>> 
>> In some cases, especially in the IPv6-to-IPv4 direction, there may
>> only be a single session matching the fragment's source and
>> destination addresses and protocol number. In these cases, it would be
>> possible to translate the fragments out-of-order. A NAT64 translator
>> MAY do this for TCP, however, it MUST NOT translate UDP packets before
>> the first fragment is available. The reason for this is that the
>> fragment could be part of a packet setting up a new session. However,
>> with TCP session establishment packets don't carry data, so it's
>> extremely unlikely that they are fragmented. This is not the case with
>> UDP, and in the IPv4-to-IPv6 direction, a UDP packet may have a zero
>> checksum, which must be recalculated when translating to IPv6, for
>> which the entire packet must be available.
>> 
>> IPv6-to-IPv4
>> 
>> For all IPv4 packets that the NAT64 creates through translation, the
>> translator generates an ID value. This applies to all packets,
>> regardless of their size or the value of the DF field. A NAT64
>> translator MAY employ strategies to avoid reusing an ID value for a
>> certain source, destination, protocol tuple as long as possible. If
>> the IPv4 packets are fragments of an IPv6 packet, then state is
>> created that makes it possible for all the fragments to have the same
>> ID value on the IPv4 side.
>> 
>> [RFC 2765] specifies copying the lower bits from the IPv6 ID field in
>> a fragment header (if present) to the IPv4 ID field, but this runs the
>> risk of two IPv6 hosts talking to the same IPv4 destination through
>> the NAT64 using the same ID value.
>> 
>> Otherwise, when translating IPv6 packets with a fragmentation header,
>> the fragments are translated as per [RFC 2765].
>> 
>> IPv4-to-IPv6
>> 
>> Because packets coming in on the IPv4 side may be larger than 1280
>> bytes after translation, a NAT64 MUST implement PMTUD on the IPv6
>> side. In other words, it must react to "packet too big" messages for
>> any IPv6 destination that it communicates with by limiting the size of
>> the packets that it sends to the advertised maximum.
>> 
>> In the case where, after translation from IPv4 to IPv6, a packet is
>> larger than a destination's PMTU, the NAT64 returns a "packet too big"
>> as outlined earlier in the case that the DF bit was set to 1 in the
>> IPv4 packet. If the DF bit was set to 0, the translator first
>> translates the IPv4 packet, and then fragments the resulting IPv6
>> packets using normal IPv6 fragmentation rules. The value in the ID
>> field is generated locally by the NAT64. If the IPv4 packet was a
>> fragment, state is created that allows the same ID value to be used
>> for all IPv6 packets or fragments that are part of the same original
>> IPv4 packet.
>> 
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
> 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From marcelo@it.uc3m.es  Tue Apr 14 09:02:58 2009
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From: marcelo bagnulo braun 
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Subject: [BEHAVE] trade-offs handling multiple state-full v4v6 translators
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Warning: long email coming

The goal of this email is to get input from the WG on how to support 
multiple v4v6 translators.

We have different level of support of multiple state-full translators 
within a domain and we need to agree on a trade-off in this situation.


The scenario is the following:


+------------------------+
|  v6 site               |
|                        |
|            |   +------+|  +---+
|            |---|NAT64a|---| V4|
|            |   +------+|  | In|
|   +-----+  |           |  |ter|     +------+
|   |H1 v6|--|           |  |net|-----|H2 v4 |
|   +-----+  |   +------+|  |   |     +------+
|            |---|NAT64b|---|   |
|            |   +------+|  |   |
|            |           |  +---+
|                        |
+------------------------+

So, The first question is what do we want to achieve when we have 
multiple translators. There are two obvious goals: load sharing and 
fault tolerance.

Because the different NAT64 boxes are likely to have different pool of 
public IPv4 addresses, then, it seems challenging to preserve 
established communications through the failure of a NAT64 box.

So, preserving established connections through failure of one NAT64 box 
is not a goal for NAT64. Makes sense?

What can be achieved is to allow new communications to be established 
when one of the NAT64 boxes have failed, using the alternative one if it 
is up. So, if we accept the proposed scoping of the goal, fault 
tolerance in this context means exactly that.

--------------------------------------------------------------

So as a first question: Do people agree that the goals for the case of 
multiple translators should be load sharing and fault tolerance (using 
the previous definition of fault tolerance)?

---------------------------------------------------------------

If yes, a key issue to consider is how the Prefix64 is used 
(irrespectively whether the Prefix64 is a WK prefix or a LIR prefix, i 
think this analysis is orthogonal to that decision and applies to both 
of them)

So, a bit of context, cause the discussion is a bit hairy

A NAT64 box needs to be configured with a Prefix64 in order to represent 
IPv4 address in the IPv6 address space. This is usually done by 
concatenating the PRefix64 and the IPv4 address and potentially a suffix.

In addition, the NAT64 needs to inject a route towards the Prefix64 in 
the IPv6 domain so that it sinks all the packets containing that 
destination prefix, so it can translate them into IPv4 packets.

In a setting  with a single NAT64 box, the Prefix64 used to create  IPv6 
representations of IPv4 address and the prefix included in the route 
injected by the NAT64 box are the same, so life is easy. This is not 
necessarily the case in the case with multiple NAT64 boxes, especially, 
if we want to provide the aforementioned features.

-------------- Option 1 --------------------------------------------------

So, one obvious choice is that we assign the same Prefix64 to both NAT64 
boxes and that both NAT64 boxes inject a route towards that prefix in 
the IPv6 routing domain.

The result is that we do have some load sharing, cause IPv6 hosts will 
use the NAT64 box that is closer (according to the IGP) and in case of a 
failure of one of the boxes, new communications will be routed to the 
alternative NAT64 box, since we assume that the route to the former 
NAT64 box disappear when the NAT64 box went down. The limitation of this 
approach is that it may be possible, due to intra site routing 
fluctuations, that packets of a given communication that were originally 
using a NAT64 box end up using a different NAT64 box and the 
communication is interrupted.

Consider the following example:


+-----+    |    +--+          +------+
|Host1|----|----|R1|----+-----|NAT64a|
|IPv6 |    |    +--+    |     +------+
+-----+    |          +---+   
           |          |R2 |  
           |    +--+  +---+   +------+
           |----|R3|    |     |NAT64b|
           |    |  |  +--+    |      |
           |    |  |--|R4|----|      |
                +--+  +--+    +------+


Both NAT64a and NAT64b are injecting a route for the Prefix64 into the IGP
suppose both NAT64 are working.
Host1 initiates a communication, so it will use NAT64a, since it is the 
one with shortest distance from Host1
Suppose that at some point R1 fails. At this point, packets from Host1 
will be delivered to NAT64b, which will translate them using a different 
public IPv4 address and the communication will fail. Please note that 
both NAT64 boxes are working fine, it is just a change in the intra 
domain routing that made the connection to be interrupted.

So, is this acceptable? If not, we can explore other options.

-------------- Option 2 --------------------------------------------------

One possible way to address this problem is for the different NAT64 
boxes to announce a more specific prefix and the less specific prefix. 
Let me expand on this. Suppose (as an example) that the Prefix64 is 48 
bot long. The IPv6 representation of IPv4 address a.b.c.d would then be 
Prefix64:a.b.c.d::. Suppose now that NAT64a injects two routes into the 
IGP one for Prefix64::/49 and another one for PRefix64::/48, while 
NAT64b injects Prefix64:FFFF::/49 and Prefix64::/48.
This setup implies that all packets with IPv4 destination address within 
the prefix 0.0.0.0/1 will be routed to NAT64a and all packets with IPv4 
destination within the prefix 128.0.0.0/1 will be routed to NAT64b (as 
long as both NAT64 boxes are up). In case one of them fail, all packets 
will be routed to the remaining one, thanks to the less specific route. 
This provides the fault tolerance capabilities and also deals with the 
routing fluctuation problem. However, this option is not without 
limitations of its own.

A first limitation is that the resulting load sharing capabilities are 
far from optimal. IPv4 addresses usage is not uniformly distributed 
accross the IPv4 address space, so it is likely that one of the NAT64 
boxes will get more load than the other one with this simple approach 
(this needs to be confirmed, but it seems this can be the case).

A second, probably much more serious limitation, is that this seems to 
break current nat traversal techniques (since it would break endpoint 
independent behaviour)(*). The problem is that when an IPv6 host behind 
two NAT64 boxes announcing different prefixes try to communicate with 
different IPv4 target hosts, the packets can be routed through different 
NAT64 boxes, so the same host will appear to the IPv4 hosts with 
different IPv4 addresses. For example, suppose that in the setup 
previously described an IPv6 hosts sends a packet towards host 1.1.1.1. 
This packet will be processed by NAT64a and will be sent with an IPv4 
source address from the pool of NAT64a. Next the _same_ host sends a 
packet to 130.1.1.1 and the packet is then processed by NAT64b, so, the 
resutling IPv4 packet will include an address from the NAT64b pool as a 
source address. I understand that this is exactly the behaviour that not 
desired and that NAT traversal techniques would not work if this case. 
Is this correct? Is this acceptable?

If not acceptable, we can explore other alternatives.

-------------- Option 3 --------------------------------------------------

A simple alternative option would be for the NAT64 boxes to use a 
different Prefix64. In this case, NAT64a would use Prefix64a and NAT64b 
would use Prefix64b. NAT64a will inject Prefix64a in the routing system 
and NAT64b will inject PRefix64b in the IGP. Let's assume there is no 
relationship whatsoever between the two prefixes for now.

With this approach, we can solve the previous problem, since packets 
containing  destination address with PRefix64a will always be routed 
towards NAT64a as long as the NAT64a box is reachable. Same for NAT64b. 
The problem though is that if one of the boxes fail, packets containing 
a destination address with one of the prefixes will never be delivered 
to the alternative box, beating the fault tolerance purpose.

We consider next some approaches to overcome this limitation.

-------------- Option 4 --------------------------------------------------

One option is to involve the DNS64 at this point. So, if we have two 
Prefix64, the DNS64 can synthesize using any of them.
In order to provide fault tolerance, the DNS64 could actually return two 
synthetic AAAA RR, one with each prefix. In this way, if a NAT64 box is 
down, the initiating host will try with the alternative AAAA RR and will 
use the alternative prefix, hence the alternative NAT64 box. In this 
case, the fault recovery is up to the host. Is this acceptable? (note 
that in this case, each NAT64 box is only announcing a single route with 
its own prefix, so from the NAT64 perspective as well as from the IGP 
perspective, this approach is straightforward)

In order to achieve load balancing properties, the DNS64 should use them 
in a round robin fashion i.e. return a different prefix64 in the first 
AAAA RR included in the answer. The problem here is similar to a 
previous case (*) is that this has the potential to break endpoint 
independent behaviour, since the same host can obtain answers with 
different prefixes and be exposed to the IPv4 hosts with different IPv4 
address, potentially breaking NAT traversal techniques. Is this correct?
It would be possible to overcome this limitation if we always present 
the same prefix in the first AAAA RR contained in the DNS response. This 
basically requires that the DNS64 uses first one prefix or the other 
depending on the source address of the DNS query (please note that this 
does not require a per host state in the DNS64)
This approach seems to work at this point, is this acceptable?

-------------- Option 5 --------------------------------------------------

Finally, another way of dealing with multiple prefixes is for the NAT64 
boxes to be aware of the multiple prefixes.
In this case, both NAT64 boxes announce both prefixes but with different 
distance. So NAT64a announces a route in the IGP to Prefix64a with a 
short distance and also announces a route towards Prefix64b but with a 
high distance. NAT64b does the opposite i.e. announce the two routes 
with the distances interchanged.
DNS64 will behave in the same way as in the previous case. The 
difference, is that both NAT64 boxes can support both prefixes, so in 
case one NAT64 box fails, there is no need for the host to retry with 
the alternative prefix, since the remaining NAT64 box can handle both 
prefixes.
The downside with this is that the NAT64 needs to keep track of which 
IPv6 source address is using which Prefix64, so it requires more state 
in the NAT64 and its processing becomes more complex (and what's more it 
make the state machine more complex, needing to handle different states 
based on the incoming source address and prefix combinations)


----------------------------------------------------------------


My personal preference is Option 4, but if people can comment it would 
be very useful.


Regards, marcelo

From iljitsch@muada.com  Tue Apr 14 11:50:31 2009
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From: Iljitsch van Beijnum 
To: "Durand, Alain" 
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Cc: tcpm-chairs@tools.ietf.org, Behave WG , Joe Touch 
Subject: Re: [BEHAVE] NAT64 fragmentation
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[Added even more CCs, please prune where appropriate]

On 14 apr 2009, at 16:29, Durand, Alain wrote:

> The question of fragmentation/MTU adaptation & TCP MSS came also in  
> Softwire
> for Dual-stack lite.

> See:
> http://www.ietf.org/mail-archive/web/softwires/current/msg00793.html
> As a response to:
> http://www.ietf.org/mail-archive/web/softwires/current/msg00790.html

I don't think TCP authentication issues apply because the translation  
breaks those anyway.

From dthaler@windows.microsoft.com  Tue Apr 14 13:19:53 2009
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From: Dave Thaler 
To: Fred Baker , Xing Li , congxiao 
Date: Tue, 14 Apr 2009 13:21:00 -0700
Thread-Topic: Comments on draft-baker-behave-v4v6-framework-02
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I was out on jury duty last week so am still trying to catch up on email,
but I did have a chance to review the framework document and type up
my comments.  There's a lot of them so they're inline in the attached
PDF.

In addition, I have a couple of general comments:

The definition of "IPv{4,6}-only" talks about "two application
instances are capable of communicating using IPv{4,6}...", and
the title of the document is Framework for IPv4/IPv6 Translation.
This is all well and good, except that in reading it this time I realized
the document today doesn't actually cover all of that.  Specifically
what is missing is cases where there's an IPv{4,6}-only application
running on a dual-stack (i.e. completely provisioned) host.  Section 1.5
talks about connecting IPv{4,6} "networks".  This is sufficient only
so long as you could define a single application instance as a "network"
which seems a bit unintuitive.

In my view, the framework really should be an overall framework for
talking about the problems.  Doing translation in a host, for example,
should be within the scope of the framework.

Some relevant RFCs (not saying these *solutions* need to be explained
in the framework but they address scenarios, where the *scenario(s)*
should be covered in the framework) are:
 * RFC 2767 (Bump in the Stack)
 * RFC 3338 (Bump in the API)
 * RFC 3493's use of V4MAPPED addresses
 * RFC 3142 (a TCP/UDP relay)

For example, if you have an IPv4-application listening for incoming
connections, on a node that has both IPv4 and IPv6 provisioned,
and IPv4 and IPv6 addresses in DNS, then how can a client in an
IPv6-only network talk to it?  (There could be a translator in
the dual stack host, or a TDP/UDP relay, or the DNS ALG might
synthesize AAAA records even though there's a real AAAA record
- I brought this to the attention of the DNS64 draft authors in
separate email.)  Currently this scenario isn't even mentioned,
but should be, in my view.

-Dave

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--_002_E9CACA3D8417CE409FE3669AAE1E5A4F11EAF1C7AANAEXMSGW601wi_--

From rjsparks@nostrum.com  Tue Apr 14 13:49:16 2009
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From: Robert Sparks 
To: Philip Matthews 
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Cc: Behave WG , iesg@ietf.org, Behave Chairs 
Subject: Re: [BEHAVE] TURN-14 published
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I've cleared. I added a note with my remaining worry (copied below),  
but I don't insist the document address it.
----
(Comment to version -14): I think it's likely that a client  
implementer will miss noticing that the client needs to set a separate  
timer for refreshing the permission and the channelbind when a  
channelbind request succeeds. You could help avoid some interop  
problems by explicitly calling this out in the "processing channelbind  
responses" section.
----
RjS

On Apr 12, 2009, at 3:27 PM, Philip Matthews wrote:

> I have just submitted version -14 of TURN (draft-ietf-behave-turn).  
> This version attempts to address all but one of the COMMENTs and  
> DISCUSSes raised during the IESG evaluation of TURN. The only one  
> not addressed is the DISCUSS suggesting that security be mandatory  
> for servers -- this topic is currently being discussed on a separate  
> thread on the mailing list.
>
> I would like to call the WG's attention to the following two  
> technical changes made in this version:
>
>   o  Reworded the text in Section 6.2 and Section 7.2 to more clearly
>      describe how the allocation lifetime is computed in the case  
> where
>      a client requests a lifetime that is greater than both the  
> default
>      lifetime and the server's maximum allowed lifetime.
>
>   o  In Section 6.2, swapped the steps that check the RESERVATION- 
> TOKEN
>      and EVEN-PORT attributes to correctly handle the case where an
>      Allocate request contains both attributes.  The new text  
> correctly
>      returns 400 Bad Request in this case.
>
> These two changes were made to fix two bugs in the spec found by  
> Robert Sparks. Please review to make sure no new bugs were introduced.
>
> I would also like to call the WG's attention to a significant  
> rewrite in the Overview section:
>
>   o  The former "Other Features" section of the Overview has been
>      replaced with a series of sections describing various secondary
>      features of TURN, and the text describing and motivating these
>      secondary features has been expanded.  As a part of this rewrite,
>      there is now a section that describes how to avoid IP
>      fragmentation when using TURN.
>
> The main goal of this rewrite was to address a comment by Lars  
> Eggert about avoiding IP fragmentation, but I ended up making some  
> changes to the surrounding text to motive other minor features.
>
> Other changes introduced in this version:
>
>   o  In Section 8, changed the term "default permission lifetime" to
>      "Permission Lifetime" to make it clearer that the lifetime of a
>      permission is not configurable.
>
>   o  Added text in the Overview section to describe why various timer
>      values were chosen.
>
>   o  Added a sentence to the IAB consideration section saying that the
>      disappearance of NATs in the near-term seems unlikely.
>
>   o  The former "Other Features" section of the Overview has been
>      replaced with a series of sections describing various secondary
>      features of TURN, and the text describing and motivating these
>      secondary features has been expanded.  As a part of this rewrite,
>      there is now a section that describes how to avoid IP
>      fragmentation when using TURN.
>
>   o  Added some additional text in the Overview to explain how a  
> client
>      would select between UDP, TCP, and TLS transport.
>
>   o  Fixed various minor typos.
>
> Comments on this new version are welcome.
>
> - Philip
>


From philip_matthews@magma.ca  Tue Apr 14 14:00:59 2009
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Subject: [BEHAVE] Should NATs pass ICMP Extensions transparently?
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In between working on TURN, I have been looking at the details of  
NAT64 support for ICMP. One of the questions that has come up is:

	What should a NAT64 (or NAT44 or NAT66...) do with ICMP extensions?


The Background
==============
The syntax for ICMP extensions is defined in RFC 4884. An ICMP  
extension (or more properly, an ICMP Extension Object) is extra  
information that that can be added to certain ICMPv4 or -v6 messages:  
the Destination Unreachable, Time Exceeded, Parameter Problem, or  
Packet Too Big messages. With extension(s), one of these messages  
looks as follows:

                   +-----------------------+
                   |                       |
                   |      IP header        |
                   |                       |
                   +-----------------------+
                   |     ICMP header       |
                   |  (e.g Dest Unreach)   |
                   +-----------------------+
                   |                       |
                   |   First N bytes of    |
                   |   the IP datagram     |
                   |   that caused the     |
                   |   problem             |
                   |                       |
                   +-----------------------+
                   | ICMP Extension header |
                   +-----------------------+
                   |  Extension Object 1   |
                   +-----------------------+
                   |          ...          |
                   +-----------------------+
                   |  Extension Object M   |
                   +-----------------------+

RFC 4884 just defines the basic syntax;  individual Extension Objects  
are to be defined in separate documents.

Each Extension Object has a TLV-like structure with a type (called  
"Class-Num") and a sub-type (called "C-Type").

At present, only one Extension Object has been officially defined: the  
MPLS Label Stack Object. This Object contains the MPLS label stack  
that was on the IP message that cause the problem. One of the big uses  
of this object today is to provide a version of Traceroute that  
understands MPLS.


The Question
============
How should NATs treat ICMP Extension Objects?

BEHAVE-ICMP (just published a few days ago as RFC 5508) says "NATs are  
encouraged to support ICMP extension objects" (section 4.2.1)).  
However, it does not specify exactly what "support" means, except to  
say that the basic extension structure must be recognized and  
translated properly.

I see at least two options:

1) NATs are aware of some individual Objects and translate them as  
necessary. Objects unknown to the NAT are stripped out.

2) NATs treat Objects as opaque and pass them through transparently.  
Objects MUST be defined to be independent of Address Realm.


The Proposal
============
I propose we adopt option (2):  NATs pass individual objects through  
transparently.

I feel that we want NATs to be as transparent as possible. Option (2)  
means that new Objects can be defined and deployed without requiring  
existing NATs to be upgraded.

The MPLS Label Stack Object does not contain addresses, so it can be  
passed transparently.


The Complication
================
There is an individual draft (draft-atlas-icmp-unnumbered) which  
proposes an Interface Information object that, as currently defined,  
cannot pass through a NAT64 transparently. [The problem is that the  
syntax of this object, as currently defined, assumes that the  
addresses inside the Object are of the same family as the outer IP  
header].

This draft is currently in IESG evaluation.

If this draft is published without fixing this issue, then I propose  
that we make an exception for this Object only:    For this Object, a  
NAT MUST either drop or translate the Object.


The Summary
===========
I think NATs SHOULD pass ICMP Extension Objects transparently, with  
the possible exception of the (almost finalized) Interface Information  
Object.


Comments?

- Philip


From bbl@lowekamp.net  Tue Apr 14 19:37:06 2009
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From: Bruce Lowekamp 
To: Cullen Jennings 
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NATBehavior Discovery Using STUN) to Experimental RFC
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On Wed, Apr 8, 2009 at 8:49 PM, Cullen Jennings  wrote:
>
> On Apr 5, 2009, at 8:57 PM, Bruce Lowekamp wrote:
>
>> Bernard,
>>
>> Thanks for the comments. =C2=A0Let me see if I can describe a scenario i=
n
>> which behavior-discovery is useful.
>>
>> First, we don't want to "go back to 3489." =C2=A0There were two problems
>> (well, there were a lot more problems, but I just want to talk about
>> two right now) in particular that we don't ever want to go back to:
>>
>> - 3489 specified that an application would start up, characterize its
>> NAT, and work in that mode forever after
>> - 3489 specified that if you had a friendly NAT, you could query the
>> STUN server for your transport address and use that one address
>>
>> At the same time, behavior-discovery is targeting applications for
>> which ICE doesn't necessarily make sense. =C2=A0For example, application=
s
>> that don't want to fall back to TURN, but have other options for how
>> to establish a connection. =C2=A0 (whether this means indirect routing o=
r
>> not needing the connection, or other reasons)
>>
>> So let me try to go into more details on a potential P2P application.
>> When P2P node A starts up, it evaluates its NAT(s) relative to other
>> nodes already in the overlay. =C2=A0Let's say that its testing indicates
>> it's behind a good NAT, with endpoint-independent mapping and
>> filtering.
>
> This is the where this whole line of thinking goes off the rails. How wou=
ld
> we run a test that would indicate the above?


I've been thinking about whether there is any more accurate way to
describe what the tests indicate.  4.3 currently uses the phrase "the
NAT currently has Endpoint-Independent Mapping".  It might be slightly
more accurate to say that "the test produces no evidence to indicate
that the NAT is not currently using Endpoint-Independent Mapping."  Of
course, given all of the requests to shorten the text, that's a lot of
verbage to update all relevant statements.  It's also going to be very
hard to read.  I can add another explanation to the beginning of
Section 4, though.

> Many of the NATs out there you
> can not make this determination without multiple IP addresses behind the
> NAT.

So you're right that you can test for a few more bizarre NAT behaviors
with multiple IP addresses, but I haven't seen any evidence suggesting
those behaviors are present in most NATs.  Obviously these tests (that
require multiple private IP addresses) can't be run by most
applications.  I also think this is a good example of tests that can
be run using the Attributes defined in behavior-discovery, but which
really don't need to be described in the draft.  Can you provide what
you would think would be an appropriate reference?  I'll add a
statement that for more accurate characterization of NAT behavior,
these tests must be run using multiple private IP addresses.

Regardless of those tests, this is playing with the law of diminishing
returns.  Since NATs can change behavior over time and under load,
focusing too much effort on characterizing a single instant in time
isn't going to be nearly as useful as monitoring the NATs behavior
under usage.

> I have raised this objection at the microphone multiple times in the WG
> and it is always meant with roughly the same answer that is here "ah, the=
re
> are some details that are in the draft but we can explain how to do it in
> the next version of the draft".

Please cite any time when you have raised this objection at the mic in
the minutes or audio recordings.  I have no recollection of you doing
this, and do not see it in the minutes.  Henry did mention it in a
comment at the mic once, which I did not respond to clearly, but I
don't believe you have ever brought this up at the mic.

The topic has been discussed offline, though, and I believe it is in
the same category of the discussions about testing for linux NATs and
for other bizarre behaviors that have been seen.  The draft tries to
discuss the most straightforward tests, in particular for describing
behaviors according to rfc4787.  It can't describe every test possible
with the attributes, nor should it.  But providing pointers to and
encouraging readers to investigate other applications of the
attributes seems like a good idea.

> The draft is now in IETF LC and we have not
> seen details on how to do this that work even in an opportunistic way. Th=
e
> WG has not even had a chance to comment on if the believe these details
> would work or not.

I don't know what you're referring to here.  For some reason your
reply didn't go to the behave WG list, so I restored that to the CC
list.  This draft has been discussed in detail at 3 separate sessions,
briefly at several others, and multiple times on the mailing list.  If
you think there is a topic that has not been adequately discussed on
the mailing list, by all means bring it up.  I welcome any WG comments
on this topic.

Bruce

>
> Cullen 
>
>

From brian.e.carpenter@gmail.com  Tue Apr 14 20:01:40 2009
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Cc: Behave WG , Xing Li , Fred Baker , Hiroshi MIYATA , Behave Chairs 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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On 2009-04-13 21:44, marcelo bagnulo braun wrote:
> Brian E Carpenter escribi=C3=B3:
>>
>>
>> And the same practice would need to be used for the WKP: more specific=
s
>> not allowed. BTW that might recreate some of the black hole issues
>> we see for 6to4.=20
>=20
> could you expand on how this would be?

At least two bad things happen with 6to4 if the WKP is incorrectly
advertised or filtered.

1. 2002::/16 is advertised too far - that is to say, A advertises it to B=
,
but the relay that A is operating has an ACL that drops IPv6 packets from=

outside A. Users sending native IPv6 packets to a 6to4 destination via B
will be sending them into a black hole. In this case, A was wrong to
export the prefix.

2. 2002::/16 is advertised too short - that is to say, A advertises it to=
 B,
*and* is willing to relay IPv6 packets from B, but B drops the route. Use=
rs
sending native IPv6 packets to a 6to4 destination via B will get Destinat=
ion
Unreachable. In this case, B was wrong to filter the prefix.

Actually, the correct solution is that every ISP offering native IPv6 ser=
vice
MUST either operate an inbound (to 6to4) relay or support a 2002::/16 rou=
te
to such a relay, and MUST NOT advertise such a route to other ISPs unless=

it is willing to accept all traffic.

I'm sure similar problems would arise with a NAT64 WKP, if used carelessl=
y.
But I think Xing Li's analysis a few days ago was correct.

   Brian


From brian.e.carpenter@gmail.com  Tue Apr 14 20:12:07 2009
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Date: Wed, 15 Apr 2009 15:13:18 +1200
From: Brian E Carpenter 
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Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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Dave,

On 2009-04-15 08:21, Dave Thaler wrote:
> I was out on jury duty last week so am still trying to catch up on email,
> but I did have a chance to review the framework document and type up
> my comments.  There's a lot of them so they're inline in the attached
> PDF.
> 
> In addition, I have a couple of general comments:
> 
> The definition of "IPv{4,6}-only" talks about "two application
> instances are capable of communicating using IPv{4,6}...", and
> the title of the document is Framework for IPv4/IPv6 Translation.
> This is all well and good, except that in reading it this time I realized
> the document today doesn't actually cover all of that.  Specifically
> what is missing is cases where there's an IPv{4,6}-only application
> running on a dual-stack (i.e. completely provisioned) host.  Section 1.5
> talks about connecting IPv{4,6} "networks".  This is sufficient only
> so long as you could define a single application instance as a "network"
> which seems a bit unintuitive.
> 
> In my view, the framework really should be an overall framework for
> talking about the problems.  Doing translation in a host, for example,
> should be within the scope of the framework.

I understood that the AD's guidance was to limit the scenarios
to the separate-translator-box cases that the draft covers. Won't we
complicate the discussion enormously by expanding the scope as you
describe?

    Brian
> 
> Some relevant RFCs (not saying these *solutions* need to be explained
> in the framework but they address scenarios, where the *scenario(s)*
> should be covered in the framework) are:
>  * RFC 2767 (Bump in the Stack)
>  * RFC 3338 (Bump in the API)
>  * RFC 3493's use of V4MAPPED addresses
>  * RFC 3142 (a TCP/UDP relay)
> 
> For example, if you have an IPv4-application listening for incoming
> connections, on a node that has both IPv4 and IPv6 provisioned,
> and IPv4 and IPv6 addresses in DNS, then how can a client in an
> IPv6-only network talk to it?  (There could be a translator in
> the dual stack host, or a TDP/UDP relay, or the DNS ALG might
> synthesize AAAA records even though there's a real AAAA record
> - I brought this to the attention of the DNS64 draft authors in
> separate email.)  Currently this scenario isn't even mentioned,
> but should be, in my view.
> 
> -Dave
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From xuxh@huawei.com  Tue Apr 14 21:13:13 2009
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Date: Wed, 15 Apr 2009 12:14:21 +0800
From: Xu Xiaohu 
In-reply-to: <49E4B3F5.4080603@it.uc3m.es>
To: 'marcelo bagnulo braun' , 'Behave WG' 
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Subject: Re: [BEHAVE] trade-offs handling multiple state-full v4v6 translators
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Hi,

> Because the different NAT64 boxes are likely to have 
> different pool of 
> public IPv4 addresses, then, it seems challenging to preserve 
> established communications through the failure of a NAT64 box.

> So, preserving established connections through failure of one 
> NAT64 box 
> is not a goal for NAT64. Makes sense?

IMHO, keeping the established session uninterrupted during the switchover of
NAT64 boxes should be desired, but not required.
 
> 
> -------------- Option 1 
> --------------------------------------------------
> 
> So, one obvious choice is that we assign the same Prefix64 to 
> both NAT64 
> boxes and that both NAT64 boxes inject a route towards that prefix in 
> the IPv6 routing domain.
> 
> The result is that we do have some load sharing, cause IPv6 
> hosts will 
> use the NAT64 box that is closer (according to the IGP) and 
> in case of a 
> failure of one of the boxes, new communications will be routed to the 
> alternative NAT64 box, since we assume that the route to the former 
> NAT64 box disappear when the NAT64 box went down. The 
> limitation of this 
> approach is that it may be possible, due to intra site routing 
> fluctuations, that packets of a given communication that were 
> originally 
> using a NAT64 box end up using a different NAT64 box and the 
> communication is interrupted.
 
> So, is this acceptable? If not, we can explore other options.

Not acceptable, IMO.

> 
> -------------- Option 2 
> --------------------------------------------------
> 
> One possible way to address this problem is for the different NAT64 
> boxes to announce a more specific prefix and the less 
> specific prefix. 

> A first limitation is that the resulting load sharing 
> capabilities are 
> far from optimal. IPv4 addresses usage is not uniformly distributed 
> accross the IPv4 address space, so it is likely that one of the NAT64 
> boxes will get more load than the other one with this simple approach 
> (this needs to be confirmed, but it seems this can be the case).
> 
> A second, probably much more serious limitation, is that this 
> seems to 
> break current nat traversal techniques (since it would break endpoint 
> independent behaviour)(*). The problem is that when an IPv6 
> host behind 
> two NAT64 boxes announcing different prefixes try to communicate with 
> different IPv4 target hosts, the packets can be routed 
> through different 
> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
> different IPv4 addresses. ...
>I understand that this is exactly the 
> behaviour that not 
> desired and that NAT traversal techniques would not work if 
> this case. 
> Is this correct? Is this acceptable?

What's the side-effect if the same host will appear to the *different* IPv4
hosts with 
different IPv4 addresses?

> If not acceptable, we can explore other alternatives.
> 
> -------------- Option 3 
> --------------------------------------------------
> 
> A simple alternative option would be for the NAT64 boxes to use a 
> different Prefix64. In this case, NAT64a would use Prefix64a 
> and NAT64b 
> would use Prefix64b. NAT64a will inject Prefix64a in the 
> routing system 
> and NAT64b will inject PRefix64b in the IGP. Let's assume there is no 
> relationship whatsoever between the two prefixes for now.
> 
> With this approach, we can solve the previous problem, since packets 
> containing  destination address with PRefix64a will always be routed 
> towards NAT64a as long as the NAT64a box is reachable. Same 
> for NAT64b. 
> The problem though is that if one of the boxes fail, packets 
> containing 
> a destination address with one of the prefixes will never be 
> delivered 
> to the alternative box, beating the fault tolerance purpose.
> 
> We consider next some approaches to overcome this limitation.
> 
> -------------- Option 4 
> --------------------------------------------------
> 
> One option is to involve the DNS64 at this point. So, if we have two 
> Prefix64, the DNS64 can synthesize using any of them.
> In order to provide fault tolerance, the DNS64 could actually 
> return two 
> synthetic AAAA RR, one with each prefix. In this way, if a 
> NAT64 box is 
> down, the initiating host will try with the alternative AAAA 
> RR and will 
> use the alternative prefix, hence the alternative NAT64 box. In this 
> case, the fault recovery is up to the host. Is this acceptable? 

Both option 4 and 5 are not acceptable since they require IPv6 hosts to
determine the availability of the prefix64, IMO.
 
> -------------- Option 5 
> --------------------------------------------------
> 
> Finally, another way of dealing with multiple prefixes is for 
> the NAT64 
> boxes to be aware of the multiple prefixes.
> In this case, both NAT64 boxes announce both prefixes but 
> with different 
> distance. So NAT64a announces a route in the IGP to Prefix64a with a 
> short distance and also announces a route towards Prefix64b 
> but with a 
> high distance. NAT64b does the opposite i.e. announce the two routes 
> with the distances interchanged.
> DNS64 will behave in the same way as in the previous case. The 
> difference, is that both NAT64 boxes can support both prefixes, so in 
> case one NAT64 box fails, there is no need for the host to retry with 
> the alternative prefix, since the remaining NAT64 box can handle both 
> prefixes.

This sounds acceptable. Besides, the distance for the same prefix64 route
set by different NAT64 boxes should be much different so as to overcome the
influence of the route fluctuation mentioned in option 1.

> The downside with this is that the NAT64 needs to keep track of which 
> IPv6 source address is using which Prefix64, so it requires 
> more state 
> in the NAT64 and its processing becomes more complex (and 
> what's more it 
> make the state machine more complex, needing to handle 
> different states 
> based on the incoming source address and prefix combinations)

Why should the NAT64 box keep track of which IPv6 source address is using
which Prefix64, Could you explain more? 

Xiaohu


From joelja@bogus.com  Tue Apr 14 21:35:32 2009
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] trade-offs handling multiple state-full v4v6	translators
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Xu Xiaohu wrote:
> Hi,
> 
>> Because the different NAT64 boxes are likely to have 
>> different pool of 
>> public IPv4 addresses, then, it seems challenging to preserve 
>> established communications through the failure of a NAT64 box.
> 
>> So, preserving established connections through failure of one 
>> NAT64 box 
>> is not a goal for NAT64. Makes sense?
> 
> IMHO, keeping the established session uninterrupted during the switchover of
> NAT64 boxes should be desired, but not required.

If it's invisble to the host stack's on either end then no big deal, if
it requires that one or the other of them change that clearly has
implications for cases in which it can be deployed.

If they were deployed with some vrrp like equivalence then it's up the
the implementation to mirror state between the two boxes.

>> -------------- Option 1 
>> --------------------------------------------------
>>
>> So, one obvious choice is that we assign the same Prefix64 to 
>> both NAT64 
>> boxes and that both NAT64 boxes inject a route towards that prefix in 
>> the IPv6 routing domain.
>>
>> The result is that we do have some load sharing, cause IPv6 
>> hosts will 
>> use the NAT64 box that is closer (according to the IGP) and 
>> in case of a 
>> failure of one of the boxes, new communications will be routed to the 
>> alternative NAT64 box, since we assume that the route to the former 
>> NAT64 box disappear when the NAT64 box went down. The 
>> limitation of this 
>> approach is that it may be possible, due to intra site routing 
>> fluctuations, that packets of a given communication that were 
>> originally 
>> using a NAT64 box end up using a different NAT64 box and the 
>> communication is interrupted.
>  
>> So, is this acceptable? If not, we can explore other options.
> 
> Not acceptable, IMO.
> 
>> -------------- Option 2 
>> --------------------------------------------------
>>
>> One possible way to address this problem is for the different NAT64 
>> boxes to announce a more specific prefix and the less 
>> specific prefix. 
> 
>> A first limitation is that the resulting load sharing 
>> capabilities are 
>> far from optimal. IPv4 addresses usage is not uniformly distributed 
>> accross the IPv4 address space, so it is likely that one of the NAT64 
>> boxes will get more load than the other one with this simple approach 
>> (this needs to be confirmed, but it seems this can be the case).
>>
>> A second, probably much more serious limitation, is that this 
>> seems to 
>> break current nat traversal techniques (since it would break endpoint 
>> independent behaviour)(*). The problem is that when an IPv6 
>> host behind 
>> two NAT64 boxes announcing different prefixes try to communicate with 
>> different IPv4 target hosts, the packets can be routed 
>> through different 
>> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
>> different IPv4 addresses. ...
>> I understand that this is exactly the 
>> behaviour that not 
>> desired and that NAT traversal techniques would not work if 
>> this case. 
>> Is this correct? Is this acceptable?
> 
> What's the side-effect if the same host will appear to the *different* IPv4
> hosts with 
> different IPv4 addresses?
> 
>> If not acceptable, we can explore other alternatives.
>>
>> -------------- Option 3 
>> --------------------------------------------------
>>
>> A simple alternative option would be for the NAT64 boxes to use a 
>> different Prefix64. In this case, NAT64a would use Prefix64a 
>> and NAT64b 
>> would use Prefix64b. NAT64a will inject Prefix64a in the 
>> routing system 
>> and NAT64b will inject PRefix64b in the IGP. Let's assume there is no 
>> relationship whatsoever between the two prefixes for now.
>>
>> With this approach, we can solve the previous problem, since packets 
>> containing  destination address with PRefix64a will always be routed 
>> towards NAT64a as long as the NAT64a box is reachable. Same 
>> for NAT64b. 
>> The problem though is that if one of the boxes fail, packets 
>> containing 
>> a destination address with one of the prefixes will never be 
>> delivered 
>> to the alternative box, beating the fault tolerance purpose.
>>
>> We consider next some approaches to overcome this limitation.
>>
>> -------------- Option 4 
>> --------------------------------------------------
>>
>> One option is to involve the DNS64 at this point. So, if we have two 
>> Prefix64, the DNS64 can synthesize using any of them.
>> In order to provide fault tolerance, the DNS64 could actually 
>> return two 
>> synthetic AAAA RR, one with each prefix. In this way, if a 
>> NAT64 box is 
>> down, the initiating host will try with the alternative AAAA 
>> RR and will 
>> use the alternative prefix, hence the alternative NAT64 box. In this 
>> case, the fault recovery is up to the host. Is this acceptable? 
> 
> Both option 4 and 5 are not acceptable since they require IPv6 hosts to
> determine the availability of the prefix64, IMO.
>  
>> -------------- Option 5 
>> --------------------------------------------------
>>
>> Finally, another way of dealing with multiple prefixes is for 
>> the NAT64 
>> boxes to be aware of the multiple prefixes.
>> In this case, both NAT64 boxes announce both prefixes but 
>> with different 
>> distance. So NAT64a announces a route in the IGP to Prefix64a with a 
>> short distance and also announces a route towards Prefix64b 
>> but with a 
>> high distance. NAT64b does the opposite i.e. announce the two routes 
>> with the distances interchanged.
>> DNS64 will behave in the same way as in the previous case. The 
>> difference, is that both NAT64 boxes can support both prefixes, so in 
>> case one NAT64 box fails, there is no need for the host to retry with 
>> the alternative prefix, since the remaining NAT64 box can handle both 
>> prefixes.
> 
> This sounds acceptable. Besides, the distance for the same prefix64 route
> set by different NAT64 boxes should be much different so as to overcome the
> influence of the route fluctuation mentioned in option 1.
> 
>> The downside with this is that the NAT64 needs to keep track of which 
>> IPv6 source address is using which Prefix64, so it requires 
>> more state 
>> in the NAT64 and its processing becomes more complex (and 
>> what's more it 
>> make the state machine more complex, needing to handle 
>> different states 
>> based on the incoming source address and prefix combinations)
> 
> Why should the NAT64 box keep track of which IPv6 source address is using
> which Prefix64, Could you explain more? 
> 
> Xiaohu
> 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
> 

From xuxh@huawei.com  Tue Apr 14 22:36:02 2009
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Date: Wed, 15 Apr 2009 13:37:02 +0800
From: Xu Xiaohu 
In-reply-to: <49E56398.5080102@bogus.com>
To: 'Joel Jaeggli' 
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] trade-offs handling multiple state-full	v4v6	translators
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> > IMHO, keeping the established session uninterrupted during the 
> > switchover of
> > NAT64 boxes should be desired, but not required.
> 
> If it's invisble to the host stack's on either end then no 
> big deal, if it requires that one or the other of them change 
> that clearly has implications for cases in which it can be deployed.
> 
> If they were deployed with some vrrp like equivalence then 
> it's up the the implementation to mirror state between the two boxes.

I fully agree. In fact, we can extend the option 5 by running some VRRP like
keepalive mechanism on two NAT64 boxes and selecting one as primary NAT64
for group A (prefix64-A and IPv4 Pool A)and secondary  NAT64 for group B
(prefix64-B, and IPv4 Pool B),  another one as primary  NAT64 for group B
and secondary NAT64 for group A, the primary NAT64 for group A (or group B)
will advertise the route to that prefix64-A (or prefix64-B)on IPv6 side and
the route to IPv4 pool A (or IPv4 Pool B) on IPv4 side , while the secondary
one can either not advertise those routes or advertise them with high cost.
Besides, the primary and the secondary could synchronize the mapping info.
In this way, we could achieve hot standby NAT64.

Xiaohu

> >> So, one obvious choice is that we assign the same Prefix64 to both 
> >> NAT64 boxes and that both NAT64 boxes inject a route towards that 
> >> prefix in the IPv6 routing domain.
> >>
> >> The result is that we do have some load sharing, cause IPv6 hosts 
> >> will use the NAT64 box that is closer (according to the 
> IGP) and in 
> >> case of a failure of one of the boxes, new communications will be 
> >> routed to the alternative NAT64 box, since we assume that 
> the route 
> >> to the former
> >> NAT64 box disappear when the NAT64 box went down. The 
> limitation of 
> >> this approach is that it may be possible, due to intra 
> site routing 
> >> fluctuations, that packets of a given communication that were 
> >> originally using a NAT64 box end up using a different 
> NAT64 box and 
> >> the communication is interrupted.
> > 
> >> So, is this acceptable? If not, we can explore other options.
> > 
> > Not acceptable, IMO.
> > 
> >> -------------- Option 2
> >> --------------------------------------------------
> >>
> >> One possible way to address this problem is for the 
> different NAT64 
> >> boxes to announce a more specific prefix and the less specific 
> >> prefix.
> > 
> >> A first limitation is that the resulting load sharing capabilities 
> >> are far from optimal. IPv4 addresses usage is not uniformly 
> >> distributed accross the IPv4 address space, so it is 
> likely that one 
> >> of the NAT64 boxes will get more load than the other one with this 
> >> simple approach (this needs to be confirmed, but it seems 
> this can be 
> >> the case).
> >>
> >> A second, probably much more serious limitation, is that 
> this seems 
> >> to break current nat traversal techniques (since it would break 
> >> endpoint independent behaviour)(*). The problem is that 
> when an IPv6 
> >> host behind two NAT64 boxes announcing different prefixes try to 
> >> communicate with different IPv4 target hosts, the packets can be 
> >> routed through different
> >> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
> >> different IPv4 addresses. ...
> >> I understand that this is exactly the behaviour that not 
> desired and 
> >> that NAT traversal techniques would not work if this case.
> >> Is this correct? Is this acceptable?
> > 
> > What's the side-effect if the same host will appear to the 
> *different* 
> > IPv4 hosts with different IPv4 addresses?
> > 
> >> If not acceptable, we can explore other alternatives.
> >>
> >> -------------- Option 3
> >> --------------------------------------------------
> >>
> >> A simple alternative option would be for the NAT64 boxes to use a 
> >> different Prefix64. In this case, NAT64a would use Prefix64a and 
> >> NAT64b would use Prefix64b. NAT64a will inject Prefix64a in the 
> >> routing system and NAT64b will inject PRefix64b in the IGP. Let's 
> >> assume there is no relationship whatsoever between the two 
> prefixes 
> >> for now.
> >>
> >> With this approach, we can solve the previous problem, 
> since packets 
> >> containing  destination address with PRefix64a will always 
> be routed 
> >> towards NAT64a as long as the NAT64a box is reachable. Same for 
> >> NAT64b.
> >> The problem though is that if one of the boxes fail, packets 
> >> containing a destination address with one of the prefixes 
> will never 
> >> be delivered to the alternative box, beating the fault tolerance 
> >> purpose.
> >>
> >> We consider next some approaches to overcome this limitation.
> >>
> >> -------------- Option 4
> >> --------------------------------------------------
> >>
> >> One option is to involve the DNS64 at this point. So, if 
> we have two 
> >> Prefix64, the DNS64 can synthesize using any of them.
> >> In order to provide fault tolerance, the DNS64 could 
> actually return 
> >> two synthetic AAAA RR, one with each prefix. In this way, if a
> >> NAT64 box is
> >> down, the initiating host will try with the alternative 
> AAAA RR and 
> >> will use the alternative prefix, hence the alternative 
> NAT64 box. In 
> >> this case, the fault recovery is up to the host. Is this 
> acceptable?
> > 
> > Both option 4 and 5 are not acceptable since they require 
> IPv6 hosts 
> > to determine the availability of the prefix64, IMO.
> >  
> >> -------------- Option 5
> >> --------------------------------------------------
> >>
> >> Finally, another way of dealing with multiple prefixes is for the 
> >> NAT64 boxes to be aware of the multiple prefixes.
> >> In this case, both NAT64 boxes announce both prefixes but with 
> >> different distance. So NAT64a announces a route in the IGP to 
> >> Prefix64a with a short distance and also announces a route towards 
> >> Prefix64b but with a high distance. NAT64b does the opposite i.e. 
> >> announce the two routes with the distances interchanged.
> >> DNS64 will behave in the same way as in the previous case. The 
> >> difference, is that both NAT64 boxes can support both 
> prefixes, so in 
> >> case one NAT64 box fails, there is no need for the host to 
> retry with 
> >> the alternative prefix, since the remaining NAT64 box can 
> handle both 
> >> prefixes.
> > 
> > This sounds acceptable. Besides, the distance for the same prefix64 
> > route set by different NAT64 boxes should be much different 
> so as to 
> > overcome the influence of the route fluctuation mentioned 
> in option 1.
> > 
> >> The downside with this is that the NAT64 needs to keep 
> track of which
> >> IPv6 source address is using which Prefix64, so it requires more 
> >> state in the NAT64 and its processing becomes more complex (and 
> >> what's more it make the state machine more complex, 
> needing to handle 
> >> different states based on the incoming source address and prefix 
> >> combinations)
> > 
> > Why should the NAT64 box keep track of which IPv6 source address is 
> > using which Prefix64, Could you explain more?
> > 
> > Xiaohu
> > 
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
> > 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From marcelo@it.uc3m.es  Wed Apr 15 00:51:06 2009
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From: marcelo bagnulo braun 
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To: Fred Baker 
References: 	<7CCEA676-DC64-4CE6-A3BF-D5F7605C2A5F@magma.ca> <07600313-D7B8-4E82-94D5-9306C9F3033D@cisco.com>
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Cc: Behave WG , Philip Matthews , Behave Chairs 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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Fred Baker escribió:
> That is sheer idiocy, and is exactly what I expect to se happen if you 
> force the galloping complexity you propose here on me. The 
> specification is already five documents (framework, translation, 
> stateful translation database, DNS ALG, and FTP ALG) and as of Tuesday 
> is slated to become six documents, splitting the prefix out of the 
> framework document into a document that you are asking me to not refer 
> to but which was internal to SIIT and was referred to in several places.
>

since the WK prefix is going to be used only in the statefull translator 
i would suggest we assign the WK prefix in the IANA cosniderations of 
the statefull draft.
So, we would keep all the discussion about the prefixes in the framework 
document as it is, we keep it informational, and we make the actual 
request for the prefix in the IANA considerations of the statefull draft.
In this way, we keep the number of documents lower, we keep the 
framework as informational with the overall prefix analysis and 
reccomendations, and we define the WK prefix in the a standard track 
document.
We should also include Brian proposed text on filtering the WK prefix in 
both documents imho

Would that make sense to you?

Regards, marcelo

From marcelo@it.uc3m.es  Wed Apr 15 01:32:41 2009
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From: marcelo bagnulo braun 
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References: 	<67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org>	<49CB85A9.6090903@cernet.edu.cn> <49CB9763.4060705@it.uc3m.es> <49CCDD7D.3000704@cernet.edu.cn> <49CCE6F4.5020903@gmail.com> <49E30985.40101@it.uc3m.es> <49E54E5A.2010006@gmail.com>
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Cc: Behave WG , Xing Li , Fred Baker , Hiroshi MIYATA , Behave Chairs 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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agree
thanks, marcelo



Brian E Carpenter escribió:
> On 2009-04-13 21:44, marcelo bagnulo braun wrote:
>   
>> Brian E Carpenter escribió:
>>     
>>> And the same practice would need to be used for the WKP: more specifics
>>> not allowed. BTW that might recreate some of the black hole issues
>>> we see for 6to4. 
>>>       
>> could you expand on how this would be?
>>     
>
> At least two bad things happen with 6to4 if the WKP is incorrectly
> advertised or filtered.
>
> 1. 2002::/16 is advertised too far - that is to say, A advertises it to B,
> but the relay that A is operating has an ACL that drops IPv6 packets from
> outside A. Users sending native IPv6 packets to a 6to4 destination via B
> will be sending them into a black hole. In this case, A was wrong to
> export the prefix.
>
> 2. 2002::/16 is advertised too short - that is to say, A advertises it to B,
> *and* is willing to relay IPv6 packets from B, but B drops the route. Users
> sending native IPv6 packets to a 6to4 destination via B will get Destination
> Unreachable. In this case, B was wrong to filter the prefix.
>
> Actually, the correct solution is that every ISP offering native IPv6 service
> MUST either operate an inbound (to 6to4) relay or support a 2002::/16 route
> to such a relay, and MUST NOT advertise such a route to other ISPs unless
> it is willing to accept all traffic.
>
> I'm sure similar problems would arise with a NAT64 WKP, if used carelessly.
> But I think Xing Li's analysis a few days ago was correct.
>
>    Brian
>
>
>   


From marcelo@it.uc3m.es  Wed Apr 15 01:50:08 2009
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] trade-offs handling multiple state-full v4v6 translators
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Xu Xiaohu escribió:
> Hi,
>
>   
>> Because the different NAT64 boxes are likely to have 
>> different pool of 
>> public IPv4 addresses, then, it seems challenging to preserve 
>> established communications through the failure of a NAT64 box.
>>     
>
>   
>> So, preserving established connections through failure of one 
>> NAT64 box 
>> is not a goal for NAT64. Makes sense?
>>     
>
> IMHO, keeping the established session uninterrupted during the switchover of
> NAT64 boxes should be desired, but not required.
>   

makes sense
so, this basically means that in the base NAT64 spec we don't provide 
this feature, but another draft can provide it
>  



>> A second, probably much more serious limitation, is that this 
>> seems to 
>> break current nat traversal techniques (since it would break endpoint 
>> independent behaviour)(*). The problem is that when an IPv6 
>> host behind 
>> two NAT64 boxes announcing different prefixes try to communicate with 
>> different IPv4 target hosts, the packets can be routed 
>> through different 
>> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
>> different IPv4 addresses. ...
>> I understand that this is exactly the 
>> behaviour that not 
>> desired and that NAT traversal techniques would not work if 
>> this case. 
>> Is this correct? Is this acceptable?
>>     
>
> What's the side-effect if the same host will appear to the *different* IPv4
> hosts with 
> different IPv4 addresses?
>
>   
this basically would break endpoint independent behaviour
Endpoint independent behaviour means exactly that, that the same 
transport address is used when contacting different external hosts
(the definition of endpoint independence actually applies to the 
behaviour of a single nat box. but sending packets from the same node to 
different destinations through different nat boxes would actually have 
the same external behaviour of a nat box without endpoint independent 
behaviour AFAICT)

I understand that current NAT traversal techniques work better if 
endpoint independent behaviour is used, but i am no NAT traversal 
expert, maybe someone else can confirm that (this was actually the goal 
of a my email)



>> If not acceptable, we can explore other alternatives.
>>
>> -------------- Option 3 
>> --------------------------------------------------
>>
>> A simple alternative option would be for the NAT64 boxes to use a 
>> different Prefix64. In this case, NAT64a would use Prefix64a 
>> and NAT64b 
>> would use Prefix64b. NAT64a will inject Prefix64a in the 
>> routing system 
>> and NAT64b will inject PRefix64b in the IGP. Let's assume there is no 
>> relationship whatsoever between the two prefixes for now.
>>
>> With this approach, we can solve the previous problem, since packets 
>> containing  destination address with PRefix64a will always be routed 
>> towards NAT64a as long as the NAT64a box is reachable. Same 
>> for NAT64b. 
>> The problem though is that if one of the boxes fail, packets 
>> containing 
>> a destination address with one of the prefixes will never be 
>> delivered 
>> to the alternative box, beating the fault tolerance purpose.
>>
>> We consider next some approaches to overcome this limitation.
>>
>> -------------- Option 4 
>> --------------------------------------------------
>>
>> One option is to involve the DNS64 at this point. So, if we have two 
>> Prefix64, the DNS64 can synthesize using any of them.
>> In order to provide fault tolerance, the DNS64 could actually 
>> return two 
>> synthetic AAAA RR, one with each prefix. In this way, if a 
>> NAT64 box is 
>> down, the initiating host will try with the alternative AAAA 
>> RR and will 
>> use the alternative prefix, hence the alternative NAT64 box. In this 
>> case, the fault recovery is up to the host. Is this acceptable? 
>>     
>
> Both option 4 and 5 are not acceptable since they require IPv6 hosts to
> determine the availability of the prefix64, IMO.
>   

Not really
Option 5 would actually be compliant with current host behaviour i.e. 
does not need changes to current hosts
Option 5 basically works as follows. The DNS64 returns two AAAA RR with 
different prefixes on it. the host will try with the first one. If 
doesn't work it will try with the second one. This is exactly what hosts 
do today when they receive multiple RR for a DNS query.
So, it would work just fine and it ia actually a commonly used method to 
provide redundancy for servers i.e. multiple RR in the DNS corresponding 
to differnet redundant servers

>  
>   
>> -------------- Option 5 
>> --------------------------------------------------
>>
>> Finally, another way of dealing with multiple prefixes is for 
>> the NAT64 
>> boxes to be aware of the multiple prefixes.
>> In this case, both NAT64 boxes announce both prefixes but 
>> with different 
>> distance. So NAT64a announces a route in the IGP to Prefix64a with a 
>> short distance and also announces a route towards Prefix64b 
>> but with a 
>> high distance. NAT64b does the opposite i.e. announce the two routes 
>> with the distances interchanged.
>> DNS64 will behave in the same way as in the previous case. The 
>> difference, is that both NAT64 boxes can support both prefixes, so in 
>> case one NAT64 box fails, there is no need for the host to retry with 
>> the alternative prefix, since the remaining NAT64 box can handle both 
>> prefixes.
>>     
>
> This sounds acceptable. Besides, the distance for the same prefix64 route
> set by different NAT64 boxes should be much different so as to overcome the
> influence of the route fluctuation mentioned in option 1.
>
>   
>> The downside with this is that the NAT64 needs to keep track of which 
>> IPv6 source address is using which Prefix64, so it requires 
>> more state 
>> in the NAT64 and its processing becomes more complex (and 
>> what's more it 
>> make the state machine more complex, needing to handle 
>> different states 
>> based on the incoming source address and prefix combinations)
>>     
>
> Why should the NAT64 box keep track of which IPv6 source address is using
> which Prefix64, Could you explain more? 
>
>   
because when it receives packets in the reverse direction, it needs to 
know which prefix to use in IPv6 packet (as a source prefix)
when the NAT64 box can use more than one prefix, then it needs to keep 
track of which prefix has used for every flow it is processing. this is 
considerable additional complexity imho and i am not sure it is worth 
the advantages.

Regards, marcelo


> Xiaohu
>
>
>   


From marcelo@it.uc3m.es  Wed Apr 15 01:54:08 2009
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Cc: 'Behave WG' , Xu Xiaohu 
Subject: Re: [BEHAVE] trade-offs handling multiple state-full v4v6	translators
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Joel Jaeggli escribió:
> Xu Xiaohu wrote:
>   
>> Hi,
>>
>>     
>>> Because the different NAT64 boxes are likely to have 
>>> different pool of 
>>> public IPv4 addresses, then, it seems challenging to preserve 
>>> established communications through the failure of a NAT64 box.
>>>       
>>> So, preserving established connections through failure of one 
>>> NAT64 box 
>>> is not a goal for NAT64. Makes sense?
>>>       
>> IMHO, keeping the established session uninterrupted during the switchover of
>> NAT64 boxes should be desired, but not required.
>>     
>
> If it's invisble to the host stack's on either end then no big deal, if
> it requires that one or the other of them change that clearly has
> implications for cases in which it can be deployed.
>
> If they were deployed with some vrrp like equivalence then it's up the
> the implementation to mirror state between the two boxes.
>   

right
but you can only do that if both NAT boxes can use the same pool of 
public addresses.

I mean, this really depends on the topology
If you are using, different NAT64 noxes to connect to different ISP and 
you are using PA addressing, then this does not work
If you are using PI addresses, then you are in business
If you are using a DMZ kind of topology, where all NAT64 are in the same 
link and all the access routers to all you ISPs are connected so all 
nats can use any address, then you are in business (with PA or PI 
addressing)

Clearly in the last two cases, you need a protocol between the NAT64 
boxes to keep track of the state.

but i guess we are on the same page

Regards, marcelo

>   
>>> -------------- Option 1 
>>> --------------------------------------------------
>>>
>>> So, one obvious choice is that we assign the same Prefix64 to 
>>> both NAT64 
>>> boxes and that both NAT64 boxes inject a route towards that prefix in 
>>> the IPv6 routing domain.
>>>
>>> The result is that we do have some load sharing, cause IPv6 
>>> hosts will 
>>> use the NAT64 box that is closer (according to the IGP) and 
>>> in case of a 
>>> failure of one of the boxes, new communications will be routed to the 
>>> alternative NAT64 box, since we assume that the route to the former 
>>> NAT64 box disappear when the NAT64 box went down. The 
>>> limitation of this 
>>> approach is that it may be possible, due to intra site routing 
>>> fluctuations, that packets of a given communication that were 
>>> originally 
>>> using a NAT64 box end up using a different NAT64 box and the 
>>> communication is interrupted.
>>>       
>>  
>>     
>>> So, is this acceptable? If not, we can explore other options.
>>>       
>> Not acceptable, IMO.
>>
>>     
>>> -------------- Option 2 
>>> --------------------------------------------------
>>>
>>> One possible way to address this problem is for the different NAT64 
>>> boxes to announce a more specific prefix and the less 
>>> specific prefix. 
>>>       
>> 
>>     
>>> A first limitation is that the resulting load sharing 
>>> capabilities are 
>>> far from optimal. IPv4 addresses usage is not uniformly distributed 
>>> accross the IPv4 address space, so it is likely that one of the NAT64 
>>> boxes will get more load than the other one with this simple approach 
>>> (this needs to be confirmed, but it seems this can be the case).
>>>
>>> A second, probably much more serious limitation, is that this 
>>> seems to 
>>> break current nat traversal techniques (since it would break endpoint 
>>> independent behaviour)(*). The problem is that when an IPv6 
>>> host behind 
>>> two NAT64 boxes announcing different prefixes try to communicate with 
>>> different IPv4 target hosts, the packets can be routed 
>>> through different 
>>> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
>>> different IPv4 addresses. ...
>>> I understand that this is exactly the 
>>> behaviour that not 
>>> desired and that NAT traversal techniques would not work if 
>>> this case. 
>>> Is this correct? Is this acceptable?
>>>       
>> What's the side-effect if the same host will appear to the *different* IPv4
>> hosts with 
>> different IPv4 addresses?
>>
>>     
>>> If not acceptable, we can explore other alternatives.
>>>
>>> -------------- Option 3 
>>> --------------------------------------------------
>>>
>>> A simple alternative option would be for the NAT64 boxes to use a 
>>> different Prefix64. In this case, NAT64a would use Prefix64a 
>>> and NAT64b 
>>> would use Prefix64b. NAT64a will inject Prefix64a in the 
>>> routing system 
>>> and NAT64b will inject PRefix64b in the IGP. Let's assume there is no 
>>> relationship whatsoever between the two prefixes for now.
>>>
>>> With this approach, we can solve the previous problem, since packets 
>>> containing  destination address with PRefix64a will always be routed 
>>> towards NAT64a as long as the NAT64a box is reachable. Same 
>>> for NAT64b. 
>>> The problem though is that if one of the boxes fail, packets 
>>> containing 
>>> a destination address with one of the prefixes will never be 
>>> delivered 
>>> to the alternative box, beating the fault tolerance purpose.
>>>
>>> We consider next some approaches to overcome this limitation.
>>>
>>> -------------- Option 4 
>>> --------------------------------------------------
>>>
>>> One option is to involve the DNS64 at this point. So, if we have two 
>>> Prefix64, the DNS64 can synthesize using any of them.
>>> In order to provide fault tolerance, the DNS64 could actually 
>>> return two 
>>> synthetic AAAA RR, one with each prefix. In this way, if a 
>>> NAT64 box is 
>>> down, the initiating host will try with the alternative AAAA 
>>> RR and will 
>>> use the alternative prefix, hence the alternative NAT64 box. In this 
>>> case, the fault recovery is up to the host. Is this acceptable? 
>>>       
>> Both option 4 and 5 are not acceptable since they require IPv6 hosts to
>> determine the availability of the prefix64, IMO.
>>  
>>     
>>> -------------- Option 5 
>>> --------------------------------------------------
>>>
>>> Finally, another way of dealing with multiple prefixes is for 
>>> the NAT64 
>>> boxes to be aware of the multiple prefixes.
>>> In this case, both NAT64 boxes announce both prefixes but 
>>> with different 
>>> distance. So NAT64a announces a route in the IGP to Prefix64a with a 
>>> short distance and also announces a route towards Prefix64b 
>>> but with a 
>>> high distance. NAT64b does the opposite i.e. announce the two routes 
>>> with the distances interchanged.
>>> DNS64 will behave in the same way as in the previous case. The 
>>> difference, is that both NAT64 boxes can support both prefixes, so in 
>>> case one NAT64 box fails, there is no need for the host to retry with 
>>> the alternative prefix, since the remaining NAT64 box can handle both 
>>> prefixes.
>>>       
>> This sounds acceptable. Besides, the distance for the same prefix64 route
>> set by different NAT64 boxes should be much different so as to overcome the
>> influence of the route fluctuation mentioned in option 1.
>>
>>     
>>> The downside with this is that the NAT64 needs to keep track of which 
>>> IPv6 source address is using which Prefix64, so it requires 
>>> more state 
>>> in the NAT64 and its processing becomes more complex (and 
>>> what's more it 
>>> make the state machine more complex, needing to handle 
>>> different states 
>>> based on the incoming source address and prefix combinations)
>>>       
>> Why should the NAT64 box keep track of which IPv6 source address is using
>> which Prefix64, Could you explain more? 
>>
>> Xiaohu
>>
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>>
>>     
>
>   


From marcelo@it.uc3m.es  Wed Apr 15 01:56:14 2009
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Cc: 'Joel Jaeggli' , 'Behave WG' 
Subject: Re: [BEHAVE] trade-offs handling multiple	state-full	v4v6	translators
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Xu Xiaohu escribió:
>>> IMHO, keeping the established session uninterrupted during the 
>>> switchover of
>>> NAT64 boxes should be desired, but not required.
>>>       
>> If it's invisble to the host stack's on either end then no 
>> big deal, if it requires that one or the other of them change 
>> that clearly has implications for cases in which it can be deployed.
>>
>> If they were deployed with some vrrp like equivalence then 
>> it's up the the implementation to mirror state between the two boxes.
>>     
>
> I fully agree. In fact, we can extend the option 5 by running some VRRP like
> keepalive mechanism on two NAT64 boxes and selecting one as primary NAT64
> for group A (prefix64-A and IPv4 Pool A)and secondary  NAT64 for group B
> (prefix64-B, and IPv4 Pool B),  another one as primary  NAT64 for group B
> and secondary NAT64 for group A, the primary NAT64 for group A (or group B)
> will advertise the route to that prefix64-A (or prefix64-B)on IPv6 side and
> the route to IPv4 pool A (or IPv4 Pool B) on IPv4 side , while the secondary
> one can either not advertise those routes or advertise them with high cost.
> Besides, the primary and the secondary could synchronize the mapping info.
> In this way, we could achieve hot standby NAT64.
>   

I think you are mixing the two problems here
the options presented above are only for establishing new connection
If you want to preserve estbalished connection, itis a completelly 
different problem and i would suggest we keep them separated.

Regards, marcelo


> Xiaohu
>
>   
>>>> So, one obvious choice is that we assign the same Prefix64 to both 
>>>> NAT64 boxes and that both NAT64 boxes inject a route towards that 
>>>> prefix in the IPv6 routing domain.
>>>>
>>>> The result is that we do have some load sharing, cause IPv6 hosts 
>>>> will use the NAT64 box that is closer (according to the 
>>>>         
>> IGP) and in 
>>     
>>>> case of a failure of one of the boxes, new communications will be 
>>>> routed to the alternative NAT64 box, since we assume that 
>>>>         
>> the route 
>>     
>>>> to the former
>>>> NAT64 box disappear when the NAT64 box went down. The 
>>>>         
>> limitation of 
>>     
>>>> this approach is that it may be possible, due to intra 
>>>>         
>> site routing 
>>     
>>>> fluctuations, that packets of a given communication that were 
>>>> originally using a NAT64 box end up using a different 
>>>>         
>> NAT64 box and 
>>     
>>>> the communication is interrupted.
>>>>         
>>> 
>>>       
>>>> So, is this acceptable? If not, we can explore other options.
>>>>         
>>> Not acceptable, IMO.
>>>
>>>       
>>>> -------------- Option 2
>>>> --------------------------------------------------
>>>>
>>>> One possible way to address this problem is for the 
>>>>         
>> different NAT64 
>>     
>>>> boxes to announce a more specific prefix and the less specific 
>>>> prefix.
>>>>         
>>> 
>>>       
>>>> A first limitation is that the resulting load sharing capabilities 
>>>> are far from optimal. IPv4 addresses usage is not uniformly 
>>>> distributed accross the IPv4 address space, so it is 
>>>>         
>> likely that one 
>>     
>>>> of the NAT64 boxes will get more load than the other one with this 
>>>> simple approach (this needs to be confirmed, but it seems 
>>>>         
>> this can be 
>>     
>>>> the case).
>>>>
>>>> A second, probably much more serious limitation, is that 
>>>>         
>> this seems 
>>     
>>>> to break current nat traversal techniques (since it would break 
>>>> endpoint independent behaviour)(*). The problem is that 
>>>>         
>> when an IPv6 
>>     
>>>> host behind two NAT64 boxes announcing different prefixes try to 
>>>> communicate with different IPv4 target hosts, the packets can be 
>>>> routed through different
>>>> NAT64 boxes, so the same host will appear to the IPv4 hosts with 
>>>> different IPv4 addresses. ...
>>>> I understand that this is exactly the behaviour that not 
>>>>         
>> desired and 
>>     
>>>> that NAT traversal techniques would not work if this case.
>>>> Is this correct? Is this acceptable?
>>>>         
>>> What's the side-effect if the same host will appear to the 
>>>       
>> *different* 
>>     
>>> IPv4 hosts with different IPv4 addresses?
>>>
>>>       
>>>> If not acceptable, we can explore other alternatives.
>>>>
>>>> -------------- Option 3
>>>> --------------------------------------------------
>>>>
>>>> A simple alternative option would be for the NAT64 boxes to use a 
>>>> different Prefix64. In this case, NAT64a would use Prefix64a and 
>>>> NAT64b would use Prefix64b. NAT64a will inject Prefix64a in the 
>>>> routing system and NAT64b will inject PRefix64b in the IGP. Let's 
>>>> assume there is no relationship whatsoever between the two 
>>>>         
>> prefixes 
>>     
>>>> for now.
>>>>
>>>> With this approach, we can solve the previous problem, 
>>>>         
>> since packets 
>>     
>>>> containing  destination address with PRefix64a will always 
>>>>         
>> be routed 
>>     
>>>> towards NAT64a as long as the NAT64a box is reachable. Same for 
>>>> NAT64b.
>>>> The problem though is that if one of the boxes fail, packets 
>>>> containing a destination address with one of the prefixes 
>>>>         
>> will never 
>>     
>>>> be delivered to the alternative box, beating the fault tolerance 
>>>> purpose.
>>>>
>>>> We consider next some approaches to overcome this limitation.
>>>>
>>>> -------------- Option 4
>>>> --------------------------------------------------
>>>>
>>>> One option is to involve the DNS64 at this point. So, if 
>>>>         
>> we have two 
>>     
>>>> Prefix64, the DNS64 can synthesize using any of them.
>>>> In order to provide fault tolerance, the DNS64 could 
>>>>         
>> actually return 
>>     
>>>> two synthetic AAAA RR, one with each prefix. In this way, if a
>>>> NAT64 box is
>>>> down, the initiating host will try with the alternative 
>>>>         
>> AAAA RR and 
>>     
>>>> will use the alternative prefix, hence the alternative 
>>>>         
>> NAT64 box. In 
>>     
>>>> this case, the fault recovery is up to the host. Is this 
>>>>         
>> acceptable?
>>     
>>> Both option 4 and 5 are not acceptable since they require 
>>>       
>> IPv6 hosts 
>>     
>>> to determine the availability of the prefix64, IMO.
>>>  
>>>       
>>>> -------------- Option 5
>>>> --------------------------------------------------
>>>>
>>>> Finally, another way of dealing with multiple prefixes is for the 
>>>> NAT64 boxes to be aware of the multiple prefixes.
>>>> In this case, both NAT64 boxes announce both prefixes but with 
>>>> different distance. So NAT64a announces a route in the IGP to 
>>>> Prefix64a with a short distance and also announces a route towards 
>>>> Prefix64b but with a high distance. NAT64b does the opposite i.e. 
>>>> announce the two routes with the distances interchanged.
>>>> DNS64 will behave in the same way as in the previous case. The 
>>>> difference, is that both NAT64 boxes can support both 
>>>>         
>> prefixes, so in 
>>     
>>>> case one NAT64 box fails, there is no need for the host to 
>>>>         
>> retry with 
>>     
>>>> the alternative prefix, since the remaining NAT64 box can 
>>>>         
>> handle both 
>>     
>>>> prefixes.
>>>>         
>>> This sounds acceptable. Besides, the distance for the same prefix64 
>>> route set by different NAT64 boxes should be much different 
>>>       
>> so as to 
>>     
>>> overcome the influence of the route fluctuation mentioned 
>>>       
>> in option 1.
>>     
>>>> The downside with this is that the NAT64 needs to keep 
>>>>         
>> track of which
>>     
>>>> IPv6 source address is using which Prefix64, so it requires more 
>>>> state in the NAT64 and its processing becomes more complex (and 
>>>> what's more it make the state machine more complex, 
>>>>         
>> needing to handle 
>>     
>>>> different states based on the incoming source address and prefix 
>>>> combinations)
>>>>         
>>> Why should the NAT64 box keep track of which IPv6 source address is 
>>> using which Prefix64, Could you explain more?
>>>
>>> Xiaohu
>>>
>>> _______________________________________________
>>> Behave mailing list
>>> Behave@ietf.org
>>> https://www.ietf.org/mailman/listinfo/behave
>>>
>>>       
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>>     
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>
>   


From wwaites@googlemail.com  Wed Apr 15 02:41:05 2009
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From: William Waites 
To: marcelo bagnulo braun 
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Cc: Behave WG 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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2009/4/13 marcelo bagnulo braun :
> but this is exactly the problem with this prefix
> I mean, if we use ::/96 as the WK prefix, current rfc3484 default policy
> table will prefer ::/96 than ::ffff:0:0/96
>
> This implies that translated connectivity will be preferred over native I=
Pv4
> connectivity and this exactly what we don't want afaict

True though it is not out of the question that the default policy
be revisited. In fact the policy in section 10.3 of RFC3484 is
probably more reasonable than the default and does not
suffer from this problem.

In fact section 3.2 says, " IPv4 addresses should be treated
as having "preferred" (in the RFC2462 sense) configuration
status." which is satisfied by the policy from section 10.3 but
not by the default policy as far as I can tell.

> Besides, i think that unless there is =A0clear benefit in reusing a prefi=
x, we
> should stay away from reusing prefixes, since it may be possible that
> exisitng implementations handle them in particular ways.

On the other hand there's the question of how multiple
embeddings of the same numbering space - in an ideal
world we would not have ::ffff:0:0/96 either. A v6 node
wanting to talk to a v4 node would use its v4 address
embedded in v6 space. If native v4 connectivity is
available, use that, otherwise route the packets like any
other.

The semantics are clear, an application says, "I want to
talk to X host uniquely identified by that address" and
doesn't have to add routing hints into the address and
worry too much about how it wants to do so.

Put another way, if an address is not configured on a
host should not, in general appear as a destination on
the wire.

Specifically with respect to ::/96, all implementations I
am aware of either ignore it or add a reject route for it in
their startup scripts.

Just my =800.02

-w
--=20
William Waites
+49 30 8894 9942

From wangxuewei@huawei.com  Wed Apr 15 03:40:16 2009
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Date: Wed, 15 Apr 2009 18:41:15 +0800
From: Xuewei Wang 
To: marcelo bagnulo braun , Joel Jaeggli 
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Cc: 'Behave WG' , Xu Xiaohu 
Subject: Re: [BEHAVE] trade-offs handling multiple state-full	v4v6	translators
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From iljitsch@muada.com  Wed Apr 15 04:17:06 2009
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Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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On 15 apr 2009, at 11:42, William Waites wrote:

> On the other hand there's the question of how multiple
> embeddings of the same numbering space - in an ideal
> world we would not have ::ffff:0:0/96 either. A v6 node
> wanting to talk to a v4 node would use its v4 address
> embedded in v6 space. If native v4 connectivity is
> available, use that, otherwise route the packets like any
> other.

This is completely doable with a bump-in-the-API type solution,  
where ::ffff:12.34.56.78 generates IPv4 packets towards 12.34.56.78 if  
there is IPv4 connectivity, but IPv6 packets to Pref64::12.34.56.78 if  
there is no native IPv4, but there is a translator available and the  
translator prefix is known.

But if this is something you want you're probably better off with dual  
stack light, which is being worked upon in the softwire wg. NAT64 is  
more useful in cases where the desire to talk to the IPv4 world is  
less prominent so making the IPv4 world appear as part of the IPv6  
world is useful.


From marcelo@it.uc3m.es  Wed Apr 15 06:26:08 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] Should NATs pass ICMP Extensions transparently?
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Philip Matthews escribió:
>
>
> The Complication
> ================
> There is an individual draft (draft-atlas-icmp-unnumbered) which 
> proposes an Interface Information object that, as currently defined, 
> cannot pass through a NAT64 transparently. [The problem is that the 
> syntax of this object, as currently defined, assumes that the 
> addresses inside the Object are of the same family as the outer IP 
> header].
>
i would raise this issue to the draft-atlas authors and see why is this 
the case
i mean, bascially what this means is that this object is explicitly  non 
translatable, right?
If this is so, and it is so on purpose, the goal i guess is that we drop 
the object i guess



> This draft is currently in IESG evaluation.
>
> If this draft is published without fixing this issue, then I propose 
> that we make an exception for this Object only:    For this Object, a 
> NAT MUST either drop or translate the Object.
>
>
> The Summary
> ===========
> I think NATs SHOULD pass ICMP Extension Objects transparently, with 
> the possible exception of the (almost finalized) Interface Information 
> Object.
>
>
i would preffer to not have exceptions... what happens if we pass this 
object as the rest of them?

regards, marcelo



> Comments?
>
> - Philip
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>


From Fred.L.Templin@boeing.com  Wed Apr 15 09:54:15 2009
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From: "Templin, Fred L" 
To: "Iljitsch van Beijnum" , "Behave WG" 
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Iljitsch,

> -----Original Message-----
> From: Iljitsch van Beijnum [mailto:iljitsch@muada.com]
> Sent: Monday, April 13, 2009 8:12 AM
> To: Behave WG
> Subject: [BEHAVE] NAT64 fragmentation
>=20
> Hi all,
>=20
> here is text about fragmentation that I've been working on for the
> NAT64 draft.

Yikes; that's a lot of text - any way to compress?
It would also be easier to insert comments if the
text were in (pseudo) Internet draft form.
=20
> Comments are appreciated, especially about the choice for DF=3D0 <=3D =
1280

This seems to deviate from RFC2460 and RFC2765 behavior
wrt IPv6 path MTU underflow, and if so you must justify
exactly why. In RFC2460, hosts may receive a PTB with an
MTU smaller than 1280 from a v6/v4 translator, and are
thereafter required to insert a fragment header so that
translator can have a well-behaved ID for generating
IPv4 fragments. Why does this approach deviate?

> and DF=3D1 > 1280 byte packet sizes for IPv6->IPv4.

Enabling IPv4 path MTU discovery opens the system to
MTU-related black holing for the portion of the path
that is conveyed as IPv4. It is therefore desirable to
locate the NAT64 as close as possible to the IPv4 end
system such that the surface for ICMP spoofing and
black holing is reduced. (AFAICT, that includes
performing the translation on the end system itself.)

Fred
fred.l.templin@boeing.com

>=20
> Iljitsch
>=20
>=20
>=20
> Packet sizes
>=20
> It's the job of the network layer to adapt to different maximum packet
> sizes as packets move through the network. There are three mechanisms
> that handle this: transport layer negotiations such as the TCP MSS
> option, path MTU discovery and fragmentation. The difference between
> the IPv4 and IPv6 header sizes requires some handling in a NAT64
> translator, and there are complications because of the differences
> between how IPv4 and IPv6 handle fragmentation, as well as the issue
> of how to demultiplex fragmented IPv4 packets.
>=20
> There are two approaches to path MTU discovery and fragmentation when
> translating from IPv6 to IPv4:
>=20
> 1. Set DF to 0 in the translated packets. This avoids path MTU
> discovery issues but leads to significant numbers of fragments.
>=20
> 2. Set DF to 1 in the translated packets. This supports path MTU
> discovery on the IPv4 side so unnecessary fragments are avoided, but
> it doesn't address the issue that IPv6 hosts are not required to
> perform PMTUD when sending packets of 1280 bytes or smaller.
>=20
> The choice made in this document is to support option 1 for packets
> upto 1280 bytes, and option 2 for packets larger than 1280 bytes.
>=20
> A NAT64 translator MUST have an MTU of at least 1280 on all of its
> interfaces, both IPv4 and IPv6 interfaces.
>=20
> TCP MSS option
>=20
> The TCP MSS option [RFC 793] is used during the three-way handshake by
> the two hosts involved to inform each other about the maximum TCP
> segment size (assuming IP and TCP headers without options) that the
> host can receive.
>=20
> In practice, the MSS option is often used to make TCP work in the
> presence of broken path MTU discovery.
>=20
> To avoid unnecessary path MTU discovery cycles, a NAT64 SHOULD rewrite
> the MSS option in SYN packets to the minimum of the original MSS
> option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU on
> the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6
> direction and the IPv6-to-IPv4 direction.
>=20
> Path MTU discovery
>=20
> The vast majority of both IPv4 and IPv6 hosts use path MTU discovery
> [RFC 1191] [RFC 1981]. With IPv4, PMTUD can be enabled on a per-packet
> basis by setting the DF bit to 1. With IPv6, there is no need for
> PMTUD for packets up to 1280 bytes because all IPv6 hosts are required
> to be able to receive 1280-byte packets without fragmentation. When
> sending larger packets, IPv6 hosts implicitly use PMTUD.
>=20
> IPv6-to-IPv4
>=20
> If the NAT64 has the same MTUs on its IPv6 and IPv4 interfaces, it
> will never have to generate "packet too big" messages for incoming
> IPv6 packets because the translation from IPv6 to IPv4 reduces the
> packet size by 20 bytes, more if the IPv6 packet has extension headers
> that are removed during the translation, such as the fragment header.
> If the MTU on the IPv6 side is larger than 1280 bytes and more than 20
> bytes smaller than the MTU on the IPv4 side, the NAT64 MUST generate
> the appropriate "packet too big" messages on the IPv6 side.
>=20
> To support PMTUD, for translated packets that are larger than 1260
> bytes on the IPv4 side (1280 bytes IPv6 packets with 20 byte size
> reduction through the translation), the DF bit is set to 1 in the
> resulting IPv4 packet.
>=20
> IPv4 routers may generate "packet too big" messages indicating a
> supported MTU size smaller than 1280 bytes. In those cases, the IPv6
> hosts will continue to send packets larger than what the IPv4 path MTU
> can support. To allow packets to be delivered successfully in this
> case, the DF bit is set to 0 in all translated packets smaller than or
> equal to 1260 bytes, to allow these packets to be fragmented in the
> IPv4 network.
>=20
> Note: it is highly recommended for IPv4 hosts running services that
> may be used by IPv6 clients through a NAT64 translator to use an MTU
> size of at least 1260 bytes and to properly generate "packet too big"
> messages.
>=20
> When a NAT64 translates "packet too big" messages from IPv6 to IPv4,
> it adjusts the advertised MTU to the minimum of the original
> advertised MTU + 20, the NAT64's MTU on the IPv6 side + 20 and the
> NAT64's MTU on the IPv4 side.
>=20
> IPv4-to-IPv6
>=20
> Because it may be necessary to include a fragmentation header or other
> extension header, the NAT64 MUST be prepared to generate "packet too
> big" messages for packets with the DF bit set to 1 received from the
> IPv4 side, regardless of the MTU sizes on the IPv4 and IPv6
> interfaces. If the packet is larger than can be transmitted on the
> IPv6 side after translation, the NAT64 returns a "packet too big"
> message indicating the maximum IPv4 packet size that would be
> supported using the same translation as the current packet. This can
> be calculated as IPv4-packet-size - (IPv6-packet-size - IPv6-total-
> length) + 20.
>=20
> When a NAT64 translates "packet too big" messages from IPv4 to IPv6,
> it adjusts the advertised MTU to the minimum of the original
> advertised MTU - 20, the NAT64's MTU on the IPv6 side and the NAT64's
> MTU on the IPv4 side - 20. However, if the advertised MTU in "packet
> too big" messages is smaller than 1260 bytes, the value put into the
> translated "packet too big" message is 1280. This makes sure that the
> IPv6 host will limit its packet sizes to 1280 bytes, so its packets
> are subsequently translated into IPv4 packets with DF set to 0. (This
> deviates from [RFC 2765].)
>=20
> Fragmentation
>=20
> Because NAT deviates from normal router behavior, the limitation that
> IPv6 packets or IPv4 packets with DF set to 1 are not fragmented by
> routers doesn't apply to a NAT64 translator. Where appropriate, these
> packets are fragmented after translation as described below.
>=20
> Demultiplexing
>=20
> Because NAT64 provides a stateful many-to-one (perhaps even many-to-
> many) translation, it is necessary to recognize which session a given
> packet belongs to. For this, the TCP or UDP port numbers must be
> known, but these only occur in the first fragment of a fragmented
> packet. There are two possible ways to deal with this:
>=20
> 1. Reassemble the packet before translating it.
>=20
> 2. Create translation state for the fragments belonging to the same
> packet so each packet can be translated.
>=20
> Strategy 2 is attractive in large installations because it requires
> less storage and processing. However, it may still be necessary to
> buffer fragments for some time, as the fragment containing the first
> part of the packet (and with that, the port numbers) may not be the
> first one to arrive.
>=20
> Note: based on the assumptions that hosts generate fragments in-order
> and that reordering must happen through parallel network links and
> that the path between these parallel links and a NAT64 supports speeds
> of at least 10 Mbps, there is a very high probability that two out-of-
> order fragments making up a packet will arrive at the NAT64 within 50
> to 100 milliseconds. Further assuming that fragmented traffic makes up
> less than 10% of all traffic, this only requires a buffer of 6 to
> 12,500 fragments (50 ms at 10 Mbps to 100 ms at 10 Gbps).
>=20
> In some cases, especially in the IPv6-to-IPv4 direction, there may
> only be a single session matching the fragment's source and
> destination addresses and protocol number. In these cases, it would be
> possible to translate the fragments out-of-order. A NAT64 translator
> MAY do this for TCP, however, it MUST NOT translate UDP packets before
> the first fragment is available. The reason for this is that the
> fragment could be part of a packet setting up a new session. However,
> with TCP session establishment packets don't carry data, so it's
> extremely unlikely that they are fragmented. This is not the case with
> UDP, and in the IPv4-to-IPv6 direction, a UDP packet may have a zero
> checksum, which must be recalculated when translating to IPv6, for
> which the entire packet must be available.
>=20
> IPv6-to-IPv4
>=20
> For all IPv4 packets that the NAT64 creates through translation, the
> translator generates an ID value. This applies to all packets,
> regardless of their size or the value of the DF field. A NAT64
> translator MAY employ strategies to avoid reusing an ID value for a
> certain source, destination, protocol tuple as long as possible. If
> the IPv4 packets are fragments of an IPv6 packet, then state is
> created that makes it possible for all the fragments to have the same
> ID value on the IPv4 side.
>=20
> [RFC 2765] specifies copying the lower bits from the IPv6 ID field in
> a fragment header (if present) to the IPv4 ID field, but this runs the
> risk of two IPv6 hosts talking to the same IPv4 destination through
> the NAT64 using the same ID value.
>=20
> Otherwise, when translating IPv6 packets with a fragmentation header,
> the fragments are translated as per [RFC 2765].
>=20
> IPv4-to-IPv6
>=20
> Because packets coming in on the IPv4 side may be larger than 1280
> bytes after translation, a NAT64 MUST implement PMTUD on the IPv6
> side. In other words, it must react to "packet too big" messages for
> any IPv6 destination that it communicates with by limiting the size of
> the packets that it sends to the advertised maximum.
>=20
> In the case where, after translation from IPv4 to IPv6, a packet is
> larger than a destination's PMTU, the NAT64 returns a "packet too big"
> as outlined earlier in the case that the DF bit was set to 1 in the
> IPv4 packet. If the DF bit was set to 0, the translator first
> translates the IPv4 packet, and then fragments the resulting IPv6
> packets using normal IPv6 fragmentation rules. The value in the ID
> field is generated locally by the NAT64. If the IPv4 packet was a
> fragment, state is created that allows the same ID value to be used
> for all IPv6 packets or fragments that are part of the same original
> IPv4 packet.
>=20
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From iljitsch@muada.com  Wed Apr 15 10:53:35 2009
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To: "Templin, Fred L" 
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Hi Fred,

Thanks for the comments.

On 15 apr 2009, at 18:55, Templin, Fred L wrote:

>> here is text about fragmentation that I've been working on for the
>> NAT64 draft.

> Yikes; that's a lot of text - any way to compress?

Sure, gzip or bzip2?  :-)

> It would also be easier to insert comments if the
> text were in (pseudo) Internet draft form.

It was supposed to be, just need to drop in the XML, but I want the  
text to be close to final before I start with that.

>> Comments are appreciated, especially about the choice for DF=0 <=  
>> 1280

> This seems to deviate from RFC2460 and RFC2765 behavior
> wrt IPv6 path MTU underflow,

Not sure what you're getting at with regard to RFC 2460 (the IPv6  
spec, for IPv4-only BEHAVErs), but you're right about RFC 2765. This  
specifies:

(PTB = packet too big)

> exactly why. In RFC2460, hosts may receive a PTB with an
> MTU smaller than 1280 from a v6/v4 translator, and are
> thereafter required to insert a fragment header so that
> translator can have a well-behaved ID for generating
> IPv4 fragments. Why does this approach deviate?

This seemed unnecessarily complex to me, just setting DF=0 on <= 1280  
byte packets and DF=1 on larger packets is simpler. So I asked Erik  
Nordmark, author of RFC 2765, about this and he explained that SIIT  
does this because it's stateless, so different fragments may flow  
through different translators, so it's important that the source host  
puts the ID value in packets. I think there is a slight issue here,  
but that's not important here, as in the _stateful_ translation we  
require that all packets flow through the same translator in any event.

Additionally, there is actually a risk if we use the ID generated by  
the IPv6 hosts: suppose that two hosts both talk to google.com and  
they both choose ID 0xdead. Suppose the normal large first fragment /  
small second and last fragment case. Google could then easily  
reassemble a packet from fragment 1 from host A and fragment 2 from  
host B. This case becomes less of a corner case when there is a loss:  
if fragment 2 from host A is lost, and host B sends (for instance) 130  
packets during the time between when host A sends fragment 1 and it  
retransmits fragment 2, there is a one in 500 chance that the ID  
fields will clash.

That's why I want the translator to generate new ID values for all  
IPv4 packets.

>> and DF=1 > 1280 byte packet sizes for IPv6->IPv4.

> Enabling IPv4 path MTU discovery opens the system to
> MTU-related black holing for the portion of the path
> that is conveyed as IPv4.

Is it a goal to make PMTUD for NAT64 better than for untranslated  
IPv4? If there's a black hole, you're going to have trouble regardless  
of the translation.

We can of course set DF=0 for all packets but then, pretty much nobody  
does that for IPv4 today, even people who filter incoming ICMP, like  
microsoft.com.

> It is therefore desirable to
> locate the NAT64 as close as possible to the IPv4 end
> system such that the surface for ICMP spoofing and
> black holing is reduced. (AFAICT, that includes
> performing the translation on the end system itself.)

Unfortunately, the translation that we're talking about here happens  
fairly close to the IPv6 hosts = far from the IPv4 host.

From philip_matthews@magma.ca  Wed Apr 15 13:43:46 2009
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On Mon, 13-Apr-09, at 11:12 , Iljitsch van Beijnum wrote:

> Hi all,
>
> here is text about fragmentation that I've been working on for the  
> NAT64 draft.
>
> Comments are appreciated, especially about the choice for DF=0 <=  
> 1280 and DF=1 > 1280 byte packet sizes for IPv6->IPv4.

Iljitsch:

Under your proposal, what would happen if a NAT64 receives an IPv6  
packet with the Fragmentation Header?

- Philip


From dwing@cisco.com  Wed Apr 15 13:56:05 2009
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From: "Dan Wing" 
To: "'Philip Matthews'" 
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Subject: Re: [BEHAVE] NAT64 fragmentation
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> > Lots of your text seems redundant with draft-baker-behave-v4v6- 
> > translation-02
> 
> 
> Let me propose that we begin by figuring out how we want to handle  
> fragmentation. We can then work out how to divide the text amongst  
> documents.

Sure.  But they don't align.  I don't know if that is intentional
or accidental.  If intentional it would be helpful to call it 
out rather than relying on everyone to analyze the differences --
that is wasted effort.

-d


From philip_matthews@magma.ca  Wed Apr 15 14:10:31 2009
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Subject: Re: [BEHAVE] NAT64 fragmentation
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On Mon, 13-Apr-09, at 19:33 , Dan Wing wrote:
>
> Lots of your text seems redundant with draft-baker-behave-v4v6- 
> translation-02


Let me propose that we begin by figuring out how we want to handle  
fragmentation. We can then work out how to divide the text amongst  
documents.

- Philip


From iljitsch@muada.com  Wed Apr 15 14:25:00 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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On 15 apr 2009, at 15:10, Philip Matthews wrote:

> Under your proposal, what would happen if a NAT64 receives an IPv6  
> packet with the Fragmentation Header?

This is what I wrote:

> [RFC 2765] specifies copying the lower bits from the IPv6 ID field  
> in a fragment header (if present) to the IPv4 ID field, but this  
> runs the risk of two IPv6 hosts talking to the same IPv4 destination  
> through the NAT64 using the same ID value.

> Otherwise, when translating IPv6 packets with a fragmentation  
> header, the fragments are translated as per [RFC 2765].


And before that:

> In some cases, especially in the IPv6-to-IPv4 direction, there may  
> only be a single session matching the fragment's source and  
> destination addresses and protocol number. In these cases, it would  
> be possible to translate the fragments out-of-order. A NAT64  
> translator MAY do this for TCP, however, it MUST NOT translate UDP  
> packets before the first fragment is available.


I made a mistake here: in the IPv6-to-IPv4 direction, there are no  
demultiplexing or UDP checksum issues so fragments can be translated  
individually, as long as we make sure that there are no issues with  
the ID field.

A reasonably robust but annoyingly complex way to handle the IDs:

For each IPv4 destination address, all unfragmented packets and each  
IPv6 source of fragmented packets needs ID space. Obtain this space in  
blocks, for instance of 256. For unfragmented packets, simply cycle  
through the block. For fragmented packets, copy the low order bits of  
the IPv6 ID in the low order bits of the IPv4 ID and the block number  
in the high order bits of the IPv4 ID. Count first fragments so we  
know when 256 ID numbers are used. Whenever a block is used up, get a  
new one in least recently used fashion. I guess the block size could  
be made dynamic for more efficiency with few fragment sources but  
support for a large number of fragment sources when required.

Or perhaps it makes sense to just ignore the issue, and write the  
lower 15 bits of the IPv6 ID in the IPv4 ID with the high bit 0 for  
IPv6 fragments and generate a 15-bit ID with the high bit 1 for  
unfragmented IPv6 packets. This WILL lead to incorrect reassembly when  
the number of fragment sources and number of fragments per second  
increases and in 1/65535th of those cases that will go undetected and  
lead to data corruption, but maybe we'll have to live with that if we  
want to have fast translators.

Thoughts?

From xuxh@huawei.com  Wed Apr 15 19:40:31 2009
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Date: Thu, 16 Apr 2009 10:41:31 +0800
From: Xu Xiaohu 
In-reply-to: <49E5A003.4090305@it.uc3m.es>
To: 'marcelo bagnulo braun' 
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> > IMHO, keeping the established session uninterrupted during 
> the switchover of
> > NAT64 boxes should be desired, but not required.
> >   
> 
> makes sense
> so, this basically means that in the base NAT64 spec we don't provide 
> this feature, but another draft can provide it

The requirement of fault tolerance depends heavily on the serving scope of
the NAT64 box. If the NAT64 box is serving a huge amount of IPv6 hosts, the
hot standby mechanism should be strongly desired.

> > Both option 4 and 5 are not acceptable since they require 
> IPv6 hosts to
> > determine the availability of the prefix64, IMO.
> >   
> 
> Not really
> Option 5 would actually be compliant with current host behaviour i.e. 
> does not need changes to current hosts
> Option 5 basically works as follows. The DNS64 returns two 
> AAAA RR with 
> different prefixes on it. the host will try with the first one. If 
> doesn't work it will try with the second one. This is exactly 
> what hosts 
> do today when they receive multiple RR for a DNS query.

If the session (e.g. TCP connection) over the first one was established
successfully and later interrupted due to the failure of the first one,
will the session automatically try the second one? I'm not sure whether this
feature can be supported by all current applications. Could anyone
expertised in this field confirm it?


> > Why should the NAT64 box keep track of which IPv6 source 
> address is using
> > which Prefix64, Could you explain more? 
> >
> >   
> because when it receives packets in the reverse direction, it 
> needs to 
> know which prefix to use in IPv6 packet (as a source prefix)
> when the NAT64 box can use more than one prefix, then it 
> needs to keep 
> track of which prefix has used for every flow it is 
> processing. this is 
> considerable additional complexity imho and i am not sure it is worth 
> the advantages.

If one IPv6 host uses only one prefix64 for all connections, that's not a
big problem. However, if the IPv6 host (e.g. attacker) is allowed to use
different prefix64 for different connection, that will become a nightmare
since the NAT64 will need to maintain one state per connection.

Xiaohu



From xuxh@huawei.com  Wed Apr 15 19:56:49 2009
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Date: Thu, 16 Apr 2009 10:57:46 +0800
From: Xu Xiaohu 
In-reply-to: <49E5A171.90007@it.uc3m.es>
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=20

> -----=D3=CA=BC=FE=D4=AD=BC=FE-----
> =B7=A2=BC=FE=C8=CB: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]=20
> =B7=A2=CB=CD=CA=B1=BC=E4: 2009=C4=EA4=D4=C215=C8=D5 16:57
> =CA=D5=BC=FE=C8=CB: Xu Xiaohu
> =B3=AD=CB=CD: 'Joel Jaeggli'; 'Behave WG'
> =D6=F7=CC=E2: Re: [BEHAVE] trade-offs handling multiple state-full =
v4v6=20
> translators
>=20
> Xu Xiaohu escribi=A8=AE:
> >>> IMHO, keeping the established session uninterrupted during the=20
> >>> switchover of
> >>> NAT64 boxes should be desired, but not required.
> >>>      =20
> >> If it's invisble to the host stack's on either end then no=20
> big deal,=20
> >> if it requires that one or the other of them change that=20
> clearly has=20
> >> implications for cases in which it can be deployed.
> >>
> >> If they were deployed with some vrrp like equivalence then it's up=20
> >> the the implementation to mirror state between the two boxes.
> >>    =20
> >
> > I fully agree. In fact, we can extend the option 5 by running some=20
> > VRRP like keepalive mechanism on two NAT64 boxes and=20
> selecting one as=20
> > primary NAT64 for group A (prefix64-A and IPv4 Pool A)and=20
> secondary =20
> > NAT64 for group B (prefix64-B, and IPv4 Pool B),  another one as=20
> > primary  NAT64 for group B and secondary NAT64 for group A, the=20
> > primary NAT64 for group A (or group B) will advertise the route to=20
> > that prefix64-A (or prefix64-B)on IPv6 side and the route=20
> to IPv4 pool=20
> > A (or IPv4 Pool B) on IPv4 side , while the secondary one=20
> can either not advertise those routes or advertise them with=20
> high cost.
> > Besides, the primary and the secondary could synchronize=20
> the mapping info.
> > In this way, we could achieve hot standby NAT64.
> >  =20
>=20
> I think you are mixing the two problems here the options=20
> presented above are only for establishing new connection If=20
> you want to preserve estbalished connection, itis a=20
> completelly different problem and i would suggest we keep=20
> them separated.

Yes, the options you mentioned are about cold standby, while the above
approach I mentioned is about  hot standby.=20

Xiaohu


From dwing@cisco.com  Wed Apr 15 21:31:54 2009
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Cc: 'Dave Thaler' 
Subject: [BEHAVE] interim BEHAVE meeting on 6/4 translation
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A virtual interim meeting for BEHAVE may be useful.

I propose a two hour meeting on Wednesday, May 20th at 7am Pacific Daylight
Time (-0700).  If this time poses a significant conflict please reply to
behave-chairs@tools.ietf.org.  Dialin conference bridge and screen sharing
will be arranged.

The agenda would include items such as:

  * 6/4 translation document organization
  * 6/4 translation on a host
  * IP fragmentation across a 6/4 translator
  * TCP MSS across a 6/4 translator

Please suggest additional agenda items.

-d


From dwing@cisco.com  Thu Apr 16 01:32:12 2009
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From: "Dan Wing" 
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Date: Thu, 16 Apr 2009 01:32:47 -0700
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Subject: [BEHAVE] FW: draft-ietf-v6ops-cpe-simple-security-04 WGLC
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This V6OPS document echos requirements from RFC5382 (TCP) and RFC4787 (UDP)
and may be interesting to BEHAVE.  Please send comments to V6OPS or the
authors, as appropriate.

-d


-----Original Message-----
From: owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On Behalf Of
Fred Baker
Sent: Wednesday, April 15, 2009 8:27 AM
To: IPv6 Operations
Cc: kurtis@kurtis.pp.se; rbonica@juniper.net
Subject: draft-ietf-v6ops-cpe-simple-security-04 WGLC

This is to initiate a two week working group last call of draft-ietf- 
v6ops-cpe-simple-security-04. Please read it now. If you find nits  
(spelling errors, minor suggested wording changes, etc), comment to  
the authors; if you find greater issues, such as disagreeing with a  
statement or finding additional issues that need to be addressed,  
please post your comments to the list.

We are looking specifically for comments on the importance of the  
document as well as its content. If you have read the document and  
believe it to be of operational utility, that is also an important  
comment to make.


From iljitsch@muada.com  Thu Apr 16 02:11:56 2009
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On 15 apr 2009, at 22:57, Dan Wing wrote:

If intentional it would be helpful to call it
out rather than relying on everyone to analyze the differences --
that is wasted effort.

Ok, here are the differences between draft-baker-behave-v4v6- 
translation-02 and my text that I sent to the list a few days aog  
relevant to packet size and fragmentation issues that I found:

trans02 says:

    Fragmented IPv4 UDP packets that do not contain a UDP checksum (i.e.
    the UDP checksum field is zero) are not of significant use over  
wide-
    areas in the Internet and will not be translated by the IP/ICMP
    translator [Miller].

our text says to compute a checksum. This is also what the SIIT RFC  
specifies. Unfortunately, the reference is very old and not specific  
enough to retrieve.

trans02:

    One of the differences between IPv4 and IPv6 is that in IPv6 path  
MTU
    discovery is mandatory but it is optional in IPv4.

This isn't entirely correct. RFC 1981 says:

    IPv6 nodes SHOULD implement Path MTU Discovery in order to discover
    and take advantage of paths with PMTU greater than the IPv6 minimum
    link MTU [IPv6-SPEC].  A minimal IPv6 implementation (e.g., in a  
boot
    ROM) may choose to omit implementation of Path MTU Discovery.

    Nodes not implementing Path MTU Discovery use the IPv6 minimum link
    MTU defined in [IPv6-SPEC] as the maximum packet size.

trans02:

    When the IPv4 node performs path MTU discovery (by setting the DF  
bit
    in the header) the path MTU discovery can operate end-to-end i.e.
    across the translator.  In this case either IPv4 or IPv6 routers
    might send back ICMP "packet too big" messages to the sender.  When
    these ICMP errors are sent by the IPv6 routers they will pass  
through
    a translator which will translate the ICMP error to a form that the
    IPv4 sender can understand. In this case an IPv6 fragment header is
    only included if the IPv4 packet is already fragmented.

This doesn't address the situation where the IPv4 packet is translated  
into an IPv6 packet that is too large to forward without fragmentation  
like we do.

trans02:

    However, when the IPv4 sender does not perform path MTU discovery  
the
    translator has to ensure that the packet does not exceed the path  
MTU
    on the IPv6 side.  This is done by fragmenting the IPv4 packet so
    that it fits in 1280 byte IPv6 packet

In our text this is done differently: the translator performs PMTUD on  
the IPv6 side and only fragments the IPv6 packet if the IPv6  
destination's PMTU requires it. Note that in the trans02 case this  
would create a relatively large number of IPv6 fragments, depending on  
how much traffic is >1280 and DF=0. For TCP this should be rare but  
for video streaming over UDP this would be the common case.

trans02:

    Also, when the IPv4 sender
    does not perform path MTU discovery the translator MUST always
    include an IPv6 fragment header to indicate that the sender allows
    fragmentation.  That is needed should the packet pass through an IP/
    ICMP translator.

This isn't done in our text.

    In addition, the rules use the presence of an
    IPv6 fragment header to indicate that the sender might not be using
    path MTU discovery i.e. the packet should not have the DF flag set
    should it later be translated back to IPv4.

Our requirement that the translator perform PMTUD on the IPv6 side  
means that this isn't an issue for us.

trans02:

    If the DF flag is not set and the IPv4 packet will result in an IPv6
    packet larger than 1280 bytes the IPv4 packet MUST be fragmented
    prior to translating it.

Doesn't it make more sense to translate first and then fragment?  
(That's what we specify.) But I guess implementers can decide this  
issue for themselves as long as the end result is the same.

trans02:

    When a translator receives the first fragment of a fragmented UDP
    IPv4 packet and the checksum field is zero the translator SHOULD  
drop
    the packet and generate a system management event specifying at  
least
    the IP addresses and port numbers in the packet.  When it receives
    fragments other than the first it SHOULD silently drop the packet,
    since there is no port information to log.

It's not clear whether the last sentence is meant to only apply to the  
checksum=0 case. In that case, state would have to be maintained to  
recognize additional fragments. If not, then UDP fragments won't work  
because non-first fragments are consistently dropped so the  
destination can never reassemble.

There is also no specification of what happens when fragments arrive  
out-of-order.

trans02:

                Code 4 (fragmentation needed and DF set):  Translate  
to an
                ICMPv6 Packet Too Big message (Type 2) with code 0.  The
                MTU field needs to be adjusted for the difference  
between
                the IPv4 and IPv6 header sizes.  Note that if the IPv4
                router did not set the MTU field i.e. the router does  
not
                implement [RFC1191], then the translator must use the
                plateau values specified in [RFC1191] to determine a
                likely path MTU and include that path MTU in the ICMPv6
                packet.  (Use the greatest plateau value that is less
                than the returned Total Length field.)

Our text also specifies taking the translator's MTUs into account when  
adjusting the MTU difference.

We don't handle the case where no MTU value is returned. Since RFC  
1191 was published 18 years ago and PMTUD is as good as ubiquitous, do  
we need to support this case?

The text in trans02 about PMTUD and fragmentation starting at the top  
of page 15 suggests that PMTUD for UDP can't find the optimal packet  
size. However, this doesn't account for the differences between an  
IPv4 MTU of 1260 or smaller vs one that's bigger. In the latter case,  
PMTUD can work without any issues. (Note that PMTUD for UDP generally  
doesn't work with IPv4 because it must be handled by the transport  
protocol = effectively the application in IPv4, rather than the IP  
layer, like in IPv6.)

What about TCP? Can we assume that TCP fragments never happen with IPv6?

trans02:

    Identification:  All zero.

I have personally set up a system to fragment packets with DF=1 anyway  
way back when in my sordid past. It would be better if packets have a  
valid ID field even with DF=1.

trans02 (for unfragmented IPv6 packets):

       Flags:  The More Fragments flag is set to zero.  The Don't  
Fragments
       flag is set to one.

Note the difference with our text that specifies DF=0 for <= 1280 and  
DF=1 for > 1280 byte packets.

trans02, now talking about IPv6 packets with a fragment header:

       Identification:  Copied from the low-order 16-bits in the
       Identification field in the Fragment header.

See my message from yesterday about the issues with clashing ID values  
from different IPv6 hosts in the case of copying the ID bits from IPv6  
to IPv4. Also note that because of the way PMTUD is handled, there  
will be much more IPv6 packets with a fragment header so this issue  
will be more significant. In our solution, in many cases the  
translator will generate the ID because the IPv6 packet doesn't have a  
fragment header.

Additional issues that our text discusses:

"A NAT64 translator MUST have an MTU of at least 1280 on all of its  
interfaces, both IPv4 and IPv6 interfaces."

"To avoid unnecessary path MTU discovery cycles, a NAT64 SHOULD  
rewrite the MSS option in SYN packets to the minimum of the original  
MSS option, the NAT64's MTU on the IPv6 side - 60 and the NAT64's MTU  
on the IPv4 side - 40. This applies to SYNs in both the IPv4-to-IPv6  
direction and the IPv6-to-IPv4 direction."

Discussion of out-of-order fragment handling.


From iljitsch@muada.com  Thu Apr 16 02:38:08 2009
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Subject: Re: [BEHAVE] interim BEHAVE meeting on 6/4 translation
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On 16 apr 2009, at 6:33, Dan Wing wrote:

> I propose a two hour meeting on Wednesday, May 20th at 7am Pacific  
> Daylight
> Time (-0700).  If this time poses a significant conflict please  
> reply to
> behave-chairs@tools.ietf.org.  Dialin conference bridge and screen  
> sharing
> will be arranged.

>  * IP fragmentation across a 6/4 translator
>  * TCP MSS across a 6/4 translator

Hm, do we really want to wait more than a month before hammering this  
out? I'd say either schedule a virtual meeting for next week or do  
this through email.

There are a few choices to be made with regard to fragmentation  
handling but I don't think those are hugely controversial, so we  
should be able to come to rough consensus if we can find a quorum of  
people who care enough to form an opinion...

From iljitsch@muada.com  Thu Apr 16 02:44:16 2009
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Cc: Xing Li , Behave WG , Fred Baker , Hiroshi MIYATA 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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On 15 apr 2009, at 5:02, Brian E Carpenter wrote:

> At least two bad things happen with 6to4 if the WKP is incorrectly
> advertised or filtered.

> 1. 2002::/16 is advertised too far - that is to say, A advertises it  
> to B,
> but the relay that A is operating has an ACL that drops IPv6 packets  
> from
> outside A. Users sending native IPv6 packets to a 6to4 destination  
> via B
> will be sending them into a black hole. In this case, A was wrong to
> export the prefix.

> 2. 2002::/16 is advertised too short - that is to say, A advertises  
> it to B,
> *and* is willing to relay IPv6 packets from B, but B drops the  
> route. Users
> sending native IPv6 packets to a 6to4 destination via B will get  
> Destination
> Unreachable. In this case, B was wrong to filter the prefix.

> Actually, the correct solution is that every ISP offering native  
> IPv6 service
> MUST either operate an inbound (to 6to4) relay or support a  
> 2002::/16 route
> to such a relay, and MUST NOT advertise such a route to other ISPs  
> unless
> it is willing to accept all traffic.

> I'm sure similar problems would arise with a NAT64 WKP, if used  
> carelessly.
> But I think Xing Li's analysis a few days ago was correct.

The big difference between the 6to4 prefix and a NAT64 well-known  
prefix would be that the presence of 2002::/16 in the routing tables  
throughout the internet in some way is assumed, and trouble arises  
when this prefix can't be reached. With NAT64 there is no assumption  
(yet?) that each IPv6 host can blindly assume the NAT64 exists.

Also, with 2002::/16 the prefix is advertised globally by a good  
number of people. With the NAT64 WKP this would presumably not happen,  
and advertising it between ASes at all should probably be rare.  
Basically, 2002::/16 has global scope but the NAT64 WKP would have ULA- 
like scope: some exceptions are possible, but site scope is assumed.

From dwing@cisco.com  Thu Apr 16 03:07:48 2009
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From: "Dan Wing" 
To: "'Iljitsch van Beijnum'" 
References: <083101c9be4c$6fcdccc0$c5f0200a@cisco.com> <3CFA7C27-FCB4-4D24-9144-759CF6109661@muada.com>
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Cc: 'Behave WG' , 'Dave Thaler' 
Subject: Re: [BEHAVE] interim BEHAVE meeting on 6/4 translation
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> On 16 apr 2009, at 6:33, Dan Wing wrote:
> 
> > I propose a two hour meeting on Wednesday, May 20th at 7am Pacific  
> > Daylight
> > Time (-0700).  If this time poses a significant conflict please  
> > reply to
> > behave-chairs@tools.ietf.org.  Dialin conference bridge and screen  
> > sharing
> > will be arranged.
> 
> >  * IP fragmentation across a 6/4 translator
> >  * TCP MSS across a 6/4 translator
> 
> Hm, do we really want to wait more than a month before 
> hammering this out? I'd say either schedule a virtual meeting 
> for next week or do this through email.

Per http://www.ietf.org/IESG/STATEMENTS/Interim-meetings.txt interim meetings
have to be announced four weeks prior to the meeting.

If we can resolve the proposed agenda items before the meeting, that's great!
But I expect we can find other agenda items.  If we don't need the meeting it
is easy to cancel:  nobody is out of pocket for hotel or airfare.

Based on our crowded schedule in San Francisco the group could utilize an
interim meeting.

> There are a few choices to be made with regard to fragmentation  
> handling but I don't think those are hugely controversial, so we  
> should be able to come to rough consensus if we can find a quorum of  
> people who care enough to form an opinion...

Sure.  I'm not picking on fragmentation - I mostly wanted to get a few ideas
on an agenda for a month away.


I might propose 'prefix for Scenario 1' as a replacement agenda item.  It
still feels unresolved.

-d


From pierre.levis@orange-ftgroup.com  Thu Apr 16 05:16:38 2009
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Thread-Topic: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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References:  <01C41FE7-338B-4C26-BE6A-AD0119404276@cisco.com> <49DC7354.8070305@free.fr> <7E8115D0-C412-4A5F-9281-1C5C97868152@cisco.com> <49DF5476.5030306@free.fr>
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To: , 
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Cc: behave@ietf.org, xing@cernet.edu.cn
Subject: Re: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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To summarize this thread:

Issue: In v4v6 addresses (v4 address embedded into v6 address), the v4 =
address may straddle the 64-bit boundary
Do we have to worry about the conformity to Modified EUI-64 format? In =
particular the so-called UG bits?

We can take care of the UG bits, stuffing a byte after the first 64-bit =
part, the v4v6 address will then be:

The prefix to route is:  which looks queer but should work

If we do not care of the UG bits, we lose the possibility of recognizing =
a certain class of addresses just by looking at the interface =
identifier.=20
However, no use today.

If we look at RFC4291, we see that even if v4v6 addresses are indeed =
unicast addresses, they are not really in the scope, this 64-bit =
boundary does not really make sense here:
"Interface identifiers in IPv6 unicast addresses are used to identify =
interfaces on a link. They are required to be unique within a subnet =
prefix."
"For all unicast addresses, except those that start with the binary =
value 000, Interface IDs are required to be 64 bits long and to be =
constructed in Modified EUI-64 format."

Thus, extension of prefixes beyond /64 can be done freely, without
concern with a rule for links where subnet prefixes are /64.

So, I tend to agree that for v4v6 addresses we should not care of this =
Modified EUI-64 format.

Pierre





-----Message d'origine-----
De : R=E9mi Despr=E9s [mailto:remi.despres@free.fr]=20
Envoy=E9 : vendredi 10 avril 2009 16:15
=C0 : Fred Baker
Cc : LEVIS Pierre RD-CORE-CAE; Xing Li; Behave WG
Objet : Re: [BEHAVE] Question on embedded address format in =
draft-baker-behave-v4v6-framework-02

Fred Baker  -  le (m/j/a) 4/8/09 7:28 PM:
> Let me restate what I think you said in my words. If I get it wrong, I =

> missed you.
>=20
> I think you are arguing that an IPv6 address is first and foremost a=20
> CIDR address - routers have some knowledge of prefix lengths due to=20
> their advertisement in routing protocols,
In routers that have no direct interface with source or destination
links, an IPv6 address is processed according to the CIDR logic, yes.

(*) In routers that have direct interfaces to source or destination =
links,
there are two cases:
(A) If the address space on the link is global, the rule 64-bit-IID rule
applies to global addresses.
(B) If global packets are locally encapsulated, this rule doesn't need
to apply to global addresses.

> and hosts on a LAN know=20
> something about the local LAN's prefix length because if the =
assumptions=20
> built into the handling of an address

With RS and RAs, exchanged in the link-local address space, hosts know
link subnet prefix lengths independently of their global addresses.

> - SLAAC Really Wants the prefix to=20
> be a /64,

For IIDs that are modified EUI-64, a /64 prefix is indeed needed.

(**) But, unless I miss something, this constraint could be relaxed for=20
local scope IIDs if found useful for some new function.

> ... So apart from CIDR rules and SLAAC assumptions in=20
> address prefixes governed by SLAAC, nobody should make any =
assumptions.

No assumption on formats in fields that are not processed locally.

>=20
> Did I get that right?

I think so.

Points (*) and (**) go beyond what was said previously.

Regards,

RD


>=20
> On Apr 8, 2009, at 2:50 AM, R=E9mi Despr=E9s wrote:
>=20
>> Fred Baker  -  le (m/j/a) 4/7/09 6:33 PM:
>>> On Apr 2, 2009, at 11:50 PM, =20
>>>  wrote:
>>>> Do we have to address the conformity to Modified EUI-64 format for=20
>>>> v4v6 addresses? In particular the so-called UG bits? In that case,=20
>>>> is it still possible to have an IPv4 embedded address that crosses=20
>>>> the 64bit boundary? If we do not care, why does Teredo (which=20
>>>> includes two IPv4 addresses) care?
>>> The CERNET prototype hasn't had any issues with ignoring them.
>>
>>> Other thoughts?
>>
>> If I understand it right, distinguishing between EUI-64 and=20
>> local-scope identifiers IS necessary where subnet prefixes are /64,=20
>> but ONLY in this case.
>>
>> A node outside a destination subnet is not expected to make any
>> assumption on the length of this subnet prefix.
>>
>> Thus, extension of prefixes beyond /64 can be done freely, without
>> concern with a rule for links where subnet prefixes are /64.
>>
>> As a matter of fact, this reasoning has been important to=20
>> significantly simplify draft-despres-sam-xx between versions 01 and =
02.
>>
>> Regards,
>>
>> RD
>>
>>
>=20
>=20




From magnus.westerlund@ericsson.com  Thu Apr 16 05:45:14 2009
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Cc: 'Behave WG' , 'Dave Thaler' 
Subject: Re: [BEHAVE] interim BEHAVE meeting on 6/4 translation
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Dan Wing skrev:
> 
> Per http://www.ietf.org/IESG/STATEMENTS/Interim-meetings.txt interim meetings
> have to be announced four weeks prior to the meeting.

Correction, virtual ones like telephone conferences only need to be
announced 2 weeks ahead.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  +46 10 7148287
Färögatan 6                | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------

From dwing@cisco.com  Thu Apr 16 07:27:30 2009
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From: "Dan Wing" 
To: "'Magnus Westerlund'" 
References: <083101c9be4c$6fcdccc0$c5f0200a@cisco.com>	<3CFA7C27-FCB4-4D24-9144-759CF6109661@muada.com><08e801c9be7b$5d14aa20$c5f0200a@cisco.com> <49E72012.2000500@ericsson.com>
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Cc: 'Behave WG' , 'Dave Thaler' 
Subject: Re: [BEHAVE] interim BEHAVE meeting on 6/4 translation
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Thanks for the correction.  I read it yesterday and thought only
small design teams needed that two week notice.

-d


> -----Original Message-----
> From: behave-bounces@ietf.org=20
> [mailto:behave-bounces@ietf.org] On Behalf Of Magnus Westerlund
> Sent: Thursday, April 16, 2009 5:10 AM
> To: Dan Wing
> Cc: 'Behave WG'; 'Dave Thaler'
> Subject: Re: [BEHAVE] interim BEHAVE meeting on 6/4 translation
>=20
> Dan Wing skrev:
> >=20
> > Per=20
> http://www.ietf.org/IESG/STATEMENTS/Interim-meetings.txt=20
> interim meetings
> > have to be announced four weeks prior to the meeting.
>=20
> Correction, virtual ones like telephone conferences only need to be
> announced 2 weeks ahead.
>=20
> Cheers
>=20
> Magnus Westerlund
>=20
> IETF Transport Area Director & TSVWG Chair
> ----------------------------------------------------------------------
> Multimedia Technologies, Ericsson Research EAB/TVM
> ----------------------------------------------------------------------
> Ericsson AB                | Phone  +46 10 7148287
> F=E4r=F6gatan 6                | Mobile +46 73 0949079
> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
> ----------------------------------------------------------------------
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From Adrian.Farrel@huawei.com  Wed Apr 15 14:30:22 2009
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Hi Philip,


> From Adrian Farrel:
>>  Comment:
>> I understand that other-then-UDP mechanisms for server-peer 
>> communications
>> will follow, but I find it confusing that the Introduction discusses 
>> client-server
>> TCP and TLS services since the client is presumably actually interested 
>> in
>> client-peer delivery. Also that Figure 1 shows a peer behind a NAT and 
>> the
>> text comments that some firewalls block UDP entirely.
>>
>> Would it be helpful to draw out more clearly what deployments and service
>> functions are not possible with the UDP-only variety of TURN? (There is
>> some discussion in section 2.4 of the security of the server-peer data 
>> being
>> the protected through encryption or similar.)
>
> I confess to being unsure what more I could say, probably because I am so
> close to this work that everything seems obvious. There were some 
> paragraphs
> about this in TURN-13, but I have reworked them a bit so they now say:
>
>
>   Since this version of TURN only supports UDP between the server and
>   the peer, it is expected that most clients will prefer to also use
>   UDP between the client and the server. That being the case, some
>   readers may wonder: Why also support TCP and TLS over TCP?
>
>   TURN supports TCP transport between the client and the server because
>   some firewalls are configured to block UDP entirely.  These firewalls
>   block UDP but not TCP in part because TCP has properties that make
>  the intention of the nodes being protected by the firewall more
>   obvious to the firewall.  For example, TCP has a three-way handshake
>   that makes in clearer that the protected node really wishes to have
>   that particular connection established, while for UDP the best the
>   firewall can do is guess which flows are desired by using filtering
>   rules.  Also, TCP has explicit connection teardown, while for UDP the
>   firewall has to use timers to guess when the flow is finished.
>
>   TURN supports TLS over TCP transport between the client and the
>   server because TLS provides additional security properties not
>   provided by TURN's default digest authentication; properties which
>   some clients may wish to take advantage of.  In particular, TLS
>   provides a way for the client to ascertain that it is talking to the
>   server that it intended to, and also provides for confidentiality of
>   TURN control messages.  TURN does not require TLS because the
>   overhead of using TLS is higher than that of digest authentication;
>   for example, using TLS likely means that most application data will
>   be doubly encrypted (once by TLS and once to ensure it is still
>   encrypted in the UDP datagram).
>
>
> Is this better?

Well, I only raised a Comment, and you have made some attempt to address it. 
So thank you, and move on.

Adrian 


From marcelo@it.uc3m.es  Thu Apr 16 09:02:33 2009
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From: marcelo bagnulo braun 
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Xu Xiaohu escribi¨®:
>>> IMHO, keeping the established session uninterrupted during 
>>>       
>> the switchover of
>>     
>>> NAT64 boxes should be desired, but not required.
>>>   
>>>       
>> makes sense
>> so, this basically means that in the base NAT64 spec we don't provide 
>> this feature, but another draft can provide it
>>     
>
> The requirement of fault tolerance depends heavily on the serving scope of
> the NAT64 box. If the NAT64 box is serving a huge amount of IPv6 hosts, the
> hot standby mechanism should be strongly desired.
>   


makes sense to me
this is not against we do this in a sperate document
>   
>>> Both option 4 and 5 are not acceptable since they require 
>>>       
>> IPv6 hosts to
>>     
>>> determine the availability of the prefix64, IMO.
>>>   
>>>       
>> Not really
>> Option 5 would actually be compliant with current host behaviour i.e. 
>> does not need changes to current hosts
>> Option 5 basically works as follows. The DNS64 returns two 
>> AAAA RR with 
>> different prefixes on it. the host will try with the first one. If 
>> doesn't work it will try with the second one. This is exactly 
>> what hosts 
>> do today when they receive multiple RR for a DNS query.
>>     
>
> If the session (e.g. TCP connection) over the first one was established
> successfully and later interrupted due to the failure of the first one,
> will the session automatically try the second one? I'm not sure whether this
> feature can be supported by all current applications. Could anyone
> expertised in this field confirm it?
>
>
>   

No, what i am saying is that for initial contact, if the first address
fails the apps should retru witht he next one as per rfc3484
Preserving a connection or inmediatelly re establishing a connection
after a failure is a different problem (that we are disucssing above)

To me the scope of the fault tolerance that makes sense to require for
the base spec is that a new connection can get estbalished after a fialure
This does not imply that a ongoing communication must be preserved or
reestablished automatically after a failure
>>> Why should the NAT64 box keep track of which IPv6 source 
>>>       
>> address is using
>>     
>>> which Prefix64, Could you explain more? 
>>>
>>>   
>>>       
>> because when it receives packets in the reverse direction, it 
>> needs to 
>> know which prefix to use in IPv6 packet (as a source prefix)
>> when the NAT64 box can use more than one prefix, then it 
>> needs to keep 
>> track of which prefix has used for every flow it is 
>> processing. this is 
>> considerable additional complexity imho and i am not sure it is worth 
>> the advantages.
>>     
>
> If one IPv6 host uses only one prefix64 for all connections, that's not a
> big problem. However, if the IPv6 host (e.g. attacker) is allowed to use
> different prefix64 for different connection, that will become a nightmare
> since the NAT64 will need to maintain one state per connection.
>
>   
that's exactly the case, if the nat64 handles more than one prefix645,
then we need to maintain the destiantion address in the binding state

Regards, marcelo


> Xiaohu
>
>
>
>   


From Fred.L.Templin@boeing.com  Thu Apr 16 09:47:12 2009
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Thread-Topic: [BEHAVE] NAT64 fragmentation
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References: <5D63E0F4-2784-4C50-833E-3A2E499DF55A@muada.com>  <39C363776A4E8C4A94691D2BD9D1C9A105D0D7EC@XCH-NW-7V2.nw.nos.boeing.com> 
From: "Templin, Fred L" 
To: "Iljitsch van Beijnum" 
X-OriginalArrivalTime: 16 Apr 2009 16:48:13.0457 (UTC) FILETIME=[21F00010:01C9BEB3]
Cc: "erik.nordmark@sun.com Nordmark" , Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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Iljitsch,

> -----Original Message-----
> From: Iljitsch van Beijnum [mailto:iljitsch@muada.com]
> Sent: Wednesday, April 15, 2009 10:54 AM
> To: Templin, Fred L
> Cc: Behave WG; erik.nordmark@sun.com Nordmark
> Subject: Re: [BEHAVE] NAT64 fragmentation
>=20
> Hi Fred,
>=20
> Thanks for the comments.
>=20
> On 15 apr 2009, at 18:55, Templin, Fred L wrote:
>=20
> >> here is text about fragmentation that I've been working on for the
> >> NAT64 draft.
>=20
> > Yikes; that's a lot of text - any way to compress?
>=20
> Sure, gzip or bzip2?  :-)
>=20
> > It would also be easier to insert comments if the
> > text were in (pseudo) Internet draft form.
>=20
> It was supposed to be, just need to drop in the XML, but I want the
> text to be close to final before I start with that.
>=20
> >> Comments are appreciated, especially about the choice for DF=3D0 =
<=3D
> >> 1280
>=20
> > This seems to deviate from RFC2460 and RFC2765 behavior
> > wrt IPv6 path MTU underflow,
>=20
> Not sure what you're getting at with regard to RFC 2460 (the IPv6
> spec, for IPv4-only BEHAVErs), but you're right about RFC 2765. This
> specifies:
>=20
> (PTB =3D packet too big)
>=20
> > exactly why. In RFC2460, hosts may receive a PTB with an
> > MTU smaller than 1280 from a v6/v4 translator, and are
> > thereafter required to insert a fragment header so that
> > translator can have a well-behaved ID for generating
> > IPv4 fragments. Why does this approach deviate?
>=20
> This seemed unnecessarily complex to me, just setting DF=3D0 on <=3D =
1280
> byte packets and DF=3D1 on larger packets is simpler. So I asked Erik
> Nordmark, author of RFC 2765, about this and he explained that SIIT
> does this because it's stateless, so different fragments may flow
> through different translators,

If the IPv6 host fragments a packet into multiple IPv6
fragments before sending, then for the reasons you
mentioned the translators must honor the ID which the
IPv6 host supplies (else, fragments of the same packet
flowing through different translators would not be
reassembled correctly). But, if the IPv6 host sends a
singleton fragment (fragment header included, offset=3D0
and MF=3D0) then shouldn't the translator likewise also
honor the ID?

> so it's important that the source host
> puts the ID value in packets. I think there is a slight issue here,
> but that's not important here, as in the _stateful_ translation we
> require that all packets flow through the same translator in any
event.
>=20
> Additionally, there is actually a risk if we use the ID generated by
> the IPv6 hosts: suppose that two hosts both talk to google.com and
> they both choose ID 0xdead. Suppose the normal large first fragment /
> small second and last fragment case. Google could then easily
> reassemble a packet from fragment 1 from host A and fragment 2 from
> host B. This case becomes less of a corner case when there is a loss:
> if fragment 2 from host A is lost, and host B sends (for instance) 130
> packets during the time between when host A sends fragment 1 and it
> retransmits fragment 2, there is a one in 500 chance that the ID
> fields will clash.
>
> That's why I want the translator to generate new ID values for all
> IPv4 packets.

Now you have me worried. We have a 32-bit ID field in IPv6,
hence probabilities of collision are rather small. But, we
are only using the low-order 16bits of the ID when translating
into IPv4, hence a much greater probability of collision. But
with a service such as google, we may see many orders of
magnitude more IPv6 hosts trying to talk to google through
the translator such that the incidence of collision goes way
up *even if the translator (and not the source hosts) is the
one who chooses the IDs*.

We also have the transport port numbers to consider in terms
of translation stream separation, so inter-stream interference
may be ameliorated somewhat. But fragment misassociations
within a single stream at high data rates are still a problem
in any case.

> >> and DF=3D1 > 1280 byte packet sizes for IPv6->IPv4.
>=20
> > Enabling IPv4 path MTU discovery opens the system to
> > MTU-related black holing for the portion of the path
> > that is conveyed as IPv4.
>=20
> Is it a goal to make PMTUD for NAT64 better than for untranslated
> IPv4? If there's a black hole, you're going to have trouble regardless
> of the translation.
>=20
> We can of course set DF=3D0 for all packets but then, pretty much =
nobody
> does that for IPv4 today, even people who filter incoming ICMP, like
> microsoft.com.
>=20
> > It is therefore desirable to
> > locate the NAT64 as close as possible to the IPv4 end
> > system such that the surface for ICMP spoofing and
> > black holing is reduced. (AFAICT, that includes
> > performing the translation on the end system itself.)
>=20
> Unfortunately, the translation that we're talking about here happens
> fairly close to the IPv6 hosts =3D far from the IPv4 host.

Then, I expect there may be pathological interactions with
IP fragmentation in any case; especially when you set DF=3D0
and there is a link on the path with MTU<1280.

An alternative is to set DF=3D1 always, and if you get an
ICMP fragmentation needed with MTU<1280 declare the path
broken and go get the marginal link fixed. But, the ICMPs
might be filtered such that communications would silently
black hole - not good.=20

All of this would be made much more robust if the translator
could be located close to the IPv4 hosts; even if that means
tunneling IPv6 over IPv4 over an extended span.

Fred
fred.l.templin@boeing.com

From Fred.L.Templin@boeing.com  Thu Apr 16 14:41:38 2009
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Thread-Topic: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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References: 
From: "Templin, Fred L" 
To: "Dave Thaler" , "Fred Baker" , "Xing Li" , "congxiao" 
X-OriginalArrivalTime: 16 Apr 2009 21:42:24.0682 (UTC) FILETIME=[3AE330A0:01C9BEDC]
Cc: Behave WG 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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> -----Original Message-----
> From: Dave Thaler [mailto:dthaler@windows.microsoft.com]
> Sent: Tuesday, April 14, 2009 1:21 PM
> To: Fred Baker; Xing Li; congxiao
> Cc: Behave WG
> Subject: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
>=20
> I was out on jury duty last week so am still trying to catch up on
email,
> but I did have a chance to review the framework document and type up
> my comments.  There's a lot of them so they're inline in the attached
> PDF.
>=20
> In addition, I have a couple of general comments:
>=20
> The definition of "IPv{4,6}-only" talks about "two application
> instances are capable of communicating using IPv{4,6}...", and
> the title of the document is Framework for IPv4/IPv6 Translation.
> This is all well and good, except that in reading it this time I
realized
> the document today doesn't actually cover all of that.  Specifically
> what is missing is cases where there's an IPv{4,6}-only application
> running on a dual-stack (i.e. completely provisioned) host.  Section
1.5
> talks about connecting IPv{4,6} "networks".  This is sufficient only
> so long as you could define a single application instance as a
"network"
> which seems a bit unintuitive.
>=20
> In my view, the framework really should be an overall framework for
> talking about the problems.  Doing translation in a host, for example,
> should be within the scope of the framework.
>=20
> Some relevant RFCs (not saying these *solutions* need to be explained
> in the framework but they address scenarios, where the *scenario(s)*
> should be covered in the framework) are:
>  * RFC 2767 (Bump in the Stack)
>  * RFC 3338 (Bump in the API)
>  * RFC 3493's use of V4MAPPED addresses
>  * RFC 3142 (a TCP/UDP relay)
>=20
> For example, if you have an IPv4-application listening for incoming
> connections, on a node that has both IPv4 and IPv6 provisioned,
> and IPv4 and IPv6 addresses in DNS, then how can a client in an
> IPv6-only network talk to it?  (There could be a translator in
> the dual stack host, or a TDP/UDP relay, or the DNS ALG might
> synthesize AAAA records even though there's a real AAAA record
> - I brought this to the attention of the DNS64 draft authors in
> separate email.)  Currently this scenario isn't even mentioned,
> but should be, in my view.

I have to give this a +1. Using end-system-specific
translators (e.g., RFC2767) instead of in-the-network
translators would eliminate exposure to path MTU and
fragmentation issues such as Iljitsch and others have
been concerned about.

Thanks - Fred
fred.l.templin@boeing.com

> -Dave

From brian.e.carpenter@gmail.com  Thu Apr 16 16:44:24 2009
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Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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Iljitsch,

On 2009-04-16 21:44, Iljitsch van Beijnum wrote:
> On 15 apr 2009, at 5:02, Brian E Carpenter wrote:
> 
>> At least two bad things happen with 6to4 if the WKP is incorrectly
>> advertised or filtered.
> 
>> 1. 2002::/16 is advertised too far - that is to say, A advertises it
>> to B,
>> but the relay that A is operating has an ACL that drops IPv6 packets from
>> outside A. Users sending native IPv6 packets to a 6to4 destination via B
>> will be sending them into a black hole. In this case, A was wrong to
>> export the prefix.
> 
>> 2. 2002::/16 is advertised too short - that is to say, A advertises it
>> to B,
>> *and* is willing to relay IPv6 packets from B, but B drops the route.
>> Users
>> sending native IPv6 packets to a 6to4 destination via B will get
>> Destination
>> Unreachable. In this case, B was wrong to filter the prefix.
> 
>> Actually, the correct solution is that every ISP offering native IPv6
>> service
>> MUST either operate an inbound (to 6to4) relay or support a 2002::/16
>> route
>> to such a relay, and MUST NOT advertise such a route to other ISPs unless
>> it is willing to accept all traffic.
> 
>> I'm sure similar problems would arise with a NAT64 WKP, if used
>> carelessly.
>> But I think Xing Li's analysis a few days ago was correct.
> 
> The big difference between the 6to4 prefix and a NAT64 well-known prefix
> would be that the presence of 2002::/16 in the routing tables throughout
> the internet in some way is assumed, and trouble arises when this prefix
> can't be reached. With NAT64 there is no assumption (yet?) that each
> IPv6 host can blindly assume the NAT64 exists.
> 
> Also, with 2002::/16 the prefix is advertised globally by a good number
> of people. With the NAT64 WKP this would presumably not happen, and
> advertising it between ASes at all should probably be rare. Basically,
> 2002::/16 has global scope but the NAT64 WKP would have ULA-like scope:
> some exceptions are possible, but site scope is assumed.

I don't think we're in disagreement. The similarity with 2002::/16 is
that if you mess up the scope of the advertisement, you end up in trouble.
Unfortunately, the practical evidence from 2002::/16 is that people do
mess this up (and they mess up advertisement of 192.88.99.0/24 too).
We should have put more operational rules into RFC3056 and RFC3068,
and we need to have very clear operational rules for a NAT64 WKP.
Especially if exceptions from strict site-only scope are allowed.

    Brian

From xuxh@huawei.com  Thu Apr 16 21:20:03 2009
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Date: Fri, 17 Apr 2009 12:21:04 +0800
From: Xu Xiaohu 
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> > If the session (e.g. TCP connection) over the first one was 
> > established successfully and later interrupted due to the 
> failure of 
> > the first one, will the session automatically try the 
> second one? I'm 
> > not sure whether this feature can be supported by all current 
> > applications. Could anyone expertised in this field confirm it?
> >
> >
> >   
> 
> No, what i am saying is that for initial contact, if the 
> first address fails the apps should retru witht he next one 
> as per rfc3484 Preserving a connection or inmediatelly re 
> establishing a connection after a failure is a different 
> problem (that we are disucssing above)

I did know what you mean in the prevous email. I just want to explore it
further:)
 
> To me the scope of the fault tolerance that makes sense to 
> require for the base spec is that a new connection can get 
> estbalished after a fialure This does not imply that a 
> ongoing communication must be preserved or reestablished 
> automatically after a failure

To me,  The interruption of ongoing connection due to NAT64 switchover is
better to be avoided, and the re-establishment after NAT64 switchover much
be supported. That's to say, the former is a strong DESIRE, and the latter
is a MUST.

> > If one IPv6 host uses only one prefix64 for all connections, that's 
> > not a big problem. However, if the IPv6 host (e.g. attacker) is 
> > allowed to use different prefix64 for different connection, 
> that will 
> > become a nightmare since the NAT64 will need to maintain 
> one state per connection.
> >
> >   
> that's exactly the case, if the nat64 handles more than one 
> prefix645, then we need to maintain the destiantion address 
> in the binding state

Exactly. BTW, if we could assign different IPv4 pool corresponding to
different prefix64, (e.g. if an IPv6 host uses perfix64_A in the synthetical
IPv6 address, then the NAT64 assigns an IPv4 address from IPv4 address
Pool_A to this IPv6 host ,  if uses prefix64_B, allocates an IPv4 address
from Pool_B). In addition, if there is no mapping state synchronization
among multiple NAT64 boxes, the IPv4 address pools on each NAT64 should be
different from those on others. Is that works?

Xiaohu


From pierre.levis@orange-ftgroup.com  Thu Apr 16 23:29:48 2009
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Thread-Topic: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Yes if we read RFC4291 this way:=20
"For all unicast addresses, except those that start with the binary =
value 000, Interface IDs are required [...]to be constructed in Modified =
EUI-64 format."
it should!

But if we read RFC4291 that way:
"Interface identifiers in IPv6 unicast addresses are used to identify =
interfaces on a link. They are required to be unique within a subnet =
prefix."
"For all unicast addresses, except those that start with the binary =
value 000, Interface IDs are required [...] to be 64 bits long"
That means too:
A v4v6 address  with the IPv4 address that =
crosses the 64-bit boundary should be interpreted as:
 is the Network Prefix, it is 64-bit long=20
 is the IID, it is 64-bit long, it identifies an =
interface, and it is unique within 
Which is obviously not the case here!

So, as far as I understand, if we want to fully follow RFC4291, the only =
possibility is that Prefix is a IANA prefix, and that it begins with 000

Did I miss something?

Pierre=20

-----Message d'origine-----
De : Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]=20
Envoy=E9 : vendredi 17 avril 2009 01:52
=C0 : LEVIS Pierre RD-CORE-CAE
Objet : Re: [BEHAVE] Question on embedded address format in =
draft-baker-behave-v4v6-framework-02

On 2009-04-17 00:17, pierre.levis@orange-ftgroup.com wrote:
...
> If we look at RFC4291, we see that even if v4v6 addresses are indeed =
unicast addresses, they are not really in the scope, this 64-bit =
boundary does not really make sense here:
> "Interface identifiers in IPv6 unicast addresses are used to identify =
interfaces on a link. They are required to be unique within a subnet =
prefix."
> "For all unicast addresses, except those that start with the binary =
value 000, Interface IDs are required to be 64 bits long and to be =
constructed in Modified EUI-64 format."
>=20
> Thus, extension of prefixes beyond /64 can be done freely, without
> concern with a rule for links where subnet prefixes are /64.
>=20
> So, I tend to agree that for v4v6 addresses we should not care of this =
Modified EUI-64 format.

For addresses that start with binary 000 only. But for anything under an =
LIR prefix,
the EUI-64 requirement applies.

   Brian

From iljitsch@muada.com  Fri Apr 17 01:32:26 2009
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From: Iljitsch van Beijnum 
To: "Templin, Fred L" 
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Subject: Re: [BEHAVE] NAT64 fragmentation
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On 16 apr 2009, at 18:48, Templin, Fred L wrote:

>> This seemed unnecessarily complex to me, just setting DF=0 on <= 1280
>> byte packets and DF=1 on larger packets is simpler. So I asked Erik
>> Nordmark, author of RFC 2765, about this and he explained that SIIT
>> does this because it's stateless, so different fragments may flow
>> through different translators,

> If the IPv6 host fragments a packet into multiple IPv6
> fragments before sending, then for the reasons you
> mentioned the translators must honor the ID which the
> IPv6 host supplies (else, fragments of the same packet
> flowing through different translators would not be
> reassembled correctly). But, if the IPv6 host sends a
> singleton fragment (fragment header included, offset=0
> and MF=0) then shouldn't the translator likewise also
> honor the ID?

Well, I don't see a pressing need to do that in this case, but then  
again, I also don't see why it would make sense to specifically check  
for this condition.

Thinking a bit more about the ID issues, I've come to the conclusion  
that we should just ignore the issue, for the following reasons:

1. There doesn't seem to be a way to solve this well
2. Solving it "better" incurs significant complexity
3. Fragments in the IPv6-to-IPv4 direction SHOULD be rare

About that last point: basically, you get fragments when the  
application sends large packets, or the path MTU is small. The former  
case occurs with the DNS where DNS servers typically advertise a 2 or  
4 k buffer so if there is a big answer, this could be larger than what  
fits in 1500 bytes so the answer needs to be fragmented at the source.  
However, even if we assume many large answers few NAT64 users would  
have to answer thousands of DNS queries per second through a  
translator, so in practice this isn't an issue.

It's pretty much impossible for TCP fragments to occur with IPv6. With  
video streaming over UDP there could be a relatively large number of  
UDP packets, but applications limit their packet sizes to avoid  
fragmentation. Also, since the IPv6 hosts are _clients_, whenever  
there is video streaming it's probably not from many IPv6 hosts to a  
single IPv4 hosts (when the ID issues come up) more more like from  
each IPv6 host to a different IPv4 host.

I guess it's possible to have fragments generated by tunnels of some  
sort, but again, that would probably not be many IPv6 hosts to a  
single IPv4 host.

So my earlier suggestion to just copy the lower 15 bits of the IPv6 ID  
into the IPv4 ID when there is a fragment header or generate a new ID  
if there isn't with a different high order bit is probably sufficient.

[...]

>> That's why I want the translator to generate new ID values for all
>> IPv4 packets.

> Now you have me worried. We have a 32-bit ID field in IPv6,
> hence probabilities of collision are rather small. But, we
> are only using the low-order 16bits of the ID when translating
> into IPv4, hence a much greater probability of collision. But
> with a service such as google, we may see many orders of
> magnitude more IPv6 hosts trying to talk to google through
> the translator such that the incidence of collision goes way
> up *even if the translator (and not the source hosts) is the
> one who chooses the IDs*.

Right, but not for TCP, which I believe Google and the like use for  
the vast majority of their services.

>> Unfortunately, the translation that we're talking about here happens
>> fairly close to the IPv6 hosts = far from the IPv4 host.

> Then, I expect there may be pathological interactions with
> IP fragmentation in any case; especially when you set DF=0
> and there is a link on the path with MTU<1280.

Right. So don't use links with MTUs that small.

Can you think of a reasonable way to make this work better?

> An alternative is to set DF=1 always, and if you get an
> ICMP fragmentation needed with MTU<1280 declare the path
> broken and go get the marginal link fixed.

I don't see that happen.

> All of this would be made much more robust if the translator
> could be located close to the IPv4 hosts; even if that means
> tunneling IPv6 over IPv4 over an extended span.

You'd still need to cross that < 1280 byte link. If you do that with  
IPv4-in-IP tunneling then you'd need to fragment the outer header and  
now ALL packets will need a good ID value, while before we didn't have  
a problem with TCP.

I'm also quite uncomfortable by doing this much work for people who  
are too lazy to either:

1. upgrade to IPv6, or
2. use a reasonable MTU


From iljitsch@muada.com  Fri Apr 17 01:37:55 2009
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On 14 apr 2009, at 16:16, Lars Eggert wrote:

> please run your proposal on TCP MSS clamping by the TCPM WG. I'm not  
> aware of any existing RFC that describes/recommends this technique  
> (although it's obviously implemented in some products), and we need  
> to carefully discuss what we want to say here.

Ok, so far no reactions from tcpm.

However, after some more consideration I think it's better to drop  
this. There isn't much value in doing this, because in the common case  
where everyone involved has a 1500-byte MTU, it's not needed: in the  
IPv6-to-IPv4 direction the IPv6 host will think it can send 1520 byte  
packets after seeing a 1460 MSS but it obviously won't because it's  
limited to 1500 bytes itself. In the IPv4-to-IPv6 direction the IPv4  
host will see a 1440 MSS so it will send 1480 byte packets which will  
be 1500 bytes after translation so that works just fine as well.

Only when the IPv6 host supports larger packets it will send those  
1520-byte packets which will probably hit a 1500-byte MTU link so  
PMTUD will kick in but jumboframe-capable IPv6 hosts would be expected  
to see a lot of PMTUD activity so this shouldn't be a problem.

From lars.eggert@nokia.com  Fri Apr 17 02:17:24 2009
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Cc: "tcpm-chairs@tools.ietf.org" , Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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If you drop this, I'd suggest to include the argument below in the  
draft, so that implementors understand why it isn't needed. (They  
might otherwise decide to do the clamping anyway, "because the IETF  
forgot it.")

Lars


On 2009-4-17, at 11:38, Iljitsch van Beijnum wrote:

> On 14 apr 2009, at 16:16, Lars Eggert wrote:
>
>> please run your proposal on TCP MSS clamping by the TCPM WG. I'm not
>> aware of any existing RFC that describes/recommends this technique
>> (although it's obviously implemented in some products), and we need
>> to carefully discuss what we want to say here.
>
> Ok, so far no reactions from tcpm.
>
> However, after some more consideration I think it's better to drop
> this. There isn't much value in doing this, because in the common case
> where everyone involved has a 1500-byte MTU, it's not needed: in the
> IPv6-to-IPv4 direction the IPv6 host will think it can send 1520 byte
> packets after seeing a 1460 MSS but it obviously won't because it's
> limited to 1500 bytes itself. In the IPv4-to-IPv6 direction the IPv4
> host will see a 1440 MSS so it will send 1480 byte packets which will
> be 1500 bytes after translation so that works just fine as well.
>
> Only when the IPv6 host supports larger packets it will send those
> 1520-byte packets which will probably hit a 1500-byte MTU link so
> PMTUD will kick in but jumboframe-capable IPv6 hosts would be expected
> to see a lot of PMTUD activity so this shouldn't be a problem.


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From Fred.L.Templin@boeing.com  Fri Apr 17 08:22:14 2009
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From: "Templin, Fred L" 
To: "Iljitsch van Beijnum" 
X-OriginalArrivalTime: 17 Apr 2009 15:23:23.0801 (UTC) FILETIME=[72ADE090:01C9BF70]
Cc: "erik.nordmark@sun.com Nordmark" , Behave WG 
Subject: Re: [BEHAVE] NAT64 fragmentation
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Iljitsch,

> -----Original Message-----
> From: Iljitsch van Beijnum [mailto:iljitsch@muada.com]
> Sent: Friday, April 17, 2009 1:33 AM
> To: Templin, Fred L
> Cc: Behave WG; erik.nordmark@sun.com Nordmark
> Subject: Re: [BEHAVE] NAT64 fragmentation
>=20
> On 16 apr 2009, at 18:48, Templin, Fred L wrote:
>=20
> >> This seemed unnecessarily complex to me, just setting DF=3D0 on =
<=3D
1280
> >> byte packets and DF=3D1 on larger packets is simpler. So I asked =
Erik
> >> Nordmark, author of RFC 2765, about this and he explained that SIIT
> >> does this because it's stateless, so different fragments may flow
> >> through different translators,
>=20
> > If the IPv6 host fragments a packet into multiple IPv6
> > fragments before sending, then for the reasons you
> > mentioned the translators must honor the ID which the
> > IPv6 host supplies (else, fragments of the same packet
> > flowing through different translators would not be
> > reassembled correctly). But, if the IPv6 host sends a
> > singleton fragment (fragment header included, offset=3D0
> > and MF=3D0) then shouldn't the translator likewise also
> > honor the ID?
>=20
> Well, I don't see a pressing need to do that in this case, but then
> again, I also don't see why it would make sense to specifically check
> for this condition.
>=20
> Thinking a bit more about the ID issues, I've come to the conclusion
> that we should just ignore the issue, for the following reasons:
>=20
> 1. There doesn't seem to be a way to solve this well
> 2. Solving it "better" incurs significant complexity
> 3. Fragments in the IPv6-to-IPv4 direction SHOULD be rare
>=20
> About that last point: basically, you get fragments when the
> application sends large packets, or the path MTU is small. The former
> case occurs with the DNS where DNS servers typically advertise a 2 or
> 4 k buffer so if there is a big answer, this could be larger than what
> fits in 1500 bytes so the answer needs to be fragmented at the source.
> However, even if we assume many large answers few NAT64 users would
> have to answer thousands of DNS queries per second through a
> translator, so in practice this isn't an issue.

You get fragments when the IPv6 host performs host
fragmentation, e.g., to a maximum fragment size of 1280.
I don't think it is possible to say (sic) "its only DNS",
or "it will never be TCP", etc. Fragments are fragments,
and the translator has no way to control an IPv6 host that
wants to produce them.

> It's pretty much impossible for TCP fragments to occur with IPv6. With
> video streaming over UDP there could be a relatively large number of
> UDP packets, but applications limit their packet sizes to avoid
> fragmentation. Also, since the IPv6 hosts are _clients_, whenever
> there is video streaming it's probably not from many IPv6 hosts to a
> single IPv4 hosts (when the ID issues come up) more more like from
> each IPv6 host to a different IPv4 host.
>=20
> I guess it's possible to have fragments generated by tunnels of some
> sort, but again, that would probably not be many IPv6 hosts to a
> single IPv4 host.
>=20
> So my earlier suggestion to just copy the lower 15 bits of the IPv6 ID
> into the IPv4 ID when there is a fragment header or generate a new ID
> if there isn't with a different high order bit is probably sufficient.

So, you are suggesting to code the IP ID?

> [...]
>=20
> >> That's why I want the translator to generate new ID values for all
> >> IPv4 packets.
>=20
> > Now you have me worried. We have a 32-bit ID field in IPv6,
> > hence probabilities of collision are rather small. But, we
> > are only using the low-order 16bits of the ID when translating
> > into IPv4, hence a much greater probability of collision. But
> > with a service such as google, we may see many orders of
> > magnitude more IPv6 hosts trying to talk to google through
> > the translator such that the incidence of collision goes way
> > up *even if the translator (and not the source hosts) is the
> > one who chooses the IDs*.
>=20
> Right, but not for TCP, which I believe Google and the like use for
> the vast majority of their services.
>=20
> >> Unfortunately, the translation that we're talking about here
happens
> >> fairly close to the IPv6 hosts =3D far from the IPv4 host.
>=20
> > Then, I expect there may be pathological interactions with
> > IP fragmentation in any case; especially when you set DF=3D0
> > and there is a link on the path with MTU<1280.
>=20
> Right. So don't use links with MTUs that small.

We can't control what links are out there in the wild; we
have to find some way to live with them.

> Can you think of a reasonable way to make this work better?

Yes - attach the translator directly to the IPv4 host.

Fred
fred.l.templin@boeing.com

> > An alternative is to set DF=3D1 always, and if you get an
> > ICMP fragmentation needed with MTU<1280 declare the path
> > broken and go get the marginal link fixed.
>=20
> I don't see that happen.
>=20
> > All of this would be made much more robust if the translator
> > could be located close to the IPv4 hosts; even if that means
> > tunneling IPv6 over IPv4 over an extended span.
>=20
> You'd still need to cross that < 1280 byte link. If you do that with
> IPv4-in-IP tunneling then you'd need to fragment the outer header and
> now ALL packets will need a good ID value, while before we didn't have
> a problem with TCP.
>=20
> I'm also quite uncomfortable by doing this much work for people who
> are too lazy to either:
>=20
> 1. upgrade to IPv6, or
> 2. use a reasonable MTU


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To: "Templin, Fred L" 
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Subject: Re: [BEHAVE] NAT64 fragmentation
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Hi Fred,

On 17 apr 2009, at 17:23, Templin, Fred L wrote:

> You get fragments when the IPv6 host performs host
> fragmentation, e.g., to a maximum fragment size of 1280.
> I don't think it is possible to say (sic) "its only DNS",
> or "it will never be TCP", etc. Fragments are fragments,
> and the translator has no way to control an IPv6 host that
> wants to produce them.

Of course.

However, we know we can make basic fragmentation work fairly well for  
limited numbers of fragmented packets per second. As soon as ID space  
wrapping issues start to crop up (4k fragmented packets per second?)  
we're in trouble, and there is no real solution. The question is  
whether it's worth the extra trouble to go from a 60% solution to a  
80% solution.

Based on the logic explained in my previous message, my position is  
that the number of fragments will almost certainly be so low that ID  
wrapping issues should be extremely rare to spending extra resources  
to improve this are not worth it.

>> So my earlier suggestion to just copy the lower 15 bits of the IPv6  
>> ID
>> into the IPv4 ID when there is a fragment header or generate a new ID
>> if there isn't with a different high order bit is probably  
>> sufficient.

> So, you are suggesting to code the IP ID?

Not sure what you mean by that.

>> Can you think of a reasonable way to make this work better?

> Yes - attach the translator directly to the IPv4 host.

That's not going to happen in the scenario that we're trying to  
address with the NAT64 draft.

From fred@cisco.com  Fri Apr 17 08:39:05 2009
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From: Fred Baker 
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Cc: Behave WG , congxiao , Xing Li , Dave Thaler 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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Fred, maybe you want to push the end-system-specific model in a  
separate draft. We are working on an in-network model, and going into  
scenarios that are not in-network will complicate things dramatically.

And I have to ask, why would the end system translate? Why would it  
not simply deploy natively? The point here is that you have an end  
system that will happily use whatever the network provides, but the  
network provision is IPv4 or IPv6 but not both.

On Apr 16, 2009, at 5:42 PM, Templin, Fred L wrote:

>
>
>> -----Original Message-----
>> From: Dave Thaler [mailto:dthaler@windows.microsoft.com]
>> Sent: Tuesday, April 14, 2009 1:21 PM
>> To: Fred Baker; Xing Li; congxiao
>> Cc: Behave WG
>> Subject: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
>>
>> I was out on jury duty last week so am still trying to catch up on
> email,
>> but I did have a chance to review the framework document and type up
>> my comments.  There's a lot of them so they're inline in the attached
>> PDF.
>>
>> In addition, I have a couple of general comments:
>>
>> The definition of "IPv{4,6}-only" talks about "two application
>> instances are capable of communicating using IPv{4,6}...", and
>> the title of the document is Framework for IPv4/IPv6 Translation.
>> This is all well and good, except that in reading it this time I
> realized
>> the document today doesn't actually cover all of that.  Specifically
>> what is missing is cases where there's an IPv{4,6}-only application
>> running on a dual-stack (i.e. completely provisioned) host.  Section
> 1.5
>> talks about connecting IPv{4,6} "networks".  This is sufficient only
>> so long as you could define a single application instance as a
> "network"
>> which seems a bit unintuitive.
>>
>> In my view, the framework really should be an overall framework for
>> talking about the problems.  Doing translation in a host, for  
>> example,
>> should be within the scope of the framework.
>>
>> Some relevant RFCs (not saying these *solutions* need to be explained
>> in the framework but they address scenarios, where the *scenario(s)*
>> should be covered in the framework) are:
>> * RFC 2767 (Bump in the Stack)
>> * RFC 3338 (Bump in the API)
>> * RFC 3493's use of V4MAPPED addresses
>> * RFC 3142 (a TCP/UDP relay)
>>
>> For example, if you have an IPv4-application listening for incoming
>> connections, on a node that has both IPv4 and IPv6 provisioned,
>> and IPv4 and IPv6 addresses in DNS, then how can a client in an
>> IPv6-only network talk to it?  (There could be a translator in
>> the dual stack host, or a TDP/UDP relay, or the DNS ALG might
>> synthesize AAAA records even though there's a real AAAA record
>> - I brought this to the attention of the DNS64 draft authors in
>> separate email.)  Currently this scenario isn't even mentioned,
>> but should be, in my view.
>
> I have to give this a +1. Using end-system-specific
> translators (e.g., RFC2767) instead of in-the-network
> translators would eliminate exposure to path MTU and
> fragmentation issues such as Iljitsch and others have
> been concerned about.
>
> Thanks - Fred
> fred.l.templin@boeing.com
>
>> -Dave


From fred@cisco.com  Fri Apr 17 08:41:34 2009
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Cc: behave@ietf.org
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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> Did I miss something?


besides that an unroutable prefix makes translation a real pain in the =20=

network, which is why deployed translators (including both CERNET's =20
IVI and many NAT-PT deployments) use anything but the magic prefix =20
model that this working group so strongly likes?

No, nothing at all.

On Apr 17, 2009, at 2:30 AM,  wrote:

>
> Yes if we read RFC4291 this way:
> "For all unicast addresses, except those that start with the binary =20=

> value 000, Interface IDs are required [...]to be constructed in =20
> Modified EUI-64 format."
> it should!
>
> But if we read RFC4291 that way:
> "Interface identifiers in IPv6 unicast addresses are used to =20
> identify interfaces on a link. They are required to be unique within =20=

> a subnet prefix."
> "For all unicast addresses, except those that start with the binary =20=

> value 000, Interface IDs are required [...] to be 64 bits long"
> That means too:
> A v4v6 address  with the IPv4 address =20
> that crosses the 64-bit boundary should be interpreted as:
>  is the Network Prefix, it is 64-bit long
>  is the IID, it is 64-bit long, it identifies an =20
> interface, and it is unique within 
> Which is obviously not the case here!
>
> So, as far as I understand, if we want to fully follow RFC4291, the =20=

> only possibility is that Prefix is a IANA prefix, and that it begins =20=

> with 000
>
> Did I miss something?
>
> Pierre
>
> -----Message d'origine-----
> De : Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
> Envoy=E9 : vendredi 17 avril 2009 01:52
> =C0 : LEVIS Pierre RD-CORE-CAE
> Objet : Re: [BEHAVE] Question on embedded address format in draft-=20
> baker-behave-v4v6-framework-02
>
> On 2009-04-17 00:17, pierre.levis@orange-ftgroup.com wrote:
> ...
>> If we look at RFC4291, we see that even if v4v6 addresses are =20
>> indeed unicast addresses, they are not really in the scope, this 64-=20=

>> bit boundary does not really make sense here:
>> "Interface identifiers in IPv6 unicast addresses are used to =20
>> identify interfaces on a link. They are required to be unique =20
>> within a subnet prefix."
>> "For all unicast addresses, except those that start with the binary =20=

>> value 000, Interface IDs are required to be 64 bits long and to be =20=

>> constructed in Modified EUI-64 format."
>>
>> Thus, extension of prefixes beyond /64 can be done freely, without
>> concern with a rule for links where subnet prefixes are /64.
>>
>> So, I tend to agree that for v4v6 addresses we should not care of =20
>> this Modified EUI-64 format.
>
> For addresses that start with binary 000 only. But for anything =20
> under an LIR prefix,
> the EUI-64 requirement applies.
>
>   Brian
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From marcelo@it.uc3m.es  Fri Apr 17 11:51:20 2009
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Cc: behave@ietf.org, pierre.levis@orange-ftgroup.com
Subject: Re: [BEHAVE] Question on embedded address format in	draft-baker-behave-v4v6-framework-02
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Fred Baker escribió:
>> Did I miss something?
>
>
> besides that an unroutable prefix makes translation a real pain in the 
> network, which is why deployed translators (including both CERNET's 
> IVI and many NAT-PT deployments) use anything but the magic prefix 
> model that this working group so strongly likes?
maybe the reason why current NATPT doesn't use the WK prefix it is 
beacuse the WK prefix was not defined before and the NATPT spec ony 
defined the use of the now called LIR prefix?


>
> No, nothing at all.
>
> On Apr 17, 2009, at 2:30 AM,  wrote:
>
>>
>> Yes if we read RFC4291 this way:
>> "For all unicast addresses, except those that start with the binary 
>> value 000, Interface IDs are required [...]to be constructed in 
>> Modified EUI-64 format."
>> it should!
>>
>> But if we read RFC4291 that way:
>> "Interface identifiers in IPv6 unicast addresses are used to identify 
>> interfaces on a link. They are required to be unique within a subnet 
>> prefix."
>> "For all unicast addresses, except those that start with the binary 
>> value 000, Interface IDs are required [...] to be 64 bits long"
>> That means too:
>> A v4v6 address  with the IPv4 address 
>> that crosses the 64-bit boundary should be interpreted as:
>>  is the Network Prefix, it is 64-bit long
>>  is the IID, it is 64-bit long, it identifies an 
>> interface, and it is unique within 
>> Which is obviously not the case here!
>>
>> So, as far as I understand, if we want to fully follow RFC4291, the 
>> only possibility is that Prefix is a IANA prefix, and that it begins 
>> with 000
>>
>> Did I miss something?
>>
>> Pierre
>>
>> -----Message d'origine-----
>> De : Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>> Envoyé : vendredi 17 avril 2009 01:52
>> À : LEVIS Pierre RD-CORE-CAE
>> Objet : Re: [BEHAVE] Question on embedded address format in 
>> draft-baker-behave-v4v6-framework-02
>>
>> On 2009-04-17 00:17, pierre.levis@orange-ftgroup.com wrote:
>> ...
>>> If we look at RFC4291, we see that even if v4v6 addresses are indeed 
>>> unicast addresses, they are not really in the scope, this 64-bit 
>>> boundary does not really make sense here:
>>> "Interface identifiers in IPv6 unicast addresses are used to 
>>> identify interfaces on a link. They are required to be unique within 
>>> a subnet prefix."
>>> "For all unicast addresses, except those that start with the binary 
>>> value 000, Interface IDs are required to be 64 bits long and to be 
>>> constructed in Modified EUI-64 format."
>>>
>>> Thus, extension of prefixes beyond /64 can be done freely, without
>>> concern with a rule for links where subnet prefixes are /64.
>>>
>>> So, I tend to agree that for v4v6 addresses we should not care of 
>>> this Modified EUI-64 format.
>>
>> For addresses that start with binary 000 only. But for anything under 
>> an LIR prefix,
>> the EUI-64 requirement applies.
>>
>>   Brian
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>


From Fred.L.Templin@boeing.com  Fri Apr 17 15:39:16 2009
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Date: Fri, 17 Apr 2009 15:39:21 -0700
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Thread-Topic: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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From: "Templin, Fred L" 
To: "Fred Baker" 
X-OriginalArrivalTime: 17 Apr 2009 22:40:19.0635 (UTC) FILETIME=[7C88B030:01C9BFAD]
Cc: Behave WG , congxiao , Xing Li , Dave Thaler 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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Fred:

> -----Original Message-----
> From: Fred Baker [mailto:fred@cisco.com]
> Sent: Friday, April 17, 2009 8:40 AM
> To: Templin, Fred L
> Cc: Dave Thaler; Xing Li; congxiao; Behave WG
> Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
>=20
> Fred, maybe you want to push the end-system-specific model in a
> separate draft. We are working on an in-network model, and going into
> scenarios that are not in-network will complicate things dramatically.
>=20
> And I have to ask, why would the end system translate? Why would it
> not simply deploy natively?

Deploy natively, sure - but, translate to accommodate
legacy apps if necessary.

> The point here is that you have an end
> system that will happily use whatever the network provides, but the
> network provision is IPv4 or IPv6 but not both.

Why not both?

Fred
fred.l.templin@boeing.com
=20
> On Apr 16, 2009, at 5:42 PM, Templin, Fred L wrote:
>=20
> >
> >
> >> -----Original Message-----
> >> From: Dave Thaler [mailto:dthaler@windows.microsoft.com]
> >> Sent: Tuesday, April 14, 2009 1:21 PM
> >> To: Fred Baker; Xing Li; congxiao
> >> Cc: Behave WG
> >> Subject: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
> >>
> >> I was out on jury duty last week so am still trying to catch up on
> > email,
> >> but I did have a chance to review the framework document and type
up
> >> my comments.  There's a lot of them so they're inline in the
attached
> >> PDF.
> >>
> >> In addition, I have a couple of general comments:
> >>
> >> The definition of "IPv{4,6}-only" talks about "two application
> >> instances are capable of communicating using IPv{4,6}...", and
> >> the title of the document is Framework for IPv4/IPv6 Translation.
> >> This is all well and good, except that in reading it this time I
> > realized
> >> the document today doesn't actually cover all of that.
Specifically
> >> what is missing is cases where there's an IPv{4,6}-only application
> >> running on a dual-stack (i.e. completely provisioned) host.
Section
> > 1.5
> >> talks about connecting IPv{4,6} "networks".  This is sufficient
only
> >> so long as you could define a single application instance as a
> > "network"
> >> which seems a bit unintuitive.
> >>
> >> In my view, the framework really should be an overall framework for
> >> talking about the problems.  Doing translation in a host, for
> >> example,
> >> should be within the scope of the framework.
> >>
> >> Some relevant RFCs (not saying these *solutions* need to be
explained
> >> in the framework but they address scenarios, where the
*scenario(s)*
> >> should be covered in the framework) are:
> >> * RFC 2767 (Bump in the Stack)
> >> * RFC 3338 (Bump in the API)
> >> * RFC 3493's use of V4MAPPED addresses
> >> * RFC 3142 (a TCP/UDP relay)
> >>
> >> For example, if you have an IPv4-application listening for incoming
> >> connections, on a node that has both IPv4 and IPv6 provisioned,
> >> and IPv4 and IPv6 addresses in DNS, then how can a client in an
> >> IPv6-only network talk to it?  (There could be a translator in
> >> the dual stack host, or a TDP/UDP relay, or the DNS ALG might
> >> synthesize AAAA records even though there's a real AAAA record
> >> - I brought this to the attention of the DNS64 draft authors in
> >> separate email.)  Currently this scenario isn't even mentioned,
> >> but should be, in my view.
> >
> > I have to give this a +1. Using end-system-specific
> > translators (e.g., RFC2767) instead of in-the-network
> > translators would eliminate exposure to path MTU and
> > fragmentation issues such as Iljitsch and others have
> > been concerned about.
> >
> > Thanks - Fred
> > fred.l.templin@boeing.com
> >
> >> -Dave


From dthaler@windows.microsoft.com  Fri Apr 17 16:19:34 2009
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From: Dave Thaler 
To: Fred Baker , Xing Li , congxiao 
Date: Fri, 17 Apr 2009 16:20:41 -0700
Thread-Topic: Comments on draft-baker-behave-v4v6-translation-02
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Attached is a marked up copy with my comments inline.

A summary of some of the main ones:

* As discussed in the WG meeting, I believe this document
  should be independent of the mechanism used to choose
  the source/dest addresses to put into a translated
  header.  This doc shouldn't require updating if another
  mechanism is added in the future, and it should be
  sufficient to apply to SIIT, BIS, NAT64, SAM, IVI, etc.

* RFC 2765 assumes a (1's complement) checksum-neutral
  address translation.  The current draft assumes a
  non-checksum-neutral address translation.  Personally,
  I strongly prefer checksum-neutral translation (and
  I believe this can be done, as shown by Margaret for
  NAT66 and I believe the same concept can work for
  IPv4<->IPv6 translation).  Hence I would want the
  SIIT update to either assume checksum-neutral translation
  if we know of no reason to allow non-neutral, or else
  allow for either possibility (which would provide
  better assurance that we won't need to update the
  document in the future).

-Dave

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Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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Brian E Carpenter skrev:
> Dave,
> 
> On 2009-04-15 08:21, Dave Thaler wrote:
>> I was out on jury duty last week so am still trying to catch up on email,
>> but I did have a chance to review the framework document and type up
>> my comments.  There's a lot of them so they're inline in the attached
>> PDF.
>>
>> In addition, I have a couple of general comments:
>>
>> The definition of "IPv{4,6}-only" talks about "two application
>> instances are capable of communicating using IPv{4,6}...", and
>> the title of the document is Framework for IPv4/IPv6 Translation.
>> This is all well and good, except that in reading it this time I realized
>> the document today doesn't actually cover all of that.  Specifically
>> what is missing is cases where there's an IPv{4,6}-only application
>> running on a dual-stack (i.e. completely provisioned) host.  Section 1.5
>> talks about connecting IPv{4,6} "networks".  This is sufficient only
>> so long as you could define a single application instance as a "network"
>> which seems a bit unintuitive.
>>
>> In my view, the framework really should be an overall framework for
>> talking about the problems.  Doing translation in a host, for example,
>> should be within the scope of the framework.
> 
> I understood that the AD's guidance was to limit the scenarios
> to the separate-translator-box cases that the draft covers. Won't we
> complicate the discussion enormously by expanding the scope as you
> describe?
> 

I think the further discussion indicates that it is likely complicating
things. So far all discussion has been focused on the in the network
translator model. I am not against separate documents discussing this
use case, but lets try to avoid feature creep that results in extra delay.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  +46 10 7148287
Färögatan 6                | Mobile +46 73 0949079
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From iljitsch@muada.com  Mon Apr 20 06:01:07 2009
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On 18 apr 2009, at 1:20, Dave Thaler wrote:

> * RFC 2765 assumes a (1's complement) checksum-neutral
>  address translation.  The current draft assumes a
>  non-checksum-neutral address translation.  Personally,
>  I strongly prefer checksum-neutral translation (and
>  I believe this can be done, as shown by Margaret for
>  NAT66 and I believe the same concept can work for
>  IPv4<->IPv6 translation).  Hence I would want the
>  SIIT update to either assume checksum-neutral translation
>  if we know of no reason to allow non-neutral, or else
>  allow for either possibility (which would provide
>  better assurance that we won't need to update the
>  document in the future).

I agree, also strongly. In the case of a 1-to-1 translation, there is  
no obvious reason why the translation can't be checksum-neutral and  
hence work with non-TCP/UDP transport protocols, including future  
ones, without problems. It should also save some cycles in the  
translation process.


From moore@network-heretics.com  Mon Apr 20 07:04:13 2009
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Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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Iljitsch van Beijnum wrote:
> On 18 apr 2009, at 1:20, Dave Thaler wrote:
> 
>> * RFC 2765 assumes a (1's complement) checksum-neutral
>>  address translation.  The current draft assumes a
>>  non-checksum-neutral address translation.  Personally,
>>  I strongly prefer checksum-neutral translation (and
>>  I believe this can be done, as shown by Margaret for
>>  NAT66 and I believe the same concept can work for
>>  IPv4<->IPv6 translation).  Hence I would want the
>>  SIIT update to either assume checksum-neutral translation
>>  if we know of no reason to allow non-neutral, or else
>>  allow for either possibility (which would provide
>>  better assurance that we won't need to update the
>>  document in the future).
> 
> I agree, also strongly. In the case of a 1-to-1 translation, there is no
> obvious reason why the translation can't be checksum-neutral and hence
> work with non-TCP/UDP transport protocols, including future ones,
> without problems. It should also save some cycles in the translation
> process.

I don't have any problem with a checksum-neutral address mapping
algorithm, but let's not kid ourselves.  There's no guarantee that such
a translation will "work with non-TCP/UDP transport protocols, including
future ones, without problems" because there's no guarantee that future
transport protocols will use the same checksum algorithm.

(I also don't see how it saves cycles in the translation process, as the
effort required to calculate the mapped address is about the same as
that required to incrementally update the checksum.)

I also don't think that the idea can be applied to IPv4<>IPv6 mapping in
general, because there are several other design considerations for such
mapping.  Another way to put this is that I don't see any broad
applicability for stateless v4<>v6 mapping - I think it's a corner case
that will not be used terribly often in practice.

Keith

From iljitsch@muada.com  Mon Apr 20 07:35:27 2009
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On 20 apr 2009, at 16:04, Keith Moore wrote:

>> In the case of a 1-to-1 translation, there is no
>> obvious reason why the translation can't be checksum-neutral and  
>> hence
>> work with non-TCP/UDP transport protocols, including future ones,
>> without problems. It should also save some cycles in the translation
>> process.

> I don't have any problem with a checksum-neutral address mapping
> algorithm, but let's not kid ourselves.  There's no guarantee that  
> such
> a translation will "work with non-TCP/UDP transport protocols

Since when are there any guarantees anywhere in life?

> including
> future ones, without problems" because there's no guarantee that  
> future
> transport protocols will use the same checksum algorithm.

True. But DCCP does. And SCTP, that doesn't, doesn't include the  
pseudo-header in the checksum, which is, in my opion, the correct way  
to do things without violating layers. On the other hand, SCTP  
includes address management that would probably fail in the presence  
of protocol translation.

In a one-to-many NAT when there is a protocol that doesn't have port  
numbers (as far as the NAT knows) the NAT can only create a one-to-one  
mapping so only one user can use the protocol. In the case of a one-to- 
one translator that's not exactly a limitation so the only issue would  
be a protocol that uses the normal checksum including pseudo-header.  
Protocols that don't use a checksum (such as tunnels) or don't include  
the pseudo-header should work without trouble if the translator  
translates just the IP header. So I guess this issue isn't all that  
prominent. Then again, the normal checksum has been in wide use for  
decades so maybe a new protocol will want to use it, too.

> (I also don't see how it saves cycles in the translation process, as  
> the
> effort required to calculate the mapped address is about the same as
> that required to incrementally update the checksum.)

A translated address that is checksum-equivalant to the address being  
translated from only needs to be computed once. An incremental update  
of the TCP or UDP checksum must be done for every packet, and has the  
issue that it's necessary to look significantly deeper inside packets.  
Not exactly a show stopper in the cases where this can be done  
successfully, but why require it?

> Another way to put this is that I don't see any broad
> applicability for stateless v4<>v6 mapping - I think it's a corner  
> case
> that will not be used terribly often in practice.

I know there are people making their services available over IPv6 by  
putting a reverse proxy in front of an IPv4 service. Doing this with  
stateless translation would be a good alternative.

From remi.despres@free.fr  Mon Apr 20 08:23:31 2009
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Subject: Re: [BEHAVE] The case for keeping UDP-TCP checksum updates in the v4v6 translation draft
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Dave Thaler  -  le (m/j/a) 4/18/09 1:20 AM:
> * RFC 2765 assumes a (1's complement) checksum-neutral address
> translation.  The current draft assumes a non-checksum-neutral
> address translation.

The point made to justify it seems to me valid and important:
    "Since the ICMP [RFC0792][RFC4443],
    TCP [RFC0793] and UDP [RFC0768] headers consist of check sums which
    include the IP header, the recalculation and updating of the ICMP
    header and the transport-layer headers MUST be performed.  This is
    different from [RFC2765], since [RFC2765] uses special prefix
    (0::ffff:0:a:b:c:d) to avoid the recalculation of the transport-layer
    header checksum."

1's complement checksum neutrality imposes that the checksum of the 2 
IPv6 addresses be the same as that of the 2 v4 addresses.

This creates a complex constraint on values of v6 address bits other 
than those of embedded v4 addresses.


> Personally, I strongly prefer checksum-neutral translation 

The choice seems to be between
- freedom of IPv6 address format, with a necessary detection of whether 
transport is TCP, UDP.
- right to ignore which transport is used (yet having to recognize 
ICMP), and impose for this constraints on Ipv6 addresses

If the only expected IPv6 option is that of fragmentation, as assumed in 
the draft, detecting that transport is TCP or UDP is trivial, in both 
V6toV4 and V4toV6 directions.
Avoiding this detection doesn't seem therefore a reasonable choice if 
the price paid is adding new constraints on IPv6 address formats.


> I believe this can be done, as shown by Margaret for NAT66

Note that in Margaret's NAT66:
- ISP prefixes MUST be "/48 or shorter"
- Subnet numbers MUST be "non-0xFFFF".

I hope you can share the view that these kind of restrictions create a 
relationship between parts of the general architecture that makes it 
more complex to understand and maintain.

> and I
> believe the same concept can work for IPv4<->IPv6 translation).
> Hence I would want the SIIT update to either assume checksum-neutral
> translation if we know of no reason to allow non-neutral, or else 
> allow for either possibility (which would provide better assurance
> that we won't need to update the document in the future).

In my understanding the draft proposal not only is, _as far as users are 
concerned_, CHECKSUM NEUTRAL: it works with checksums of TCP, UDP, SCTP, 
DCCP etc... (This neutrality is not achieved at the IP layer alone, but 
is this of any importance in practice?)

Now the point is that it is ALSO IPv6-address-structure neutral, a 
highly important property IMHO.

I hope to have provided reasons to keep the proposal as is, and  to 
recommend it EXCLUSIVELY. (Allowing for either design would be losing on 
both sides: (1) no single recommended behavior (2) consequently, 
constraint on IPv6 address structures for compatibility with all 
recommended implementations).

Regards,

RD








From moore@network-heretics.com  Mon Apr 20 08:27:03 2009
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Iljitsch van Beijnum wrote:
> 
> On 20 apr 2009, at 16:04, Keith Moore wrote:
> 
>>> In the case of a 1-to-1 translation, there is no
>>> obvious reason why the translation can't be checksum-neutral and hence
>>> work with non-TCP/UDP transport protocols, including future ones,
>>> without problems. It should also save some cycles in the translation
>>> process.
> 
>> I don't have any problem with a checksum-neutral address mapping
>> algorithm, but let's not kid ourselves.  There's no guarantee that such
>> a translation will "work with non-TCP/UDP transport protocols
> 
> Since when are there any guarantees anywhere in life?
> 
>> including
>> future ones, without problems" because there's no guarantee that future
>> transport protocols will use the same checksum algorithm.
> 
> True. But DCCP does. And SCTP, that doesn't, doesn't include the
> pseudo-header in the checksum, which is, in my opion, the correct way to
> do things without violating layers. On the other hand, SCTP includes
> address management that would probably fail in the presence of protocol
> translation.
> 
> In a one-to-many NAT when there is a protocol that doesn't have port
> numbers (as far as the NAT knows) the NAT can only create a one-to-one
> mapping so only one user can use the protocol. In the case of a
> one-to-one translator that's not exactly a limitation so the only issue
> would be a protocol that uses the normal checksum including
> pseudo-header. Protocols that don't use a checksum (such as tunnels) or
> don't include the pseudo-header should work without trouble if the
> translator translates just the IP header. So I guess this issue isn't
> all that prominent. Then again, the normal checksum has been in wide use
> for decades so maybe a new protocol will want to use it, too.

The "normal" transport layer checksum that has been in wide use for
decades doesn't actually provide very much protection against packet
corruption, in light of current-day e2e bandwidths and the tendency of
applications to transfer more and more data.  So this argues for either
doing away with the transport level checksum (as useless overhead) or
having a more robust checksum.  I would not want to hazard a guess on
which way things will go for future transport protocols.  (Nor would I
want to saddle future transport protocols with an incentive to keep
using the same "normal" checksum.)

>> (I also don't see how it saves cycles in the translation process, as the
>> effort required to calculate the mapped address is about the same as
>> that required to incrementally update the checksum.)
> 
> A translated address that is checksum-equivalant to the address being
> translated from only needs to be computed once. An incremental update of
> the TCP or UDP checksum must be done for every packet, and has the issue
> that it's necessary to look significantly deeper inside packets. Not
> exactly a show stopper in the cases where this can be done successfully,
> but why require it?

I don't get your argument that the translation only needs to be computed
once, because in a stateless translator there's no state kept between
packets to allow the results of previous computations to be stored.
I'll certainly grant that in the (currently rare) case of IP options the
packet inspection is more work to update the transport-level checksum
than it is to update the IP address.

The important point here is that there are lots of different use cases
for v4-v6 NAT, and the best choice of mapping algorithm is going to be
different for different use cases.  Checksum-neutral mapping provides a
useful benefit in some cases, but it does come at a cost.  Consider, for
example, a multihomed network using stateless v4-v6 NATs at its borders.
 With checksum-neutral mapping the relationship between internal and
external addresses, and the relationship between different external
addresses that map to the same internal address, is less obvious than if
a different algorithm were used.  This has the potential to impact DNS,
network management, security (as in packet tracing across NAT
boundaries), etc.

So in summary: yes, it's a useful tool; no, it shouldn't be required
everywhere.

>> Another way to put this is that I don't see any broad
>> applicability for stateless v4<>v6 mapping - I think it's a corner case
>> that will not be used terribly often in practice.
> 
> I know there are people making their services available over IPv6 by
> putting a reverse proxy in front of an IPv4 service. Doing this with
> stateless translation would be a good alternative.

It might be a good alternative.  Or it might be a pain in the a**,
depending on things like the length of the v6 prefix in use, and whether
that v6 prefix were also being used for "native" purposes (and thus
subnetted and routed within that network).  It leads to a tussle between
use of prefix bits for checksum-neutral mapping and use of prefix bits
for subnetting.

Keith

From Fred.L.Templin@boeing.com  Mon Apr 20 10:18:05 2009
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Thread-Topic: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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References: <49E550CE.4040908@gmail.com> <49EC3E61.1050806@ericsson.com>
From: "Templin, Fred L" 
To: "Magnus Westerlund" , "Brian E Carpenter" 
X-OriginalArrivalTime: 20 Apr 2009 17:18:34.0741 (UTC) FILETIME=[0928E250:01C9C1DC]
Cc: Behave WG , congxiao , Xing Li , Fred Baker , Dave Thaler 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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> -----Original Message-----
> From: Magnus Westerlund [mailto:magnus.westerlund@ericsson.com]
> Sent: Monday, April 20, 2009 2:21 AM
> To: Brian E Carpenter
> Cc: Xing Li; congxiao; Behave WG; Fred Baker; Dave Thaler
> Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
>=20
> Brian E Carpenter skrev:
> > Dave,
> >
> > On 2009-04-15 08:21, Dave Thaler wrote:
> >> I was out on jury duty last week so am still trying to catch up on =
email,
> >> but I did have a chance to review the framework document and type =
up
> >> my comments.  There's a lot of them so they're inline in the =
attached
> >> PDF.
> >>
> >> In addition, I have a couple of general comments:
> >>
> >> The definition of "IPv{4,6}-only" talks about "two application
> >> instances are capable of communicating using IPv{4,6}...", and
> >> the title of the document is Framework for IPv4/IPv6 Translation.
> >> This is all well and good, except that in reading it this time I =
realized
> >> the document today doesn't actually cover all of that.  =
Specifically
> >> what is missing is cases where there's an IPv{4,6}-only application
> >> running on a dual-stack (i.e. completely provisioned) host.  =
Section 1.5
> >> talks about connecting IPv{4,6} "networks".  This is sufficient =
only
> >> so long as you could define a single application instance as a =
"network"
> >> which seems a bit unintuitive.
> >>
> >> In my view, the framework really should be an overall framework for
> >> talking about the problems.  Doing translation in a host, for =
example,
> >> should be within the scope of the framework.
> >
> > I understood that the AD's guidance was to limit the scenarios
> > to the separate-translator-box cases that the draft covers. Won't we
> > complicate the discussion enormously by expanding the scope as you
> > describe?
> >
>=20
> I think the further discussion indicates that it is likely =
complicating
> things.

I don't understand that; translation in the host avoids
factors exacerbated by in-the-network translation such as
path MTU, fragmentation, ICMP black-holing, transport-
specific checksum conversion, etc. How would discussing
the in-the-host use case scenario complicate things?

Fred
fred.l.templin@boeing.com

> So far all discussion has been focused on the in the network
> translator model. I am not against separate documents discussing this
> use case, but lets try to avoid feature creep that results in extra =
delay.
>=20
> Cheers
>=20
> Magnus Westerlund
>=20
> IETF Transport Area Director & TSVWG Chair
> ----------------------------------------------------------------------
> Multimedia Technologies, Ericsson Research EAB/TVM
> ----------------------------------------------------------------------
> Ericsson AB                | Phone  +46 10 7148287
> F=E4r=F6gatan 6                | Mobile +46 73 0949079
> SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
> ----------------------------------------------------------------------
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From iljitsch@muada.com  Mon Apr 20 10:21:29 2009
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Cc: Behave WG , congxiao , Xing Li , Fred Baker , Dave Thaler 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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On 20 apr 2009, at 17:24, R=E9mi Despr=E9s wrote:

> 1's complement checksum neutrality imposes that the checksum of the =20=

> 2 IPv6 addresses be the same as that of the 2 v4 addresses.

> This creates a complex constraint on values of v6 address bits other =20=

> than those of embedded v4 addresses.

No, it doesn't. One set of addresses is always constant. Let's say =20
those are the source addresses. For the destination address, 96 bits =20
of the IPv6 address are also always constant. The remaining bits are =20
the IPv4 bits, which cancel out on both sides of the equation. So as =20
long as checksum(src v4 32 bits, src v6 128 bits, dst v6 96 bits) =3D 0 =20=

(or -0) we're in business. This is easily accomplised as follows:

[translator prefix/64][zeroes/16][X/16][IPv4/32]

Where X is the magic ingredient that makes the whole thing checksum to =20=

0.

> The choice seems to be between
> - freedom of IPv6 address format, with a necessary detection of =20
> whether transport is TCP, UDP.
> - right to ignore which transport is used (yet having to recognize =20
> ICMP), and impose for this constraints on Ipv6 addresses

> If the only expected IPv6 option is that of fragmentation, as =20
> assumed in the draft, detecting that transport is TCP or UDP is =20
> trivial, in both V6toV4 and V4toV6 directions.
> Avoiding this detection doesn't seem therefore a reasonable choice =20
> if the price paid is adding new constraints on IPv6 address formats.

Simply take advantage of the checksum neutralness if it's there. Then =20=

operators can decide whether they want or need this.

>> I believe this can be done, as shown by Margaret for NAT66

> Note that in Margaret's NAT66:
> - ISP prefixes MUST be "/48 or shorter"

That's because in that case the interface identifier must be =20
preserved. In this case, that doesn't apply.

> - Subnet numbers MUST be "non-0xFFFF".

Wrong choice, should be non-0x0000 because al zero bits is pretty much =20=

impossible to reach using the checksum calculation while all one bits =20=

is a common result.

> I hope you can share the view that these kind of restrictions create =20=

> a relationship between parts of the general architecture that makes =20=

> it more complex to understand and maintain.

No. Overspecify, underimplement. That works. The other way around =20
doesn't.

On 20 apr 2009, at 17:27, Keith Moore wrote:

> The "normal" transport layer checksum that has been in wide use for
> decades doesn't actually provide very much protection against packet
> corruption, in light of current-day e2e bandwidths and the tendency of
> applications to transfer more and more data.  So this argues for =20
> either
> doing away with the transport level checksum (as useless overhead)

No, it's the link layer checksums that are redundant, see end-to-end =20
principle.

> or having a more robust checksum.

Well, requiring that translators be able to rewrite checksums is the =20
fastest way to make sure that never happens. Note that we were luckier =20=

than we deserved to be by the fact that the simple checksum we use is =20=

incrementally updatable. I shudder to think of the situation where =20
NATs would have to rewrite CRC32s in TCP headers.

> I don't get your argument that the translation only needs to be =20
> computed
> once, because in a stateless translator there's no state kept between
> packets to allow the results of previous computations to be stored.

Oh right, you could determine these bits algorithmically for each =20
packet. You could also simply map the IPv4 address to the IPv6 address =20=

and use a few bytes more memory, depending what you have more of, =20
memory or CPU.

> Checksum-neutral mapping provides a
> useful benefit in some cases, but it does come at a cost.  Consider, =20=

> for
> example, a multihomed network using stateless v4-v6 NATs at its =20
> borders.
> With checksum-neutral mapping the relationship between internal and
> external addresses, and the relationship between different external
> addresses that map to the same internal address, is less obvious =20
> than if
> a different algorithm were used.

Well, if you go from v4 to v6 96 bits will have to come from =20
somewhere. I don't think this is a big deal, especially as address =20
management happens on human timescales and packet processing quite =20
possibly on nanosecond timescales. Also, non-translated hosts tend to =20=

use stateless autoconfig which isn't exactly easy on humans.

> So in summary: yes, it's a useful tool; no, it shouldn't be required
> everywhere.

I agree with that.=

From dwing@cisco.com  Mon Apr 20 18:25:32 2009
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From: "Dan Wing" 
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References: 	<67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org>	<49CB85A9.6090903@cernet.edu.cn><49CB9763.4060705@it.uc3m.es> <49CCDD7D.3000704@cernet.edu.cn><49CCE6F4.5020903@gmail.com> <49E30985.40101@it.uc3m.es><49E54E5A.2010006@gmail.com> <49E7C318.3070504@gmail.com>
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Cc: 'Behave WG' , 'Xing Li' , 'Fred Baker' , 'Hiroshi MIYATA' 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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> -----Original Message-----
> From: behave-bounces@ietf.org 
> [mailto:behave-bounces@ietf.org] On Behalf Of Brian E Carpenter
> Sent: Thursday, April 16, 2009 4:45 PM
> To: Iljitsch van Beijnum
> Cc: Xing Li; Behave WG; Fred Baker; Hiroshi MIYATA
> Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
> 
> Iljitsch,
> 
> On 2009-04-16 21:44, Iljitsch van Beijnum wrote:
> > On 15 apr 2009, at 5:02, Brian E Carpenter wrote:
> > 
> >> At least two bad things happen with 6to4 if the WKP is incorrectly
> >> advertised or filtered.
> > 
> >> 1. 2002::/16 is advertised too far - that is to say, A 
> advertises it
> >> to B,
> >> but the relay that A is operating has an ACL that drops 
> IPv6 packets from
> >> outside A. Users sending native IPv6 packets to a 6to4 
> destination via B
> >> will be sending them into a black hole. In this case, A 
> was wrong to
> >> export the prefix.
> > 
> >> 2. 2002::/16 is advertised too short - that is to say, A 
> advertises it
> >> to B,
> >> *and* is willing to relay IPv6 packets from B, but B drops 
> the route.
> >> Users
> >> sending native IPv6 packets to a 6to4 destination via B will get
> >> Destination
> >> Unreachable. In this case, B was wrong to filter the prefix.
> > 
> >> Actually, the correct solution is that every ISP offering 
> native IPv6
> >> service
> >> MUST either operate an inbound (to 6to4) relay or support 
> a 2002::/16
> >> route
> >> to such a relay, and MUST NOT advertise such a route to 
> other ISPs unless
> >> it is willing to accept all traffic.
> > 
> >> I'm sure similar problems would arise with a NAT64 WKP, if used
> >> carelessly.
> >> But I think Xing Li's analysis a few days ago was correct.
> > 
> > The big difference between the 6to4 prefix and a NAT64 
> well-known prefix
> > would be that the presence of 2002::/16 in the routing 
> tables throughout
> > the internet in some way is assumed, and trouble arises 
> when this prefix
> > can't be reached. With NAT64 there is no assumption (yet?) that each
> > IPv6 host can blindly assume the NAT64 exists.
> > 
> > Also, with 2002::/16 the prefix is advertised globally by a 
> good number
> > of people. With the NAT64 WKP this would presumably not happen, and
> > advertising it between ASes at all should probably be rare. 
> Basically,
> > 2002::/16 has global scope but the NAT64 WKP would have 
> ULA-like scope:
> > some exceptions are possible, but site scope is assumed.
> 
> I don't think we're in disagreement. The similarity with 2002::/16 is
> that if you mess up the scope of the advertisement, you end 
> up in trouble.
> Unfortunately, the practical evidence from 2002::/16 is that people do
> mess this up (and they mess up advertisement of 192.88.99.0/24 too).
> We should have put more operational rules into RFC3056 and RFC3068,
> and we need to have very clear operational rules for a NAT64 WKP.
> Especially if exceptions from strict site-only scope are allowed.

Are operational rules effective?

For example, let us imagine that we fast-tracked a BCP-track RFC that
encouraged Doing The Right Thing regarding advertising 2002::/16.  Twelve
months after publication -- sufficient time for the industry to internalize
that RFC -- would the RFC cause an measurable reduction in the number of
mis-advertised 2002::/16 routes?

-d


From brian.e.carpenter@gmail.com  Mon Apr 20 18:28:44 2009
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Date: Tue, 21 Apr 2009 13:30:04 +1200
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Cc: pierre.levis@orange-ftgroup.com, behave@ietf.org, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded address format	in	draft-baker-behave-v4v6-framework-02
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On 2009-04-18 06:52, marcelo bagnulo braun wrote:
> Fred Baker escribi=C3=B3:
>>> Did I miss something?
>>
>>
>> besides that an unroutable prefix makes translation a real pain in the=

>> network, which is why deployed translators (including both CERNET's
>> IVI and many NAT-PT deployments) use anything but the magic prefix
>> model that this working group so strongly likes?
> maybe the reason why current NATPT doesn't use the WK prefix it is
> beacuse the WK prefix was not defined before and the NATPT spec ony
> defined the use of the now called LIR prefix?

Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
Actually it says you can use whatever you want. Of course, SIIT is very
clear that IPv4-mapped prefixes should never appear in IPv6 routing.

   Brian

>> No, nothing at all.
>>
>> On Apr 17, 2009, at 2:30 AM,  wrote:
>>
>>>
>>> Yes if we read RFC4291 this way:
>>> "For all unicast addresses, except those that start with the binary
>>> value 000, Interface IDs are required [...]to be constructed in
>>> Modified EUI-64 format."
>>> it should!
>>>
>>> But if we read RFC4291 that way:
>>> "Interface identifiers in IPv6 unicast addresses are used to identify=

>>> interfaces on a link. They are required to be unique within a subnet
>>> prefix."
>>> "For all unicast addresses, except those that start with the binary
>>> value 000, Interface IDs are required [...] to be 64 bits long"
>>> That means too:
>>> A v4v6 address  with the IPv4 address
>>> that crosses the 64-bit boundary should be interpreted as:
>>>  is the Network Prefix, it is 64-bit long
>>>  is the IID, it is 64-bit long, it identifies an
>>> interface, and it is unique within 
>>> Which is obviously not the case here!
>>>
>>> So, as far as I understand, if we want to fully follow RFC4291, the
>>> only possibility is that Prefix is a IANA prefix, and that it begins
>>> with 000
>>>
>>> Did I miss something?
>>>
>>> Pierre
>>>
>>> -----Message d'origine-----
>>> De : Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>>> Envoy=C3=A9 : vendredi 17 avril 2009 01:52
>>> =C3=80 : LEVIS Pierre RD-CORE-CAE
>>> Objet : Re: [BEHAVE] Question on embedded address format in
>>> draft-baker-behave-v4v6-framework-02
>>>
>>> On 2009-04-17 00:17, pierre.levis@orange-ftgroup.com wrote:
>>> ...
>>>> If we look at RFC4291, we see that even if v4v6 addresses are indeed=

>>>> unicast addresses, they are not really in the scope, this 64-bit
>>>> boundary does not really make sense here:
>>>> "Interface identifiers in IPv6 unicast addresses are used to
>>>> identify interfaces on a link. They are required to be unique within=

>>>> a subnet prefix."
>>>> "For all unicast addresses, except those that start with the binary
>>>> value 000, Interface IDs are required to be 64 bits long and to be
>>>> constructed in Modified EUI-64 format."
>>>>
>>>> Thus, extension of prefixes beyond /64 can be done freely, without
>>>> concern with a rule for links where subnet prefixes are /64.
>>>>
>>>> So, I tend to agree that for v4v6 addresses we should not care of
>>>> this Modified EUI-64 format.
>>>
>>> For addresses that start with binary 000 only. But for anything under=

>>> an LIR prefix,
>>> the EUI-64 requirement applies.
>>>
>>>   Brian
>>> _______________________________________________
>>> Behave mailing list
>>> Behave@ietf.org
>>> https://www.ietf.org/mailman/listinfo/behave
>>
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>>
>=20
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
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From brian.e.carpenter@gmail.com  Mon Apr 20 18:33:50 2009
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Cc: 'Behave WG' , 'Xing Li' , 'Fred Baker' , 'Hiroshi MIYATA' 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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On 2009-04-21 13:26, Dan Wing wrote:
...
> Are operational rules effective?
> 
> For example, let us imagine that we fast-tracked a BCP-track RFC that
> encouraged Doing The Right Thing regarding advertising 2002::/16.  Twelve
> months after publication -- sufficient time for the industry to internalize
> that RFC -- would the RFC cause an measurable reduction in the number of
> mis-advertised 2002::/16 routes?

I think a couple of paragraphs in the relevant O'Reilly book might have more
impact. Bad habits that result from oversights in RFCs are hard to break
by writing more RFCs.

So, I think we need to be sure that the IPv4/IPv6 translation documents
contain the best possible operational advice we can come up with.

    Brian

From dwing@cisco.com  Mon Apr 20 18:47:23 2009
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Cc: 'Behave WG' , 'Xing Li' , 'Fred Baker' , 'Hiroshi MIYATA' 
Subject: Re: [BEHAVE] Plan for IPv4/IPv6 translation documents
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> On 2009-04-21 13:26, Dan Wing wrote:
> ...
> > Are operational rules effective?
> > 
> > For example, let us imagine that we fast-tracked a 
> BCP-track RFC that
> > encouraged Doing The Right Thing regarding advertising 
> 2002::/16.  Twelve
> > months after publication -- sufficient time for the 
> industry to internalize
> > that RFC -- would the RFC cause an measurable reduction in 
> the number of
> > mis-advertised 2002::/16 routes?
> 
> I think a couple of paragraphs in the relevant O'Reilly book 
> might have more
> impact. Bad habits that result from oversights in RFCs are 
> hard to break
> by writing more RFCs.
> 
> So, I think we need to be sure that the IPv4/IPv6 translation 
> documents
> contain the best possible operational advice we can come up with.

My real question is:

Does the risk (of black hole routes being created) outweigh
the benefit of a Well Known prefix.

-d


From marcelo@it.uc3m.es  Tue Apr 21 01:02:28 2009
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Cc: pierre.levis@orange-ftgroup.com, behave@ietf.org, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded address format	in	draft-baker-behave-v4v6-framework-02
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Brian E Carpenter escribió:
> On 2009-04-18 06:52, marcelo bagnulo braun wrote:
>   
>> Fred Baker escribió:
>>     
>>>> Did I miss something?
>>>>         
>>> besides that an unroutable prefix makes translation a real pain in the
>>> network, which is why deployed translators (including both CERNET's
>>> IVI and many NAT-PT deployments) use anything but the magic prefix
>>> model that this working group so strongly likes?
>>>       
>> maybe the reason why current NATPT doesn't use the WK prefix it is
>> beacuse the WK prefix was not defined before and the NATPT spec ony
>> defined the use of the now called LIR prefix?
>>     
>
> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
> Actually it says you can use whatever you want. Of course, SIIT is very
> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>
>   

but according to our tests, IPv6 implementations never use this prefix 
on the wire, it is only used to represent IPv4 addresses as IPv6 for 
issues internal to the host (like comparing v4 and v6 addresses in the 
rfc3484 selection rules)

so, if you ask a node to send a packet to this address, it will send an 
IPv4 packet if it can, and if not, it won't send anything (i.e. it will 
never use this address in the wire)

So, this prefix doesn't really works for NATPT, since, the hosts will 
never generate an IPv6 packet with this prefix.

Regards, marcelo


>    Brian
>
>   
>>> No, nothing at all.
>>>
>>> On Apr 17, 2009, at 2:30 AM,  wrote:
>>>
>>>       
>>>> Yes if we read RFC4291 this way:
>>>> "For all unicast addresses, except those that start with the binary
>>>> value 000, Interface IDs are required [...]to be constructed in
>>>> Modified EUI-64 format."
>>>> it should!
>>>>
>>>> But if we read RFC4291 that way:
>>>> "Interface identifiers in IPv6 unicast addresses are used to identify
>>>> interfaces on a link. They are required to be unique within a subnet
>>>> prefix."
>>>> "For all unicast addresses, except those that start with the binary
>>>> value 000, Interface IDs are required [...] to be 64 bits long"
>>>> That means too:
>>>> A v4v6 address  with the IPv4 address
>>>> that crosses the 64-bit boundary should be interpreted as:
>>>>  is the Network Prefix, it is 64-bit long
>>>>  is the IID, it is 64-bit long, it identifies an
>>>> interface, and it is unique within 
>>>> Which is obviously not the case here!
>>>>
>>>> So, as far as I understand, if we want to fully follow RFC4291, the
>>>> only possibility is that Prefix is a IANA prefix, and that it begins
>>>> with 000
>>>>
>>>> Did I miss something?
>>>>
>>>> Pierre
>>>>
>>>> -----Message d'origine-----
>>>> De : Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>>>> Envoyé : vendredi 17 avril 2009 01:52
>>>> À : LEVIS Pierre RD-CORE-CAE
>>>> Objet : Re: [BEHAVE] Question on embedded address format in
>>>> draft-baker-behave-v4v6-framework-02
>>>>
>>>> On 2009-04-17 00:17, pierre.levis@orange-ftgroup.com wrote:
>>>> ...
>>>>         
>>>>> If we look at RFC4291, we see that even if v4v6 addresses are indeed
>>>>> unicast addresses, they are not really in the scope, this 64-bit
>>>>> boundary does not really make sense here:
>>>>> "Interface identifiers in IPv6 unicast addresses are used to
>>>>> identify interfaces on a link. They are required to be unique within
>>>>> a subnet prefix."
>>>>> "For all unicast addresses, except those that start with the binary
>>>>> value 000, Interface IDs are required to be 64 bits long and to be
>>>>> constructed in Modified EUI-64 format."
>>>>>
>>>>> Thus, extension of prefixes beyond /64 can be done freely, without
>>>>> concern with a rule for links where subnet prefixes are /64.
>>>>>
>>>>> So, I tend to agree that for v4v6 addresses we should not care of
>>>>> this Modified EUI-64 format.
>>>>>           
>>>> For addresses that start with binary 000 only. But for anything under
>>>> an LIR prefix,
>>>> the EUI-64 requirement applies.
>>>>
>>>>   Brian
>>>> _______________________________________________
>>>> Behave mailing list
>>>> Behave@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/behave
>>>>         
>>> _______________________________________________
>>> Behave mailing list
>>> Behave@ietf.org
>>> https://www.ietf.org/mailman/listinfo/behave
>>>
>>>       
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
>>
>>     
>
>
>   


From magnus.westerlund@ericsson.com  Tue Apr 21 05:06:34 2009
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Cc: congxiao , Behave WG , Dave Thaler , Xing Li , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-framework-02
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Templin, Fred L skrev:
>>>
>> I think the further discussion indicates that it is likely complicating
>> things.
> 
> I don't understand that; translation in the host avoids
> factors exacerbated by in-the-network translation such as
> path MTU, fragmentation, ICMP black-holing, transport-
> specific checksum conversion, etc. How would discussing
> the in-the-host use case scenario complicate things?
> 

I might not have been clear. Yes, from a technical stand point is has
its merits with some specific limitations on when it is possible  to use
and the issue with deployment.

>From a standardization work point is does complicate things. I am fine
with some overview positioning of the solution in respect to the network
based solutions. However, it is additional work for a use case that
until now has not been discussed. Unless there is a clear consensus that
this should be done with equal or higher priority than what is already
being worked on I do suggest that we put it on substantial lower priority.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  +46 10 7148287
Färögatan 6                | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
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From remi.despres@free.fr  Tue Apr 21 06:16:12 2009
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Cc: congxiao , Behave WG , Keith Moore , Dave Thaler , Xing Li , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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Iljitsch van Beijnum  -  le (m/j/a) 4/20/09 7:20 PM:
> On 20 apr 2009, at 17:24, Rémi Després wrote:
> 
>> 1's complement checksum neutrality imposes that the checksum of the 2 
>> IPv6 addresses be the same as that of the 2 v4 addresses.
> 
>> This creates a complex constraint on values of v6 address bits other 
>> than those of embedded v4 addresses.
> 
> No, it doesn't.

Well, I agree that the word complex, which is subjective, could have 
been avoided. (But the fact that there is a constraint remains.)

> One set of addresses is always constant. Let's say those 
> are the source addresses. For the destination address, 96 bits of the 
> IPv6 address are also always constant. The remaining bits are the IPv4 
> bits, which cancel out on both sides of the equation. So as long as 
> checksum(src v4 32 bits, src v6 128 bits, dst v6 96 bits) = 0 (or -0) 
> we're in business. This is easily accomplised as follows:
> 
> [translator prefix/64][zeroes/16][X/16][IPv4/32]
> 
> Where X is the magic ingredient that makes the whole thing checksum to 0.

I fully agree with Dave's point made in a previous email:
" As discussed in the WG meeting, I believe this document should be 
independent of the mechanism used to choose the source/dest addresses to 
put into a translated header. This doc shouldn't require updating if 
another mechanism is added in the future, and it should be sufficient to 
apply to SIIT, BIS, NAT64, SAM, IVI, etc. "

Draft-xli-behave-ivi-01 in its sec. 5.1 is open to an evolution where 
port-extended IPv4 addresses are embedded in IPv6 addresses. The 
assumption of 96 constant bits will no longer hold if and when, for 
example, this is done.

>> The choice seems to be between
>> - freedom of IPv6 address format, with a necessary detection of 
>> whether transport is TCP, UDP.
>> - right to ignore which transport is used (yet having to recognize 
>> ICMP), and impose for this constraints on Ipv6 addresses
> 
>> If the only expected IPv6 option is that of fragmentation, as assumed 
>> in the draft, detecting that transport is TCP or UDP is trivial, in 
>> both V6toV4 and V4toV6 directions.
>> Avoiding this detection doesn't seem therefore a reasonable choice if 
>> the price paid is adding new constraints on IPv6 address formats.

> Simply take advantage of the checksum neutralness if it's there. Then 
> operators can decide whether they want or need this.
> 
>>> I believe this can be done, as shown by Margaret for NAT66
> 
>> Note that in Margaret's NAT66:
>> - ISP prefixes MUST be "/48 or shorter"
> 
> That's because in that case the interface identifier must be preserved. 
> In this case, that doesn't apply.

True. (But the fact remains.)


>> - Subnet numbers MUST be "non-0xFFFF".
> 
> Wrong choice, should be non-0x0000 because al zero bits is pretty much 
> impossible to reach using the checksum calculation while all one bits is 
> a common result.

Doesn't this remark show that there is some level of complexity in the 
constraints we are discussing.

(Also, would you agree that "pretty much impossible" is not a simple 
concept :-)?)

> 
>> I hope you can share the view that these kind of restrictions create a 
>> relationship between parts of the general architecture that makes it 
>> more complex to understand and maintain.


One more point:

RFC 2765 on SIIT, and the draft we comment, both say:
    "When a translator receives an unfragmented UDP IPv4 packet and the
    checksum field is zero the translator MUST compute the missing UDP
    checksum as part of translating the packet."

This rule (unavoidable because UDP null checksums, which are permitted 
in IPv4, are forbidden in IPv6 ), shows that in the case of IPv4/IPv6 
checksum neutrality is not completely feasible at the IP layer (even if 
IPv6 addresses have a favorable format for this).

Regards,

RD










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Cc: Behave WG , congxiao , Xing Li , Dave Thaler 
Subject: Re: [BEHAVE] The case for keeping UDP-TCP checksum updates in the v4v6 translation draft
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On Apr 20, 2009, at 8:24 AM, R=E9mi Despr=E9s wrote:

> This creates a complex constraint on values of v6 address bits other =20=

> than those of embedded v4 addresses.

yes, it does. I'm hoping I will hear an algorithm here for an LIR =20
prefix.=

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Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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On Apr 20, 2009, at 10:20 AM, Iljitsch van Beijnum wrote:

> [translator prefix/64][zeroes/16][X/16][IPv4/32]
>
> Where X is the magic ingredient that makes the whole thing checksum  
> to 0.

So the host and the router in front of it have to recognize the type  
of address? The whole point is to do this in a manner that requires as  
few host changes as possible, I had thought.

From remi.despres@free.fr  Tue Apr 21 07:19:51 2009
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Subject: Re: [BEHAVE] Question on embedded address	format	in	draft-baker-behave-v4v6-framework-02
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Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:

> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
> Actually it says you can use whatever you want. Of course, SIIT is very
> clear that IPv4-mapped prefixes should never appear in IPv6 routing.


In January 2008, there was a v6ops discussion on the subject, but AFAIK 
without conclusion.

IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6 
embedded addresses: it already exists, and has all what is needed.

In my understanding, none of the reasons discussed in "IPv4-Mapped 
Addresses on the Wire Considered Harmful" applies to use cases of NAT64s.

(This is of course NOT to say that a /96 WKP should be the ONLY way to 
map an IPv4 address in an IPv6 address. Many other can exist, in 
particular with port-extended IPv4 addresses, with SAM etc.)

Regards,

RD

From moore@network-heretics.com  Tue Apr 21 07:24:10 2009
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Cc: pierre.levis@orange-ftgroup.com, behave@ietf.org, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després wrote:
> Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:
> 
>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
>> Actually it says you can use whatever you want. Of course, SIIT is very
>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
> 
> 
> In January 2008, there was a v6ops discussion on the subject, but AFAIK
> without conclusion.
> 
> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6
> embedded addresses: it already exists, and has all what is needed.

Disagree.  That prefix was specifically NOT intended to ever be used on
the wire.

> In my understanding, none of the reasons discussed in "IPv4-Mapped
> Addresses on the Wire Considered Harmful" applies to use cases of NAT64s.

It really doesn't matter.  That decision was made long ago.  There's too
much deployed code out there now that assumes that these addresses
should not be used on the wire.

IMO, we'd be better off without any WKP than to try to use that one.

Keith

From remi.despres@free.fr  Tue Apr 21 07:46:09 2009
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Cc: pierre.levis@orange-ftgroup.com, behave@ietf.org, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Keith,

I haven't when and where the

Keith Moore  -  le (m/j/a) 4/21/09 4:25 PM:
> Rémi Després wrote:
>> Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:
>>
>>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>>> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
>>> Actually it says you can use whatever you want. Of course, SIIT is very
>>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>>
>> In January 2008, there was a v6ops discussion on the subject, but AFAIK
>> without conclusion.
>>
>> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6
>> embedded addresses: it already exists, and has all what is needed.
> 
> Disagree.
> That prefix was specifically NOT intended to ever be used on
> the wire.

Sure, when it was specified, but then dual stack was the rule, and NAT64 
not even at the horizon.

>> In my understanding, none of the reasons discussed in "IPv4-Mapped
>> Addresses on the Wire Considered Harmful" applies to use cases of NAT64s.
> 
> It really doesn't matter.
Different view.

>  That decision was made long ago. 
Pointing to the RFC that says it would help.

> There's too
> much deployed code out there now that assumes that these addresses
> should not be used on the wire.
Could you be more specific?
(Which code, and serving which purpose?)
> 
> IMO, we'd be better off without any WKP than to try to use that one.
Different view so far.
We need explicit and good reasons to have 2 values where 1 appears to be 
enough.


Regards,
RD

From marcelo@it.uc3m.es  Tue Apr 21 08:23:29 2009
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Cc: behave@ietf.org, pierre.levis@orange-ftgroup.com, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:
>
>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
>> Actually it says you can use whatever you want. Of course, SIIT is very
>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>
>
> In January 2008, there was a v6ops discussion on the subject, but 
> AFAIK without conclusion.
>
> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6 
> embedded addresses: it already exists, and has all what is needed.
the problem is that current IPv6 implementations do use this prefix in 
the wire, so if they receive a synthetic AAAA RR with this prefix they 
will send an IPv4 packet if they can but they will NOt send an IPv6 
packet with that prefix in the destination address. so this is a non 
starter for this reason.

It would be possible to use the IPv4 compatible prefix, but, the problem 
if we use that is that with current rfc3484 default policy table, the 
translated connectivity is preferred over the native v4 connecitivty, 
which is an issue

hence, imho it is better to use a new prefix for this

regards, marcelo


>
> In my understanding, none of the reasons discussed in "IPv4-Mapped 
> Addresses on the Wire Considered Harmful" applies to use cases of NAT64s.
>
> (This is of course NOT to say that a /96 WKP should be the ONLY way to 
> map an IPv4 address in an IPv6 address. Many other can exist, in 
> particular with port-extended IPv4 addresses, with SAM etc.)
>
> Regards,
>
> RD
>


From marcelo@it.uc3m.es  Tue Apr 21 08:25:18 2009
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Cc: pierre.levis@orange-ftgroup.com, Fred Baker , behave@ietf.org
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Keith Moore escribió:
> Rémi Després wrote:
>   
>> Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:
>>
>>     
>>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>>> if I ever saw one. NAT-PT says nothing to forbid using it as the PREFIX.
>>> Actually it says you can use whatever you want. Of course, SIIT is very
>>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>>>       
>> In January 2008, there was a v6ops discussion on the subject, but AFAIK
>> without conclusion.
>>
>> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6
>> embedded addresses: it already exists, and has all what is needed.
>>     
>
> Disagree.  That prefix was specifically NOT intended to ever be used on
> the wire.
>
>   
>> In my understanding, none of the reasons discussed in "IPv4-Mapped
>> Addresses on the Wire Considered Harmful" applies to use cases of NAT64s.
>>     
>
> It really doesn't matter.  That decision was made long ago.  There's too
> much deployed code out there now that assumes that these addresses
> should not be used on the wire.
>   
agree

we tested it and implementation do not send IPv6 packet with this 
prefix, so this is a non starter

we need a new prefix allocated by iana
if we ask for a prefix, we can get a prefix so that the longest prefix 
match rule in rfc3484 help us to preffer nartive connectivity over 
translated connectivity.


regards, marcelo


From marcelo@it.uc3m.es  Tue Apr 21 08:28:22 2009
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Cc: behave@ietf.org, pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> Keith,
>
> I haven't when and where the
>
> Keith Moore  -  le (m/j/a) 4/21/09 4:25 PM:
>> Rémi Després wrote:
>>> Brian E Carpenter  -  le (m/j/a) 4/21/09 3:30 AM:
>>>
>>>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>>>> if I ever saw one. NAT-PT says nothing to forbid using it as the 
>>>> PREFIX.
>>>> Actually it says you can use whatever you want. Of course, SIIT is 
>>>> very
>>>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>>>
>>> In January 2008, there was a v6ops discussion on the subject, but AFAIK
>>> without conclusion.
>>>
>>> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6
>>> embedded addresses: it already exists, and has all what is needed.
>>
>> Disagree.
>> That prefix was specifically NOT intended to ever be used on
>> the wire.
>
> Sure, when it was specified, but then dual stack was the rule, and 
> NAT64 not even at the horizon.
>
>>> In my understanding, none of the reasons discussed in "IPv4-Mapped
>>> Addresses on the Wire Considered Harmful" applies to use cases of 
>>> NAT64s.
>>
>> It really doesn't matter.
> Different view.
>
>>  That decision was made long ago. 
> Pointing to the RFC that says it would help.
>
>> There's too
>> much deployed code out there now that assumes that these addresses
>> should not be used on the wire.
> Could you be more specific?
> (Which code, and serving which purpose?)
we tried windows (several flavors) linux and a couple of nokia phones.

the result always the same, no IPv6 packets generated using that prefix

regards, marcelo


>>
>> IMO, we'd be better off without any WKP than to try to use that one.
> Different view so far.
> We need explicit and good reasons to have 2 values where 1 appears to 
> be enough.
>
>
> Regards,
> RD
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>


From dwing@cisco.com  Tue Apr 21 08:29:28 2009
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Cc: 'Dave Thaler' 
Subject: [BEHAVE] FW: [Dime] Confirming HUM regardingdraft-brockners-diameter-nat-control-00.txt
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Many people in the BEHAVE WG are probably interested in this document.  

Please indicate your support/objection on the DIME mailing list,
https://www.ietf.org/mailman/listinfo/dime

-d


-----Original Message-----
From: dime-bounces@ietf.org [mailto:dime-bounces@ietf.org] On Behalf Of Hannes
Tschofenig
Sent: Monday, April 13, 2009 12:35 PM
To: dime@ietf.org
Subject: [Dime] Confirming HUM
regardingdraft-brockners-diameter-nat-control-00.txt

Hi all, 

at the IETF#74 DIME meeting we had a presentation about the "Diameter NAT
Control Application" document:
http://www.ietf.org/internet-drafts/draft-brockners-diameter-nat-control-00.
txt

The group was in favor of turning this document into a working group item. 

If you have objections or if you weren't at the meeting and would like to
express your support for it please let us know by the 24th April 2009. 

Ciao
Hannes & Dave 

_______________________________________________
DiME mailing list
DiME@ietf.org
https://www.ietf.org/mailman/listinfo/dime


From iljitsch@muada.com  Tue Apr 21 09:05:18 2009
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Cc: congxiao , Behave WG , Keith Moore , Dave Thaler , Xing Li , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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Let's short-circuit this discussion before it spins any further out of  
control...

This issue is that the current translation draft doesn't address the  
checksum issue in enough detail.

What happens with DCCP?

What about unknown protocols which may or may not use the normal  
checksum?

I think if the document goes forward, it should mention this issue and  
specify how unknown protocols are to be handled. Which would be: pass  
them along unmodified.

Also, I would very much like to see mentioned, even if it's only one  
sentence, that if the opertor chooses the IPv6 address that maps to  
the IPv6 source address such that it and the translator prefix  
together checksum to 0, protocols that use the normal checksum, but  
the translator doesn't know how to adjust the checksum for, can  
successfully be translated.

From moore@network-heretics.com  Tue Apr 21 11:47:48 2009
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Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després wrote:

> We need explicit and good reasons to have 2 values where 1 appears to be
> enough.

No, we need explicit and good reasons to change the addressing
architecture.  None have been given.

From remi.despres@free.fr  Wed Apr 22 00:07:28 2009
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Cc: pierre.levis@orange-ftgroup.com, behave@ietf.org, Fred Baker 
Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Keith Moore  -  le (m/j/a) 4/21/09 8:48 PM:
> Rémi Després wrote:
> 
>> We need explicit and good reasons to have 2 values where 1 appears to be
>> enough.
> 
> No,
I suppose you don't really mean NO to this statement?


> we need explicit and good reasons to change the addressing
> architecture.
YES.

> None have been given.

None has been given BECAUSE it is not clear, so far, that if we use the 
existing well known prefix ::FFFF:0:0/96 of IPv4 mapped addresses, 
rather than defining a new one, any RFC is offended.

Pointing to an existing rule that forbids to use this prefix on the wire 
(if  it exists) would help clarifying this debate.

Regards,

RD

From iljitsch@muada.com  Wed Apr 22 01:30:19 2009
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Cc: behave@ietf.org, pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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On 22 apr 2009, at 9:08, R=E9mi Despr=E9s wrote:

> None has been given BECAUSE it is not clear, so far, that if we use =20=

> the existing well known prefix ::FFFF:0:0/96 of IPv4 mapped =20
> addresses, rather than defining a new one, any RFC is offended.

Well then, why don't we simply deprecate RFC 791 and point people =20
towards RFC 2460 and the whole mess is solved?

Oh wait, that's not operationally feasible?=

From marcelo@it.uc3m.es  Wed Apr 22 01:51:28 2009
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Cc: behave@ietf.org, pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> Keith Moore  -  le (m/j/a) 4/21/09 8:48 PM:
>> Rémi Després wrote:
>>
>>> We need explicit and good reasons to have 2 values where 1 appears 
>>> to be
>>> enough.
>>
>> No,
> I suppose you don't really mean NO to this statement?
>
>
>> we need explicit and good reasons to change the addressing
>> architecture.
> YES.
>
>> None have been given.
>
> None has been given BECAUSE it is not clear, so far, that if we use 
> the existing well known prefix ::FFFF:0:0/96 of IPv4 mapped addresses, 
> rather than defining a new one, any RFC is offended.
>
> Pointing to an existing rule that forbids to use this prefix on the 
> wire (if  it exists) would help clarifying this debate.

sigh, let me try one more time
We tried to use this prefix in current implementations and they do not 
use this prefix in the wire.
If we use this prefix we need to change the implementations, beating one 
of the key goals, which is to support unchanged IPv6 hosts

So, it is a non starter, really.

(BTW, we took the trouble of testing this because we would have liked 
very much to be able to use it, but unfortunatelly, we can't)

Regards, marcelo


>
> Regards,
>
> RD
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From remi.despres@free.fr  Wed Apr 22 06:14:48 2009
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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marcelo bagnulo braun  -  le (m/j/a) 4/22/09 10:52 AM:

> Rémi Després escribió:
>> it is not clear, so far, that if we use 
>> the existing well known prefix ::FFFF:0:0/96 of IPv4 mapped addresses, 
>> rather than defining a new one, any RFC is offended.
>>
>> Pointing to an existing rule that forbids to use this prefix on the 
>> wire (if  it exists) would help clarifying this debate.
> 
> sigh, let me try one more time
> We tried to use this prefix in current implementations and they do not 
> use this prefix in the wire.
> If we use this prefix we need to change the implementations, beating one 
> of the key goals, which is to support unchanged IPv6 hosts
> 
> So, it is a non starter, really.
> 
> (BTW, we took the trouble of testing this because we would have liked 
> very much to be able to use it, but unfortunatelly, we can't)

OK, I get the point that tests you made showed that at least current 
implementations you tested couldn't work with the mapped address prefix 
used to reach NAT64s.

I also get the point that, with a different WKP, there would have been a 
very good chance that these same implementations could have worked.

The short term and easy conclusion seems then to be the definition of a 
new WKP.
But ALL CONSEQUENCES of having two ways to do essentially the same thing 
have to be anticipated.

Here is an example of a POSSIBLE PROBLEM (there may be others):
- An application that is both IPv4 and IPv6 capable is run in an 
IPv6-only host.
- It gets an A RR in response to a DNS query (obtained in IPv6).
- Then it presents the received IPv4 address at its PF_INET6 socket 
interface in mapped format, conforming in this to RFC2553 sec 3.7.
- If the stack is not capable to forward IPv6 packets with this 
destination address, connectivity is lost.

Of course, applications could be changed, e.g. to detect the lost 
connectivity and next try the other WKP, but is this to be suggested 
rather than fixing IPv6 stacks?

Please be sure that this discussion is not just for the sake of arguing. 
I may be wrong in this particular case, but I believe there may be 
significant operational consequences ahead when an existing 
specification, without being deprecated, is proposed to coexist with a 
new one to do the same thing.

Regards,

RD

From marcelo@it.uc3m.es  Wed Apr 22 06:34:56 2009
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From: marcelo bagnulo braun 
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> marcelo bagnulo braun  -  le (m/j/a) 4/22/09 10:52 AM:
>
>> Rémi Després escribió:
>>> it is not clear, so far, that if we use the existing well known 
>>> prefix ::FFFF:0:0/96 of IPv4 mapped addresses, rather than defining 
>>> a new one, any RFC is offended.
>>>
>>> Pointing to an existing rule that forbids to use this prefix on the 
>>> wire (if  it exists) would help clarifying this debate.
>>
>> sigh, let me try one more time
>> We tried to use this prefix in current implementations and they do 
>> not use this prefix in the wire.
>> If we use this prefix we need to change the implementations, beating 
>> one of the key goals, which is to support unchanged IPv6 hosts
>>
>> So, it is a non starter, really.
>>
>> (BTW, we took the trouble of testing this because we would have liked 
>> very much to be able to use it, but unfortunatelly, we can't)
>
> OK, I get the point that tests you made showed that at least current 
> implementations you tested couldn't work with the mapped address 
> prefix used to reach NAT64s.
>
> I also get the point that, with a different WKP, there would have been 
> a very good chance that these same implementations could have worked.
>

good!
> The short term and easy conclusion seems then to be the definition of 
> a new WKP.
> But ALL CONSEQUENCES of having two ways to do essentially the same 
> thing have to be anticipated.
>
i certainly agree with that

> Here is an example of a POSSIBLE PROBLEM (there may be others):
> - An application that is both IPv4 and IPv6 capable is run in an 
> IPv6-only host.
> - It gets an A RR in response to a DNS query (obtained in IPv6).
> - Then it presents the received IPv4 address at its PF_INET6 socket 
> interface in mapped format, conforming in this to RFC2553 sec 3.7.
> - If the stack is not capable to forward IPv6 packets with this 
> destination address, connectivity is lost.
>
right, so what is the problem? I mean, in ths scenario it seems we have 
an IPv6 only host that is trying to communicate to an IPv4 only host and 
hast no NAT64 available (it there were, it would had received a 
synthetic AAAA RR containing either the WK prefix or the LIR prefix 
being used by the nat64 box and the communication would have been 
established)

So, i am missing why is this a problem if there is a nat64 and if there 
is a nat64 what are the problems that srping from having the WK prefix 
being different from the IPv4 mapped prefix (i am sure you had something 
in mind, just not clear to me from this example you provided)

> Of course, applications could be changed, e.g. to detect the lost 
> connectivity and next try the other WKP, but is this to be suggested 
> rather than fixing IPv6 stacks?
>
no, we asume that in ortder to make this work, we need to use a dns64

> Please be sure that this discussion is not just for the sake of arguing
i know
i certainly don't think so

> . I may be wrong in this particular case, but I believe there may be 
> significant operational consequences ahead when an existing 
> specification, without being deprecated, is proposed to coexist with a 
> new one to do the same thing.
>
but they are not doing the same thing, since the v4 mapped is not 
supposed to be in the wire.
I  don't know if there is any rfc that says so, but this is the current 
practice.

Regards, marcelo


> Regards,
>
> RD
>


From marcelo@it.uc3m.es  Wed Apr 22 07:17:07 2009
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Subject: [BEHAVE] silently discarding packets?
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Hi,

One of the comments we received form Greg on the NAT64 draft is about 
whether the NAT64 should send ICMP error messages when discarding 
packets for which it doesn't have a binding for.

The current draft reads:

     If the packet arrived on the IPv4 interface and the NAT64
     filters on its IPv4 interface, then the NAT64 checks to see if
     the incoming packet is allowed according to the
     address-dependent filtering rule. To do this, it searches for
     a session table entry with a source IPv4 transport address
     equal to the destination IPv4 transport address in the incoming
     5-tuple and destination IPv4 address (in the session table entry)
     equal to the source IPv4 address in the incoming 5-tuple.
     If such an entry
     is found (there may be more than one), packet processing
     continues. Otherwise, the packet is discarded. If the packet
     is discarded, then an ICMP message SHOULD be sent to the
     original sender of the packet, unless the discarded packet is
     itself an ICMP message. The ICMP message, if sent, has a type
     of 3 (Destination Unreachable) and a code of 13 (Communication
     Administratively Prohibited).

According to Greg, most implementations silently drop the packet in thsi 
case.
I was thinking to downgrade it to a MAY... what people think?

Thanks, marcelo



From iljitsch@muada.com  Wed Apr 22 07:30:16 2009
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To: marcelo bagnulo braun 
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Subject: Re: [BEHAVE] silently discarding packets?
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On 22 apr 2009, at 16:18, marcelo bagnulo braun wrote:

>    itself an ICMP message. The ICMP message, if sent, has a type
>    of 3 (Destination Unreachable) and a code of 13 (Communication
>    Administratively Prohibited).

Wouldn't a TCP reset or port unreachable make more sense?

> According to Greg, most implementations silently drop the packet in  
> thsi case.
> I was thinking to downgrade it to a MAY... what people think?

In the case where there was a mapping but it timed out sending back a  
message that will get the other side to update its state would be  
helpful, IMO.

From marcelo@it.uc3m.es  Wed Apr 22 07:43:31 2009
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Subject: Re: [BEHAVE] silently discarding packets?
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Iljitsch van Beijnum escribió:
> On 22 apr 2009, at 16:18, marcelo bagnulo braun wrote:
>
>>    itself an ICMP message. The ICMP message, if sent, has a type
>>    of 3 (Destination Unreachable) and a code of 13 (Communication
>>    Administratively Prohibited).
>
> Wouldn't a TCP reset or port unreachable make more sense?

ok, sorry if i didn't gave enough background
Let me try again.

This was for UDP and for a packet coming from the IPv4 interface.
If the packet is coming form the IPv6 interface, we would send

The type should be 3
          (Destination Unreachable) and the code should be 0 (Network
          Unreachable in IPv4, and No Route to Destination in IPv6).

For TCP is still work in progress

>
>> According to Greg, most implementations silently drop the packet in 
>> thsi case.
>> I was thinking to downgrade it to a MAY... what people think?
>
> In the case where there was a mapping but it timed out sending back a 
> message that will get the other side to update its state would be 
> helpful, IMO.
>


From iljitsch@muada.com  Wed Apr 22 08:28:55 2009
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On 22 apr 2009, at 16:44, marcelo bagnulo braun wrote:

>>>   itself an ICMP message. The ICMP message, if sent, has a type
>>>   of 3 (Destination Unreachable) and a code of 13 (Communication
>>>   Administratively Prohibited).

>> Wouldn't a TCP reset or port unreachable make more sense?

> ok, sorry if i didn't gave enough background
> Let me try again.

> This was for UDP and for a packet coming from the IPv4 interface.
> If the packet is coming form the IPv6 interface, we would send

> The type should be 3
>         (Destination Unreachable) and the code should be 0 (Network
>         Unreachable in IPv4, and No Route to Destination in IPv6).

Well, what I said still applies: if there was previously data flowing  
but the translator removed the state, it's helpful to the IPv4 host to  
get a reset in the form of a port unreachable:

Type    Name                                              Reference
----    -------------------------                         ---------
   3     Destination Unreachable                           [RFC792]

	Codes
              3  Port Unreachable                           [RFC792]

From remi.despres@free.fr  Wed Apr 22 10:11:51 2009
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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marcelo bagnulo braun  -  le (m/j/a) 4/22/09 3:36 PM:
> Rémi Després escribió:

>> Here is an example of a POSSIBLE PROBLEM (there may be others):
>> - An application that is both IPv4 and IPv6 capable is run in an 
>> IPv6-only host.
>> - It gets an A RR in response to a DNS query (obtained in IPv6).
>> - Then it presents the received IPv4 address at its PF_INET6 socket 
>> interface in mapped format, conforming in this to RFC2553 sec 3.7.
>> - If the stack is not capable to forward IPv6 packets with this 
>> destination address, connectivity is lost.
>>
> right, so what is the problem? I mean, in ths scenario it seems we have 
> an IPv6 only host that is trying to communicate to an IPv4 only host and 
> hast no NAT64 available (it there were, it would had received a 
> synthetic AAAA RR containing either the WK prefix or the LIR prefix 
> being used by the nat64 box and the communication would have been 
> established)
> 
> So, i am missing why is this a problem if there is a nat64 and if there 
> is a nat64 what are the problems that srping from having the WK prefix 
> being different from the IPv4 mapped prefix (i am sure you had something 
> in mind, just not clear to me from this example you provided)

OK, I understand the answer and, after the comment below, have no plan 
to  insist.

In my understanding, the following constraints result from the fact that 
IPv4 mapped addresses have been artificially excluded from valid 
destinations in IPv6-only environments:
- IPv6-only hosts MUST send ONLY recursive queries (as most host do, but 
so far without being obliged to).
- If these queries are not sent directly to DNS64 servers at 
v6only-v4only borders, intermediate servers MUST:
   . NOT be in dual stack clouds (there, they should not loose the 
ability to respond with As).
   . NOT handle recursive queries by themselves (although they typically 
do it)
   . instead, forward recursive queries to a v4-v6 border server, or to 
  intermediate servers having the same constraints.

These may not be the exact constraints, but should be close to reality.


If on the contrary mapped addresses would not have been artificially 
barred, and would have remained the ONLY way to express a v4 address in 
v6 format:
- The constraint above on DNSs would have not been needed.
- IPv4-only servers would have become accessible via NAT64s by IPv6-only 
applications, and by dual-stack applications in v6-only hosts, just by 
having their mapped addresses in AAAA RRs in their local DNSs.
- Compatibility between on the fly RR translations and DNSsec would NOT 
have been a problem.


Well, the past is the past, that's life :-(.

To be optimistic, that's one more reason to make IPv6 deployment 
everywhere as rapid as possible ;-).

Regards,

RD

From rpenno@juniper.net  Wed Apr 22 11:52:09 2009
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From: Reinaldo Penno 
To: marcelo bagnulo braun , Iljitsch van Beijnum 
Date: Wed, 22 Apr 2009 14:48:53 -0400
Thread-Topic: [BEHAVE] silently discarding packets?
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Cc: Behave WG , "Gregory M. Lebovitz" 
Subject: Re: [BEHAVE] silently discarding packets?
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Hello Marcelo,

I believe a 'MAY' is appropriate.  Otherwise it seems to me a security issu=
e since if somebody does not get an ICMP back, it knows there is a binding =
and if there is no binding, it makes the device have to send ICMP packets b=
ack.

Thanks,

Reinaldo


On 4/22/09 7:44 AM, "marcelo bagnulo braun"  wrote:

Iljitsch van Beijnum escribi=F3:
> On 22 apr 2009, at 16:18, marcelo bagnulo braun wrote:
>
>>    itself an ICMP message. The ICMP message, if sent, has a type
>>    of 3 (Destination Unreachable) and a code of 13 (Communication
>>    Administratively Prohibited).
>
> Wouldn't a TCP reset or port unreachable make more sense?

ok, sorry if i didn't gave enough background
Let me try again.

This was for UDP and for a packet coming from the IPv4 interface.
If the packet is coming form the IPv6 interface, we would send

The type should be 3
          (Destination Unreachable) and the code should be 0 (Network
          Unreachable in IPv4, and No Route to Destination in IPv6).

For TCP is still work in progress

>
>> According to Greg, most implementations silently drop the packet in
>> thsi case.
>> I was thinking to downgrade it to a MAY... what people think?
>
> In the case where there was a mapping but it timed out sending back a
> message that will get the other side to update its state would be
> helpful, IMO.
>

_______________________________________________
Behave mailing list
Behave@ietf.org
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From marcelo@it.uc3m.es  Wed Apr 22 12:25:10 2009
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> marcelo bagnulo braun  -  le (m/j/a) 4/22/09 3:36 PM:
>> Rémi Després escribió:
>
>>> Here is an example of a POSSIBLE PROBLEM (there may be others):
>>> - An application that is both IPv4 and IPv6 capable is run in an 
>>> IPv6-only host.
>>> - It gets an A RR in response to a DNS query (obtained in IPv6).
>>> - Then it presents the received IPv4 address at its PF_INET6 socket 
>>> interface in mapped format, conforming in this to RFC2553 sec 3.7.
>>> - If the stack is not capable to forward IPv6 packets with this 
>>> destination address, connectivity is lost.
>>>
>> right, so what is the problem? I mean, in ths scenario it seems we 
>> have an IPv6 only host that is trying to communicate to an IPv4 only 
>> host and hast no NAT64 available (it there were, it would had 
>> received a synthetic AAAA RR containing either the WK prefix or the 
>> LIR prefix being used by the nat64 box and the communication would 
>> have been established)
>>
>> So, i am missing why is this a problem if there is a nat64 and if 
>> there is a nat64 what are the problems that srping from having the WK 
>> prefix being different from the IPv4 mapped prefix (i am sure you had 
>> something in mind, just not clear to me from this example you provided)
>
> OK, I understand the answer and, after the comment below, have no plan 
> to  insist.
>
> In my understanding, the following constraints result from the fact 
> that IPv4 mapped addresses have been artificially excluded from valid 
> destinations in IPv6-only environments:
> - IPv6-only hosts MUST send ONLY recursive queries (as most host do, 
> but so far without being obliged to).
well, they can implement DNS64 in the local resolver, in whcih case they 
can do non recursive and synthesis locally (that requires host changes 
indeed)


> - If these queries are not sent directly to DNS64 servers at 
> v6only-v4only borders, intermediate servers MUST:
>   . NOT be in dual stack clouds (there, they should not loose the 
> ability to respond with As).
don't understnad this one,could you expand?

>   . NOT handle recursive queries by themselves (although they 
> typically do it)
not sure what scenario do you have in mind... areyou talking about a dns 
server running in a v6 only machine? If so, why it cannot handle 
recursive lookups? cause the lack of native v4 transport? If so why this 
is related to DNS64?

>
>   . instead, forward recursive queries to a v4-v6 border server, or to 
>  intermediate servers having the same constraints.
>
> These may not be the exact constraints, but should be close to reality.
>
>
> If on the contrary mapped addresses would not have been artificially 
> barred, and would have remained the ONLY way to express a v4 address 
> in v6 format:
> - The constraint above on DNSs would have not been needed.
> - IPv4-only servers would have become accessible via NAT64s by 
> IPv6-only applications, and by dual-stack applications in v6-only 
> hosts, just by having their mapped addresses in AAAA RRs in their 
> local DNSs.
> - Compatibility between on the fly RR translations and DNSsec would 
> NOT have been a problem.
>
i think i agree with the last two at least
but i think this was possible world that turns out not to be the one we 
are currently living (in other words, it would have been cool to have 
that, but we don't, i guess)

>
> Well, the past is the past, that's life :-(.
>
ditto

Regards, marcelo
> To be optimistic, that's one more reason to make IPv6 deployment 
> everywhere as rapid as possible ;-).
>
> Regards,
>
> RD
>


From dthaler@windows.microsoft.com  Wed Apr 22 14:02:33 2009
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From: Dave Thaler 
To: marcelo bagnulo braun , Behave WG , "Gregory M. Lebovitz" 
Date: Wed, 22 Apr 2009 14:03:16 -0700
Thread-Topic: [BEHAVE] silently discarding packets?
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I think the choice of MAY vs SHOULD should not be made simply
on the basis of what most implementations do, but rather on
what we think the right thing is.  (If it's a MAY or a SHOULD
and implementations don't do it, they're still compliant.)

I'd say the NAT64 component SHOULD do it, but that a firewall
(whether on the same box or not) might block it.

-Dave

> -----Original Message-----
> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> Behalf Of marcelo bagnulo braun
> Sent: Wednesday, April 22, 2009 7:18 AM
> To: Behave WG; Gregory M. Lebovitz
> Subject: [BEHAVE] silently discarding packets?
>
> Hi,
>
> One of the comments we received form Greg on the NAT64 draft is about
> whether the NAT64 should send ICMP error messages when discarding
> packets for which it doesn't have a binding for.
>
> The current draft reads:
>
>      If the packet arrived on the IPv4 interface and the NAT64
>      filters on its IPv4 interface, then the NAT64 checks to see if
>      the incoming packet is allowed according to the
>      address-dependent filtering rule. To do this, it searches for
>      a session table entry with a source IPv4 transport address
>      equal to the destination IPv4 transport address in the incoming
>      5-tuple and destination IPv4 address (in the session table entry)
>      equal to the source IPv4 address in the incoming 5-tuple.
>      If such an entry
>      is found (there may be more than one), packet processing
>      continues. Otherwise, the packet is discarded. If the packet
>      is discarded, then an ICMP message SHOULD be sent to the
>      original sender of the packet, unless the discarded packet is
>      itself an ICMP message. The ICMP message, if sent, has a type
>      of 3 (Destination Unreachable) and a code of 13 (Communication
>      Administratively Prohibited).
>
> According to Greg, most implementations silently drop the packet in
> thsi
> case.
> I was thinking to downgrade it to a MAY... what people think?
>
> Thanks, marcelo
>
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave


From brian.e.carpenter@gmail.com  Wed Apr 22 15:09:41 2009
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Date: Thu, 23 Apr 2009 10:10:54 +1200
From: Brian E Carpenter 
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Cc: "Gregory M. Lebovitz" , Behave WG 
Subject: Re: [BEHAVE] silently discarding packets?
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For sure you can't rely on it because of firewalls, but
otoh it could be extremely useful for diagnostics when
things go wrong.

I'd go for SHOULD, but MUST be possible to configure on or off.

   Brian

On 2009-04-23 09:03, Dave Thaler wrote:
> I think the choice of MAY vs SHOULD should not be made simply
> on the basis of what most implementations do, but rather on
> what we think the right thing is.  (If it's a MAY or a SHOULD
> and implementations don't do it, they're still compliant.)
> 
> I'd say the NAT64 component SHOULD do it, but that a firewall
> (whether on the same box or not) might block it.
> 
> -Dave
> 
>> -----Original Message-----
>> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
>> Behalf Of marcelo bagnulo braun
>> Sent: Wednesday, April 22, 2009 7:18 AM
>> To: Behave WG; Gregory M. Lebovitz
>> Subject: [BEHAVE] silently discarding packets?
>>
>> Hi,
>>
>> One of the comments we received form Greg on the NAT64 draft is about
>> whether the NAT64 should send ICMP error messages when discarding
>> packets for which it doesn't have a binding for.
>>
>> The current draft reads:
>>
>>      If the packet arrived on the IPv4 interface and the NAT64
>>      filters on its IPv4 interface, then the NAT64 checks to see if
>>      the incoming packet is allowed according to the
>>      address-dependent filtering rule. To do this, it searches for
>>      a session table entry with a source IPv4 transport address
>>      equal to the destination IPv4 transport address in the incoming
>>      5-tuple and destination IPv4 address (in the session table entry)
>>      equal to the source IPv4 address in the incoming 5-tuple.
>>      If such an entry
>>      is found (there may be more than one), packet processing
>>      continues. Otherwise, the packet is discarded. If the packet
>>      is discarded, then an ICMP message SHOULD be sent to the
>>      original sender of the packet, unless the discarded packet is
>>      itself an ICMP message. The ICMP message, if sent, has a type
>>      of 3 (Destination Unreachable) and a code of 13 (Communication
>>      Administratively Prohibited).
>>
>> According to Greg, most implementations silently drop the packet in
>> thsi
>> case.
>> I was thinking to downgrade it to a MAY... what people think?
>>
>> Thanks, marcelo
>>
>>
>> _______________________________________________
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/listinfo/behave
> 
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
> 

From fred@cisco.com  Wed Apr 22 21:14:56 2009
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Cc: "Gregory M. Lebovitz" , Behave WG 
Subject: Re: [BEHAVE] silently discarding packets?
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On Apr 22, 2009, at 7:18 AM, marcelo bagnulo braun wrote:

> According to Greg, most implementations silently drop the packet in  
> thsi case.
> I was thinking to downgrade it to a MAY... what people think?

I think I would agree with that. Such packets may be part of an  
attack, of which the ICMP packets may be an amplification of the  
attack. Hence, I would think that it should be configurable whether  
they are responded to or not.

From huitema@windows.microsoft.com  Wed Apr 22 21:32:46 2009
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From: Christian Huitema 
To: Fred Baker , marcelo bagnulo braun 
Date: Wed, 22 Apr 2009 21:34:01 -0700
Thread-Topic: [BEHAVE] silently discarding packets?
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Subject: Re: [BEHAVE] silently discarding packets?
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> I think I would agree with that. Such packets may be part of an
> attack, of which the ICMP packets may be an amplification of the
> attack. Hence, I would think that it should be configurable whether
> they are responded to or not.

We could try fight this battle with firewall vendors, tell them to not sile=
ntly discard packets, but please don't have much hope. They will make the g=
eneral argument about stealth: it is generally safer to not respond to pack=
ets that you are not expected. We may choose to keep huffing and puffing fo=
r some time, but my guess is that in the end the brick wall will still be s=
tanding.

If you think about it some more, the firewall guys really have a point. Our=
 protocols should really not depend on error messages coming back, and spec=
ifically not on error messages that cannot be authenticated. The same RST t=
hat indicates that a port is closed could also be used by an attacker to tr=
ick unsuspected host in believing that a port is closed. Do we really want =
to put up a fight to ensure RST attack are still possible?

-- Christian Huitema



From iljitsch@muada.com  Wed Apr 22 23:16:20 2009
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On 23 apr 2009, at 6:16, Fred Baker wrote:

>> According to Greg, most implementations silently drop the packet in  
>> thsi case.
>> I was thinking to downgrade it to a MAY... what people think?

> I think I would agree with that. Such packets may be part of an  
> attack, of which the ICMP packets may be an amplification of the  
> attack. Hence, I would think that it should be configurable whether  
> they are responded to or not.

If an attacker sends packets and then gets ICMP port unreachables (or  
TCP resets) back, how does that help the attacker?

Someone said the attacker could use this to observe whether a mapping  
exists, but since a mapping only exists if there were packets to/from  
the address used by the attacker fairly recently anyway, the attacker  
would already know.

I.e., if 11.11.11.11 has a session through the NAT64 using ports 80  
and 1025, and then 99.99.99.99 sends a packet witch ports 80 and 1025,  
the NAT64 would always send an error to 99.99.99.99 so an off-path  
attacker wouldn't be able to find out any information.

This whole "ICMP is scary" business is nonsense, we have ICMP for a  
reason, we should use it like intended.

About firewalls: it's a firewalls business to break RFCs, so whatever  
we write in an RFC a firewall vendor isn't going to care. This isn't  
about firewalls, this is about translation devices.

From rpenno@juniper.net  Thu Apr 23 00:47:47 2009
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From: Reinaldo Penno 
To: Iljitsch van Beijnum , Fred Baker 
Date: Thu, 23 Apr 2009 03:48:40 -0400
Thread-Topic: [BEHAVE] silently discarding packets?
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Cc: "Gregory M. Lebovitz" , Behave WG 
Subject: Re: [BEHAVE] silently discarding packets?
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I was basing my assertions on the following REQs from the ICMP BEHAVE RFC.

  REQ-4: If a NAT device receives an ICMP Error packet from an external
          realm, and the NAT device does not have an active mapping for
          the embedded payload, the NAT SHOULD silently drop the ICMP
          Error packet.  If the NAT has active mapping for the embedded
          payload, then the NAT MUST do the following prior to
          forwarding the packet, unless explicitly overridden by local
          policy:

  REQ-9: A NAT device MAY implement a policy control that prevents ICMP
          messages being generated toward certain interface(s).
          Implementation of such a policy control overrides the MUSTs
          and SHOULDs in REQ-10.

The above seems to capture what some people were expressing about silently =
drop and policy control.

On 4/22/09 11:16 PM, "Iljitsch van Beijnum"  wrote:

On 23 apr 2009, at 6:16, Fred Baker wrote:

>> According to Greg, most implementations silently drop the packet in
>> thsi case.
>> I was thinking to downgrade it to a MAY... what people think?

> I think I would agree with that. Such packets may be part of an
> attack, of which the ICMP packets may be an amplification of the
> attack. Hence, I would think that it should be configurable whether
> they are responded to or not.

If an attacker sends packets and then gets ICMP port unreachables (or
TCP resets) back, how does that help the attacker?

Someone said the attacker could use this to observe whether a mapping
exists, but since a mapping only exists if there were packets to/from
the address used by the attacker fairly recently anyway, the attacker
would already know.

I.e., if 11.11.11.11 has a session through the NAT64 using ports 80
and 1025, and then 99.99.99.99 sends a packet witch ports 80 and 1025,
the NAT64 would always send an error to 99.99.99.99 so an off-path
attacker wouldn't be able to find out any information.

This whole "ICMP is scary" business is nonsense, we have ICMP for a
reason, we should use it like intended.

About firewalls: it's a firewalls business to break RFCs, so whatever
we write in an RFC a firewall vendor isn't going to care. This isn't
about firewalls, this is about translation devices.
_______________________________________________
Behave mailing list
Behave@ietf.org
https://www.ietf.org/mailman/listinfo/behave


From marcelo@it.uc3m.es  Thu Apr 23 00:57:16 2009
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Subject: Re: [BEHAVE] silently discarding packets?
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So, what i am reading is that most of people think that there are valid 
(security) reasons not to send ICMP errors back.

What about the following (based on Brain's proposal)

    If the packet is discarded, then the NAT64 device SHOULD
    be able to send back an ICMP message  to the
    original sender of the packet, unless the discarded packet is
    itself an ICMP message. The ICMP message, if sent, has a type
    of 3 (Destination Unreachable) and a code of 13 (Communication
    Administratively Prohibited). The NAT64 device MUST allow to configure
    whether the ICMP error messages are sent or not.

how does this sounds?

Regards, marcelo


marcelo bagnulo braun escribió:
> Hi,
>
> One of the comments we received form Greg on the NAT64 draft is about 
> whether the NAT64 should send ICMP error messages when discarding 
> packets for which it doesn't have a binding for.
>
> The current draft reads:
>
>     If the packet arrived on the IPv4 interface and the NAT64
>     filters on its IPv4 interface, then the NAT64 checks to see if
>     the incoming packet is allowed according to the
>     address-dependent filtering rule. To do this, it searches for
>     a session table entry with a source IPv4 transport address
>     equal to the destination IPv4 transport address in the incoming
>     5-tuple and destination IPv4 address (in the session table entry)
>     equal to the source IPv4 address in the incoming 5-tuple.
>     If such an entry
>     is found (there may be more than one), packet processing
>     continues. Otherwise, the packet is discarded. If the packet
>     is discarded, then an ICMP message SHOULD be sent to the
>     original sender of the packet, unless the discarded packet is
>     itself an ICMP message. The ICMP message, if sent, has a type
>     of 3 (Destination Unreachable) and a code of 13 (Communication
>     Administratively Prohibited).
>
> According to Greg, most implementations silently drop the packet in 
> thsi case.
> I was thinking to downgrade it to a MAY... what people think?
>
> Thanks, marcelo
>
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>


From iljitsch@muada.com  Thu Apr 23 01:20:14 2009
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From: Iljitsch van Beijnum 
To: Reinaldo Penno 
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Cc: "Gregory M. Lebovitz" , Behave WG , Fred Baker 
Subject: Re: [BEHAVE] silently discarding packets?
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On 23 apr 2009, at 9:48, Reinaldo Penno wrote:

> I was basing my assertions on the following REQs from the ICMP  
> BEHAVE RFC.
>
>  REQ-4: If a NAT device receives an ICMP Error packet

> The above seems to capture what some people were expressing about  
> silently drop and policy control.

No it doesn't. The above just makes sure there are no ICMP messages  
sent for ICMP messages, in order to prevent "ICMP storms".

If people want to filter ICMP messages, that is stupid because they  
serve important functions (unreachables avoid lengthy application  
timeouts) but that's their business. It's not a NAT64's job to make  
that decision for other people, especially as we expect NAT64s to be  
deployed by ISPs.

> On 4/22/09 11:16 PM, "Iljitsch van Beijnum"   
> wrote:
> I.e., if 11.11.11.11 has a session through the NAT64 using ports 80
> and 1025, and then 99.99.99.99 sends a packet witch ports 80 and 1025,
> the NAT64 would always send an error to 99.99.99.99 so an off-path
> attacker wouldn't be able to find out any information.

Ok, that's not exactly how it works, I forgot to take endpoint  
independent behavior into account. So that means more packets match a  
mapping, but if there is no match we still need those ICMP messages.

On 23 apr 2009, at 9:58, marcelo bagnulo braun wrote:

> So, what i am reading is that most of people think that there are  
> valid (security) reasons not to send ICMP errors back.

Superstition isn't valid and it's only a (small) handful of people  
who've spoken up. If we want to break existing (without a translator)  
behavior we should at least have a decent consensus call.

>   If the packet is discarded, then the NAT64 device SHOULD
>   be able to send back an ICMP message  to the
>   original sender of the packet, unless the discarded packet is
>   itself an ICMP message.

Not able, it should simply do it.

>   The ICMP message, if sent, has a type
>   of 3 (Destination Unreachable) and a code of 13 (Communication
>   Administratively Prohibited).

No, it should be a port unreachable.

>   The NAT64 device MUST allow to configure
>   whether the ICMP error messages are sent or not.

I don't see any reason for this text, if operators want this they can  
ask their vendors for it. Interoperation isn't enhanced by including  
this as a must so there is no reason to include it.

From rpenno@juniper.net  Thu Apr 23 01:40:12 2009
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From: Reinaldo Penno 
To: Iljitsch van Beijnum 
Date: Thu, 23 Apr 2009 04:41:14 -0400
Thread-Topic: [BEHAVE] silently discarding packets?
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Subject: Re: [BEHAVE] silently discarding packets?
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Your comment was based on REQ-4 alone.

REQ-9 mention the issue of policy control overriding whether or not NAT
generates messages. So, NAT64 is not making the the decision one way or
another. It is configurable.


On 4/23/09 1:19 AM, "Iljitsch van Beijnum"  wrote:

>> I was basing my assertions on the following REQs from the ICMP
>> BEHAVE RFC.
>>=20
>>  REQ-4: If a NAT device receives an ICMP Error packet
>=20
>> The above seems to capture what some people were expressing about
>> silently drop and policy control.
>=20
> No it doesn't. The above just makes sure there are no ICMP messages
> sent for ICMP messages, in order to prevent "ICMP storms".
>=20
> If people want to filter ICMP messages, that is stupid because they
> serve important functions (unreachables avoid lengthy application
> timeouts) but that's their business. It's not a NAT64's job to make
> that decision for other people, especially as we expect NAT64s to be
> deployed by ISPs.


From remi.despres@free.fr  Thu Apr 23 02:19:28 2009
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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marcelo bagnulo braun  -  le (m/j/a) 4/22/09 9:26 PM:
> Rémi Després escribió:
>> In my understanding, the following constraints result from the fact 
>> that IPv4 mapped addresses have been artificially excluded from valid 
>> destinations in IPv6-only environments:
>> - IPv6-only hosts MUST send ONLY recursive queries (as most host do, 
>> but so far without being obliged to).
> well, they can implement DNS64 in the local resolver, in whcih case they 
> can do non recursive and synthesis locally (that requires host changes 
> indeed)
> 
>> - If these queries are not sent directly to DNS64 servers at 
>> v6only-v4only borders, intermediate servers MUST:
>>
>>   . NOT be in dual stack clouds (there, they should not loose the 
>> ability to respond with As).
> don't understnad this one,could you expand
> 
>>   . NOT handle recursive queries by themselves (although they 
>> typically do it)
> not sure what scenario do you have in mind... areyou talking about a dns 
> server running in a v6 only machine? If so, why it cannot handle 
> recursive lookups? cause the lack of native v4 transport? If so why this 
> is related to DNS64?

1.
I was assuming that the local DNS was not capable to do the translation.
But that may not be worth considering further.

The constraint is then limited to what has already been written, namely 
if I am right:
A. in the IPv6-network-to-IPv4-Internet case, hosts must send recursive 
queries ONLY to DNS64-capable DNS servers.
B. in the IPv6-Internet-to-an-IPv4-network case, "the DNS64 function is 
provided by the end site itself".

2.
BTW, if not done yet, and if I am not mistaken, it's worth noting that 
if DNSs of IPv4-only servers are populated, by hand or by other means, 
with AAAAs containing the agreed WKP and their IPv4 addresses (in 
addition to their As), then these servers become accessible via NAT64s 
*independently of DNS64-capable servers existing anywhere, and with 
IPsec compatibility*.

I don't see which harm a recommendation to do this could do, and the 
benefit can be quite substantial.

With it, agreeing on a WKP becomes even more urgent.

Regards,

RD


From marcelo@it.uc3m.es  Thu Apr 23 02:56:59 2009
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Cc: behave@ietf.org, Dave Thaler , pierre.levis@orange-ftgroup.com, Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Rémi Després escribió:
> marcelo bagnulo braun  -  le (m/j/a) 4/22/09 9:26 PM:
>> Rémi Després escribió:
>>> In my understanding, the following constraints result from the fact 
>>> that IPv4 mapped addresses have been artificially excluded from 
>>> valid destinations in IPv6-only environments:
>>> - IPv6-only hosts MUST send ONLY recursive queries (as most host do, 
>>> but so far without being obliged to).
>> well, they can implement DNS64 in the local resolver, in whcih case 
>> they can do non recursive and synthesis locally (that requires host 
>> changes indeed)
>>
>>> - If these queries are not sent directly to DNS64 servers at 
>>> v6only-v4only borders, intermediate servers MUST:
>>>
>>>   . NOT be in dual stack clouds (there, they should not loose the 
>>> ability to respond with As).
>> don't understnad this one,could you expand
>>
>>>   . NOT handle recursive queries by themselves (although they 
>>> typically do it)
>> not sure what scenario do you have in mind... areyou talking about a 
>> dns server running in a v6 only machine? If so, why it cannot handle 
>> recursive lookups? cause the lack of native v4 transport? If so why 
>> this is related to DNS64?
>
> 1.
> I was assuming that the local DNS was not capable to do the translation.
> But that may not be worth considering further.
>
> The constraint is then limited to what has already been written, 
> namely if I am right:
> A. in the IPv6-network-to-IPv4-Internet case, hosts must send 
> recursive queries ONLY to DNS64-capable DNS servers.
this works fine
i think it also works fine with DNS forwarders as long it ends up 
querying a dns64 capable recursive server wihtin the site
the main limitation as i see it, is that the dns64 and the nat64 must be 
operated by the same admin domain (or must coordiante the prefix64 they 
will use)

>
> B. in the IPv6-Internet-to-an-IPv4-network case, "the DNS64 function 
> is provided by the end site itself".
>
no, this case can works fine even wihtou a dns64 function (and this is 
the reccomended appraoch actually)
there is a lengthy description of this case in the dns64 draft

> 2.
> BTW, if not done yet, and if I am not mistaken, it's worth noting that 
> if DNSs of IPv4-only servers are populated, by hand or by other means, 
> with AAAAs containing the agreed WKP and their IPv4 addresses (in 
> addition to their As), then these servers become accessible via NAT64s 
> *independently of DNS64-capable servers existing anywhere,

right

> and with IPsec compatibility*.
>
i am not sure i understnad this one

> I don't see which harm a recommendation to do this could do, and the 
> benefit can be quite substantial.
>
> With it, agreeing on a WKP becomes even more urgent.
>
agree

Regards, marcelo


> Regards,
>
> RD
>
>


From brian.e.carpenter@gmail.com  Thu Apr 23 16:08:45 2009
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From: Brian E Carpenter 
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Cc: 'Behave WG' 
Subject: [BEHAVE] WKP risk [Re:  Plan for IPv4/IPv6 translation documents]
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Dan,

On 2009-04-21 13:48, Dan Wing wrote:
...
> My real question is:
> 
> Does the risk (of black hole routes being created) outweigh
> the benefit of a Well Known prefix.

Even after a lot of on- and off-list discussion, I have trouble
answering that question in the abstract.

If the exact rules for the WKP are such that only a flagrant
breach of a MUST or MUST NOT can cause a black hole, I would
agree to a WKP as an optional alternative to LIR. If we can't
make the WKP rules completely clear, we can't evaluate the risk.

   Brian

From marcelo@it.uc3m.es  Fri Apr 24 02:27:37 2009
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From: marcelo bagnulo braun 
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Cc: 'Behave WG' , Dan Wing 
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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Brian E Carpenter escribió:
> Dan,
>
> On 2009-04-21 13:48, Dan Wing wrote:
> ...
>   
>> My real question is:
>>
>> Does the risk (of black hole routes being created) outweigh
>> the benefit of a Well Known prefix.
>>     
>
> Even after a lot of on- and off-list discussion, I have trouble
> answering that question in the abstract.
>
> If the exact rules for the WKP are such that only a flagrant
> breach of a MUST or MUST NOT can cause a black hole, I would
> agree to a WKP as an optional alternative to LIR. If we can't
> make the WKP rules completely clear, we can't evaluate the risk.
>   

I thbk that if we want to be conservative and stay away from trouble, we 
can use a similar text to the one available in the ULA RFC (which is 
more restrictive than the one you sent for the 6to4)

Rephrasing it, it would look something like this:


   Addresses containing the WKP is designed to be routed inside of a site in
   the same manner as other types of unicast addresses.  They can be
   carried in any IPv6 routing protocol without any change.

   The default behavior of exterior routing protocol sessions between
   administrative routing regions must be to ignore receipt of and not
   advertise prefixes in the WKP block.  A network operator may
   specifically configure routes for the WKP for inter-site communication.

   If BGP is being used at the site border with an ISP, the default BGP
   configuration must filter out the WKP, both
   incoming and outgoing.  It must be set both to keep any WKP
   from being advertised outside of the site as well as
   to keep this prefixes from being learned from another site. 

Are these good for you?

Regards, marcelo


>    Brian
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>
>   


From remi.despres@free.fr  Fri Apr 24 08:04:57 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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Marcello,

Thanks for your answers.
This discussion has been clarifying and IMHO useful.

Some more comments, and answer to your question below.

Regards,

RD


marcelo bagnulo braun  -  le (m/j/a) 4/23/09 4:27 PM:
> Rémi Després escribió:
>> marcelo bagnulo braun  -  le (m/j/a) 4/23/09 11:58 AM:
>>> Rémi Després escribió:
>>
>>>> The constraint is then limited to what has already been written, 
>>>> namely if I am right:
>>>> A. in the IPv6-network-to-IPv4-Internet case, hosts must send 
>>>> recursive queries ONLY to DNS64-capable DNS servers.
>>> this works fine
>>> i think it also works fine with DNS forwarders as long it ends up 
>>> querying a dns64 capable recursive server wihtin the site
>>> the main limitation as i see it, is that the dns64 and the nat64 must 
>>> be operated by the same admin domain (or must coordiante the prefix64 
>>> they will use)
>>
>> Agreed.
>>
>>>> B. in the IPv6-Internet-to-an-IPv4-network case, "the DNS64 function 
>>>> is provided by the end site itself".
>>>>
>>> no, this case can works fine even wihtou a dns64 function (and this 
>>> is the reccomended appraoch actually)
>>> there is a lengthy description of this case in the dns64 draft
>>
>> OK.
>> I was confused by the overview section which says (asterisks added):
>>
>> "The other possible setup that is expected is an IPv4 site that
>>  wants that its IPv4 servers to be reachable from the IPv6
>>  Internet. (This case is called IPv6-Internet-to-an-IPv4-network).
>>  It should be noted that the IPv4 addresses used in the IPv4 site
>>  can be either public or private.  *In this case*, the NAT64 is used
>>  to connect the IPv4 end site to the IPv6 Internet and *the DNS64
>>  function is provided by the end site itself*."
>>
>> Some caveat would IMHO be appropriate here.
> right, this is a convoluted issue
> The reccomended approahc is that in this case, real AAAA RR are 
> published with the IPv6 representation of the IPv4 address.
> Howver, in order to support DynDNS, we may need to use dns64 to 
> dynamically create AAAA RR
> So, while it is not needed and not even reccomended. it may be used and 
> if used the dns64 function will be provided by the end site itself.
>>
>>
>> Also , the title of sec. 1.2.3 of the DNS64 draft could be clearer: 
>> being "IPv6-Internet-to-an-IPv4-network setup DNS64 in DNS server 
>> mode", it doesn't suggest that, as the section explains, no DNS64 is 
>> needed.
> 
> is not reccomended, but may be used to support some operational needs
> I will try to clarify this
>>
>> Note that in this section, the DNS server of the IPv4-only server is 
>> still presented as having to synthesize AAAAs (either when receiving 
>> DynDNS updates or when receiving AAAA queries), although it can also 
>> work without it for all hosts in which DynDNS clients would have been 
>> upgraded to also update AAAAs with the WKP when they update As.
>>
> right, this would be a third approach, indeed
> 
>> Upgrades of downloadable DynDNS client applications can of course be 
>> deployed much more rapidly than upgrades of DNS servers (and without 
>> conflicting  with them when also deployed).
>>
> mmm, good point, i agree with that
> 
>> What about adding a note explaining this in the draft?
>>
> yes that make sense to me, at least to also present the case (note that 
> it is not about dns64, but still, i agree it is worth including it)
> 
> I will be making a complete review of the dns64 draft shortly.
> 
>>>> 2.
>>>> BTW, if not done yet, and if I am not mistaken, it's worth noting 
>>>> that if DNSs of IPv4-only servers are populated, by hand or by other 
>>>> means, with AAAAs containing the agreed WKP and their IPv4 addresses 
>>>> (in addition to their As), then these servers become accessible via 
>>>> NAT64s *independently of DNS64-capable servers existing anywhere,
>>>
>>> right
>>>
>>>> and with IPsec compatibility*.
>>>>
>>> i am not sure i understnad this one
>>
>> OOPS, I meant "DNSsec compatibility" (sorry).
>>
> agree
> 
>> Sec. 1.2.3 of the DNS64 draft is close to cover this remark in the 
>> IPv6-Internet-to-an-IPv4-network case (cf comment above).
>>
>> It would IMHO be worth noting in the DNS64 draft that this remark also 
>> applies to the an-IPv6-network-to-IPv4-Internet case.
>>
>> (ALL IPv4-only servers for which AAAAs with the WKP are updated in 
>> their DNSs, e.g. by DynDNS clients upgraded for this, are reachable by 
>> ALL IPv6-only hosts having WKP routes to NAT64s on their paths toward 
>> the IPv4 Internet. This doesn't depend on any DNS64 upgrade having 
>> been done in any DNS server).
>>
> right
> i don't know if i want to go there, not at least until we have the WK 
> prefix defined.

IMHO, this remark is by itself an INCENTIVE to have a WKP asap. As soon 
there is one defined, DynDNS clients of IPv4-only servers can be 
upgraded to produce synthetic AAAAs and send them to existing DNS 
servers. The end result is that these servers become immediately 
accessible by IPv6-only clients whose NAT64s are configured with this 
prefix.

I am not sure about the implications of what you propose
> (i think it would be good, but clearly there is much less control of the 
> deployment), espcially in the global routing

I don't see how this use case would have any implication on global 
routing: in my understanding, packets from IPv6-only sources reach their 
NAT64s via routes to the rest of the world (::/0).
> 
> So, i would suggest we discuss this once we have managed to have a more 
> solid agreement on defining the WK prefix, makes sense?

Yes.
Let's then have this agreement quickly.


From dwing@cisco.com  Fri Apr 24 09:24:23 2009
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From: "Dan Wing" 
To: "'marcelo bagnulo braun'" , "'Brian E Carpenter'" 
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]=20
> Sent: Friday, April 24, 2009 2:29 AM
> To: Brian E Carpenter
> Cc: Dan Wing; 'Behave WG'
> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6=20
> translation documents]
>=20
> Brian E Carpenter escribi=F3:
> > Dan,
> >
> > On 2009-04-21 13:48, Dan Wing wrote:
> > ...
> >  =20
> >> My real question is:
> >>
> >> Does the risk (of black hole routes being created) outweigh
> >> the benefit of a Well Known prefix.
> >>    =20
> >
> > Even after a lot of on- and off-list discussion, I have trouble
> > answering that question in the abstract.
> >
> > If the exact rules for the WKP are such that only a flagrant
> > breach of a MUST or MUST NOT can cause a black hole, I would
> > agree to a WKP as an optional alternative to LIR. If we can't
> > make the WKP rules completely clear, we can't evaluate the risk.
> >  =20
>=20
> I thbk that if we want to be conservative and stay away from=20
> trouble, we=20
> can use a similar text to the one available in the ULA RFC (which is=20
> more restrictive than the one you sent for the 6to4)
>=20
> Rephrasing it, it would look something like this:
>=20
>=20
>    Addresses containing the WKP is designed to be routed=20
> inside of a site in
>    the same manner as other types of unicast addresses.  They can be
>    carried in any IPv6 routing protocol without any change.
                        ^
                     interior

>    The default behavior of exterior routing protocol sessions between
>    administrative routing regions must be to ignore receipt of and not
>    advertise prefixes in the WKP block.  A network operator may
>    specifically configure routes for the WKP for inter-site=20
> communication.
>=20
>    If BGP is being used at the site border with an ISP, the=20
> default BGP
>    configuration must filter out the WKP, both
>    incoming and outgoing.  It must be set both to keep any WKP
>    from being advertised outside of the site as well as
>    to keep this prefixes from being learned from another site.=20
>=20
> Are these good for you?

Second and third paragraph are somewhat redundant.

RFC2119 language would improve the text.

The text does seem to capture the WG consensus on WK prefix, and
this is certainly the safest recommendation at this point in time.

-d


> Regards, marcelo
>=20
>=20
> >    Brian
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
> >
> >  =20
>=20


From brian.e.carpenter@gmail.com  Fri Apr 24 13:48:31 2009
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Date: Sat, 25 Apr 2009 08:46:50 +1200
From: Brian E Carpenter 
Organization: University of Auckland
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To: Dan Wing 
References: 	<67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org>	<49CB85A9.6090903@cernet.edu.cn><49CB9763.4060705@it.uc3m.es>	<49CCDD7D.3000704@cernet.edu.cn><49CCE6F4.5020903@gmail.com>	<49E30985.40101@it.uc3m.es><49E54E5A.2010006@gmail.com>	<49E7C318.3070504@gmail.com>	<00a401c9c220$3b47c0f0$c5f0200a@cisco.com>	<49ED22D0.7030505@gmail.com>	<00a901c9c223$4ac15d40$c5f0200a@cisco.com> <49F0F546.4090503@gmail.com> <49F18655.2090104@it.uc3m.es> <012c01c9c4f9$4a839d10$c5f0200a@cisco.com>
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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I agree with Dan.

   Brian

On 2009-04-25 04:25, Dan Wing wrote:
>> -----Original Message-----
>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]=20
>> Sent: Friday, April 24, 2009 2:29 AM
>> To: Brian E Carpenter
>> Cc: Dan Wing; 'Behave WG'
>> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6=20
>> translation documents]
>>
>> Brian E Carpenter escribi=C3=B3:
>>> Dan,
>>>
>>> On 2009-04-21 13:48, Dan Wing wrote:
>>> ...
>>>  =20
>>>> My real question is:
>>>>
>>>> Does the risk (of black hole routes being created) outweigh
>>>> the benefit of a Well Known prefix.
>>>>    =20
>>> Even after a lot of on- and off-list discussion, I have trouble
>>> answering that question in the abstract.
>>>
>>> If the exact rules for the WKP are such that only a flagrant
>>> breach of a MUST or MUST NOT can cause a black hole, I would
>>> agree to a WKP as an optional alternative to LIR. If we can't
>>> make the WKP rules completely clear, we can't evaluate the risk.
>>>  =20
>> I thbk that if we want to be conservative and stay away from=20
>> trouble, we=20
>> can use a similar text to the one available in the ULA RFC (which is=20
>> more restrictive than the one you sent for the 6to4)
>>
>> Rephrasing it, it would look something like this:
>>
>>
>>    Addresses containing the WKP is designed to be routed=20
>> inside of a site in
>>    the same manner as other types of unicast addresses.  They can be
>>    carried in any IPv6 routing protocol without any change.
>                         ^
>                      interior
>=20
>>    The default behavior of exterior routing protocol sessions between
>>    administrative routing regions must be to ignore receipt of and not=

>>    advertise prefixes in the WKP block.  A network operator may
>>    specifically configure routes for the WKP for inter-site=20
>> communication.
>>
>>    If BGP is being used at the site border with an ISP, the=20
>> default BGP
>>    configuration must filter out the WKP, both
>>    incoming and outgoing.  It must be set both to keep any WKP
>>    from being advertised outside of the site as well as
>>    to keep this prefixes from being learned from another site.=20
>>
>> Are these good for you?
>=20
> Second and third paragraph are somewhat redundant.
>=20
> RFC2119 language would improve the text.
>=20
> The text does seem to capture the WG consensus on WK prefix, and
> this is certainly the safest recommendation at this point in time.
>=20
> -d
>=20
>=20
>> Regards, marcelo
>>
>>
>>>    Brian
>>> _______________________________________________
>>> Behave mailing list
>>> Behave@ietf.org
>>> https://www.ietf.org/mailman/listinfo/behave
>>>
>>>  =20
>=20
>=20


From Fred.L.Templin@boeing.com  Fri Apr 24 14:18:25 2009
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Thread-Topic: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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References: 	<67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org>	<49CB85A9.6090903@cernet.edu.cn><49CB9763.4060705@it.uc3m.es>	<49CCDD7D.3000704@cernet.edu.cn><49CCE6F4.5020903@gmail.com>	<49E30985.40101@it.uc3m.es><49E54E5A.2010006@gmail.com>	<49E7C318.3070504@gmail.com>	<00a401c9c220$3b47c0f0$c5f0200a@cisco.com>	<49ED22D0.7030505@gmail.com>	<00a901c9c223$4ac15d40$c5f0200a@cisco.com><49F0F546.4090503@gmail.com> <49F18655.2090104@it.uc3m.es><012c01c9c4f9$4a839d10$c5f0200a@cisco.com> <49F2253A.7050106@gmail.com>
From: "Templin, Fred L" 
To: "Brian E Carpenter" , "Dan Wing" 
X-OriginalArrivalTime: 24 Apr 2009 21:18:22.0769 (UTC) FILETIME=[32BEBA10:01C9C522]
Cc: Behave WG 
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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Just another thought on prefixes used for translation.
We already have a prefix form for intra-site tunneling:

  PREFIX:0x:00:5E:FE:V4ADDR
                  ^^

where "PREFIX" is a /64 prefix and "V4ADDR" is a 32-bit
IPv4 address. What if we were to define a corresponding
prefix form for intra-site *translation* as:

  PREFIX:0x:00:5E:FD:V4ADDR
                  ^^

This means that a single /64 could be assigned to a
tunneling-plus-translation interface, and the 'FE'
vs. 'FD' would tell the interface when to tunnel vs.
when to translate, respectively.

Comments?

Fred
fred.l.templin@boeing.com

> -----Original Message-----
> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
> Sent: Friday, April 24, 2009 1:47 PM
> To: Dan Wing
> Cc: 'Behave WG'
> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation =
documents]
>=20
> I agree with Dan.
>=20
>    Brian
>=20
> On 2009-04-25 04:25, Dan Wing wrote:
> >> -----Original Message-----
> >> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> >> Sent: Friday, April 24, 2009 2:29 AM
> >> To: Brian E Carpenter
> >> Cc: Dan Wing; 'Behave WG'
> >> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6
> >> translation documents]
> >>
> >> Brian E Carpenter escribi=F3:
> >>> Dan,
> >>>
> >>> On 2009-04-21 13:48, Dan Wing wrote:
> >>> ...
> >>>
> >>>> My real question is:
> >>>>
> >>>> Does the risk (of black hole routes being created) outweigh
> >>>> the benefit of a Well Known prefix.
> >>>>
> >>> Even after a lot of on- and off-list discussion, I have trouble
> >>> answering that question in the abstract.
> >>>
> >>> If the exact rules for the WKP are such that only a flagrant
> >>> breach of a MUST or MUST NOT can cause a black hole, I would
> >>> agree to a WKP as an optional alternative to LIR. If we can't
> >>> make the WKP rules completely clear, we can't evaluate the risk.
> >>>
> >> I thbk that if we want to be conservative and stay away from
> >> trouble, we
> >> can use a similar text to the one available in the ULA RFC (which =
is
> >> more restrictive than the one you sent for the 6to4)
> >>
> >> Rephrasing it, it would look something like this:
> >>
> >>
> >>    Addresses containing the WKP is designed to be routed
> >> inside of a site in
> >>    the same manner as other types of unicast addresses.  They can =
be
> >>    carried in any IPv6 routing protocol without any change.
> >                         ^
> >                      interior
> >
> >>    The default behavior of exterior routing protocol sessions =
between
> >>    administrative routing regions must be to ignore receipt of and =
not
> >>    advertise prefixes in the WKP block.  A network operator may
> >>    specifically configure routes for the WKP for inter-site
> >> communication.
> >>
> >>    If BGP is being used at the site border with an ISP, the
> >> default BGP
> >>    configuration must filter out the WKP, both
> >>    incoming and outgoing.  It must be set both to keep any WKP
> >>    from being advertised outside of the site as well as
> >>    to keep this prefixes from being learned from another site.
> >>
> >> Are these good for you?
> >
> > Second and third paragraph are somewhat redundant.
> >
> > RFC2119 language would improve the text.
> >
> > The text does seem to capture the WG consensus on WK prefix, and
> > this is certainly the safest recommendation at this point in time.
> >
> > -d
> >
> >
> >> Regards, marcelo
> >>
> >>
> >>>    Brian
> >>> _______________________________________________
> >>> Behave mailing list
> >>> Behave@ietf.org
> >>> https://www.ietf.org/mailman/listinfo/behave
> >>>
> >>>
> >
> >
>=20
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

From iljitsch@muada.com  Fri Apr 24 14:35:35 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] Question on	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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On 24 apr 2009, at 17:06, R=E9mi Despr=E9s wrote:

>> i don't know if i want to go there, not at least until we have the =20=

>> WK prefix defined.

> IMHO, this remark is by itself an INCENTIVE to have a WKP asap. As =20
> soon there is one defined, DynDNS clients of IPv4-only servers can =20
> be upgraded to produce synthetic AAAAs and send them to existing DNS =20=

> servers. The end result is that these servers become immediately =20
> accessible by IPv6-only clients whose NAT64s are configured with =20
> this prefix.

So you want to create synthetic AAAA records at the source (the =20
authoritative DNS server) and trust that there wil be a translator =20
somewhere that will provide connectivity for those AAAA addresses to =20
IPv6 hosts.

This is not a good idea. The translators aren't out there today, and =20
it's unlikely they're going to be universal any time soon.

And even if every IPv6 host were served by a translator, this would be =20=

problematic because now dual stack hosts will first try to connect to =20=

the synthetic AAAA address and only then to the real A address.

If people want to make their v4-only services available to IPv6-only =20
clients, what they should do is run their own translator locally (or =20
arrange to be served by someone else's translator) using global =20
unicast IPv6 addresses. Then the entire IPv6 internet will be able to =20=

connect to those services through that translator and there won't bre =20=

any problems.=

From dwing@cisco.com  Fri Apr 24 16:24:03 2009
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From: "Dan Wing" 
To: "'Iljitsch van Beijnum'" , "=?iso-8859-1?Q?'R=E9mi_Despr=E9s'?=" 
References: 	<01C41FE7-338B-4C26-BE6A-AD0119404276@cisco.com>	<49DC7354.8070305@free.fr>	<7E8115D0-C412-4A5F-9281-1C5C97868152@cisco.com>	<49DF5476.5030306@free.fr>		<49E7C48D.3020305@gmail.com>		<55CFDB58-ADD2-460E-9142-87F28E44506E@cisco.com>	<49E8CFD9.40904@it.uc3m.es>	<49ED219C.1070202@gmail.com>	<49EDD647.3060500@free.fr><49EDD750.1070502@network-heretics.com>	<49EDDC57.1060302@free.fr><49EE1507.9090306@network-heretics.com><49EEC270.7040607@free.fr> <49EEDADA.8040906@it.uc3m.es><49EF1888.5020302@free.fr> <49EF1D4B.5050300@it.uc3m.es><49EF5017.5030409@free.fr> <49EF6F5D.2010306@it.uc3m.es><49F032DE.3060604@free.fr> <49F03BB4.9050103@it.uc3m.es><49F074D4.2070006@free.fr> <49F07ACF.9000505@it.uc3m.es><49F1D55E.6000003@free.fr> <0C02E699-3F36-4C04-AEB8-59E78D49B827@muada.com>
Date: Fri, 24 Apr 2009 16:25:09 -0700
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Cc: 'Behave WG' 
Subject: Re: [BEHAVE] Questionon	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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> -----Original Message-----
> From: behave-bounces@ietf.org=20
> [mailto:behave-bounces@ietf.org] On Behalf Of Iljitsch van Beijnum
> Sent: Friday, April 24, 2009 2:36 PM
> To: R=E9mi Despr=E9s
> Cc: Behave WG
> Subject: Re: [BEHAVE] Questionon embedded address format in=20
> draft-baker-behave-v4v6-framework-02
>=20
> On 24 apr 2009, at 17:06, R=E9mi Despr=E9s wrote:
>=20
> >> i don't know if i want to go there, not at least until we=20
> have the =20
> >> WK prefix defined.
>=20
> > IMHO, this remark is by itself an INCENTIVE to have a WKP asap. As =20
> > soon there is one defined, DynDNS clients of IPv4-only servers can =20
> > be upgraded to produce synthetic AAAAs and send them to=20
> > existing DNS =20
> > servers. The end result is that these servers become immediately =20
> > accessible by IPv6-only clients whose NAT64s are configured with =20
> > this prefix.
>=20
> So you want to create synthetic AAAA records at the source (the =20
> authoritative DNS server) and trust that there wil be a translator =20
> somewhere that will provide connectivity for those AAAA addresses to =20
> IPv6 hosts.
>=20
> This is not a good idea. The translators aren't out there today, and =20
> it's unlikely they're going to be universal any time soon.
>=20
> And even if every IPv6 host were served by a translator, this=20
> would be =20
> problematic because now dual stack hosts will first try to=20
> connect to =20
> the synthetic AAAA address and only then to the real A address.
>=20
> If people want to make their v4-only services available to IPv6-only =20
> clients, what they should do is run their own translator locally (or =20
> arrange to be served by someone else's translator) using global =20
> unicast IPv6 addresses. Then the entire IPv6 internet will be=20
> able to connect to those services through that translator and=20
> there won't bre any problems.

That falls into the "well-known prefix causes harm" category.

I recall that one of the presentations at the Google IPv6=20
conference showed there were a lot of Teredo and 6to4
prefixes advertised in DNS.  If IANA assigns a well known=20
prefix for 6/4 translation, we should expect some people
will stick that prefix into their DNS records.  Perhaps
out of incompetence, perhaps while debugging or learning,=20
or perhaps because 'it works fine for my site that way'.

-d


From moore@network-heretics.com  Fri Apr 24 17:56:10 2009
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Date: Fri, 24 Apr 2009 20:56:43 -0400
From: Keith Moore 
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To: Dan Wing 
References: 	<01C41FE7-338B-4C26-BE6A-AD0119404276@cisco.com>	<49DC7354.8070305@free.fr>	<7E8115D0-C412-4A5F-9281-1C5C97868152@cisco.com>	<49DF5476.5030306@free.fr>		<49E7C48D.3020305@gmail.com>		<55CFDB58-ADD2-460E-9142-87F28E44506E@cisco.com>	<49E8CFD9.40904@it.uc3m.es>	<49ED219C.1070202@gmail.com>	<49EDD647.3060500@free.fr><49EDD750.1070502@network-heretics.com>	<49EDDC57.1060302@free.fr><49EE1507.9090306@network-heretics.com><49EEC270.7040607@free.fr>	<49EEDADA.8040906@it.uc3m.es><49EF1888.5020302@free.fr>	<49EF1D4B.5050300@it.uc3m.es><49EF5017.5030409@free.fr>	<49EF6F5D.2010306@it.uc3m.es><49F032DE.3060604@free.fr>	<49F03BB4.9050103@it.uc3m.es><49F074D4.2070006@free.fr>	<49F07ACF.9000505@it.uc3m.es><49F1D55E.6000003@free.fr>	<0C02E699-3F36-4C04-AEB8-59E78D49B827@muada.com> <02ca01c9c533$e8f14620$c5f0200a@cisco.com>
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Cc: =?ISO-8859-1?Q?=27R=E9mi?=, 'Behave WG' 
Subject: Re: [BEHAVE] Questionon	embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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> 
> That falls into the "well-known prefix causes harm" category.
> 
> I recall that one of the presentations at the Google IPv6 
> conference showed there were a lot of Teredo and 6to4
> prefixes advertised in DNS.  If IANA assigns a well known 
> prefix for 6/4 translation, we should expect some people
> will stick that prefix into their DNS records.  Perhaps
> out of incompetence, perhaps while debugging or learning, 
> or perhaps because 'it works fine for my site that way'.

I am becoming more and more convinced that a WKP for v4/v6 translation
is a Bad Idea.  That is, it is certain to cause harm, and it's hard to
see how it will actually be of any significant benefit.

Keith


From dthaler@windows.microsoft.com  Fri Apr 24 18:23:39 2009
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From: Dave Thaler 
To: "Templin, Fred L" , Brian E Carpenter , Dan Wing 
Date: Fri, 24 Apr 2009 18:24:57 -0700
Thread-Topic: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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References:  <67DFA2B0-AC2A-4E02-86B5-DDF30BB40CA1@tahi.org> <49CB85A9.6090903@cernet.edu.cn><49CB9763.4060705@it.uc3m.es> <49CCDD7D.3000704@cernet.edu.cn><49CCE6F4.5020903@gmail.com> <49E30985.40101@it.uc3m <49F18655.2090104@it.uc3m.es><012c01c9c4f9$4a839d10$c5f0200a@cisco.com> <49F2253A.7050106@gmail.com>, <39C363776A4E8C4A94691D2BD9D1C9A105DAE0B4@XCH-NW-7V2.nw.nos.boeing.com>
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Cc: Behave WG 
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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The choice to tunnel or not is really made based on the choice of
the /64 prefix, not the suffix per se.  The 5efe suffix really just
indicates that there's an embedded IPv4 address (and hence can
be used by things like an address-to-string converter).

________________________________________
From: behave-bounces@ietf.org [behave-bounces@ietf.org] On Behalf Of Templi=
n, Fred L [Fred.L.Templin@boeing.com]
Sent: Friday, April 24, 2009 2:18 PM
To: Brian E Carpenter; Dan Wing
Cc: Behave WG
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation document=
s]

Just another thought on prefixes used for translation.
We already have a prefix form for intra-site tunneling:

  PREFIX:0x:00:5E:FE:V4ADDR
                  ^^

where "PREFIX" is a /64 prefix and "V4ADDR" is a 32-bit
IPv4 address. What if we were to define a corresponding
prefix form for intra-site *translation* as:

  PREFIX:0x:00:5E:FD:V4ADDR
                  ^^

This means that a single /64 could be assigned to a
tunneling-plus-translation interface, and the 'FE'
vs. 'FD' would tell the interface when to tunnel vs.
when to translate, respectively.

Comments?

Fred
fred.l.templin@boeing.com

> -----Original Message-----
> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
> Sent: Friday, April 24, 2009 1:47 PM
> To: Dan Wing
> Cc: 'Behave WG'
> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation docume=
nts]
>
> I agree with Dan.
>
>    Brian
>
> On 2009-04-25 04:25, Dan Wing wrote:
> >> -----Original Message-----
> >> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> >> Sent: Friday, April 24, 2009 2:29 AM
> >> To: Brian E Carpenter
> >> Cc: Dan Wing; 'Behave WG'
> >> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6
> >> translation documents]
> >>
> >> Brian E Carpenter escribi=F3:
> >>> Dan,
> >>>
> >>> On 2009-04-21 13:48, Dan Wing wrote:
> >>> ...
> >>>
> >>>> My real question is:
> >>>>
> >>>> Does the risk (of black hole routes being created) outweigh
> >>>> the benefit of a Well Known prefix.
> >>>>
> >>> Even after a lot of on- and off-list discussion, I have trouble
> >>> answering that question in the abstract.
> >>>
> >>> If the exact rules for the WKP are such that only a flagrant
> >>> breach of a MUST or MUST NOT can cause a black hole, I would
> >>> agree to a WKP as an optional alternative to LIR. If we can't
> >>> make the WKP rules completely clear, we can't evaluate the risk.
> >>>
> >> I thbk that if we want to be conservative and stay away from
> >> trouble, we
> >> can use a similar text to the one available in the ULA RFC (which is
> >> more restrictive than the one you sent for the 6to4)
> >>
> >> Rephrasing it, it would look something like this:
> >>
> >>
> >>    Addresses containing the WKP is designed to be routed
> >> inside of a site in
> >>    the same manner as other types of unicast addresses.  They can be
> >>    carried in any IPv6 routing protocol without any change.
> >                         ^
> >                      interior
> >
> >>    The default behavior of exterior routing protocol sessions between
> >>    administrative routing regions must be to ignore receipt of and not
> >>    advertise prefixes in the WKP block.  A network operator may
> >>    specifically configure routes for the WKP for inter-site
> >> communication.
> >>
> >>    If BGP is being used at the site border with an ISP, the
> >> default BGP
> >>    configuration must filter out the WKP, both
> >>    incoming and outgoing.  It must be set both to keep any WKP
> >>    from being advertised outside of the site as well as
> >>    to keep this prefixes from being learned from another site.
> >>
> >> Are these good for you?
> >
> > Second and third paragraph are somewhat redundant.
> >
> > RFC2119 language would improve the text.
> >
> > The text does seem to capture the WG consensus on WK prefix, and
> > this is certainly the safest recommendation at this point in time.
> >
> > -d
> >
> >
> >> Regards, marcelo
> >>
> >>
> >>>    Brian
> >>> _______________________________________________
> >>> Behave mailing list
> >>> Behave@ietf.org
> >>> https://www.ietf.org/mailman/listinfo/behave
> >>>
> >>>
> >
> >
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
_______________________________________________
Behave mailing list
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From dthaler@windows.microsoft.com  Fri Apr 24 18:28:39 2009
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From: Dave Thaler 
To: Dan Wing , 'marcelo bagnulo braun' ,  'Brian E Carpenter' 
Date: Fri, 24 Apr 2009 18:31:34 -0700
Thread-Topic: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation documents]
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I agree with this approach, including Dan's feedback.

-Dave

________________________________________
From: behave-bounces@ietf.org [behave-bounces@ietf.org] On Behalf Of Dan Wi=
ng [dwing@cisco.com]
Sent: Friday, April 24, 2009 9:25 AM
To: 'marcelo bagnulo braun'; 'Brian E Carpenter'
Cc: 'Behave WG'
Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6 translation document=
s]

> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> Sent: Friday, April 24, 2009 2:29 AM
> To: Brian E Carpenter
> Cc: Dan Wing; 'Behave WG'
> Subject: Re: [BEHAVE] WKP risk [Re: Plan for IPv4/IPv6
> translation documents]
>
> Brian E Carpenter escribi=F3:
> > Dan,
> >
> > On 2009-04-21 13:48, Dan Wing wrote:
> > ...
> >
> >> My real question is:
> >>
> >> Does the risk (of black hole routes being created) outweigh
> >> the benefit of a Well Known prefix.
> >>
> >
> > Even after a lot of on- and off-list discussion, I have trouble
> > answering that question in the abstract.
> >
> > If the exact rules for the WKP are such that only a flagrant
> > breach of a MUST or MUST NOT can cause a black hole, I would
> > agree to a WKP as an optional alternative to LIR. If we can't
> > make the WKP rules completely clear, we can't evaluate the risk.
> >
>
> I thbk that if we want to be conservative and stay away from
> trouble, we
> can use a similar text to the one available in the ULA RFC (which is
> more restrictive than the one you sent for the 6to4)
>
> Rephrasing it, it would look something like this:
>
>
>    Addresses containing the WKP is designed to be routed
> inside of a site in
>    the same manner as other types of unicast addresses.  They can be
>    carried in any IPv6 routing protocol without any change.
                        ^
                     interior

>    The default behavior of exterior routing protocol sessions between
>    administrative routing regions must be to ignore receipt of and not
>    advertise prefixes in the WKP block.  A network operator may
>    specifically configure routes for the WKP for inter-site
> communication.
>
>    If BGP is being used at the site border with an ISP, the
> default BGP
>    configuration must filter out the WKP, both
>    incoming and outgoing.  It must be set both to keep any WKP
>    from being advertised outside of the site as well as
>    to keep this prefixes from being learned from another site.
>
> Are these good for you?

Second and third paragraph are somewhat redundant.

RFC2119 language would improve the text.

The text does seem to capture the WG consensus on WK prefix, and
this is certainly the safest recommendation at this point in time.

-d


> Regards, marcelo
>
>
> >    Brian
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
> >
> >
>

_______________________________________________
Behave mailing list
Behave@ietf.org
https://www.ietf.org/mailman/listinfo/behave

From xing@cernet.edu.cn  Sat Apr 25 16:17:08 2009
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Cc: congxiao , Behave WG , Keith Moore , Dave Thaler , Xing Li , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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Thanks.

I think we can add the issues of the checksum-neutral in the next 
version of the v4v6-translation document.

(1) For arbitrary addresses, the transport layer checksum must be 
recalculated.
(2) Besides TCP and UDP, other transport layer protocols (e.g. DCCP) 
could be handled based on (details, ...)
(3) For unknown transport layer protocols, the translator should pass 
them along unmodified.
(4) For the stateless one-to-one translation, if the operator chooses 
the IPv6 address that maps to the IPv6 source address such that it and 
the translator prefix together checksum to 0, protocols that use the 
normal checksum, but the translator doesn't know how to adjust the 
checksum for, can successfully be translated.

Anything else is missing?

xing



Iljitsch van Beijnum 写é“:
> Let's short-circuit this discussion before it spins any further out of 
> control...
>
> This issue is that the current translation draft doesn't address the 
> checksum issue in enough detail.
>
> What happens with DCCP?
>
> What about unknown protocols which may or may not use the normal 
> checksum?
>
> I think if the document goes forward, it should mention this issue and 
> specify how unknown protocols are to be handled. Which would be: pass 
> them along unmodified.
>
> Also, I would very much like to see mentioned, even if it's only one 
> sentence, that if the opertor chooses the IPv6 address that maps to 
> the IPv6 source address such that it and the translator prefix 
> together checksum to 0, protocols that use the normal checksum, but 
> the translator doesn't know how to adjust the checksum for, can 
> successfully be translated.
>
>

From xing@cernet.edu.cn  Sun Apr 26 06:23:39 2009
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From: Xing Li 
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To: marcelo bagnulo braun 
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Cc: congxiao , behave@ietf.org, Fred Baker , pierre.levis@orange-ftgroup.com
Subject: Re: [BEHAVE] Question on embedded	address	format	in	draft-baker-behave-v4v6-framework-02
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We have an interesting and somehow related observation.

If you try to resolve www.xys.org. You got

% host www.xys.org
www.xys.org has address 69.93.206.250
www.xys.org has IPv6 address ::ffff:69.93.206.250

Can you reach ::ffff:69.93.206.250 via IPv6 Internet?

Our conclusions are:

(1) ::ffff:69.93.206.250 cannot be forwarded on the wire and cannot be 
globally routed.
(2) Configuring an AAAA RR in the source without universally accessible 
IPv6 address is considered HARMFUL.

xing


marcelo bagnulo braun 写é“:
> Rémi Després escribió:
>> Brian E Carpenter - le (m/j/a) 4/21/09 3:30 AM:
>>
>>> Well, SIIT defines the IPv4-mapped prefix (::ffff/96), which is a WKP
>>> if I ever saw one. NAT-PT says nothing to forbid using it as the 
>>> PREFIX.
>>> Actually it says you can use whatever you want. Of course, SIIT is very
>>> clear that IPv4-mapped prefixes should never appear in IPv6 routing.
>>
>>
>> In January 2008, there was a v6ops discussion on the subject, but 
>> AFAIK without conclusion.
>>
>> IMHO ::ffff/96 is the natural choice for a /96 WKP for IPv4 in IPv6 
>> embedded addresses: it already exists, and has all what is needed.
> the problem is that current IPv6 implementations do use this prefix in 
> the wire, so if they receive a synthetic AAAA RR with this prefix they 
> will send an IPv4 packet if they can but they will NOt send an IPv6 
> packet with that prefix in the destination address. so this is a non 
> starter for this reason.
>
> It would be possible to use the IPv4 compatible prefix, but, the 
> problem if we use that is that with current rfc3484 default policy 
> table, the translated connectivity is preferred over the native v4 
> connecitivty, which is an issue
>
> hence, imho it is better to use a new prefix for this
>
> regards, marcelo
>
>
>>
>> In my understanding, none of the reasons discussed in "IPv4-Mapped 
>> Addresses on the Wire Considered Harmful" applies to use cases of 
>> NAT64s.
>>
>> (This is of course NOT to say that a /96 WKP should be the ONLY way 
>> to map an IPv4 address in an IPv6 address. Many other can exist, in 
>> particular with port-extended IPv4 addresses, with SAM etc.)
>>
>> Regards,
>>
>> RD
>>
>
> _______________________________________________
> Behave mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave
>
>

From iljitsch@muada.com  Sun Apr 26 09:21:37 2009
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Cc: congxiao , Behave WG , Keith Moore , Dave Thaler , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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On 26 apr 2009, at 1:17, Xing Li wrote:

> I think we can add the issues of the checksum-neutral in the next  
> version of the v4v6-translation document.

> (1) For arbitrary addresses, the transport layer checksum must be  
> recalculated.
> (2) Besides TCP and UDP, other transport layer protocols (e.g. DCCP)  
> could be handled based on (details, ...)

As far as I know, DCCP is the only other transport protocol that uses  
the regular checksum. Would it be possible to add text about how to  
recalculate the DCCP checksum?

> (3) For unknown transport layer protocols, the translator should  
> pass them along unmodified.
> (4) For the stateless one-to-one translation, if the operator  
> chooses the IPv6 address that maps to the IPv6 source address such  
> that it and the translator prefix together checksum to 0, protocols  
> that use the normal checksum, but the translator doesn't know how to  
> adjust the checksum for, can successfully be translated.

Right. I would use text like:

"If an operator chooses an IPv6 address for a host served by a  
translator where the on'es complement addition of the 16-bit words in  
this IPv6 address and those in the translator prefix equal zero  
(0x0000 or 0xffff) then, as far as the checksum is concerned, all  
protocols that use a one's complement checksum will pass through the  
translator successfully, even if the protocol in question is unknown  
to the translator."

Thanks,

Iljitsch

From gregory.ietf@gmail.com  Sun Apr 26 23:24:52 2009
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From: Gregory Lebovitz 
To: Brian E Carpenter 
Content-Type: multipart/alternative; boundary=0016364178fd27d56b0468836c7e
Cc: Behave WG , Dave Thaler 
Subject: Re: [BEHAVE] silently discarding packets?
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On Wed, Apr 22, 2009 at 3:10 PM, Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> For sure you can't rely on it because of firewalls, but
> otoh it could be extremely useful for diagnostics when
> things go wrong.
>
> I'd go for SHOULD, but MUST be possible to configure on or off.


I like Brian's thinking on this, and would take it just a bit further. The
text ought to:

- explain why it is very useful for diagnostics to send
- explain in that firewalls today provide the option for sending or not
sending
- describe the security consideration in choosing to send or not send
- say, "because of the contradictory nature of the two good things (i.e.
diagnostics and security) the deployer will need to decide which is best for
their environment."
- MAY send
- MAY silently discard
- implementations MUST provide the option to do either
- hosts MUST NOT assume the existance of a send

Not the tightest text in the world, but it fits the reality of the situation
in question.

Hope it helps,
Gregory.


>
>
>   Brian
>
> On 2009-04-23 09:03, Dave Thaler wrote:
> > I think the choice of MAY vs SHOULD should not be made simply
> > on the basis of what most implementations do, but rather on
> > what we think the right thing is.  (If it's a MAY or a SHOULD
> > and implementations don't do it, they're still compliant.)
> >
> > I'd say the NAT64 component SHOULD do it, but that a firewall
> > (whether on the same box or not) might block it.
> >
> > -Dave
> >
> >> -----Original Message-----
> >> From: behave-bounces@ietf.org [mailto:behave-bounces@ietf.org] On
> >> Behalf Of marcelo bagnulo braun
> >> Sent: Wednesday, April 22, 2009 7:18 AM
> >> To: Behave WG; Gregory M. Lebovitz
> >> Subject: [BEHAVE] silently discarding packets?
> >>
> >> Hi,
> >>
> >> One of the comments we received form Greg on the NAT64 draft is about
> >> whether the NAT64 should send ICMP error messages when discarding
> >> packets for which it doesn't have a binding for.
> >>
> >> The current draft reads:
> >>
> >>      If the packet arrived on the IPv4 interface and the NAT64
> >>      filters on its IPv4 interface, then the NAT64 checks to see if
> >>      the incoming packet is allowed according to the
> >>      address-dependent filtering rule. To do this, it searches for
> >>      a session table entry with a source IPv4 transport address
> >>      equal to the destination IPv4 transport address in the incoming
> >>      5-tuple and destination IPv4 address (in the session table entry)
> >>      equal to the source IPv4 address in the incoming 5-tuple.
> >>      If such an entry
> >>      is found (there may be more than one), packet processing
> >>      continues. Otherwise, the packet is discarded. If the packet
> >>      is discarded, then an ICMP message SHOULD be sent to the
> >>      original sender of the packet, unless the discarded packet is
> >>      itself an ICMP message. The ICMP message, if sent, has a type
> >>      of 3 (Destination Unreachable) and a code of 13 (Communication
> >>      Administratively Prohibited).
> >>
> >> According to Greg, most implementations silently drop the packet in
> >> thsi
> >> case.
> >> I was thinking to downgrade it to a MAY... what people think?
> >>
> >> Thanks, marcelo
> >>
> >>
> >> _______________________________________________
> >> Behave mailing list
> >> Behave@ietf.org
> >> https://www.ietf.org/mailman/listinfo/behave
> >
> > _______________________________________________
> > Behave mailing list
> > Behave@ietf.org
> > https://www.ietf.org/mailman/listinfo/behave
> >
>



-- 
----
IETF related email from
Gregory M. Lebovitz
Juniper Networks

--0016364178fd27d56b0468836c7e
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable





On Wed, Apr 22, 2009 at 3:10 PM, Brian E Carpent=
er <bri=
an.e.carpenter@gmail.com> wrote:


For sure you can't rely on i=
t because of firewalls, but
otoh it could be extremely useful for diagno=
stics when

things go wrong.

I'd go for SHOULD, but MUST be possible to conf=
igure on or off.


=A0


I like Brian's thinking on this, and would take it just a bit furt=
her. The text ought to:


=A0


- explain why it is very useful for diagnostics to send


- explain in that firewalls today provide the option for sending or no=
t sending


- describe the security consideration in choosing to send or not send<=
/div>

- say, "because of the contradictory nature of the two good thing=
s (i.e. diagnostics and security) the deployer will need to decide which is=
 best for their environment."


- MAY send


- MAY silently discard


- implementations MUST provide the option to do either


- hosts MUST NOT assume the existance of a send


=A0


Not the tightest text in the world, but it fits the reality of the sit=
uation in question.


=A0


Hope it helps,


Gregory.


=A0




=A0 Brian







On 2009-04-23 09:03, Dave Thaler wrote:
> I thi=
nk the choice of MAY vs SHOULD should not be made simply
> on the bas=
is of what most implementations do, but rather on
> what we think the=
 right thing is. =A0(If it's a MAY or a SHOULD

> and implementations don't do it, they're still compliant.)
=
>
> I'd say the NAT64 component SHOULD do it, but that a firew=
all
> (whether on the same box or not) might block it.
>

> -Dave
>
>> -----Original Message-----
>> From:=
 behave-bounces@ietf.org [ma=
ilto:behave-bounces@ietf.org=
] On

>> Behalf Of marcelo bagnulo braun
>> Sent: Wednesday, April=
 22, 2009 7:18 AM
>> To: Behave WG; Gregory M. Lebovitz
>>=
; Subject: [BEHAVE] silently discarding packets?
>>
>> Hi=
,

>>
>> One of the comments we received form Greg on the NAT64=
 draft is about
>> whether the NAT64 should send ICMP error messag=
es when discarding
>> packets for which it doesn't have a bind=
ing for.

>>
>> The current draft reads:
>>
>> =A0 =
=A0 =A0<t>If the packet arrived on the IPv4 interface and the NAT64>> =A0 =A0 =A0filters on its IPv4 interface, then the NAT64 checks =
to see if

>> =A0 =A0 =A0the incoming packet is allowed according to the
>=
> =A0 =A0 =A0address-dependent filtering rule. To do this, it searches f=
or
>> =A0 =A0 =A0a session table entry with a source IPv4 transpor=
t address
>> =A0 =A0 =A0equal to the destination IPv4 transport ad=
dress in the incoming

>> =A0 =A0 =A05-tuple and destination IPv4 address (in the session ta=
ble entry)
>> =A0 =A0 =A0equal to the source IPv4 address in the i=
ncoming 5-tuple.
>> =A0 =A0 =A0If such an entry
>> =A0 =
=A0 =A0is found (there may be more than one), packet processing

>> =A0 =A0 =A0continues. Otherwise, the packet is discarded. If the p=
acket
>> =A0 =A0 =A0is discarded, then an ICMP message SHOULD be s=
ent to the
>> =A0 =A0 =A0original sender of the packet, unless the=
 discarded packet is

>> =A0 =A0 =A0itself an ICMP message. The ICMP message, if sent, has =
a type
>> =A0 =A0 =A0of 3 (Destination Unreachable) and a code of =
13 (Communication
>> =A0 =A0 =A0Administratively Prohibited).</=
t>
>>

>> According to Greg, most implementations silently drop the packet i=
n
>> thsi
>> case.
>> I was thinking to downgrad=
e it to a MAY... what people think?
>>
>> Thanks, marcelo=


>>
>>
>> __________________________________________=
_____
>> Behave mailing list
>> Behave@ietf.org
>> https://www.ietf.org/mailman/list=
info/behave

>
> _______________________________________________
> Behave=
 mailing list
> Behave@ietf.org
> https://www.ietf.org/mailman/listinfo/behave

>





-- 
----
IETF related email from
Gregory M. Lebovit=
z
Juniper Networks


--0016364178fd27d56b0468836c7e--

From remi.despres@free.fr  Mon Apr 27 01:46:39 2009
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Cc: congxiao , Dave Thaler , Behave WG , Keith Moore , Fred Baker 
Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02 - Checksum processing
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Iljitsch van Beijnum  -  le (m/j/a) 4/26/09 6:21 PM:
> On 26 apr 2009, at 1:17, Xing Li wrote:
> 
>> I think we can add the issues of the checksum-neutral in the next 
>> version of the v4v6-translation document.

Agreed.
> 
>> (1) For arbitrary addresses, the transport layer checksum must be 
>> recalculated. (2) Besides TCP and UDP, other transport layer 
>> protocols (e.g. DCCP) could be handled based on (details, ...)
> 
> As far as I know, DCCP is the only other transport protocol that uses
>  the regular checksum. Would it be possible to add text about how to 
> recalculate the DCCP checksum?
> 
>> (3) For unknown transport layer protocols, the translator should 
>> pass them along unmodified. (4) For the stateless one-to-one 
>> translation, if the operator chooses the IPv6 address that maps to 
>> the IPv6 source address such that it and the translator prefix 
>> together checksum to 0, protocols that use the normal checksum, but
>>  the translator doesn't know how to adjust the checksum for, can 
>> successfully be translated.
> 
> Right. I would use text like:
> 
> "If an operator chooses an IPv6 address for a host served by a 
> translator where the on'es complement addition of the 16-bit words in
>  this IPv6 address and those in the translator prefix equal zero 
> (0x0000 or 0xffff) then, as far as the checksum is concerned, all 
> protocols that use a one's complement checksum will pass through the 
> translator successfully, even if the protocol in question is unknown 
> to the translator."

Pushing the analysis further, here is my current understanding of
higher-layer checksum handling in v4-v6 translations:

1. Adjust transport checksum in datagrams if all of:
- v4-to-v6 or v6-to-v4
- first or only fragment of a datagram
- TCP, UDP, or DCCP
- [(Cksm of v6 adds) - (cksm of v4 adds)] is NOT 0xOOOO or 0xFFFF

2. Adjust transport checksum in ICMP error message if all of the following:
- v4-to-v6 or v6-to-v4
- single fragment datagram
- ICMP error message for a TCP, UDP, or DCCP datagram
- [(Cksm of returned v6 adds) - (cksm of returned v4 adds)] is NOT 
0xOOOO or 0xFFFF

3. Compute UDP checksum if all of:
- v4 to v6
- single fragment datagram
- UDP
- v4 transport checksum is 0x0000

4. Compute ICMP checksum, possibly after rule 2. if all of:
- v4 to v6
- ICMP

5. Discard packet if all of the following:
- v4-to-v6
- first fragment of a multi-fragment datagram
- UDP
- v4 transport checksum is 0x0000
- the translator doesn't try to reassemble the datagram, or if it tries 
doesn't succeed

6. Forward without higher layer checksum modification if none of the
above rules applies

There may be remaining errors in this, which better specialists of these
subjects will find, but I suggest that this kind of comprehensive
presentation may help to understand what we really recommend.

NOTE: This leaves a problem if an IPv4  single fragment UDP datagram
with a 0x0000 UDP checksum is discarded after a v4-to-v6 translation.
In this case, the UDP checksum in the returned ICMP error message 
cannot, after a stateless v4-to-v6 translation, be the same as that of 
the original packet.

How important this remark may be is unclear to me. But it identifies an 
advantage, among others, of combining stateless address mappings with 
encapsulations  (where inner packets are unmodified e2e) rather than 
with translations.

Regards,

RD






From iljitsch@muada.com  Mon Apr 27 06:06:10 2009
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To: =?ISO-8859-1?Q?R=E9mi_Denis-Courmont?= 
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Cc: IPv6 Operations , Behave WG 
Subject: Re: [BEHAVE] Feedback requested:FTP ALG for IPv6-to-IPv4 translation
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[CC to behave list, trim behave or v6ops as required]

On 27 apr 2009, at 13:31, R=E9mi Denis-Courmont wrote:

> This does not say how "EPSV ALL" is translated... You cannot let =20
> EPSV ALL
> go through if you translate later EPSV requests, as it would break
> EPSV-capable FTP IPv4 servers. As such, I guess the ALG should =20
> accept the
> request and not forward it to the FTP server.

Not sure if issuing EPSV ALL would actually cause trouble if then PASV =20=

is issued, but just to be on the safe side and to avoid servers (or =20
middleboxes) reacting badly to EPSV in general it's probably best to =20
filter these out. Need to think about EPSV , too.

> |  If the server's 227 response contains an IPv4 address that doesn't
> |  match the destination of the control channel, the FTP ALG SHOULD =20=

> send
> |  the following response to the client:

> |  425 Can't open data connection.

> How common is this case? Shouldn't the ALG succeed, as it can do IPv4
> address translation anyway?

It should be rare, because in this case the server asks to connect to =20=

a different host (or different address on the same host) to get the =20
data than the address we're talking to for the control channel.

The problem is that the 229 response doesn't allow for an address. It =20=

would be possible to put it in there anyway, but I have no idea what =20
the result of that would be. Alternatively, it would be possible to =20
create a mapping from pref64::10.0.0.1 port 1234 to 10.0.0.2 port 1234 =20=

as a way to solve this, but that's very ugly and this way EPSV =20
translation can't happen on just the control channel anymore.

>> One thing that would be good to know is whether ALL IPv6 FTP clients
>> do EPSV or if there are also ones that do EPRT or, worse, active FTP
>> without issuing EPRT.

> Not that I know. However, as the author of one popular piece of =20
> software
> that does include FTP functionality, I would like to mention that some
> users explicitly requested active mode be added.

Right. Active mode with EPRT would work if that part is also =20
implemented as described in the draft (EPRT is MAY, EPSV is SHOULD), =20
but:

> Their rationale was that
> it's better/easier for their client-side firewall to allow inbound =20
> traffic
> from TCP port 20 (ftp-data)

If port 20 is assumed and no EPSV or EPRT is issued, then there is no =20=

obvious way to correlate the incoming session on the v4 side to the v6 =20=

host, especially if multiple clients are talking to the same server at =20=

the same time. I think this is too nasty to bother with.=

From remi.despres@free.fr  Mon Apr 27 10:14:38 2009
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Cc: Xing Li , 'Behave WG' 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Keith Moore  -  le (m/j/a) 4/25/09 2:56 AM:
>> That falls into the "well-known prefix causes harm" category.
>>
>> I recall that one of the presentations at the Google IPv6 
>> conference showed there were a lot of Teredo and 6to4
>> prefixes advertised in DNS.  If IANA assigns a well known 
>> prefix for 6/4 translation, we should expect some people
>> will stick that prefix into their DNS records.  Perhaps
>> out of incompetence, perhaps while debugging or learning, 
>> or perhaps because 'it works fine for my site that way'.
> 
> I am becoming more and more convinced that a WKP for v4/v6 translation
> is a Bad Idea.  That is, it is certain to cause harm, and it's hard to
> see how it will actually be of any significant benefit.

Very interesting debate.

(A) Here is where, in my understanding, a WKP brings a significant benefit:
If DNS servers of IPv4-ony hosts contain the IPv6 addresses at which 
IPv6-only hosts can reach them, these hosts can be reached by IPv6-only 
hosts without sacrificing DNSsec (while RR translations in DNS64s 
prohibits the use of DNSsec).


(B) Now, here is how to avoid, in my understanding, any short term harm:

1. If the WKP is ::FFFF/96 (that of IPv4 mapped addresses), it is 
already harmful neither to _IPv4-only hosts_ (that don't see AAAAs) nor 
to _IPv4-enabled dual-stack hosts_ (according to RFC 2553 they send in 
IPv4 packets that have mapped address destinations).

The relevant quote from RFC 2553 sec3.7 is:
"Applications may use PF_INET6 sockets to open TCP connections to IPv4
nodes, or send UDP packets to IPv4 nodes, by simply encoding the 
destination's IPv4 address as an IPv4-mapped IPv6 address, and
passing that address, within a sockaddr_in6 structure, in the
connect() or sendto() call."

2. If an ISPs wants to offer IPv6-only addresses to its hosts (that have 
either IPv6-only stacks or dual stacks with IPv4 not enabled ), it is 
sufficient, to avoid suffering any harm, that its DNS64s _translate IPv4 
mapped address prefixes they receive into their ISP specific NAT64 
prefixes_.

With DNS64s doing as proposed in 2., DNSsec compatibility is still 
broken, but not more than without a WKP.

DNSsec deployment being likely to take enough time to prepare a more 
complete solution, as described below.


(C) Finally, here is how to eventually restore DNSsec compatibility.

- Before DNSsec with NAT64s becomes important, make sure that:
  o TCP/IP dual stacks don't discard packets whose destination is the 
mapped address when IPv4 is not enabled, patching them where necessary. 
  (some stacks discarding these packets have been seen to exist).
  o firewalls that discard these packets by default can be configured 
not to do it.
- Then IPv6-only ISPs can:
  o ensure that routes to their NAT64s exist for the mapped address prefix
  o disable the translation of mapped addresses prefixes into 
ISP-specific prefixes.

The end result is that IPv4-only servers, that have advertised their 
mapped address in their DNSsec capable DNS servers (possibly a long time 
ago) become accessible by IPv6-only hosts _that rely on DNSsec_.

Isn't this an interesting promise?

Regards,
RD



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Cc: 'Behave WG' , 'Keith Moore' , 'Xing Li' , 'Fred Baker' 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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=20

> -----Original Message-----
> From: R=E9mi Despr=E9s [mailto:remi.despres@free.fr]=20
> Sent: Monday, April 27, 2009 10:16 AM
> To: Keith Moore; Dan Wing; Marcello Bagnulo Braun; Fred Baker
> Cc: 'Iljitsch van Beijnum'; 'Behave WG'; Xing Li
> Subject: Re: [BEHAVE] Question on embedded address format in=20
> draft-baker-behave-v4v6-framework-02
>=20
> Keith Moore  -  le (m/j/a) 4/25/09 2:56 AM:
> >> That falls into the "well-known prefix causes harm" category.
> >>
> >> I recall that one of the presentations at the Google IPv6=20
> >> conference showed there were a lot of Teredo and 6to4
> >> prefixes advertised in DNS.  If IANA assigns a well known=20
> >> prefix for 6/4 translation, we should expect some people
> >> will stick that prefix into their DNS records.  Perhaps
> >> out of incompetence, perhaps while debugging or learning,=20
> >> or perhaps because 'it works fine for my site that way'.
> >=20
> > I am becoming more and more convinced that a WKP for v4/v6=20
> translation
> > is a Bad Idea.  That is, it is certain to cause harm, and=20
> it's hard to
> > see how it will actually be of any significant benefit.
>=20
> Very interesting debate.
>=20
> (A) Here is where, in my understanding, a WKP brings a=20
> significant benefit:
> If DNS servers of IPv4-ony hosts contain the IPv6 addresses at which=20
> IPv6-only hosts can reach them, these hosts can be reached by=20
> IPv6-only=20
> hosts without sacrificing DNSsec (while RR translations in DNS64s=20
> prohibits the use of DNSsec).
>=20
>=20
> (B) Now, here is how to avoid, in my understanding, any short=20
> term harm:
>=20
> 1. If the WKP is ::FFFF/96 (that of IPv4 mapped addresses), it is=20
> already harmful neither to _IPv4-only hosts_ (that don't see=20
> AAAAs) nor=20
> to _IPv4-enabled dual-stack hosts_ (according to RFC 2553=20
> they send in=20
> IPv4 packets that have mapped address destinations).

What of
http://tools.ietf.org/html/draft-itojun-v6ops-v4mapped-harmful-02,=20
or was it found that we could resolve that harm?  (I noticed
draft-itojun-v6ops-v4mapped-harmful-02 appears to have not been
published as an RFC.)

-d


> The relevant quote from RFC 2553 sec3.7 is:
> "Applications may use PF_INET6 sockets to open TCP connections to IPv4
> nodes, or send UDP packets to IPv4 nodes, by simply encoding the=20
> destination's IPv4 address as an IPv4-mapped IPv6 address, and
> passing that address, within a sockaddr_in6 structure, in the
> connect() or sendto() call."
>=20
> 2. If an ISPs wants to offer IPv6-only addresses to its hosts=20
> (that have=20
> either IPv6-only stacks or dual stacks with IPv4 not enabled ), it is=20
> sufficient, to avoid suffering any harm, that its DNS64s=20
> _translate IPv4=20
> mapped address prefixes they receive into their ISP specific NAT64=20
> prefixes_.
>=20
> With DNS64s doing as proposed in 2., DNSsec compatibility is still=20
> broken, but not more than without a WKP.
>=20
> DNSsec deployment being likely to take enough time to prepare a more=20
> complete solution, as described below.
>=20
>=20
> (C) Finally, here is how to eventually restore DNSsec compatibility.
>=20
> - Before DNSsec with NAT64s becomes important, make sure that:
>   o TCP/IP dual stacks don't discard packets whose destination is the=20
> mapped address when IPv4 is not enabled, patching them where=20
> necessary.=20
>   (some stacks discarding these packets have been seen to exist).
>   o firewalls that discard these packets by default can be configured=20
> not to do it.
> - Then IPv6-only ISPs can:
>   o ensure that routes to their NAT64s exist for the mapped=20
> address prefix
>   o disable the translation of mapped addresses prefixes into=20
> ISP-specific prefixes.
>=20
> The end result is that IPv4-only servers, that have advertised their=20
> mapped address in their DNSsec capable DNS servers (possibly=20
> a long time=20
> ago) become accessible by IPv6-only hosts _that rely on DNSsec_.
>=20
> Isn't this an interesting promise?
>=20
> Regards,
> RD
>=20
>=20


From jhw@apple.com  Mon Apr 27 12:17:27 2009
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Subject: Re: [BEHAVE] Comments on draft-baker-behave-v4v6-translation-02
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On Apr 20, 2009, at 07:36, Iljitsch van Beijnum wrote:
>
> On the other hand, SCTP includes address management that would  
> probably fail in the presence of protocol translation.


Thinking about this some, I don't see why it should fail.  As long as  
the NAT64/DNS64 function operates properly, then SCTP should sail  
along fine without caring what network layer is carrying its packets  
in which address realms.


--
james woodyatt 
member of technical staff, communications engineering



From iljitsch@muada.com  Mon Apr 27 13:50:11 2009
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Cc: Xing Li , Fred Baker 
Subject: [BEHAVE] FTP64 draft
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Hi,

I did two updates of the FTP ALG for IPv6-to-IPv4 translation today.

Changes:

- added text to make stateless translation support more explicit
- covered the default port 20 case
- EPSV  handling

Main question now is whether we want to make active FTP translation a  
MUST, SHOULD or MAY. It's MAY now, based on the fact that most clients  
and all servers do passive. I haven't looked extensively at clients,  
but the command line FTP that comes with Windows only supports active  
FTP. (I also need to tighten up the text a bit more.)

I would especially like to hear from Fred and Xing Li if this is  
compatible with their work.

I've also asked for comments on the apps area discussion and v6ops  
lists.

And if anyone has statistics about how common IPv6 FTP using port 20  
is that would be very useful.

As this work doesn't seem to be controversial and it's considered  
important for a NAT64 deployment, I guess if everyone is happy with  
what's there now we could try to get this out the door soon so we can  
focus on the more challenging stuff.

Iljitsch


Begin forwarded message:

> Filename:	 draft-van-beijnum-behave-ftp64
> Revision:	 02
> Title:		 An FTP Application Layer Gateway for IPv6-to-IPv4 translation
> Creation_date:	 2009-04-27
> WG ID:		 Independent Submission
> Number_of_pages: 8

> Abstract:
> The only FTP mode that works without changes through an IPv6-to-IPv4
> translator is extended passive, introduced in 1998.  However, many
> existing FTP servers don't support this mode, making it impossible to
> support the File Transfer Protocol through an IPv6-to-IPv4 translator
> without an Application Layer Gateway.  This document describes the
> behavior of such an ALG.

http://www.ietf.org/internet-drafts/draft-van-beijnum-behave-ftp64-02.txt

From remi.despres@free.fr  Mon Apr 27 23:34:00 2009
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Cc: 'Behave WG' , 'Keith Moore' , 'Xing Li' , 'Fred Baker' 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Dan,

At the end of a discussion in 2002 on Itojun's draft, Erik Nordmark 
wrote in www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00263:
"An implementation needs to be configured to either be IPv6-only or
dual stack.
In the dual stack case the mapped addresses at the API correspond
to IPv4 packets on the wire.
In the IPv6-only case the mapped addresses at the API correspond
to IPv6 packets on the wire next to the node, and on the other side of
the translator they correspond to IPv4 packets."

I agree with this.

Note that this statement received no objection in 2002, and that 
Itojun's didn't issue a -01 version of his draft.

Regards,

RD


Dan Wing  -  le (m/j/a) 4/27/09 7:52 PM:
>  
> 
>> -----Original Message-----
>> From: Rémi Després [mailto:remi.despres@free.fr] 
>> Sent: Monday, April 27, 2009 10:16 AM
>> To: Keith Moore; Dan Wing; Marcello Bagnulo Braun; Fred Baker
>> Cc: 'Iljitsch van Beijnum'; 'Behave WG'; Xing Li
>> Subject: Re: [BEHAVE] Question on embedded address format in 
>> draft-baker-behave-v4v6-framework-02
>>
>> Keith Moore  -  le (m/j/a) 4/25/09 2:56 AM:
>>>> That falls into the "well-known prefix causes harm" category.
>>>>
>>>> I recall that one of the presentations at the Google IPv6 
>>>> conference showed there were a lot of Teredo and 6to4
>>>> prefixes advertised in DNS.  If IANA assigns a well known 
>>>> prefix for 6/4 translation, we should expect some people
>>>> will stick that prefix into their DNS records.  Perhaps
>>>> out of incompetence, perhaps while debugging or learning, 
>>>> or perhaps because 'it works fine for my site that way'.
>>> I am becoming more and more convinced that a WKP for v4/v6 
>> translation
>>> is a Bad Idea.  That is, it is certain to cause harm, and 
>> it's hard to
>>> see how it will actually be of any significant benefit.
>> Very interesting debate.
>>
>> (A) Here is where, in my understanding, a WKP brings a 
>> significant benefit:
>> If DNS servers of IPv4-ony hosts contain the IPv6 addresses at which 
>> IPv6-only hosts can reach them, these hosts can be reached by 
>> IPv6-only 
>> hosts without sacrificing DNSsec (while RR translations in DNS64s 
>> prohibits the use of DNSsec).
>>
>>
>> (B) Now, here is how to avoid, in my understanding, any short 
>> term harm:
>>
>> 1. If the WKP is ::FFFF/96 (that of IPv4 mapped addresses), it is 
>> already harmful neither to _IPv4-only hosts_ (that don't see 
>> AAAAs) nor 
>> to _IPv4-enabled dual-stack hosts_ (according to RFC 2553 
>> they send in 
>> IPv4 packets that have mapped address destinations).
> 
> What of
> http://tools.ietf.org/html/draft-itojun-v6ops-v4mapped-harmful-02, 
> or was it found that we could resolve that harm?  (I noticed
> draft-itojun-v6ops-v4mapped-harmful-02 appears to have not been
> published as an RFC.)
> 
> -d
> 
> 
>> The relevant quote from RFC 2553 sec3.7 is:
>> "Applications may use PF_INET6 sockets to open TCP connections to IPv4
>> nodes, or send UDP packets to IPv4 nodes, by simply encoding the 
>> destination's IPv4 address as an IPv4-mapped IPv6 address, and
>> passing that address, within a sockaddr_in6 structure, in the
>> connect() or sendto() call."
>>
>> 2. If an ISPs wants to offer IPv6-only addresses to its hosts 
>> (that have 
>> either IPv6-only stacks or dual stacks with IPv4 not enabled ), it is 
>> sufficient, to avoid suffering any harm, that its DNS64s 
>> _translate IPv4 
>> mapped address prefixes they receive into their ISP specific NAT64 
>> prefixes_.
>>
>> With DNS64s doing as proposed in 2., DNSsec compatibility is still 
>> broken, but not more than without a WKP.
>>
>> DNSsec deployment being likely to take enough time to prepare a more 
>> complete solution, as described below.
>>
>>
>> (C) Finally, here is how to eventually restore DNSsec compatibility.
>>
>> - Before DNSsec with NAT64s becomes important, make sure that:
>>   o TCP/IP dual stacks don't discard packets whose destination is the 
>> mapped address when IPv4 is not enabled, patching them where 
>> necessary. 
>>   (some stacks discarding these packets have been seen to exist).
>>   o firewalls that discard these packets by default can be configured 
>> not to do it.
>> - Then IPv6-only ISPs can:
>>   o ensure that routes to their NAT64s exist for the mapped 
>> address prefix
>>   o disable the translation of mapped addresses prefixes into 
>> ISP-specific prefixes.
>>
>> The end result is that IPv4-only servers, that have advertised their 
>> mapped address in their DNSsec capable DNS servers (possibly 
>> a long time 
>> ago) become accessible by IPv6-only hosts _that rely on DNSsec_.
>>
>> Isn't this an interesting promise?
>>
>> Regards,
>> RD
>>
>>
> 
> 


From dwing@cisco.com  Tue Apr 28 10:54:16 2009
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From: "Dan Wing" 
To: "=?iso-8859-1?Q?'R=E9mi_Despr=E9s'?=" 
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Cc: 'Behave WG' , 'Keith Moore' , 'Xing Li' , 'Fred Baker' 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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> -----Original Message-----
> From: R=E9mi Despr=E9s [mailto:remi.despres@free.fr]=20
> Sent: Monday, April 27, 2009 11:35 PM
> To: Dan Wing
> Cc: 'Iljitsch van Beijnum'; 'Behave WG'; 'Xing Li'; 'Keith=20
> Moore'; 'Marcello Bagnulo Braun'; 'Fred Baker'
> Subject: Re: [BEHAVE] Question on embedded address format in=20
> draft-baker-behave-v4v6-framework-02
>=20
> Dan,
>=20
> At the end of a discussion in 2002 on Itojun's draft, Erik Nordmark=20
> wrote in www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00263:
> "An implementation needs to be configured to either be IPv6-only or
> dual stack.
> In the dual stack case the mapped addresses at the API correspond
> to IPv4 packets on the wire.
> In the IPv6-only case the mapped addresses at the API correspond
> to IPv6 packets on the wire next to the node, and on the other side of
> the translator they correspond to IPv4 packets."
>=20
> I agree with this.
>=20
> Note that this statement received no objection in 2002, and that=20
> Itojun's didn't issue a -01 version of his draft.

More recently, when the question of v4-mapped addresses came up=20
Iljitsch ran some tests which Marcelo reported on here:

http://www.ietf.org/mail-archive/web/int-area/current/msg01476.html

The thread continued for quite awhile, and concluded with additional
tests:

http://www.ietf.org/mail-archive/web/int-area/current/msg01515.html
http://www.ietf.org/mail-archive/web/int-area/current/msg01516.html

in that last message (msg01516.html), Iljitsch wrote:

    ...
    >
    >  Conclusions: using the v4-mapped prefix requires changes
    >  for at least some OSes, and probably all or most. Using
    >  the v4-compatible prefix has the advantage that RFC 3484
    >  compatible systems prefer real/normal IPv6 addresses, but
    >  then this would be true for any prefix that is "far" from
    >  the currently used global unicast space (2000::/3), i.e.,
    >  in ::/3 or 4000:/2.
    >
    >  Based on this, I'd say that it doesn't make much sense to
    >  use either of these prefixes for NAT64, but either to use
    >  addresses out of service provider ranges, which has the
    >  downside that configuration is necessary, or define a new
    >  well-known, non-globally-routable prefix for this purpose
    >  which should work without configuration or host changes
    >  (and be less preferred than real AAAA records on RFC 3484
    >  compatible systems, which is most of them apart from
    >  MacOS) and additional benefits can be gained by changes in
    >  the host OS and/or applications.
    >
    ...


Based on that previous discussion (which I admit not everyone
may have seen, as we had a lot of discussion on various mailing
lists in the past):

I believe you saying that such changes to host OSs should be
re-considered to be acceptable/necessary for those 6/4 translation
scenarios where a well-known prefix can be used (i.e., scenario
1: IPv6 network to IPv4 Internet scenario, and scenario 5: IPv6=20
network to IPv6 network), so that we can re-use the well-known=20
prefix of ::ffff/96 for 6/4 translation.

-d


From remi.despres@free.fr  Wed Apr 29 00:45:19 2009
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Cc: 'Behave WG' , 'Keith Moore' , 'Xing Li' , 'Fred Baker' 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Dan Wing  -  le (m/j/a) 4/28/09 7:55 PM:
> More recently, when the question of v4-mapped addresses came up 
> Iljitsch ran some tests which Marcelo reported on here:
> 
> http://www.ietf.org/mail-archive/web/int-area/current/msg01476.html
> 
> The thread continued for quite awhile, and concluded with additional 
> tests:
> 
> http://www.ietf.org/mail-archive/web/int-area/current/msg01515.html 
> http://www.ietf.org/mail-archive/web/int-area/current/msg01516.html

Thanks for the reference.
Further comment below.

> in that last message (msg01516.html), Iljitsch wrote:

>> Conclusions: using the v4-mapped prefix requires changes for at 
>> least some OSes, and probably all or most. Using the v4-compatible
>>  prefix has the advantage that RFC 3484 compatible systems prefer 
>> real/normal IPv6 addresses, but then this would be true for any 
>> prefix that is "far" from the currently used global unicast space 
>> (2000::/3), i.e., in ::/3 or 4000:/2.

If these OSes send mapped addresses on the wire when their dual stack
has IPv4 enabled, they don't comply with RFC 2553 sec 3.7:
  "Applications may use PF_INET6 sockets to open TCP connections to IPv4
nodes, or send UDP packets to IPv4 nodes, by simply encoding the
destination's IPv4 address as an IPv4-mapped IPv6 address, and
passing that address, within a sockaddr_in6 structure, in the
connect() or sendto() call."

IMHO, they have to be fixed because, by not complying, they prevent
NAT64s and DNSsec can be reconciled as described in
www.ietf.org/mail-archive/web/behave/current/msg05890.

>> Based on this, I'd say that it doesn't make much sense to use 
>> either of these prefixes for NAT64, but either to use addresses out
>>  of service provider ranges, which has the downside that 
>> configuration is necessary, or define a new well-known, 
>> non-globally-routable prefix for this purpose which should work 
>> without configuration or host changes (and be less preferred than 
>> real AAAA records on RFC 3484 compatible systems, which is most of
>>  them apart from MacOS) and additional benefits can be gained by 
>> changes in the host OS and/or applications.

I agree that, before all main OSes are aligned with the above paragraph 
of RFC 2553, it would be premature to advertise mapped AAAAs in DNS 
servers of IPv4-only servers.

But, fortunately, the need for such advertisements comes only when, 
DNSsec being largely deployed, it becomes useful to reconcile NAT64s 
with it. This is not very soon.

The important point though, is IMHO that, in addition to alignment of 
OSes with RFC 2553, DNS64s SHOULD in the short term replace mapped 
addresses by addresses in the provider range, so that:
- they work well in the short term
- they are ready for mapped AAAAs starting to be deployed (by mistake in 
the short term, on purpose when DNSsec is deployed).

These DNS64s should also be ready to disable this replacement when 
DNSsec compatibility becomes desirable.

> Based on that previous discussion (which I admit not everyone may 
> have seen, as we had a lot of discussion on various mailing lists in
>  the past):
> 
> I believe you saying that such changes to host OSs should be 
> re-considered to be acceptable/necessary for those 6/4 translation 
> scenarios where a well-known prefix can be used (i.e., scenario 1: 
> IPv6 network to IPv4 Internet scenario, and scenario 5: IPv6 network
>  to IPv6 network), so that we can re-use the well-known prefix of 
> ::ffff/96 for 6/4 translation.

Yes, to permit DNSsec in the IPv6 to IPv4 scenario without disturbing 
OSes that already comply with RFC2553.
(I didn't get the point about IPv6 to IPv6, but the first one stands for 
itself.)

Regards,

RD

From iljitsch@muada.com  Wed Apr 29 11:34:08 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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On 29 apr 2009, at 9:46, R=E9mi Despr=E9s wrote:

> If these OSes send mapped addresses on the wire when their dual stack
> has IPv4 enabled, they don't comply with RFC 2553 sec 3.7:

They don't, they send IPv4 packets, if anything.

> The important point though, is IMHO that, in addition to alignment =20
> of OSes with RFC 2553, DNS64s SHOULD in the short term replace =20
> mapped addresses by addresses in the provider range

So what you want is that:

1. ::ffff:0:0/96 becomes the NAT64 WKP
2. People running IPv4-only hosts put ::ffff:a.b.c.d AAAA records in =20
the DNS
3. People running IPv6-only deploy NAT64s and DNS64s
4. DNS64s translate these AAAA records into a local (provider address =20=

space) NAT64 AAAA record

But what about people who run dual stack, and thus have no use for =20
NAT64 and thus not for a DNS64? They would see the ::ffff:0:0/96 =20
addresses, which may get them to send normal IPv4 packets but there's =20=

also a good change that it won't. For instance, the "mapped on the =20
wire harmful" meme has been percolating for half a decade and I'm =20
willing to bet that at least the NetBSD people filter this out in some =20=

way.

Also, this is completely unnecessary. The DNS64 can create the fake =20
AAAA records from the A records just as easily as from mapped AAAA =20
records, and:

> These DNS64s should also be ready to disable this replacement when =20
> DNSsec compatibility becomes desirable.

A much simpler way to be compatible with DNSSEC is to simply update =20
the DNSSEC validators. Since the DNS64 functionality is new, having an =20=

integrated DNS64/DNSSEC validator is not a deployment issue. DNSSEC =20
validation on the hosts is virtually non-existant, so requiring an =20
update to those is not the worst thing in the world and certainly =20
easier than upgrading all IPv6 stacks to change their mapped address =20
behavior.

Note by the way that the idea of mapping the ::ffff:0:0/96 prefix to =20
the NAT64 prefix has some merit, I've suggested things along these =20
lines a while ago. If a host doesn't have IPv4 connectivity it could =20
perform this mapping, which has the advantage that real A records can =20=

be used and that the host thinks it's doing IPv4, not IPv6, so it can =20=

do stuff like enabling IPv4 NAT traversal. But this should be done in =20=

the host, which knows if there is IPv4 connectivity or not.

On the other hand, may as well use the softwire stuff for this...


From xuxh@huawei.com  Wed Apr 29 17:58:11 2009
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Date: Thu, 30 Apr 2009 08:59:14 +0800
From: Xu Xiaohu 
To: 'Behave WG' 
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Subject: Re: [BEHAVE] New Version Notification for draft-xu-behave-nat64-standby-00
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Hi all,

I have just submitted a draft about the redundancy and load balance
mechanisms of NAT64
(http://tools.ietf.org/html/draft-xu-behave-nat64-standby-00). Both cold
standby and hot standby mechanisms are desbribed in this draft. These
redundancy mechanisms are able to keep the switchover of the NAT64 boxes
transparent to the hosts, especially to the IPv6 hosts. The cold standby
mechanism doesn't need the mapping states to be synchronized among the =
NAT64
boxes. With this mechanism, the already established connections (e.g., =
TCP
connections) will be interrupted due to the switchover of NAT64 boxes, =
but
later they can be re-established without the notice of applications on =
the
communicating hosts. The hot standby mechanism  in contrast, requires =
the
mapping states to be synchronized in a timely fashion among the involved
NAT64 boxes. With this mechanism, the already established connections =
can be
preserved even when the switchover of NAT64 boxes occurs.=20

On the basis of the standby mechanisms mentioned above, we can further
realize load balance among a set of NAT64 boxes. The basic idea is as
follows: these NAT64 boxes use two prefixe64s(e.g., prefix64-A and
prefix64-B), and one box is designated as the Master for prefix64-A and =
the
Backup for prefix64-B and the other as the Backup for prefix64-A and the
Master for prefix64-B, and half of the IPv6 hosts use prefix64-A and =
half
are using prefix64-B. In this way, the IPv6 packets towards IPv4 network =
is
balanced among a set of NAT64 boxes according to their destination =
addresses
with different prefix64.

Any comment is appreciated.

Xiaohu=20

> -----=D3=CA=BC=FE=D4=AD=BC=FE-----
> =B7=A2=BC=FE=C8=CB: IETF I-D Submission Tool =
[mailto:idsubmission@ietf.org]=20
> =B7=A2=CB=CD=CA=B1=BC=E4: 2009=C4=EA4=D4=C229=C8=D5 20:29
> =CA=D5=BC=FE=C8=CB: xuxh@huawei.com
> =D6=F7=CC=E2: New Version Notification for =
draft-xu-behave-nat64-standby-00
>=20
>=20
> A new version of I-D, draft-xu-behave-nat64-standby-00.txt=20
> has been successfuly submitted by Xiaohu Xu and posted to the=20
> IETF repository.
>=20
> Filename:	 draft-xu-behave-nat64-standby
> Revision:	 00
> Title:		 Redundancy and Load Balance Mechanism of NAT64
> Creation_date:	 2009-04-29
> WG ID:		 Independent Submission
> Number_of_pages: 9
>=20
> Abstract:
> NAT64 [NAT64], a simplified NAT-PT [RFC2766] without DNS-ALG,=20
> provides a method for IPv6 hosts to initiate communications=20
> with IPv4 hosts. This memo defines several mechanisms=20
> supporting redundancy and load balance amongst NAT64 boxes.=20
>=20
> Conventions used in this document=20
>=20
> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL=20
> NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and=20
> "OPTIONAL" in this document are to be interpreted as=20
> described in RFC-2119 [RFC2119].
>                                                              =20
>                    =20
>=20
>=20
> The IETF Secretariat.
>=20
>=20


From dwing@cisco.com  Wed Apr 29 18:49:54 2009
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Cc: 'Behave WG' 
Subject: [BEHAVE] BEHAVE interim teleconference
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Hi.

On Wednesday, May 20, 7:00-9:00am Pacific Daylight Time, BEHAVE will be having
a teleconference interim meeting, with the following agenda:

   * 6/4 translation document organization
   * 6/4 translation on a host
   * DNS-ALG open issues
   * translation open issues (e.g., fragmentation)

Thanks,
-d


From dwing@cisco.com  Wed Apr 29 18:50:03 2009
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Cc: behave-chairs@tools.ietf.org, 'Dave Thaler' 
Subject: [BEHAVE] working group status update
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An update on BEHAVE's status:

Working Group document progress:
  - draft-baker-behave-v4v6-framework is undergoing editing and will
    become the working group's Framework document.
  - draft-baker-behave-v4v6-translation is undergoing editing and will
    become the working group's header translation document, replacing
    RFC2765 (Stateless IP/ICMP Translation Algorithm (SIIT))
  - The 5 authors of draft-xli-behave-v4v6-prefix and
    draft-miyata-behave-prefix64 are going to co-author a forthcoming
    working group document which will be based on
    draft-xli-behave-v4v6-prefix-00.

Milestone progress:
   - The chairs are working on new milestones and dates.

   - We will be proposing September, 2008, to finish WGLC and submit
     the following documents to IESG:
       * Framework
       * 6/4 translation
       * stateful 6/4 translation
       * DNS rewriting function

   - We will be proposing November, 2008 for:
       * FTP-ALG
       * Prefix

Interim meeting:
  - On Wednesday, May 20, 7:00-9:00am Pacific Daylight Time, 
    BEHAVE will be having a teleconference interim meeting, 
    with the following agenda:

     * 6/4 translation document organization
     * 6/4 translation on a host
     * DNS-ALG open issues
     * translation open issues (e.g., fragmentation)

    (which I just sent to the IESG secretary to send 
     the official announcement.)


If you have comments please send them to the list or to the chairs.

-Dan and Dave



From remi.despres@free.fr  Thu Apr 30 00:18:22 2009
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Cc: Behave WG 
Subject: Re: [BEHAVE] Question on embedded address format in draft-baker-behave-v4v6-framework-02
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Iljitsch van Beijnum  -  le (m/j/a) 4/29/09 8:34 PM:
> On 29 apr 2009, at 9:46, Rémi Després wrote:
> 
>> If these OSes send mapped addresses on the wire when their dual
>> stack has IPv4 enabled, they don't comply with RFC 2553 sec 3.7:
> 
> They don't, they send IPv4 packets, if anything.

Good remark.
A better statement to support the proposal could have been:
"If they have IPv4 enabled, dual stack OSes that comply with RFC 2553 
sec 3.7 send IPv4 packets when  mapped-address destinations are 
presented to their IPv6 socket interfaces".


>> The important point though, is IMHO that, in addition to alignment
>> of OSes with RFC 2553, DNS64s SHOULD in the short term replace
>> mapped addresses by addresses in the provider range
> 
> So what you want is that:
> 
> 1. ::ffff:0:0/96 becomes the NAT64 WKP 2. People running IPv4-only
> hosts put ::ffff:a.b.c.d AAAA records in the DNS 3. People running
> IPv6-only deploy NAT64s and DNS64s 4. DNS64s translate these AAAA
> records into a local (provider address space) NAT64 AAAA record

Yes, this is what I propose, with a few more details on when to do what, 
in a previous answer to Keith Moore (ref. 
www.ietf.org/mail-archive/web/behave/current/msg05890).


> 
> But what about people who run dual stack, and thus have no use for
> NAT64 and thus not for a DNS64? They would see the ::ffff:0:0/96
> addresses, which may get them to send normal IPv4 packets but there's
> also a good change that it won't.

- If they have IPv4 enabled they don't need NAT64.
- If they only their non-updated OSes are assigned only IPv6 addresses 
without having also NAT64s and DNS64s operational, they have no way to 
reach IPv4-only hosts, independently of which DNS RRs are where.

(If an IPv6-only network has to permit non-updated hosts to reach 
IPv4-only servers, it MUST have NAT64s and DNS64s.)

> For instance, the "mapped on the wire harmful" meme has been
> percolating for half a decade and I'm willing to bet that at least
> the NetBSD people filter this out in some way.

This may be the case, but, if my proposal is accepted, this can be fixed 
before mapped DNS64s need to stop translating mapped AAAAs into ISP 
specific NAT64 prefixes (i.e. before IPv6-only to IPv4 connectivity has 
to be reconciled with DNSsec).


> Also, this is completely unnecessary. The DNS64 can create the fake
> AAAA records from the A records just as easily as from mapped AAAA
> records,
> 
>> These DNS64s should also be ready to disable this replacement when 
>> DNSsec compatibility becomes desirable.

1. The proposal is not that DNS64s stop making synthetic AAAAs with 
ISP-specific prefixes when they do it with received As, it is that they 
ALSO do it with received AAAAs.

2. In my understanding, if (1) DNS64s stop making synthetic AAAAs, (2)
IPv4-only servers have no AAAAs in their DNS servers, then IPv6-only to 
IPv4-only connectivity is broken.


> A much simpler way to be compatible with DNSSEC is to simply update
> the DNSSEC validators. Since the DNS64 functionality is new, having
> an integrated DNS64/DNSSEC validator is not a deployment issue.
> DNSSEC validation on the hosts is virtually non-existant, so
> requiring an update to those is not the worst thing in the world and
> certainly easier than upgrading all IPv6 stacks to change their
> mapped address behavior.

In my understanding, if an intermediate DNS64 makes synthetic AAAAs, it 
necessarily breaks the DNSsec provided guarantee that an RR that is 
received does come from the DNS server of the host it points to.


> Note by the way that the idea of mapping the ::ffff:0:0/96 prefix to
> the NAT64 prefix has some merit, I've suggested things along these
> lines a while ago.

This IMHO supports that time has come to revisit this subject, to be 
sure very carefully, but without any paralyzing taboo.


> If a host doesn't have IPv4 connectivity it could perform this
> mapping, which has the advantage that real A records can be used and
> that the host thinks it's doing IPv4, not IPv6, so it can do stuff 
> like enabling IPv4 NAT traversal. But this should be done in the
> host, which knows if there is IPv4 connectivity or not.
> 
> On the other hand, may as well use the softwire stuff for this...

The SAM approach is proposed separately is IMHO in this direction, but 
this is another objective. The scenario for which specification of 
NAT64s and DNS64s is considered is, in my understanding, that of 
IPv4-only servers being reached by non-updated IPv6-only hosts 
(including by non-updated dual stack hosts having IPv6-only addresses).

Regards,

RD


From magnus.westerlund@ericsson.com  Thu Apr 30 05:55:23 2009
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Subject: Re: [BEHAVE] Last Call: draft-ietf-behave-nat-behavior-discovery (NAT	Behavior Discovery Using STUN) to Experimental RFC
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Hi,

After having reviewed all the last call comments I like to make a
consensus call on this document.

I think there is rough consensus for publication of this document given
that it is updated to make the following clear:

- Make the applicability statement more clear on that any determination
is transient and may contain error requiring a user to have a fall back.

- Make the proposed experiments clearer on how they can utilize the
mechanism. Especially the P2P needs to make clear why this could be
applicable given the limitations.

- Make clear that the algorithms are proposals of what can be determined
using the STUN attributes and their behaviors. Additional determinations
are possible.

Best Regards

Magnus


>> On Mar 10, 2009, at 8:44 AM, The IESG wrote:
>>
>>> The IESG has received a request from the Behavior Engineering for
>>> Hindrance Avoidance WG (behave) to consider the following document:
>>>
>>> - 'NAT Behavior Discovery Using STUN '
>>>    as an Experimental
>>> RFC
>>>
>>> The IESG plans to make a decision in the next few weeks, and solicits
>>> final comments on this action.  Please send substantive comments to the
>>> ietf@ietf.org mailing lists by 2009-03-31. Exceptionally,
>>> comments may be sent to iesg@ietf.org instead. In either case, please
>>> retain the beginning of the Subject line to allow automated sorting.
>>>
>>> The file can be obtained via
>>> http://www.ietf.org/internet-drafts/draft-ietf-behave-nat-behavior-discovery-06.txt
>>>
>>>
>>>
>>> IESG discussion can be tracked via
>>> https://datatracker.ietf.org/public/pidtracker.cgi?command=view_id&dTag=15728&rfc_flag=0
>>>
>>>
>>> The following IPR Declarations may be related to this I-D:
>>>
>>> https://datatracker.ietf.org/ipr/919/
>>> https://datatracker.ietf.org/ipr/945/
>>>
>>>
>>> _______________________________________________
>>> Behave mailing list
>>> Behave@ietf.org
>>> https://www.ietf.org/mailman/listinfo/behave
>>
> 
> 


-- 

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  +46 10 7148287
Färögatan 6                | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------

From dwing@cisco.com  Thu Apr 30 12:28:04 2009
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From: "Dan Wing" 
To: "'Behave WG'" 
References: 
Date: Thu, 30 Apr 2009 12:29:26 -0700
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Cc: behave-chairs@tools.ietf.org, 'Dave Thaler' 
Subject: Re: [BEHAVE] working group status update
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Several people pointed out that I had omitted a few other working group
documents.  Sorry about that.  Here is an update on those other documents:

* draft-bagnulo-behave-dns64 is being revised, and is expected to be
  the working group's 'DNS rewriting function' document.

* draft-bagnulo-behave-nat64 is being revised, and is expected to be
  the working group's 'stateful translation' document.

* TURN is held on two DISCUSSes (from Tim Polk and Cullen Jennings), 
  which Philip is hoping to clear in a week.  Details:
  https://datatracker.ietf.org/idtracker/ballot/2322/
  https://datatracker.ietf.org/idtracker/draft-ietf-behave-turn/

* TURN-v6 is waiting for TURN to finish.

* TURN-URI is waiting for a revision from the author.

* Behavior Discovery:  Magnus sent a consensus call to the
  mailing list today (April 30).

* no update on SCTPNAT.

* no update on TURN-TCP.


I am trying to get most of this information reflected in
http://tools.ietf.org/wg/behave but am struggling with the 
tool.

-d


> -----Original Message-----
> From: Dan Wing [mailto:dwing@cisco.com] 
> Sent: Wednesday, April 29, 2009 6:51 PM
> To: 'Behave WG'
> Cc: 'Dave Thaler'; 'Magnus Westerlund'; 'behave-chairs@tools.ietf.org'
> Subject: working group status update
> 
> An update on BEHAVE's status:
> 
> Working Group document progress:
>   - draft-baker-behave-v4v6-framework is undergoing editing and will
>     become the working group's Framework document.
>   - draft-baker-behave-v4v6-translation is undergoing editing and will
>     become the working group's header translation document, replacing
>     RFC2765 (Stateless IP/ICMP Translation Algorithm (SIIT))
>   - The 5 authors of draft-xli-behave-v4v6-prefix and
>     draft-miyata-behave-prefix64 are going to co-author a forthcoming
>     working group document which will be based on
>     draft-xli-behave-v4v6-prefix-00.
> 
> Milestone progress:
>    - The chairs are working on new milestones and dates.
> 
>    - We will be proposing September, 2008, to finish WGLC and submit
>      the following documents to IESG:
>        * Framework
>        * 6/4 translation
>        * stateful 6/4 translation
>        * DNS rewriting function
> 
>    - We will be proposing November, 2008 for:
>        * FTP-ALG
>        * Prefix
> 
> Interim meeting:
>   - On Wednesday, May 20, 7:00-9:00am Pacific Daylight Time, 
>     BEHAVE will be having a teleconference interim meeting, 
>     with the following agenda:
> 
>      * 6/4 translation document organization
>      * 6/4 translation on a host
>      * DNS-ALG open issues
>      * translation open issues (e.g., fragmentation)
> 
>     (which I just sent to the IESG secretary to send 
>      the official announcement.)
> 
> 
> If you have comments please send them to the list or to the chairs.
> 
> -Dan and Dave
> 
>