From nobody Fri Oct 25 04:32:50 2019 Return-Path: X-Original-To: tram@ietfa.amsl.com Delivered-To: tram@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E19C12086F for ; Fri, 25 Oct 2019 04:32:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.498 X-Spam-Level: X-Spam-Status: No, score=-1.498 tagged_above=-999 required=5 tests=[BAYES_50=0.8, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Xyc810o15hXl for ; Fri, 25 Oct 2019 04:32:46 -0700 (PDT) Received: from mork.alvestrand.no (mork.alvestrand.no [158.38.152.117]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 84D0612007C for ; Fri, 25 Oct 2019 04:32:46 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mork.alvestrand.no (Postfix) with ESMTP id 039987C381F; Fri, 25 Oct 2019 13:32:44 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at alvestrand.no Received: from mork.alvestrand.no ([127.0.0.1]) by localhost (mork.alvestrand.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Lt8q5fmP61Ee; Fri, 25 Oct 2019 13:32:42 +0200 (CEST) Received: from [192.168.3.208] (unknown [188.113.75.166]) by mork.alvestrand.no (Postfix) with ESMTPSA id 02FF27C326B; Fri, 25 Oct 2019 13:32:41 +0200 (CEST) To: tram@ietf.org From: Harald Alvestrand Cc: iana@iana.org Message-ID: <0446c096-7efd-872e-5f9b-7ad42f249b6c@alvestrand.no> Date: Fri, 25 Oct 2019 13:32:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Archived-At: Subject: [tram] IANA considerations in draft-ietf-tram-stunbis X-BeenThere: tram@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussing the creation of a Turn Revised And Modernized \(TRAM\) WG, which goal is to consolidate the various initiatives to update TURN and STUN." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Oct 2019 11:32:48 -0000 This is defintely not what you want to hear when a document is in AUTH48.... I wanted to write a request for a new STUN attribute today, and found that the registry pointed to the -stunbis draft for IANA instruction. On reading, I found that the instructions (such as they were; they weren't much) had been left behind in RFC 5389, which this draft was supposed to obsolete. Even the statement that the C000-FFFF range was "designatd expert" was missing. What should we do about this? Harald From nobody Fri Oct 25 13:00:50 2019 Return-Path: X-Original-To: tram@ietfa.amsl.com Delivered-To: tram@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A3D4E12004F for ; Fri, 25 Oct 2019 13:00:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6-Ut3hkSZTqd for ; Fri, 25 Oct 2019 13:00:46 -0700 (PDT) Received: from mail-io1-xd2b.google.com (mail-io1-xd2b.google.com [IPv6:2607:f8b0:4864:20::d2b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B3AA31200C4 for ; Fri, 25 Oct 2019 13:00:46 -0700 (PDT) Received: by mail-io1-xd2b.google.com with SMTP id 1so3793863iou.4 for ; Fri, 25 Oct 2019 13:00:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kPF5q7EWLjf5ERx9Z53puW9+iwMjvLGWNaSVJURw5xQ=; b=UrxXd5UqU7w2M5nj0as1XQIuvPmPriVn720rc5PXkGFVHg91GsZjq9nAwvm7i3Y+r5 PgBb7JmYgGpwqjeOIlwkahxTa9vKTBU9Oz7xutIP815AkEglhz1OjZvFFXdcxS4rTEJB iATCv+N4USpkUsf/XVosuviYaIhon02gNeKRLcZtbxX7JIYYQVJmQqfgM08pC0dnwukX IlniL9YPOjs/+e/XVdU+RwxhKES7IgeHxmwe+LPxJUb+bLePWOeKCXH2zSw4vr9czxRh 3oJfmM95gb9Q9WzW17TCL43jCAPMspmdvpWGzv2WBQG6QERpi6bvFaHUF9yUBEJYqOdY iEEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kPF5q7EWLjf5ERx9Z53puW9+iwMjvLGWNaSVJURw5xQ=; b=DHhl+Tol6JRcGwViZMhOgyZNzTDSQIfYCytC4yw9YLG5sFFDlYbsOTm19DeVzkA1YR 9yfF9fkgI0dncNW5ymVuO/ZESIRoczx68u3kWjniLpTVjETzQXH+vINutiupqHILnMrj I8ab2J3l0+Ofy/ayWAT8QI69supNYZn07ZqzcbP5bS0aB5s+OUpSEBN863gNL/wQpuLz X1Dsbf94S0OOzjBhy/Ge3jRJI2JbOHs5oKEyYBBjIXioNH5sDmOpKEHm4/xYtn8hSuOz yewAT4fk1M5k91ivBsCd/L0obEg6ib9s/Oyrxtmta3Kyuo8jxpe48A205ufRLijgoy0X zbfw== X-Gm-Message-State: APjAAAUyrsi52g7xhhJHtgOfyRDtneFT3kzXnkZf6/R3W2wLPP8CE0ko mcun2InsbofiwK3N++gjS0+yEH6H175O2waa5HE= X-Google-Smtp-Source: APXvYqyA7vuzWRnO+WUFFP3VuQvWmllcTlkzERbVEVWDYl27cLB4qobf9I9x5LoKcuAnRx6QyxNgeKFAtKaD4391jWI= X-Received: by 2002:a5d:9057:: with SMTP id v23mr5440379ioq.119.1572033645764; Fri, 25 Oct 2019 13:00:45 -0700 (PDT) MIME-Version: 1.0 References: <0446c096-7efd-872e-5f9b-7ad42f249b6c@alvestrand.no> In-Reply-To: <0446c096-7efd-872e-5f9b-7ad42f249b6c@alvestrand.no> From: Ted Hardie Date: Fri, 25 Oct 2019 13:00:19 -0700 Message-ID: To: Harald Alvestrand Cc: tram@ietf.org, iana@iana.org Content-Type: multipart/alternative; boundary="00000000000007e3b70595c19ba7" Archived-At: Subject: Re: [tram] IANA considerations in draft-ietf-tram-stunbis X-BeenThere: tram@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussing the creation of a Turn Revised And Modernized \(TRAM\) WG, which goal is to consolidate the various initiatives to update TURN and STUN." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Oct 2019 20:00:49 -0000 --00000000000007e3b70595c19ba7 Content-Type: text/plain; charset="UTF-8" On Fri, Oct 25, 2019 at 4:32 AM Harald Alvestrand wrote: > This is defintely not what you want to hear when a document is in > AUTH48.... > > I wanted to write a request for a new STUN attribute today, and found > that the registry pointed to the -stunbis draft for IANA instruction. > > > On reading, I found that the instructions (such as they were; they > weren't much) had been left behind in RFC 5389, which this draft was > supposed to obsolete. Even the statement that the C000-FFFF range was > "designatd expert" was missing. > > > What should we do about this? > > A short document that copies them out of RFC 5389 but doesn't change them? Ted > > Harald > > > _______________________________________________ > tram mailing list > tram@ietf.org > https://www.ietf.org/mailman/listinfo/tram > --00000000000007e3b70595c19ba7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Fri, Oct 25, 2019 at 4:32 AM Harald Al= vestrand <harald@alvestrand.no> wrote:
This is defintely not what you want to hear when a= document is in AUTH48....

I wanted to write a request for a new STUN attribute today, and found
that the registry pointed to the -stunbis draft for IANA instruction.


On reading, I found that the instructions (such as they were; they
weren't much) had been left behind in RFC 5389, which this draft was supposed to obsolete. Even the statement that the C000-FFFF range was
"designatd expert" was missing.
=C2=A0

What should we do about this?



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Tue, 29 Oct 2019 14:51:50 +0000 From: Magnus Westerlund To: "ted.ietf@gmail.com" , "harald@alvestrand.no" CC: "tram@ietf.org" , "iana@iana.org" Thread-Topic: [tram] IANA considerations in draft-ietf-tram-stunbis Thread-Index: AQHViyf3um23XopqrE2EPXJ6xojffqdrx1eAgAXzIYA= Date: Tue, 29 Oct 2019 14:51:50 +0000 Message-ID: <7bd4cc4b5afc97b52107ab7130b9690eee2a195c.camel@ericsson.com> References: <0446c096-7efd-872e-5f9b-7ad42f249b6c@alvestrand.no> In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=magnus.westerlund@ericsson.com; x-originating-ip: [192.176.1.83] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d77a94b5-4abc-4fb2-fdec-08d75c7f8805 x-ms-traffictypediagnostic: HE1PR0701MB2362: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 0205EDCD76 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(136003)(376002)(39860400002)(366004)(396003)(346002)(199004)(189003)(6486002)(7736002)(305945005)(36756003)(99286004)(229853002)(6506007)(478600001)(76176011)(53546011)(6436002)(14444005)(81166006)(81156014)(256004)(8676002)(8936002)(2906002)(118296001)(5660300002)(99936001)(86362001)(25786009)(91956017)(486006)(71190400001)(71200400001)(6246003)(3846002)(2616005)(102836004)(476003)(2501003)(11346002)(446003)(44832011)(14454004)(110136005)(66066001)(4001150100001)(6512007)(76116006)(4326008)(186003)(6116002)(316002)(66946007)(66556008)(66616009)(6306002)(66446008)(64756008)(66476007)(26005)(966005)(54906003); DIR:OUT; SFP:1101; SCL:1; SRVR:HE1PR0701MB2362; H:HE1PR0701MB2697.eurprd07.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:3; MX:3; received-spf: None (protection.outlook.com: ericsson.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: uRYhF2C8MLhhZOua7139PkAV7cHaikSXF9bHjnjDf2DZ0bmPACkJuONlyoEWkvFb3ra1UYvUUdrNgPI3uaKVK4MGCjLTMGCsMMZgEkIhTvutC0mW/EWnjy7+URd0pVf1zb5FmzHq4a070ooGhWgS24vl26TnlUGF5K4VGlZjQsrz97w7wOFeSjsIcqwcpR7WOtyWLacuKIQcrQiqzSx3i/C/byc0JQx9DKSIQLp6As9xbJW4EqMoapcVpR31FjrAR4rpHqcJANpSab7xKw6aGmdDKwqQ+EltX0hNuuILD9zje9IYkoM/3/FEZw6kr9hBtZoEq8H3vmMsfe55Trg2aTdbc10l4HN0Z7ci0ZaL1yt5pF0R4KbPB7tUGhWAvEzf8wqaFBu+WTrBCiZnwSQdbzKjtGh/mJS83adnBk9o1Hi79J4bKM2IozBv63feCIHl x-ms-exchange-transport-forked: True Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-B7o1odd5TCvE6ZjPXq93" MIME-Version: 1.0 X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-Network-Message-Id: d77a94b5-4abc-4fb2-fdec-08d75c7f8805 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Oct 2019 14:51:50.7091 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 0m/Udg3P2K6T5Ol7kHvCgFO91HYlFCYMfY1/VUqfvIYYHvroTOUUDAoYaMe1EN//ukTOMYmitQigGQDA8mdfqRfNPdAAItqteS0dep+Eppg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0701MB2362 Archived-At: Subject: Re: [tram] IANA considerations in draft-ietf-tram-stunbis X-BeenThere: tram@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussing the creation of a Turn Revised And Modernized \(TRAM\) WG, which goal is to consolidate the various initiatives to update TURN and STUN." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Oct 2019 14:51:58 -0000 --=-B7o1odd5TCvE6ZjPXq93 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, As the document is still in AUTH48 and have been for a long time, we could actually address it by copy the registry definition parts into the stunbis.= I will flag the RFC-editor to hold to document while we figure it out.=20 Cheers Magnus Westerlund On Fri, 2019-10-25 at 13:00 -0700, Ted Hardie wrote: > On Fri, Oct 25, 2019 at 4:32 AM Harald Alvestrand > wrote: > > This is defintely not what you want to hear when a document is in AUTH4= 8.... > >=20 > > I wanted to write a request for a new STUN attribute today, and found= =20 > > that the registry pointed to the -stunbis draft for IANA instruction. > >=20 > >=20 > > On reading, I found that the instructions (such as they were; they=20 > > weren't much) had been left behind in RFC 5389, which this draft was= =20 > > supposed to obsolete. Even the statement that the C000-FFFF range was= =20 > > "designatd expert" was missing. > > =20 > > What should we do about this? > >=20 >=20 > A short document that copies them out of RFC 5389 but doesn't change them= ? >=20 > Ted > =20 > > Harald > >=20 > >=20 > > _______________________________________________ > > tram mailing list > > tram@ietf.org > > https://www.ietf.org/mailman/listinfo/tram >=20 > _______________________________________________ > tram mailing list > tram@ietf.org > https://www.ietf.org/mailman/listinfo/tram --=20 Cheers Magnus Westerlund=20 ---------------------------------------------------------------------- Networks, Ericsson Research ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Torshamnsgatan 23 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- --=-B7o1odd5TCvE6ZjPXq93 Content-Type: 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\(3445.104.11\)) Date: Wed, 30 Oct 2019 22:43:33 -0400 In-Reply-To: <74BCBE51-BD93-4376-9D79-10D44174A45E@cisco.com> Cc: "iesg@ietf.org" , "tram-chairs@ietf.org" , "gonzalo.camarillo@ericsson.com" , "tasveren@rbbn.com" , "tram@ietf.org" , "draft-ietf-tram-stun-pmtud@ietf.org" To: "Felipe Garrido (fegarrid)" References: <153793486460.13063.13186763367840598004.idtracker@ietfa.amsl.com> <74BCBE51-BD93-4376-9D79-10D44174A45E@cisco.com> X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [tram] Suresh Krishnan's Discuss on draft-ietf-tram-stun-pmtud-10: (with DISCUSS) X-BeenThere: tram@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussing the creation of a Turn Revised And Modernized \(TRAM\) WG, which goal is to consolidate the various initiatives to update TURN and STUN." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Oct 2019 02:43:42 -0000 --Apple-Mail=_CC4378A0-9916-4D83-86C7-B2AE1B169B33 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Sorry, I just noticed this message. Filtering problem on my gmail = configuration. See below. >> 4.1. Simple Probing Mechanism >> =20 >> The Simple Probing mechanism is implemented by sending a Probe >> Request with a PADDING [RFC5780] attribute over UDP with the DF = bit >> set in the IP header for IPv4 packets and IPv6 packets without >> the Fragment Header included. A router on the path to the server = can >> reject this request with an ICMP message or drop it. > =20 > The router could also forward the 'request' (actually, it's just an IP = packet as far as the router is concerned, it isn't a "request"), so = three things can happen to that packet. > =20 > [FG]. In my opinion this is implicit. Do you think specific language = needs to be added? If so, what do you have in mind? I suppose it's implicit. > Separately, we all know some routers are configured to strip DF bits = (that is, set to zro), and some routers are configured to fragment even = if DF=3D1. Is there implementation guidance we can give to assist = detecting such behavior and learning the real underlying MTU, or should = we ignore that routers do this and would interfere with the MTU learned = by STUN-PMTUD? > =20 > [FG] We=E2=80=99ve discussed this, and while we agree. we feels this = is outside the scope of this document. If you have some (hopefully = short) text that may convey this crisply let us know. Perhaps something like, "Note: routers can be configured to clear the DF bit or ignore the DF = bit which can be difficult or impossible to detect if reassembly occurs = prior to receiving the packet, rendering PMTUD inaccurate." -d > =20 > -d > =20 >=20 >=20 >> =20 >> 4.2.2. Receiving an ICMP Packet >> =20 >> If an ICMP packet "Fragmentation needed" or "Packet Too Big" is = received then this is >> interpreted as a Probe Failure, as defined in [RFC4821] Section = 7.5. >> =20 >> Suresh Krishnan has entered the following ballot position for >> draft-ietf-tram-stun-pmtud-10: Discuss >>=20 >>=20 >>=20 >> Please refer to = https://www.ietf.org/iesg/statement/discuss-criteria.html = >> for more information about IESG DISCUSS and COMMENT positions. >>=20 >>=20 >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-tram-stun-pmtud/ = >>=20 >>=20 >>=20 >> = ---------------------------------------------------------------------- >> DISCUSS: >> = ---------------------------------------------------------------------- >>=20 >> Section 4.1.x and 4.2.x >>=20 >> Please specify how this simple probing mechanism will work with IPv6. = It >> shouldn't be too difficult to do (cleanup references to the DF bit, = use Type 2 >> "Packet Too Big" to identify failures etc.). Similar treatment will = be required >> for the complete probing mechanism as well. >>=20 >>=20 >>=20 >>=20 >>=20 >> =20 >> _______________________________________________ >> tram mailing list >> tram@ietf.org >> https://www.ietf.org/mailman/listinfo/tram = --Apple-Mail=_CC4378A0-9916-4D83-86C7-B2AE1B169B33 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Sorry, I just noticed this message.  Filtering = problem on my gmail configuration.  See below.

4.1.  Simple Probing Mechanism
 
   The = Simple Probing mechanism is implemented by sending a Probe
   = Request with a PADDING [RFC5780] attribute over UDP with the DF = bit
   set in the IP header for IPv4 packets and IPv6 = packets without
   the Fragment Header included.  = A router on the path to the server can
  reject = this request with an ICMP message or drop it.
 
The router could also forward the 'request' (actually, it's = just an IP packet as far as the router is concerned, it isn't a = "request"), so three things can happen to that packet.
 
[FG]. In my opinion this is implicit. Do you think specific = language needs to be added? If so, what do you have in = mind?

I= suppose it's implicit.

Separately,= we all know some routers are configured to strip DF bits (that is, set = to zro), and some routers are configured to fragment even if DF=3D1. =  Is there implementation guidance we can give to assist detecting = such behavior and learning the real underlying MTU, or should we ignore = that routers do this and would interfere with the MTU learned by = STUN-PMTUD?
 
[FG] We=E2=80=99ve discussed this, and = while we agree. we feels this is outside the scope of this document. If = you have some (hopefully short) text that may convey this crisply let us = know.

Perhaps something like,

  "Note: routers can be configured to clear = the DF bit or ignore the DF bit which can be difficult or impossible to = detect if reassembly occurs prior to receiving the packet, rendering = PMTUD inaccurate."

-d

 
-d
 


 
4.2.2.  Receiving an ICMP Packet
 
   If = an ICMP packet "Fragmentation needed" or "Packet Too Big" is received = then this is
   interpreted as a Probe Failure, as defined in = [RFC4821] Section 7.5.
 

Suresh Krishnan has entered the = following ballot position for
draft-ietf-tram-stun-pmtud-10:= Discuss



Please= refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more = information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot = positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-tram-stun-pmtud/



---------------------------------------------------------------= -------
DISCUSS:
---------------------------------------------------------------= -------

Section 4.1.x and 4.2.x

Please specify how this simple probing = mechanism will work with IPv6. It
shouldn't be too = difficult to do (cleanup references to the DF bit, use Type 2
"Packet Too Big" to identify failures etc.). Similar = treatment will be required
for the complete probing = mechanism as well.




 
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