From philip.eardley@bt.com Thu Mar 1 03:01:20 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C70D21F85D2 for ; Thu, 1 Mar 2012 03:01:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.367 X-Spam-Level: X-Spam-Status: No, score=-103.367 tagged_above=-999 required=5 tests=[AWL=0.231, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vSLGYiKOOM+j for ; Thu, 1 Mar 2012 03:01:18 -0800 (PST) Received: from smtpe1.intersmtp.com (smtp64.intersmtp.com [62.239.224.237]) by ietfa.amsl.com (Postfix) with ESMTP id 48C7F21F85D5 for ; Thu, 1 Mar 2012 03:01:18 -0800 (PST) Received: from EVMHT68-UKRD.domain1.systemhost.net (10.36.3.105) by RDW083A008ED64.smtp-e4.hygiene.service (10.187.98.13) with Microsoft SMTP Server (TLS) id 8.3.213.0; Thu, 1 Mar 2012 11:01:17 +0000 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.72]) by EVMHT68-UKRD.domain1.systemhost.net ([10.36.3.105]) with mapi; Thu, 1 Mar 2012 11:01:17 +0000 From: To: Date: Thu, 1 Mar 2012 11:01:16 +0000 Thread-Topic: REMINDER: WG Last call for Multipath TCP API doc Thread-Index: AczidyZSiFWm/o8+TXmYFaJdcgNenAAAAyjwA/BIS7ABWHNMgA== Message-ID: <9510D26531EF184D9017DF24659BB87F331C4B6739@EMV65-UKRD.domain1.systemhost.net> References: <9510D26531EF184D9017DF24659BB87F3317E442F8@EMV65-UKRD.domain1.systemhost.net> <9510D26531EF184D9017DF24659BB87F331BF18819@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331BF18819@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331C4B6739EMV65UKRDdoma_" MIME-Version: 1.0 Subject: Re: [multipathtcp] REMINDER: WG Last call for Multipath TCP API doc X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2012 11:01:20 -0000 --_000_9510D26531EF184D9017DF24659BB87F331C4B6739EMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, This doc has successfully passed WGLC. Thanks to everyone! Michael, Alan - please can you confirm that v04 deals with all the issues r= aised. Yoshifumi and I will start the process of pushing it into the IESG From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: 23 February 2012 14:37 To: multipathtcp@ietf.org Subject: [multipathtcp] REMINDER: WG Last call for Multipath TCP API doc Thanks for your comments so far on this. just a reminder that we're now in = the final week for the WGLC The comments so far have already been addressed in a slightly revised v-04 = on 16th Feb, http://tools.ietf.org/html/draft-ietf-mptcp-api From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: 03 February 2012 13:27 To: multipathtcp@ietf.org Subject: [multipathtcp] WG Last call for Multipath TCP API doc This is to announce the WG last call for "MPTCP Application Interface Consi= derations" http://tools.ietf.org/html/draft-ietf-mptcp-api-03 Since we are WG last calling the protocol doc as well, we will run until th= e end of Feb (Wed 29th). Please send comments to the list The purpose of a WGLC is to provide a final check that the WG has rough con= sensus to advance the document: - The WG believes that this document is technically sound - The WG believes that this document is useful - The WG believes that this document is ready to go to the IESG Please reply with positive support, as well as any comments /questions Thanks Phil & Yoshifumi -- Abstract Multipath TCP (MPTCP) adds the capability of using multiple paths to a regular TCP session. Even though it is designed to be totally backward compatible to applications, the data transport differs compared to regular TCP, and there are several additional degrees of freedom that applications may wish to exploit. This document summarizes the impact that MPTCP may have on applications, such as changes in performance. Furthermore, it discusses compatibility issues of MPTCP in combination with non-MPTCP-aware applications. Finally, the document describes a basic application interface for MPTCP-aware applications that provides access to multipath address information and a level of control equivalent to regular TCP. --_000_9510D26531EF184D9017DF24659BB87F331C4B6739EMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

This doc= has successfully passed WGLC. Thanks to everyone!

Michael, Alan – please can you conf= irm that v04 deals with all the issues raised. Yoshifumi and I will start t= he process of pushing it into the IESG

 

 

From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-= bounces@ietf.org] On Behalf Of philip.eardley@bt.com
Sent:= 23 February 2012 14:37
To: multipathtcp@ietf.org
Subject:<= /b> [multipathtcp] REMINDER: WG Last call for Multipath TCP API doc

 

= Thanks for your comments so far on this. just= a reminder that we’re now in the final week for the WGLC<= /span>

The comments so far have alr= eady been addressed in a slightly revised v-04 on 16th Feb, http://tools.ietf.o= rg/html/draft-ietf-mptcp-api

 

<= p class=3DMsoNormal>From: multipathtcp-bounces@ietf= .org [mailto:multipathtcp-bounces@ietf.org] On Behalf Of philip.eard= ley@bt.com
Sent: 03 February 2012 13:27
To: multipathtc= p@ietf.org
Subject: [multipathtcp] WG Last call for Multipath TCP= API doc

 <= /o:p>

This is to announce the WG last call for R= 20;MPTCP Application Interface Considerations= ” http= ://tools.ietf.org/html/draft-ietf-mptcp-api-03

 

Since we are WG last calling the protocol doc as well, we will run until the end of Feb (W= ed 29th).

Please send commen= ts to the list

 

The purpose of a WGLC is to provide a final check that th= e WG has rough consensus to advance the document:

- The WG believes that this document is technically sound

- The WG believes that this document is useful<= o:p>

- The WG believes that this document is = ready to go to the IESG

 

Please reply with positive support, as well as a= ny comments /questions

 =

Thanks

Phil &am= p; Yoshifumi

 

-=
- 
Abstract
 
   Multipath TCP (MPTCP) adds the capability of using mult=
iple paths to
   a regular TCP session.=
  Even though it is designed to be totally
&=
nbsp;  backward compatible to applications, the data transport differs=

   compared to regular TCP, and there =
are several additional degrees of
   fr=
eedom that applications may wish to exploit.  This document=

   summarizes the impact that MPTCP may have on a=
pplications, such as
   changes in per=
formance.  Furthermore, it discusses compatibility
   issues of MPTCP in combination with non-MPTCP-aware app=
lications.
   Finally, the document des=
cribes a basic application interface for
 &n=
bsp; MPTCP-aware applications that provides access to multipath address
   information and a level of control equi=
valent to regular TCP.
 
 
= --_000_9510D26531EF184D9017DF24659BB87F331C4B6739EMV65UKRDdoma_-- From philip.eardley@bt.com Thu Mar 1 03:07:39 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A13E521F8729 for ; Thu, 1 Mar 2012 03:07:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.38 X-Spam-Level: X-Spam-Status: No, score=-103.38 tagged_above=-999 required=5 tests=[AWL=0.218, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cSL4FGP8yi-e for ; Thu, 1 Mar 2012 03:07:37 -0800 (PST) Received: from smtpe1.intersmtp.com (smtp64.intersmtp.com [62.239.224.237]) by ietfa.amsl.com (Postfix) with ESMTP id 568EB21F8726 for ; Thu, 1 Mar 2012 03:07:37 -0800 (PST) Received: from EVMHT64-UKRD.domain1.systemhost.net (10.36.3.101) by RDW083A008ED64.smtp-e4.hygiene.service (10.187.98.13) with Microsoft SMTP Server (TLS) id 8.3.213.0; Thu, 1 Mar 2012 11:07:36 +0000 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.72]) by EVMHT64-UKRD.domain1.systemhost.net ([10.36.3.101]) with mapi; Thu, 1 Mar 2012 11:07:36 +0000 From: To: Date: Thu, 1 Mar 2012 11:07:37 +0000 Thread-Topic: REMINDER: WG Last call for Multipath TCP protocol doc Thread-Index: AczidyZSiFWm/o8+TXmYFaJdcgNenAPwPNdQAVjCXJA= Message-ID: <9510D26531EF184D9017DF24659BB87F331C4B6753@EMV65-UKRD.domain1.systemhost.net> References: <9510D26531EF184D9017DF24659BB87F3317E442F3@EMV65-UKRD.domain1.systemhost.net> <9510D26531EF184D9017DF24659BB87F331BF18813@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331BF18813@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331C4B6753EMV65UKRDdoma_" MIME-Version: 1.0 Subject: Re: [multipathtcp] REMINDER: WG Last call for Multipath TCP protocol doc X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2012 11:07:39 -0000 --_000_9510D26531EF184D9017DF24659BB87F331C4B6753EMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The WG LC is over - thanks for your comments! Christoph - you brought up a couple of points, please can you confirm you'r= e happy with the proposed resolutions (think you are - just checking) Authors - please create a new version that handles the comments raised, Yos= hifumi & I will then start pushing towards the IESG Thanks From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: 23 February 2012 14:35 To: multipathtcp@ietf.org Subject: [multipathtcp] REMINDER: WG Last call for Multipath TCP protocol d= oc Thanks for your comments so far on this. just a reminder that we're now in = the final week for the WGLC From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: 03 February 2012 13:24 To: multipathtcp@ietf.org Subject: [multipathtcp] WG Last call for Multipath TCP protocol doc This is to announce the WG last call for "TCP Extensions for Multipath Oper= ation with Multiple Addresses" http://tools.ietf.org/html/draft-ietf-mptcp= -multiaddressed-06 Since this is a reasonably substantial doc and we are WG last calling the A= PI doc as well, we will run until the end of Feb (Wed 29th). Please send comments to the list The purpose of a WGLC is to provide a final check that the WG has rough con= sensus to advance the document: - The WG believes that this document is technically sound - The WG believes that this document is useful - The WG believes that this document is ready to go to the IESG Please reply with positive support, as well as any comments /questions Thanks Phil & Yoshifumi -- Abstract TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network, and thus improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously use multiple paths between peers. This document presents a set of extensions to traditional TCP to support multipath operation. The protocol offers the same type of service to applications as TCP (i.e. reliable bytestream), and provides the components necessary to establish and use multiple TCP flows across potentially disjoint paths. --_000_9510D26531EF184D9017DF24659BB87F331C4B6753EMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

The WG LC is over – thanks for your comments!<= /p>

Christoph – you brought up a = couple of points, please can you confirm you’re happy with the propos= ed resolutions (think you are – just checking)

<= p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:= auto'>Authors – please create a new ver= sion that handles the comments raised, Yoshifumi & I will then start pu= shing towards the IESG

Thanks

 

From: multipathtcp-bounces@ietf.org [mailto:mul= tipathtcp-bounces@ietf.org] On Behalf Of philip.eardley@bt.com
Sent: 23 February 2012 14:35
To: multipathtcp@ietf.org
Subject: [multipathtcp] REMINDER: WG Last call for Multipath TCP proto= col doc

 

Thanks for your comments = so far on this. just a reminder that we’re now in the final week for = the WGLC

 

= From: multipathtcp-bounces@ietf.org [mailto:multipa= thtcp-bounces@ietf.org] On Behalf Of philip.eardley@bt.com
Sen= t: 03 February 2012 13:24
To: multipathtcp@ietf.org
Sub= ject: [multipathtcp] WG Last call for Multipath TCP protocol doc

 

This is to announce the WG last call for “TCP Extensio= ns for Multipath Operation with Multiple Addresses“  http://tools= .ietf.org/html/draft-ietf-mptcp-multiaddressed-06

 

Since this is a rea= sonably substantial doc and we are WG last calling the API doc as well, we = will run until the end of Feb (Wed 29th).

Please send comments to the list

 

The purpose of a WGLC is = to provide a final check that the WG has rough consensus to advance the doc= ument:

- The WG believes that this docum= ent is technically sound

- The WG believ= es that this document is useful

- The WG= believes that this document is ready to go to the IESG

 

Please reply wit= h positive support, as well as any comments /questions

 

Thanks<= /p>

Phil & Yoshifumi

 

-- 
Abstract=

 
   TCP/IP communication is=
 currently restricted to a single path per
  =
; connection, yet multiple paths often exist between peers.  The<=
/o:p>
   simultaneous use of these multiple paths for a=
 TCP/IP session would
   improve resource us=
age within the network, and thus improve user
 &n=
bsp; experience through higher throughput and improved resilience to
   network failure.
&nbs=
p;
   Multipath TCP provides the ability to simul=
taneously use multiple
   paths between peer=
s.  This document presents a set of extensions to
   traditional TCP to support multipath operation.  The pro= tocol offers
   the same type of service to =
applications as TCP (i.e. reliable
   bytest=
ream), and provides the components necessary to establish and
   use multiple TCP flows across potentially disjoint pat=
hs.
 
= = --_000_9510D26531EF184D9017DF24659BB87F331C4B6753EMV65UKRDdoma_-- From christoph.paasch@uclouvain.be Thu Mar 1 03:23:02 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0660821F859B for ; Thu, 1 Mar 2012 03:23:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.78 X-Spam-Level: X-Spam-Status: No, score=-5.78 tagged_above=-999 required=5 tests=[AWL=-0.669, BAYES_05=-1.11, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ICUSG5VX+PcP for ; Thu, 1 Mar 2012 03:23:01 -0800 (PST) Received: from smtp6.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id EFAF821F85A2 for ; Thu, 1 Mar 2012 03:23:00 -0800 (PST) Received: from [IPv6:2001:6a8:3080:2:6ab5:99ff:feea:c2fa] (haproxy2.sipr.ucl.ac.be [130.104.5.120]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cpaasch@smtp6.sgsi.ucl.ac.be) by smtp6.sgsi.ucl.ac.be (Postfix) with ESMTPSA id 81D411C5CCD; Thu, 1 Mar 2012 12:22:55 +0100 (CET) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp6.sgsi.ucl.ac.be 81D411C5CCD DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1330600975; bh=hYnDStFr+fOqGWeQr6+Mu0GpquJf9nMh0Ppdaw8F3Xw=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=EcI/GybubLfK9j8Oiwlh1ifode2o39h7pbtd6ERgjGZ9aac3xqF2MPngtLcEj0cIq dW2TC9UAHVWjUeXL3vKQ5Cm0f/DsUarxPjzI1c+H1wQaQqMbSTWN2mCpW+cEk5MI/n jPuGgs6v4W6KLC7Cce2CNur2jPzkrM3c/Trbd60M= Message-ID: <4F4F5C0F.3040107@uclouvain.be> Date: Thu, 01 Mar 2012 12:22:55 +0100 From: Christoph Paasch Organization: =?windows-1252?Q?Universit=E9_Catholique_de_Louvain?= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: philip.eardley@bt.com References: <9510D26531EF184D9017DF24659BB87F3317E442F3@EMV65-UKRD.domain1.systemhost.net> <9510D26531EF184D9017DF24659BB87F331BF18813@EMV65-UKRD.domain1.systemhost.net> <9510D26531EF184D9017DF24659BB87F331C4B6753@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331C4B6753@EMV65-UKRD.domain1.systemhost.net> X-TagToolbar-Keys: D20120301122255410 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.97-exp at smtp-6.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: 81D411C5CCD.A03BD X-SGSI-MailScanner: Found to be clean X-SGSI-From: christoph.paasch@uclouvain.be X-SGSI-Spam-Status: No Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] REMINDER: WG Last call for Multipath TCP protocol doc X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: christoph.paasch@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2012 11:23:02 -0000 Hi, On 03/01/2012 12:07 PM, philip.eardley@bt.com wrote: > Christoph – you brought up a couple of points, please can you confirm > you’re happy with the proposed resolutions (think you are – just checking) I am fine with the latest consensus reached on the mailing-list (keeping the retransmission of the third ack and refining some parts of the draft). Except for one point, (discussion about p.25 in the other mail-thread concerning packets without DSS-mapping). I didn't got an answer from Alan yet. In my opinion we have problems with coalescing middleboxes if we support to receive the DSS-mapping-option on a packet whose sub-seq-numbers do not belong to the specified mapping. The whole receive-buffer will be used when facing coalescing middleboxes and thus throughput drops close to zero. Christoph -- Christoph Paasch PhD Student IP Networking Lab --- http://inl.info.ucl.ac.be MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be Université Catholique de Louvain -- From Michael.Scharf@alcatel-lucent.com Thu Mar 1 03:42:44 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5ACF21F8703 for ; Thu, 1 Mar 2012 03:42:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.176 X-Spam-Level: X-Spam-Status: No, score=-6.176 tagged_above=-999 required=5 tests=[AWL=0.073, BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m4DfNc23kbWM for ; Thu, 1 Mar 2012 03:42:44 -0800 (PST) Received: from mailrelay1.alcatel.de (mailrelay1.alcatel.de [194.113.59.95]) by ietfa.amsl.com (Postfix) with ESMTP id 1480721F86D3 for ; Thu, 1 Mar 2012 03:42:43 -0800 (PST) Received: from SLFSNX.rcs.alcatel-research.de (slfsn1.rcs.de.alcatel-lucent.com [149.204.60.98]) by mailrelay1.alcatel.de (8.14.3/8.14.3/ICT) with ESMTP id q21Bgg6b002450; Thu, 1 Mar 2012 12:42:42 +0100 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: Thu, 1 Mar 2012 12:42:29 +0100 Message-ID: <133D9897FB9C5E4E9DF2779DC91E947C06E0349A@SLFSNX.rcs.alcatel-research.de> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331C4B6739@EMV65-UKRD.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [multipathtcp] REMINDER: WG Last call for Multipath TCP API doc Thread-Index: AczidyZSiFWm/o8+TXmYFaJdcgNenAAAAyjwA/BIS7ABWHNMgAABWS9w References: <9510D26531EF184D9017DF24659BB87F3317E442F8@EMV65-UKRD.domain1.systemhost.net><9510D26531EF184D9017DF24659BB87F331BF18819@EMV65-UKRD.domain1.systemhost.net> <9510D26531EF184D9017DF24659BB87F331C4B6739@EMV65-UKRD.domain1.systemhost.net> From: "SCHARF, Michael" To: X-Scanned-By: MIMEDefang 2.69 on 149.204.45.72 Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] REMINDER: WG Last call for Multipath TCP API doc X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2012 11:42:45 -0000 Hi Phil, v04 addresses all comments raised during the WGLC: - Security considerations (John) - Binding to specific addresses (John) - Path differentiation vs. security (Joe/Scott) Thus, I am not aware of anything that is missing. Michael > -----Original Message----- > From: multipathtcp-bounces@ietf.org=20 > [mailto:multipathtcp-bounces@ietf.org] On Behalf Of=20 > philip.eardley@bt.com > Sent: Thursday, March 01, 2012 12:01 PM > To: multipathtcp@ietf.org > Subject: Re: [multipathtcp] REMINDER: WG Last call for=20 > Multipath TCP API doc >=20 > Hi, >=20 > This doc has successfully passed WGLC. Thanks to everyone! >=20 > Michael, Alan - please can you confirm that v04 deals with=20 > all the issues raised. Yoshifumi and I will start the process=20 > of pushing it into the IESG >=20 > =20 >=20 > =20 >=20 > From: multipathtcp-bounces@ietf.org=20 > [mailto:multipathtcp-bounces@ietf.org] On Behalf Of=20 > philip.eardley@bt.com > Sent: 23 February 2012 14:37 > To: multipathtcp@ietf.org > Subject: [multipathtcp] REMINDER: WG Last call for Multipath=20 > TCP API doc >=20 > =20 >=20 > Thanks for your comments so far on this. just a reminder that=20 > we're now in the final week for the WGLC >=20 > The comments so far have already been addressed in a slightly=20 > revised v-04 on 16th Feb,=20 > http://tools.ietf.org/html/draft-ietf-mptcp-api=20 >=20 > =20 >=20 > From: multipathtcp-bounces@ietf.org=20 > [mailto:multipathtcp-bounces@ietf.org] On Behalf Of=20 > philip.eardley@bt.com > Sent: 03 February 2012 13:27 > To: multipathtcp@ietf.org > Subject: [multipathtcp] WG Last call for Multipath TCP API doc >=20 > =20 >=20 > This is to announce the WG last call for "MPTCP Application=20 > Interface Considerations"=20 > http://tools.ietf.org/html/draft-ietf-mptcp-api-03=20 >=20 > =20 >=20 > Since we are WG last calling the protocol doc as well, we=20 > will run until the end of Feb (Wed 29th).=20 >=20 > Please send comments to the list=20 >=20 > =20 >=20 > The purpose of a WGLC is to provide a final check that the WG=20 > has rough consensus to advance the document: >=20 > - The WG believes that this document is technically sound >=20 > - The WG believes that this document is useful >=20 > - The WG believes that this document is ready to go to the IESG=20 >=20 > =20 >=20 > Please reply with positive support, as well as any comments /questions >=20 > =20 >=20 > Thanks >=20 > Phil & Yoshifumi >=20 > =20 >=20 > -- > Abstract > =20 >=20 > Multipath TCP (MPTCP) adds the capability of using=20 > multiple paths to >=20 > a regular TCP session. Even though it is designed to be totally >=20 > backward compatible to applications, the data transport differs >=20 > compared to regular TCP, and there are several additional=20 > degrees of >=20 > freedom that applications may wish to exploit. This document >=20 > summarizes the impact that MPTCP may have on applications, such as >=20 > changes in performance. Furthermore, it discusses compatibility >=20 > issues of MPTCP in combination with non-MPTCP-aware applications. >=20 > Finally, the document describes a basic application interface for >=20 > MPTCP-aware applications that provides access to multipath address >=20 > information and a level of control equivalent to regular TCP. >=20 > =20 >=20 > =20 >=20 From nishida@sfc.wide.ad.jp Thu Mar 1 11:50:50 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 30DBE21E8043 for ; Thu, 1 Mar 2012 11:50:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -98.624 X-Spam-Level: X-Spam-Status: No, score=-98.624 tagged_above=-999 required=5 tests=[AWL=-0.150, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HELO_EQ_JP=1.244, HOST_EQ_JP=1.265, RELAY_IS_203=0.994, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jRuu8bHI3ImF for ; Thu, 1 Mar 2012 11:50:44 -0800 (PST) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [203.178.142.130]) by ietfa.amsl.com (Postfix) with ESMTP id 710A621E800F for ; Thu, 1 Mar 2012 11:50:44 -0800 (PST) Received: from mail-bk0-f44.google.com (mail-bk0-f44.google.com [209.85.214.44]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 8C92F2780ED for ; Fri, 2 Mar 2012 04:50:40 +0900 (JST) Received: by bkuw5 with SMTP id w5so1032624bku.31 for ; Thu, 01 Mar 2012 11:50:37 -0800 (PST) Received-SPF: pass (google.com: domain of nishida@sfc.wide.ad.jp designates 10.112.25.40 as permitted sender) client-ip=10.112.25.40; Authentication-Results: mr.google.com; spf=pass (google.com: domain of nishida@sfc.wide.ad.jp designates 10.112.25.40 as permitted sender) smtp.mail=nishida@sfc.wide.ad.jp Received: from mr.google.com ([10.112.25.40]) by 10.112.25.40 with SMTP id z8mr3018268lbf.11.1330631437745 (num_hops = 1); Thu, 01 Mar 2012 11:50:37 -0800 (PST) MIME-Version: 1.0 Received: by 10.112.25.40 with SMTP id z8mr2447576lbf.11.1330631437725; Thu, 01 Mar 2012 11:50:37 -0800 (PST) Received: by 10.112.94.43 with HTTP; Thu, 1 Mar 2012 11:50:37 -0800 (PST) In-Reply-To: <4F47A084.5000009@uclouvain.be> References: <4F47A084.5000009@uclouvain.be> Date: Thu, 1 Mar 2012 11:50:37 -0800 Message-ID: From: Yoshifumi Nishida To: christoph.paasch@uclouvain.be Content-Type: text/plain; charset=ISO-8859-1 Cc: MultiPath TCP - IETF WG Subject: Re: [multipathtcp] I-D Action: draft-ietf-mptcp-multiaddressed-06.txt X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2012 19:50:50 -0000 Hello, 2012/2/24 Christoph Paasch : > Hello Alan, all, > > > On 02/23/2012 01:30 PM, Alan Ford wrote: >>>>> ============ >>>>> * Retransmission of the third ACK, to ensure reliable delivery of the >>>>> keys in MP_CAPABLE (page 14): >>>>> >>>>> The retransmission of the third ack was introduced to allow lost third >>>>> acks, if the server is operating stateless. However, this introduced an >>>>> additional RTT before the client is able to send data and thus, we now >>>>> allow the client to send data before he receives the acknowledgment of >>>>> his third ack (in PRE_ESTABLISHED state). >>>>> >>>>> I now realize, that the retransmission does not buy us a lot: >>>>> >>>>> E.g., if the third ACK gets lost, but the client already starts to send >>>>> data and this data reaches the stateless server. >>>>> The server then can only send a subflow-ack without DATA_ACK and thus >>>>> behave as in regular TCP. >>>>> The client then should interpret this subflow-ack not as the one >>>>> acknowledging the third ack (the one with the MP_CAPABLE), but rather >>>>> fallback to regular TCP. Because, otherwise the client and server are no >>>>> more in-sync. >>>>> >>>>> Thus, the retransmission only buys us something if the server is >>>>> behaving stateless, the third ack got lost and the server is the one >>>>> trying to send data first. This same problem is already present for >>>>> stateless servers operating with regular TCP. >>>>> >>>>> I'm not sure that this current behavior of sending data in >>>>> PRE_ESTABLISHED state is safe (e.g., how to behave if the third ack and >>>>> the first data-packet got lost, but the second data-packet reaches the >>>>> server? - the server sends a duplicate subflow-ack without >>>>> MPTCP-options. How will the client interpret this subflow-ack?). >>>>> >>>>> I think we should remove the retransmission of the third ack, as it does >>>>> not buy us a lot, and keep with the simpler and more straight-forward >>>>> mechanism of not caring about lost third-acks (as in draft v02). >>>> >>>> It is true that if we removed the retransmission of the third ACK was added >>>> for this corner case. But this is a well-known flaw in stateless operation >>>> and SYN cookies, and our motivation for doing this was to make MPTCP's >>>> handling of this better than regular TCP today. >>>> >>>> I agree, however, that it would make things simpler, and faster in the >>>> majority of circumstances, to revert to a simple three-way handshake. >>>> >>>> Does anybody else have any thoughts? >>> >>> I realize one more thing, "conflicting" with the fact that no new >>> subflows may be established while in PRE_ESTABLISHED, as described in >>> section 3.1. Because, in section 3.6, we say that no new subflows are >>> allowed as long as we did not receive a DATA_ACK. And, we will always >>> enter PRE_ESTABLISHED before (or at the same time) receiving the first >>> DATA_ACK. >>> >>> Thus, section 3.1 does not need to specify this, or may >>> forward-reference to section 3.6. >> >> Thanks, we'll change that - that simplifies things. > > Good. > > So, retransmission of the third ack will stay? > > I just wanted to favor simplicity to make the protocol less complex. The > more complex MPTCP is, the harder it will be to get it deployed. > > If the argument, that we want to fix with MPTCP the "broken" TCP > SYN-cookies with regular TCP, is strong enough to justify the additional > complexity, I'm fine with it. I'm wondering if we need to specify this behavior in the protocol spec. it might be an implementor's choice. An implementor might prefer simple way. if it doesn't implement retransmission of the third ack, it should fallback to normal TCP when the third ack is lost. But, this is only sender's behavior and doesn't break the communication. -- Yoshifumi From christoph.paasch@uclouvain.be Sun Mar 4 11:44:49 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F10A21F851E for ; Sun, 4 Mar 2012 11:44:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.39 X-Spam-Level: X-Spam-Status: No, score=-6.39 tagged_above=-999 required=5 tests=[AWL=0.209, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id d1HV-K8uSFJ3 for ; Sun, 4 Mar 2012 11:44:48 -0800 (PST) Received: from smtp5.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id 0A61C21F8516 for ; Sun, 4 Mar 2012 11:44:47 -0800 (PST) Received: from [130.104.121.157] (wifi-secure1-413.sri.ucl.ac.be [130.104.121.157]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cpaasch@smtp5.sgsi.ucl.ac.be) by smtp5.sgsi.ucl.ac.be (Postfix) with ESMTPSA id 60F7411E90D; Sun, 4 Mar 2012 20:44:42 +0100 (CET) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp5.sgsi.ucl.ac.be 60F7411E90D DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1330890282; bh=qJdiyxhv+4xktM+HdgmXRFNPHJ8UbFg/77HEX09EmHU=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=H1s0JEwcSec7X2n1UquiNamHSSGl9/gm+xttgdTQ9qndeWBQKzzvw5Oa9zOLAQmqY DfTWOuZKFRibgM3bpSKA/tfJdVxsmKyvZKTc54B1UeefRBgnmzg7oc6hzow/9byojw gvLip6jhhMt1vCQlSy2kXzOw5nQeC1+ELuTPlOfs= Message-ID: <4F53C62A.70205@uclouvain.be> Date: Sun, 04 Mar 2012 20:44:42 +0100 From: Christoph Paasch Organization: =?ISO-8859-1?Q?Universit=E9_Catholique_de_Louvain?= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: Yoshifumi Nishida References: <4F47A084.5000009@uclouvain.be> In-Reply-To: X-TagToolbar-Keys: D20120304204442198 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.97.3-exp at smtp-5.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: 60F7411E90D.AEB9F X-SGSI-MailScanner: Found to be clean X-SGSI-From: christoph.paasch@uclouvain.be X-SGSI-Spam-Status: No Cc: MultiPath TCP - IETF WG Subject: Re: [multipathtcp] I-D Action: draft-ietf-mptcp-multiaddressed-06.txt X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: christoph.paasch@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Mar 2012 19:44:49 -0000 On 03/01/2012 08:50 PM, Yoshifumi Nishida wrote: >> On 02/23/2012 01:30 PM, Alan Ford wrote: >>>>>> ============ >>>>>> * Retransmission of the third ACK, to ensure reliable delivery of the >>>>>> keys in MP_CAPABLE (page 14): >>>>>> >>>>>> The retransmission of the third ack was introduced to allow lost third >>>>>> acks, if the server is operating stateless. However, this introduced an >>>>>> additional RTT before the client is able to send data and thus, we now >>>>>> allow the client to send data before he receives the acknowledgment of >>>>>> his third ack (in PRE_ESTABLISHED state). >>>>>> >>>>>> I now realize, that the retransmission does not buy us a lot: >>>>>> >>>>>> E.g., if the third ACK gets lost, but the client already starts to send >>>>>> data and this data reaches the stateless server. >>>>>> The server then can only send a subflow-ack without DATA_ACK and thus >>>>>> behave as in regular TCP. >>>>>> The client then should interpret this subflow-ack not as the one >>>>>> acknowledging the third ack (the one with the MP_CAPABLE), but rather >>>>>> fallback to regular TCP. Because, otherwise the client and server are no >>>>>> more in-sync. >>>>>> >>>>>> Thus, the retransmission only buys us something if the server is >>>>>> behaving stateless, the third ack got lost and the server is the one >>>>>> trying to send data first. This same problem is already present for >>>>>> stateless servers operating with regular TCP. >>>>>> >>>>>> I'm not sure that this current behavior of sending data in >>>>>> PRE_ESTABLISHED state is safe (e.g., how to behave if the third ack and >>>>>> the first data-packet got lost, but the second data-packet reaches the >>>>>> server? - the server sends a duplicate subflow-ack without >>>>>> MPTCP-options. How will the client interpret this subflow-ack?). >>>>>> >>>>>> I think we should remove the retransmission of the third ack, as it does >>>>>> not buy us a lot, and keep with the simpler and more straight-forward >>>>>> mechanism of not caring about lost third-acks (as in draft v02). >>>>> >>>>> It is true that if we removed the retransmission of the third ACK was added >>>>> for this corner case. But this is a well-known flaw in stateless operation >>>>> and SYN cookies, and our motivation for doing this was to make MPTCP's >>>>> handling of this better than regular TCP today. >>>>> >>>>> I agree, however, that it would make things simpler, and faster in the >>>>> majority of circumstances, to revert to a simple three-way handshake. >>>>> >>>>> Does anybody else have any thoughts? >>>> >>>> I realize one more thing, "conflicting" with the fact that no new >>>> subflows may be established while in PRE_ESTABLISHED, as described in >>>> section 3.1. Because, in section 3.6, we say that no new subflows are >>>> allowed as long as we did not receive a DATA_ACK. And, we will always >>>> enter PRE_ESTABLISHED before (or at the same time) receiving the first >>>> DATA_ACK. >>>> >>>> Thus, section 3.1 does not need to specify this, or may >>>> forward-reference to section 3.6. >>> >>> Thanks, we'll change that - that simplifies things. >> >> Good. >> >> So, retransmission of the third ack will stay? >> >> I just wanted to favor simplicity to make the protocol less complex. The >> more complex MPTCP is, the harder it will be to get it deployed. >> >> If the argument, that we want to fix with MPTCP the "broken" TCP >> SYN-cookies with regular TCP, is strong enough to justify the additional >> complexity, I'm fine with it. > > I'm wondering if we need to specify this behavior in the protocol spec. > it might be an implementor's choice. An implementor might prefer > simple way. if it doesn't implement retransmission of the third ack, > it should fallback to normal TCP when the third ack is lost. But, this > is only sender's behavior and doesn't break the communication. Yes, I think that's the best option. Christoph -- Christoph Paasch PhD Student IP Networking Lab --- http://inl.info.ucl.ac.be MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be Université Catholique de Louvain -- From georg.hampel@alcatel-lucent.com Fri Mar 9 06:23:23 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B1D2F21F8686 for ; Fri, 9 Mar 2012 06:23:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.449 X-Spam-Level: X-Spam-Status: No, score=-7.449 tagged_above=-999 required=5 tests=[AWL=-0.850, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Nd7yWMkRAUfo for ; Fri, 9 Mar 2012 06:23:23 -0800 (PST) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id 1D2F721F8684 for ; Fri, 9 Mar 2012 06:23:23 -0800 (PST) Received: from usnavsmail4.ndc.alcatel-lucent.com (usnavsmail4.ndc.alcatel-lucent.com [135.3.39.12]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id q29ENLE8018185 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 9 Mar 2012 08:23:21 -0600 (CST) Received: from USNAVSXCHHUB01.ndc.alcatel-lucent.com (usnavsxchhub01.ndc.alcatel-lucent.com [135.3.39.110]) by usnavsmail4.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q29ENLgV015332 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Fri, 9 Mar 2012 08:23:21 -0600 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB01.ndc.alcatel-lucent.com ([135.3.39.110]) with mapi; Fri, 9 Mar 2012 08:23:21 -0600 From: "Hampel, K Georg (K Georg)" To: "ayar@mail.tu-berlin.de" , "multipathtcp@ietf.org" Date: Fri, 9 Mar 2012 08:23:20 -0600 Thread-Topic: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 Thread-Index: Aczv2X8onnQr8DHrTMuzqoIMGPv+hgOJfIUg Message-ID: <154773479ED2314980CB638A48FC44348915043D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> In-Reply-To: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> 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 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.37 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.12 Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Mar 2012 14:23:23 -0000 Hi Tacettin et al, I read your draft. I have the following questions & comments: 1) What specific use case(s) do you have in mind? 2) In my opinion, SCAPs logically operate on L4 since they mess around in c= onnection-specific flow properties based on SEQ numbers. You may implement = it on a lower layer but that's a different issue. 3) Why don't you simply use MPTCP?=20 Thanks. Georg -----Original Message----- From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of ayar@mail.tu-berlin.de Sent: Monday, February 20, 2012 9:01 AM To: multipathtcp@ietf.org Subject: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 Hi all, We have posted a new draft with the title: "A Transparent Performance =20 Enhancing Proxy Architecture To Enable TCP over Multiple Paths for =20 Single-Homed Hosts" =20 (http://tools.ietf.org/html/draft-ayar-transparent-sca-proxy-00). In this draft, we define a TCP Splitter/Combiner Architecture (SCA) =20 that enables non-MPTCP-capable single-homed hosts to benefit from the =20 multiple paths within Internet by means of transparent performance =20 enhancing proxies (PEPs). Since existence of the SCA is shielded from =20 the TCP end-points, it can also be deployed on the TCP end-hosts. We invite everybody to read the draft and look forward to your comments. Thanks, Tacettin _______________________________________________ multipathtcp mailing list multipathtcp@ietf.org https://www.ietf.org/mailman/listinfo/multipathtcp From nishida@sfc.wide.ad.jp Sun Mar 11 01:54:55 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B7B621F8644 for ; Sun, 11 Mar 2012 01:54:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -98.549 X-Spam-Level: X-Spam-Status: No, score=-98.549 tagged_above=-999 required=5 tests=[AWL=-0.075, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HELO_EQ_JP=1.244, HOST_EQ_JP=1.265, RELAY_IS_203=0.994, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CLLiyQF6eJzZ for ; Sun, 11 Mar 2012 01:54:54 -0800 (PST) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [203.178.142.130]) by ietfa.amsl.com (Postfix) with ESMTP id 5621C21F8642 for ; Sun, 11 Mar 2012 01:54:54 -0800 (PST) Received: from mail-lb0-f172.google.com (mail-lb0-f172.google.com [209.85.217.172]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 3AB2527809F for ; Sun, 11 Mar 2012 18:54:48 +0900 (JST) Received: by lbol12 with SMTP id l12so802440lbo.31 for ; Sun, 11 Mar 2012 01:54:46 -0800 (PST) MIME-Version: 1.0 Received: by 10.112.36.65 with SMTP id o1mr3163212lbj.32.1331459686814; Sun, 11 Mar 2012 01:54:46 -0800 (PST) Received: by 10.112.63.174 with HTTP; Sun, 11 Mar 2012 01:54:46 -0800 (PST) In-Reply-To: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> Date: Sun, 11 Mar 2012 01:54:46 -0800 Message-ID: From: Yoshifumi Nishida To: ayar@mailbox.tu-berlin.de Content-Type: text/plain; charset=ISO-8859-1 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 11 Mar 2012 09:54:55 -0000 Hi Ayar, Sorry for the delay. I've finally found that time to read your draft. The following points are not very clear to me. It would be great if you could clarify. 1: It's not very clear to me what is the advantage of this protocol. I think this approach presumes to utilize multiple paths between routers. hence, it looks to me we might be able to do the similar things by using some kinds of multipath routing between these routers. Or, if we run mptcp between two proxies, we might also be able to do similar thing. could you elaborate the feature of this approach compared to other approach? 2: I think we'll need to know what kinds of signaling are used between SCA proxies. For example, how a SCA can find other SCAs? 3: It's not clear to me how it is useful when there's only one SCA or there are more than 2 SCAs on the path. Could you describe some scenarios for them? Thanks, -- Yoshifumi Nishida On Mon, Feb 20, 2012 at 6:01 AM, wrote: > Hi all, > > We have posted a new draft with the title: "A Transparent Performance > Enhancing Proxy Architecture To Enable TCP over Multiple Paths for > Single-Homed Hosts" > (http://tools.ietf.org/html/draft-ayar-transparent-sca-proxy-00). > > In this draft, we define a TCP Splitter/Combiner Architecture (SCA) that > enables non-MPTCP-capable single-homed hosts to benefit from the multiple > paths within Internet by means of transparent performance enhancing proxies > (PEPs). Since existence of the SCA is shielded from the TCP end-points, it > can also be deployed on the TCP end-hosts. > > > We invite everybody to read the draft and look forward to your comments. > > > Thanks, > > Tacettin > > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp From alanford@cisco.com Tue Mar 13 01:42:59 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0DEB621F86DD for ; Tue, 13 Mar 2012 01:42:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.749 X-Spam-Level: X-Spam-Status: No, score=-9.749 tagged_above=-999 required=5 tests=[AWL=0.850, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JDCMDekFWkzL for ; Tue, 13 Mar 2012 01:42:58 -0700 (PDT) Received: from ams-iport-1.cisco.com (ams-iport-1.cisco.com [144.254.224.140]) by ietfa.amsl.com (Postfix) with ESMTP id 067A721F86DB for ; Tue, 13 Mar 2012 01:42:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=alanford@cisco.com; l=217170; q=dns/txt; s=iport; t=1331628175; x=1332837775; h=date:subject:from:to:message-id:mime-version; bh=hF+ym6GO9gH/cqykqT6EY2KAKSPKgMYOJm/O1yhnlas=; b=aKJYv3CAx+xZcQPlfcigi6lnnxXX44+K6ucZe/guLghI71k3VLg2iqCL EnBtu1mLGdYYYTuQ++OQgPOM1JrlccRuai2QsjCOGJz0tqjIqp3Qki+Qz Ip/ktsdxH9+nKSBg8PLdq1B4IgAxVWvSQRrm7RciR1QP45cn2Y0uDHUVo E=; X-Files: draft-ietf-mptcp-multiaddressed-07.txt : 157813 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Av4EALQHX0+Q/khN/2dsb2JhbABBtR5LgQeCCwEEEgEqTgFQVgEENYdonmiBJwGXI4oxhjQEjl6GcZAjgmWBXA X-IronPort-AV: E=Sophos;i="4.73,576,1325462400"; d="txt'?scan'208";a="132133055" Received: from ams-core-4.cisco.com ([144.254.72.77]) by ams-iport-1.cisco.com with ESMTP; 13 Mar 2012 08:42:53 +0000 Received: from xbh-ams-101.cisco.com (xbh-ams-101.cisco.com [144.254.74.71]) by ams-core-4.cisco.com (8.14.3/8.14.3) with ESMTP id q2D8gri0014855 for ; Tue, 13 Mar 2012 08:42:53 GMT Received: from xmb-ams-203.cisco.com ([144.254.75.14]) by xbh-ams-101.cisco.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 13 Mar 2012 09:42:53 +0100 Received: from 10.61.80.201 ([10.61.80.201]) by XMB-AMS-203.cisco.com ([144.254.75.14]) with Microsoft Exchange Server HTTP-DAV ; Tue, 13 Mar 2012 08:42:51 +0000 User-Agent: Microsoft-Entourage/12.32.0.111121 Date: Tue, 13 Mar 2012 08:42:49 +0000 From: Alan Ford To: MultiPath TCP - IETF WG Message-ID: Thread-Topic: New version of MPTCP Draft Thread-Index: Ac0A9UUb6nMQUKH44EyWIcX480+7bA== Mime-version: 1.0 Content-type: multipart/mixed; boundary="B_3414472971_14721636" X-OriginalArrivalTime: 13 Mar 2012 08:42:53.0832 (UTC) FILETIME=[47FC5880:01CD00F5] Subject: [multipathtcp] New version of MPTCP Draft X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2012 08:42:59 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3414472971_14721636 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Hi all, I was intending to submit a new version of the MPTCP protocol draft last night, but had some Internet connection problems and ended up missing the cut-off. The edits were entirely in response to Christoph's WGLC comments. For the record, this updated version is attached to this mail, and will be submitted once the I-D submissions are re-opened. 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--B_3414472971_14721636-- From philip.eardley@bt.com Thu Mar 15 02:24:26 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8EB3821F8613 for ; Thu, 15 Mar 2012 02:24:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.414 X-Spam-Level: X-Spam-Status: No, score=-103.414 tagged_above=-999 required=5 tests=[AWL=0.184, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E1pGCTWMR1YL for ; Thu, 15 Mar 2012 02:24:25 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp63.intersmtp.com [62.239.224.236]) by ietfa.amsl.com (Postfix) with ESMTP id 7399021F85EE for ; Thu, 15 Mar 2012 02:24:25 -0700 (PDT) Received: from EVMHT69-UKRD.domain1.systemhost.net (10.36.3.129) by RDW083A007ED63.smtp-e3.hygiene.service (10.187.98.12) with Microsoft SMTP Server (TLS) id 8.3.213.0; Thu, 15 Mar 2012 09:24:24 +0000 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.2.164]) by EVMHT69-UKRD.domain1.systemhost.net ([10.36.3.129]) with mapi; Thu, 15 Mar 2012 09:24:24 +0000 From: To: Date: Thu, 15 Mar 2012 09:24:23 +0000 Thread-Topic: Draft MPTCP meeting agenda Thread-Index: Ac0CjWjqDw4B8sDXTb6Un/B/4xYAGQ== Message-ID: <9510D26531EF184D9017DF24659BB87F331D3158F8@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331D3158F8EMV65UKRDdoma_" MIME-Version: 1.0 Subject: [multipathtcp] Draft MPTCP meeting agenda X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2012 09:24:26 -0000 --_000_9510D26531EF184D9017DF24659BB87F331D3158F8EMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Draft agenda uploaded http://www.ietf.org/proceedings/83/agenda/agenda-83-mptcp.txt suggested changes /requests welcome see you in Paris! --_000_9510D26531EF184D9017DF24659BB87F331D3158F8EMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Draft agenda uploaded

http://www.ietf.org/proceedings/83/agenda/agenda-83-mptcp.txt

suggested changes /requests welcome

 

s= ee you in Paris!

= --_000_9510D26531EF184D9017DF24659BB87F331D3158F8EMV65UKRDdoma_-- From ayar@tkn.tu-berlin.de Thu Mar 15 08:03:21 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6D6B721F8747 for ; Thu, 15 Mar 2012 08:03:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.249 X-Spam-Level: X-Spam-Status: No, score=-5.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, GB_AFFORDABLE=1, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kYuZdJkAQevy for ; Thu, 15 Mar 2012 08:03:20 -0700 (PDT) Received: from mail.tu-berlin.de (mail.tu-berlin.de [130.149.7.33]) by ietfa.amsl.com (Postfix) with ESMTP id A734121F8743 for ; Thu, 15 Mar 2012 08:03:20 -0700 (PDT) X-tubIT-Incoming-IP: 130.149.7.200 Received: from www.redaktion.tu-berlin.de ([130.149.7.200] helo=mailbox.tu-berlin.de) by mail.tu-berlin.de (exim-4.75/mailfrontend-2) with esmtp id 1S8CD1-0003Ee-IT; Thu, 15 Mar 2012 16:03:19 +0100 Received: from 141.23.89.155 ([141.23.89.155]) by webmail.tu-berlin.de (Horde Framework) with HTTP; Thu, 15 Mar 2012 16:03:14 +0100 Message-ID: <20120315160314.10773yj9iszx8tki@webmail.tu-berlin.de> Date: Thu, 15 Mar 2012 16:03:14 +0100 From: Tacettin Ayar To: "Hampel, K Georg (K Georg)" References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> <154773479ED2314980CB638A48FC44348915043D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: <154773479ED2314980CB638A48FC44348915043D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Internet Messaging Program (IMP) H3 (4.3.9) Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2012 15:03:21 -0000 Dear Georg, please find the answers to your questions inline. Best Regards, Tacettin > 1) What specific use case(s) do you have in mind? We have the following use cases in mind: 1)Bandwidth Aggregation: As mentioned in Section 1.3, SCAPs may be used in access networks (e.g., wireless mesh network backbone, WLAN or femtocells) that are connected to the Internet via bottleneck gateway links (e.g., DSL lines or T1), see figure 1. In that use case, SCAPs will aggregate the capacities of the GW links. 2)Load Balancing: As mentioned in Section 4.2, SCAPs may be used to distribute traffic via multiple paths within an access network (Figure 4) for load balancing. 3)Redundancy: The same TCP segment may be sent via multiple paths to create redundancy in networks with high-error rates. For example, Pipe-1 and Pipe-2 in Figure 4 may be used to send the same segment if access network has high packet loss rates. 4)Avoiding bottlenecks: Since SCAPs are aware of TCP flows in the network they may redirect TCP traffic to other available paths to avoid bottlenecks. > > 2) In my opinion, SCAPs logically operate on L4 since they mess > around in connection-specific flow properties based on SEQ numbers. > You may implement it on a lower layer but that's a different issue. Indeed, SCAPs operate on L3.5: not touching/replacing IP and TCP, and getting their input as TCP segments. > > 3) Why don't you simply use MPTCP? Since MPTCP is designed to be used on multi-homed end-systems! Scalability problems might occur when MPTCP is used on proxies. For example, Section 5.3 of RFC 6182 mentions a case in which 12.5 MB receive buffer space is needed. On end-hosts, it may be affordable. But, on network devices with lots of TCP flows, processing and space overhead MUST NOT be ignored. From ayar@tkn.tu-berlin.de Thu Mar 15 09:54:14 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2AA421F86E8 for ; Thu, 15 Mar 2012 09:54:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.749 X-Spam-Level: X-Spam-Status: No, score=-4.749 tagged_above=-999 required=5 tests=[AWL=-0.500, BAYES_00=-2.599, HELO_EQ_DE=0.35, J_BACKHAIR_55=1, J_BACKHAIR_56=1, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0E4w2KVyNAuO for ; Thu, 15 Mar 2012 09:54:13 -0700 (PDT) Received: from mail.tu-berlin.de (mail.tu-berlin.de [130.149.7.33]) by ietfa.amsl.com (Postfix) with ESMTP id 8E9C621F86C1 for ; Thu, 15 Mar 2012 09:54:10 -0700 (PDT) X-tubIT-Incoming-IP: 130.149.7.200 Received: from www.redaktion.tu-berlin.de ([130.149.7.200] helo=mailbox.tu-berlin.de) by mail.tu-berlin.de (exim-4.75/mailfrontend-3) with esmtp id 1S8DwH-0007FO-EN; Thu, 15 Mar 2012 17:54:09 +0100 Received: from 141.23.89.155 ([141.23.89.155]) by webmail.tu-berlin.de (Horde Framework) with HTTP; Thu, 15 Mar 2012 17:54:04 +0100 Message-ID: <20120315175404.80191jrtu2drnp9o@webmail.tu-berlin.de> Date: Thu, 15 Mar 2012 17:54:04 +0100 From: Tacettin Ayar To: Yoshifumi Nishida References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Internet Messaging Program (IMP) H3 (4.3.9) Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2012 16:54:15 -0000 Dear Yoshifumi, please find our answers to your comments inline. Best Regards, Tacettin et al Quoting Yoshifumi Nishida : > Hi Ayar, > > Sorry for the delay. I've finally found that time to read your draft. > The following points are not very clear to me. It would be great if > you could clarify. > > 1: It's not very clear to me what is the advantage of this protocol. > I think this approach presumes to utilize multiple paths between routers. > hence, it looks to me we might be able to do the similar things by > using some kinds of multipath routing between these routers. > Or, if we run mptcp between two proxies, we might also be able to > do similar thing. > could you elaborate the feature of this approach compared to > other approach? Multi-path routing can not fit all the needs of TCP over multiple paths since performance of TCP flows is affected by the use of multiple-paths (e.g., because of out-of-order packets). Thus, TCP flows must be identified and side-effects of multi-path routing must be cleared. Use of MPTCP between the proxies is not a good idea either, as MPTCP is designed for TCP end-hosts. When used on proxies (with lots of TCP flows) it will introduce too much overhead. > > 2: I think we'll need to know what kinds of signaling are used between > SCA proxies. > For example, how a SCA can find other SCAs? > SCAPs may use signaling for many purposes. For example, to probe for other SCAPs, to inform the SCAP peer about other IP addresses of the SCAP device, to send a series of packets to probe for pipe characteristics (e.g., delay, capacity, loss rate), etc. There are also many available options for signaling between SCAPs. For example, to find another SCAP a SCAP may: (1) flood SCAP peer probe packets, (2) select some links for sending the SCAP probe packets (e.g., using a multipath routing protocol), or (3) send the probe packet only via the default TCP path, to name a few. However, we haven't yet analyzed all these options in detail and they may be subject to an extension of our draft. We believe that it is important to agree on the architecture and get a broader support for it, before going to the details of the signaling, which we obviously are willing to deliver. Addressing your question, what we mentioned in our draft (Section 3.5) is that signaling may be in-band, out-of-band, or hybrid. As an example, in-band signaling may be used to probe for other SCAPs as follows: a SCAP that receives a TCP connection request packet (packet with SYN) adds a TCP option (e.g., SCAP-PROBE) to the packet to signal its existence and address. Assume that the packet is sent via only default TCP path. The packet will then follow the default TCP path with SCAP-PROBE option. If there is another SCAP on the path, it will recognize the SCAP-PROBE TCP option and obtain the address of the peer SCAP that generated it in order to establish the contact. If there is no SCAP on the path, then TCP receiver will ignore the unrecognized option. The mentioned method is similar to the MPTCP, which uses MP_CAPABLE option to look whether the peer supports MPTCP or not. Of course, vulnerabilities exist (e.g., middleboxes that drop packets with unknown TCP options or remove the unknown options from the packets), same as for MPTCP. > 3: It's not clear to me how it is useful when there's only one SCA or > there are more than 2 SCAs on the path. Could you describe some > scenarios for them? > If there is only one SCAP between TCP sender and receiver, then we may: (1) not use SCAP and rely on default single-path TCP or (2) use SCAP to distribute TCP traffic over multiple paths. In the latter case we have to consider the side-effects of the distribution (combining is done at the receiver) . For example, Simula Proxy [1] uses path delay estimations to calculate packet arrival times and buffer the potentially out-of-order packets on the shorter paths, compensating the different path delays. DUPACK estimation and filtering (DEF) [2] uses path delays to estimate number of duplicate acknowledgements caused by different path delays and shields them from the TCP sender. [1] K. Evensen, D. Kaspar, P. Engelstad, A. F. Hansen, C. Griwodz, and P. Halvorsen, "A Network-Layer Proxy for Bandwidth Aggregation and Reduction of IP Packet Reordering," IEEE 34th Conference on Local Computer Networks (LCN 2009), pp. 585?592, October 2009. [2] T. Ayar, B. Rathke, L. Budzisz, and A. Wolisz, "TCP over Multiple Paths Revisited: Towards Transparent Proxy Solutions," Accepted by The IEEE International Conference on Communications 2012 (IEEE ICC'12), June 2012. Use of two or more SCAPs is open to discussion. We present two scenarios in which use of more than two SCAPs is beneficial. ----------- SCENARIO 1: ----------- Consider the following figure. There are two pipes between SCAP-1 and SCAP-2: (Pipe1 passes through Path2 and Path4 and Pipe2 passes through Path3 and Path5). In this case capacity of Pipe1 is limited by the capacity of Path4 (i.e., 1) and capacity of Pipe2 is limited by the capacity of Path3 (i.e., 1). The aggregate capacity that may be used by the connection is then 2. +----+ +----+ +----+ +----+ +----+ | | | |-------| |-------| | | | | | | |Path2=4| |Path4=1| | | | | |-------| |-------| |-------| |-------| | |TCP |Path1=5|SCAP| |ROU | |SCAP|Path6=5| TCP| |Host|-------| 1 |-------|TER |-------| 2 |-------|Host| | | | |Path3=1| |Path5=4| | | | | | | |-------| |-------| | | | +----+ +----+ +----+ +----+ +----+ Now, assume that router is used as a SCAP device, as shown in the next figure. In that case, SCAP-1 and SCAP-3 use two pipes: Pipe1=Path2 and Pipe2=Path3. Since SCAP-3 combines packets from these two pipes, There is aggregated capacity of 5 between SCAP-1 and SCAP-3. Similarly, The aggregated capacity between SCAP-3 and SCAP-2 is also 5. Thus, connection may use a capacity of 5. +----+ +----+ +----+ +----+ +----+ | | | |-------| |-------| | | | | | | |Path2=4| |Path4=1| | | | | |-------| |-------| |-------| |-------| | |TCP |Path1=5|SCAP| |SCAP| |SCAP|Path6=5| TCP| |Host|-------| 1 |-------| 3 |-------| 2 |-------|Host| | | | |Path3=1| |Path5=4| | | | | | | |-------| |-------| | | | +----+ +----+ +----+ +----+ +----+ ----------- SCENARIO 2: ----------- Now consider the following figure. SCAP-1 and SCAP-2 both have two interfaces and may use the upper interface pair as a pipe (Pipe1 which passes through Path2<->Path4<->Path6 or Path2<->Path9<->Path6) and lower interface pair as a pipe (Pipe2 which passes through Path3<->Path5<->Path7 or Path3<->Path10<->Path7). In this case capacity of Pipe1 is limited by the capacity of Path4 or Path9 (i.e., 1) and capacity of Pipe2 is limited by the capacity of Path5 or Path10 (i.e., 1), whichever path is used between the routers. The capacity that may be used by the connection is 2. +---------------------+ | Path9=1 | | +-------------+ | | | | | +------+ +------+ +-------+ +-------+ +------+ +------+ | | | |---------| |---------| |---------| | | | | | | | Path2=2 | | Path4=1 | | Path6=2 | | | | | |---------| |---------| |---------| |---------| |---------| | | TCP | Path1=4 | SCAP | |ROUTER | |ROUTER | | SCAP | Path8=4 | TCP | | Host |---------| 1 |---------| |---------| |---------| 2 |---------| Host | | | | | Path3=2 | | Path5=1 | | Path7=2 | | | | | | | |---------| |---------| |---------| | | | +------+ +------+ +-------+ +-------+ +------+ +------+ | | | | | +-------------+ | | Path10=1 | +---------------------+ Now, assume that routers are used as SCAP devices, as shown in the following figure. In that case, SCAP-1 and SCAP-3 use two pipes: Pipe1=Path2 and Pipe2=Path3. Since SCAP-3 combines packets from these two pipes, There is aggregated capacity of 4 between SCAP-1 and SCAP-3. Similarly, SCAP-3 and SCAP-4 use four pipes: Pipe1=Path9, Pipe2=Path4, Pipe3=Path5 and Pipe4=Path10. The aggregated capacity between SCAP-3 and SCAP-4 is 4. The same procedure applies for SCAP-4 and SCAP-2. The capacity that may be used by the connection is now 4. +---------------------+ | Path9=1 | | +-------------+ | | | | | +------+ +------+ +-------+ +-------+ +------+ +------+ | | | |---------| |---------| |---------| | | | | | | | Path2=2 | | Path4=1 | | Path6=2 | | | | | |---------| |---------| |---------| |---------| |---------| | | TCP | Path1=4 | SCAP | | SCAP | | SCAP | | SCAP | Path8=4 | TCP | | Host |---------| 1 |---------| 3 |---------| 4 |---------| 2 |---------| Host | | | | | Path3=2 | | Path5=1 | | Path7=2 | | | | | | | |---------| |---------| |---------| | | | +------+ +------+ +-------+ +-------+ +------+ +------+ | | | | | +-------------+ | | Path10=1 | +---------------------+ > Thanks, > -- > Yoshifumi Nishida > > > On Mon, Feb 20, 2012 at 6:01 AM, wrote: >> Hi all, >> >> We have posted a new draft with the title: "A Transparent Performance >> Enhancing Proxy Architecture To Enable TCP over Multiple Paths for >> Single-Homed Hosts" >> (http://tools.ietf.org/html/draft-ayar-transparent-sca-proxy-00). >> >> In this draft, we define a TCP Splitter/Combiner Architecture (SCA) that >> enables non-MPTCP-capable single-homed hosts to benefit from the multiple >> paths within Internet by means of transparent performance enhancing proxies >> (PEPs). Since existence of the SCA is shielded from the TCP end-points, it >> can also be deployed on the TCP end-hosts. >> >> >> We invite everybody to read the draft and look forward to your comments. >> >> >> Thanks, >> >> Tacettin >> >> _______________________________________________ >> multipathtcp mailing list >> multipathtcp@ietf.org >> https://www.ietf.org/mailman/listinfo/multipathtcp > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp > > From c.raiciu@cs.ucl.ac.uk Fri Mar 16 05:48:55 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0454E21F8559 for ; Fri, 16 Mar 2012 05:48:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 3.401 X-Spam-Level: *** X-Spam-Status: No, score=3.401 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, GB_AFFORDABLE=1, GB_SUMOF=5] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uOyy+ECYLSp1 for ; Fri, 16 Mar 2012 05:48:53 -0700 (PDT) Received: from bells2.cs.ucl.ac.uk (bells2.cs.ucl.ac.uk [128.16.5.33]) by ietfa.amsl.com (Postfix) with ESMTP id 6D70E21F855A for ; Fri, 16 Mar 2012 05:48:53 -0700 (PDT) Received: from [141.85.37.203] (helo=[10.0.0.2]) by bells2.cs.ucl.ac.uk with esmtpsa (TLSv1:AES128-SHA:128) (C.Raiciu authenticated) (Exim 4.54) id 1S8WZt-000Baf-57; Fri, 16 Mar 2012 12:48:17 +0000 Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Costin Raiciu In-Reply-To: <20120315160314.10773yj9iszx8tki@webmail.tu-berlin.de> Date: Fri, 16 Mar 2012 14:48:34 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> <154773479ED2314980CB638A48FC44348915043D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <20120315160314.10773yj9iszx8tki@webmail.tu-berlin.de> To: Tacettin Ayar X-Mailer: Apple Mail (2.1084) Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2012 12:48:55 -0000 Hi, > Since MPTCP is designed to be used on multi-homed end-systems! > Scalability problems might occur when MPTCP is used on proxies. For > example, Section 5.3 of RFC 6182 mentions a case in which 12.5 MB > receive buffer space is needed. On end-hosts, it may be affordable. > But, on network devices with lots of TCP flows, processing and space > overhead MUST NOT be ignored. The statement above not correct.=20 Two important points: 1) MPTCP can also work between single-homed hosts as long as the network = implements Equal Cost Multipath or something similar. Here, MPTCP will = open multiple subflows between the same pair of IPs, and these subflows = will be placed (probabilistically) by the network on different paths. 2) MPTCP's receive buffer usage: fundamentally MPTCP (or any other = multipath transport) will have to use more receive buffer to account for = the different delays on the paths it uses. That is also true for any = solution you might come up with - unless you are willing to tolerate = sending a lot of reordered packets to the destination, which will then = kill throughput and nullify any performance benefits you have from using = your solution. In particular, if MPTCP works on paths with similar RTTs, its receive = buffer is equal to the sum of the receive buffers TCP would use on those = same paths . If MPTCP works on paths with (highly) disimilar RTTs, then its buffering = requirements become problematic (the exact formula is max_RTT * = sum(bw)).=20 We have created a bunch of algorithms that we have already put in the = Linux implementation (at the sender) that guarantee that: a) when MPTCP is underbuffered, it still does at least as well as TCP on = the best path with the same amount of buffer b) as more buffer becomes available, throughput gains due to MPTCP = increase. These algorithms are presented in our NSDI 2012 paper called "How Hard = Can It Be? Designing and implementing a deployable Multipath TCP". You = can find the paper here: = https://nets.cs.pub.ro/~costin/files/nsdi12-final125.pdf I also plan to present a quick summary of these algorithms during the = MPTCP WG meeting in Paris. Cheers, Costin From georg.hampel@alcatel-lucent.com Fri Mar 16 06:32:26 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D047921F8711 for ; Fri, 16 Mar 2012 06:32:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.236 X-Spam-Level: X-Spam-Status: No, score=-6.236 tagged_above=-999 required=5 tests=[AWL=-1.637, BAYES_00=-2.599, J_BACKHAIR_55=1, J_BACKHAIR_56=1, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IYU6VhAzlUxn for ; Fri, 16 Mar 2012 06:32:25 -0700 (PDT) Received: from ihemail3.lucent.com (ihemail3.lucent.com [135.245.0.37]) by ietfa.amsl.com (Postfix) with ESMTP id 0273D21F8715 for ; Fri, 16 Mar 2012 06:32:24 -0700 (PDT) Received: from usnavsmail2.ndc.alcatel-lucent.com (usnavsmail2.ndc.alcatel-lucent.com [135.3.39.10]) by ihemail3.lucent.com (8.13.8/IER-o) with ESMTP id q2GDWMbT021760 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 16 Mar 2012 08:32:22 -0500 (CDT) Received: from USNAVSXCHHUB02.ndc.alcatel-lucent.com (usnavsxchhub02.ndc.alcatel-lucent.com [135.3.39.111]) by usnavsmail2.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2GDWJtm025809 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Fri, 16 Mar 2012 08:32:19 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB02.ndc.alcatel-lucent.com ([135.3.39.111]) with mapi; Fri, 16 Mar 2012 08:32:19 -0500 From: "Hampel, K Georg (K Georg)" To: Tacettin Ayar , Yoshifumi Nishida Date: Fri, 16 Mar 2012 08:32:17 -0500 Thread-Topic: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 Thread-Index: Ac0CzEUi0Lg81ox/R/SmbgfRd8jxRQAn0fSw Message-ID: <154773479ED2314980CB638A48FC44348925F75D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> <20120315175404.80191jrtu2drnp9o@webmail.tu-berlin.de> In-Reply-To: <20120315175404.80191jrtu2drnp9o@webmail.tu-berlin.de> 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 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.37 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.10 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2012 13:32:26 -0000 Tacettin, I went through ref [1] you provided. It would be helpful if you could send = ref [2] on the ML. I didn't find it on the Internet. Apart from signaling capabilities, I'm trying to understand the principal d= ifferences between your SCAP proposal and MPTCP. If I understand it correctly SCAP performs "multipath routing with sub-flow= granularity" opposed to MPTCP performing "multipath transport".=20 SCAP steers packets along different paths by setting the packet IPs/ports a= ccordingly. MPTCP also applies a separate Seq No space + independent TCP si= gnaling (SYN/ACK handshake etc) to each path. SCAP is simpler than MPTCP but it is not middle-box compliant. Both solutions can be implemented on L3. We currently implement MPTCP on L3= for instance. Both solutions can be realized on end-hosts, proxies or a combination of bo= th. Both solutions can support "proxy" discovery, concatenated pipes, etc, prov= ided proper signaling.=20 Are these observations correct? If not what am I missing? Thanks. Regards, Georg -----Original Message----- From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of Tacettin Ayar Sent: Thursday, March 15, 2012 12:54 PM To: Yoshifumi Nishida Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-0= 0 Dear Yoshifumi, please find our answers to your comments inline. Best Regards, Tacettin et al Quoting Yoshifumi Nishida : > Hi Ayar, > > Sorry for the delay. I've finally found that time to read your draft. > The following points are not very clear to me. It would be great if > you could clarify. > > 1: It's not very clear to me what is the advantage of this protocol. > I think this approach presumes to utilize multiple paths between rout= ers. > hence, it looks to me we might be able to do the similar things by > using some kinds of multipath routing between these routers. > Or, if we run mptcp between two proxies, we might also be able to > do similar thing. > could you elaborate the feature of this approach compared to =20 > other approach? Multi-path routing can not fit all the needs of TCP over multiple =20 paths since performance of TCP flows is affected by the use of =20 multiple-paths (e.g., because of out-of-order packets). Thus, TCP =20 flows must be identified and side-effects of multi-path routing must =20 be cleared. Use of MPTCP between the proxies is not a good idea either, as MPTCP =20 is designed for TCP end-hosts. When used on proxies (with lots of TCP =20 flows) it will introduce too much overhead. > > 2: I think we'll need to know what kinds of signaling are used between > SCA proxies. > For example, how a SCA can find other SCAs? > SCAPs may use signaling for many purposes. For example, to probe for =20 other SCAPs, to inform the SCAP peer about other IP addresses of the =20 SCAP device, to send a series of packets to probe for pipe =20 characteristics (e.g., delay, capacity, loss rate), etc. There are also many available options for signaling between SCAPs. For =20 example, to find another SCAP a SCAP may: (1) flood SCAP peer probe =20 packets, (2) select some links for sending the SCAP probe packets =20 (e.g., using a multipath routing protocol), or (3) send the probe =20 packet only via the default TCP path, to name a few. However, we =20 haven't yet analyzed all these options in detail and they may be =20 subject to an extension of our draft. We believe that it is important =20 to agree on the architecture and get a broader support for it, before =20 going to the details of the signaling, which we obviously are willing =20 to deliver. Addressing your question, what we mentioned in our draft (Section 3.5) =20 is that signaling may be in-band, out-of-band, or hybrid. As an =20 example, in-band signaling may be used to probe for other SCAPs as =20 follows: a SCAP that receives a TCP connection request packet (packet =20 with SYN) adds a TCP option (e.g., SCAP-PROBE) to the packet to signal =20 its existence and address. Assume that the packet is sent via only =20 default TCP path. The packet will then follow the default TCP path =20 with SCAP-PROBE option. If there is another SCAP on the path, it will =20 recognize the SCAP-PROBE TCP option and obtain the address of the peer =20 SCAP that generated it in order to establish the contact. If there is =20 no SCAP on the path, then TCP receiver will ignore the unrecognized =20 option. The mentioned method is similar to the MPTCP, which uses MP_CAPABLE =20 option to look whether the peer supports MPTCP or not. Of course, =20 vulnerabilities exist (e.g., middleboxes that drop packets with =20 unknown TCP options or remove the unknown options from the packets), =20 same as for MPTCP. > 3: It's not clear to me how it is useful when there's only one SCA or > there are more than 2 SCAs on the path. Could you describe some > scenarios for them? > If there is only one SCAP between TCP sender and receiver, then we =20 may: (1) not use SCAP and rely on default single-path TCP or (2) use =20 SCAP to distribute TCP traffic over multiple paths. In the latter case =20 we have to consider the side-effects of the distribution (combining is =20 done at the receiver) . For example, Simula Proxy [1] uses path delay =20 estimations to calculate packet arrival times and buffer the =20 potentially out-of-order packets on the shorter paths, compensating =20 the different path delays. DUPACK estimation and filtering (DEF) [2] =20 uses path delays to estimate number of duplicate acknowledgements =20 caused by different path delays and shields them from the TCP sender. [1] K. Evensen, D. Kaspar, P. Engelstad, A. F. Hansen, C. Griwodz, and =20 P. Halvorsen, "A Network-Layer Proxy for Bandwidth Aggregation and =20 Reduction of IP Packet Reordering," IEEE 34th Conference on Local =20 Computer Networks (LCN 2009), pp. 585?592, October 2009. [2] T. Ayar, B. Rathke, L. Budzisz, and A. Wolisz, "TCP over Multiple =20 Paths Revisited: Towards Transparent Proxy Solutions," Accepted by The =20 IEEE International Conference on Communications 2012 (IEEE ICC'12), =20 June 2012. Use of two or more SCAPs is open to discussion. We present two =20 scenarios in which use of more than two SCAPs is beneficial. ----------- SCENARIO 1: ----------- Consider the following figure. There are two pipes between SCAP-1 and =20 SCAP-2: (Pipe1 passes through Path2 and Path4 and Pipe2 passes through =20 Path3 and Path5). In this case capacity of Pipe1 is limited by the capacity of Path4 =20 (i.e., 1) and capacity of Pipe2 is limited by the capacity of Path3 =20 (i.e., 1). The aggregate capacity that may be used by the connection =20 is then 2. +----+ +----+ +----+ +----+ +----+ | | | |-------| |-------| | | | | | | |Path2=3D4| |Path4=3D1| | | | | |-------| |-------| |-------| |-------| | |TCP |Path1=3D5|SCAP| |ROU | |SCAP|Path6=3D5| TCP| |Host|-------| 1 |-------|TER |-------| 2 |-------|Host| | | | |Path3=3D1| |Path5=3D4| | | | | | | |-------| |-------| | | | +----+ +----+ +----+ +----+ +----+ Now, assume that router is used as a SCAP device, as shown in the next =20 figure. In that case, SCAP-1 and SCAP-3 use two pipes: Pipe1=3DPath2 and =20 Pipe2=3DPath3. Since SCAP-3 combines packets from these two pipes, There =20 is aggregated capacity of 5 between SCAP-1 and SCAP-3. Similarly, The =20 aggregated capacity between SCAP-3 and SCAP-2 is also 5. Thus, =20 connection may use a capacity of 5. +----+ +----+ +----+ +----+ +----+ | | | |-------| |-------| | | | | | | |Path2=3D4| |Path4=3D1| | | | | |-------| |-------| |-------| |-------| | |TCP |Path1=3D5|SCAP| |SCAP| |SCAP|Path6=3D5| TCP| |Host|-------| 1 |-------| 3 |-------| 2 |-------|Host| | | | |Path3=3D1| |Path5=3D4| | | | | | | |-------| |-------| | | | +----+ +----+ +----+ +----+ +----+ ----------- SCENARIO 2: ----------- Now consider the following figure. SCAP-1 and SCAP-2 both have two =20 interfaces and may use the upper interface pair as a pipe (Pipe1 which =20 passes through Path2<->Path4<->Path6 or Path2<->Path9<->Path6) and =20 lower interface pair as a pipe (Pipe2 which passes through =20 Path3<->Path5<->Path7 or Path3<->Path10<->Path7). In this case capacity of Pipe1 is limited by the capacity of Path4 or =20 Path9 (i.e., 1) and capacity of Pipe2 is limited by the capacity of =20 Path5 or Path10 (i.e., 1), whichever path is used between the routers. =20 The capacity that may be used by the connection is 2. +---------------------+ | Path9=3D1 | | +-------------+ | | | | | +------+ +------+ +-------+ +-------+ =20 +------+ +------+ | | | |---------| |---------| =20 |---------| | | | | | | | Path2=3D2 | | Path4=3D1 | | Path6=3D2= =20 | | | | | |---------| |---------| |---------| =20 |---------| |---------| | | TCP | Path1=3D4 | SCAP | |ROUTER | |ROUTER | =20 | SCAP | Path8=3D4 | TCP | | Host |---------| 1 |---------| |---------| =20 |---------| 2 |---------| Host | | | | | Path3=3D2 | | Path5=3D1 | | Path7=3D2= =20 | | | | | | | |---------| |---------| =20 |---------| | | | +------+ +------+ +-------+ +-------+ =20 +------+ +------+ | | | | | +-------------+ | | Path10=3D1 | +---------------------+ Now, assume that routers are used as SCAP devices, as shown in the =20 following figure. In that case, SCAP-1 and SCAP-3 use two pipes: =20 Pipe1=3DPath2 and Pipe2=3DPath3. Since SCAP-3 combines packets from these = =20 two pipes, There is aggregated capacity of 4 between SCAP-1 and =20 SCAP-3. Similarly, SCAP-3 and SCAP-4 use four pipes: Pipe1=3DPath9, =20 Pipe2=3DPath4, Pipe3=3DPath5 and Pipe4=3DPath10. The aggregated capacity =20 between SCAP-3 and SCAP-4 is 4. The same procedure applies for SCAP-4 =20 and SCAP-2. The capacity that may be used by the connection is now 4. +---------------------+ | Path9=3D1 | | +-------------+ | | | | | +------+ +------+ +-------+ +-------+ =20 +------+ +------+ | | | |---------| |---------| =20 |---------| | | | | | | | Path2=3D2 | | Path4=3D1 | | Path6=3D2= =20 | | | | | |---------| |---------| |---------| =20 |---------| |---------| | | TCP | Path1=3D4 | SCAP | | SCAP | | SCAP | =20 | SCAP | Path8=3D4 | TCP | | Host |---------| 1 |---------| 3 |---------| 4 =20 |---------| 2 |---------| Host | | | | | Path3=3D2 | | Path5=3D1 | | Path7=3D2= =20 | | | | | | | |---------| |---------| =20 |---------| | | | +------+ +------+ +-------+ +-------+ =20 +------+ +------+ | | | | | +-------------+ | | Path10=3D1 | +---------------------+ > Thanks, > -- > Yoshifumi Nishida > > > On Mon, Feb 20, 2012 at 6:01 AM, wrote: >> Hi all, >> >> We have posted a new draft with the title: "A Transparent Performance >> Enhancing Proxy Architecture To Enable TCP over Multiple Paths for >> Single-Homed Hosts" >> (http://tools.ietf.org/html/draft-ayar-transparent-sca-proxy-00). >> >> In this draft, we define a TCP Splitter/Combiner Architecture (SCA) that >> enables non-MPTCP-capable single-homed hosts to benefit from the multipl= e >> paths within Internet by means of transparent performance enhancing prox= ies >> (PEPs). Since existence of the SCA is shielded from the TCP end-points, = it >> can also be deployed on the TCP end-hosts. >> >> >> We invite everybody to read the draft and look forward to your comments. >> >> >> Thanks, >> >> Tacettin >> >> _______________________________________________ >> multipathtcp mailing list >> multipathtcp@ietf.org >> https://www.ietf.org/mailman/listinfo/multipathtcp > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp > > _______________________________________________ multipathtcp mailing list multipathtcp@ietf.org https://www.ietf.org/mailman/listinfo/multipathtcp From ayar@tkn.tu-berlin.de Fri Mar 16 07:09:22 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 52F0121F858E for ; Fri, 16 Mar 2012 07:09:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.499 X-Spam-Level: X-Spam-Status: No, score=-2.499 tagged_above=-999 required=5 tests=[AWL=-2.250, BAYES_00=-2.599, GB_AFFORDABLE=1, GB_SUMOF=5, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 58Oe1Nb8zsKz for ; Fri, 16 Mar 2012 07:09:21 -0700 (PDT) Received: from mail.tu-berlin.de (mail.tu-berlin.de [130.149.7.33]) by ietfa.amsl.com (Postfix) with ESMTP id 79A6021F858A for ; Fri, 16 Mar 2012 07:09:21 -0700 (PDT) X-tubIT-Incoming-IP: 130.149.7.200 Received: from www.redaktion.tu-berlin.de ([130.149.7.200] helo=mailbox.tu-berlin.de) by mail.tu-berlin.de (exim-4.75/mailfrontend-3) with esmtp id 1S8XqD-00029v-Fs; Fri, 16 Mar 2012 15:09:18 +0100 Received: from 141.23.89.155 ([141.23.89.155]) by webmail.tu-berlin.de (Horde Framework) with HTTP; Fri, 16 Mar 2012 15:08:43 +0100 Message-ID: <20120316150843.1616463a4e6z412j@webmail.tu-berlin.de> Date: Fri, 16 Mar 2012 15:08:43 +0100 From: Tacettin Ayar To: Costin Raiciu References: <20120220150119.33111sskz80cevcf@webmail.tu-berlin.de> <154773479ED2314980CB638A48FC44348915043D@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <20120315160314.10773yj9iszx8tki@webmail.tu-berlin.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Internet Messaging Program (IMP) H3 (4.3.9) Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] A New Draft: draft-ayar-transparent-sca-proxy-00 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2012 14:09:22 -0000 Hi Costin, my comments are as follows. Best, Tacettin Quoting Costin Raiciu : > Hi, > >> Since MPTCP is designed to be used on multi-homed end-systems! >> Scalability problems might occur when MPTCP is used on proxies. For >> example, Section 5.3 of RFC 6182 mentions a case in which 12.5 MB >> receive buffer space is needed. On end-hosts, it may be affordable. >> But, on network devices with lots of TCP flows, processing and space >> overhead MUST NOT be ignored. > > The statement above not correct. > > Two important points: > > 1) MPTCP can also work between single-homed hosts as long as the > network implements Equal Cost Multipath or something similar. Here, > MPTCP will open multiple subflows between the same pair of IPs, and > these subflows will be placed (probabilistically) by the network on > different paths. It is just what we say! Something must be done within the NETWORK to supply multiple paths. > > 2) MPTCP's receive buffer usage: fundamentally MPTCP (or any other > multipath transport) will have to use more receive buffer to account > for the different delays on the paths it uses. That is also true for > any solution you might come up with - unless you are willing to > tolerate sending a lot of reordered packets to the destination, > which will then kill throughput and nullify any performance benefits > you have from using your solution. > > In particular, if MPTCP works on paths with similar RTTs, its > receive buffer is equal to the sum of the receive buffers TCP would > use on those same paths . > > If MPTCP works on paths with (highly) disimilar RTTs, then its > buffering requirements become problematic (the exact formula is > max_RTT * sum(bw)). > I read your discussion about it in RFC 6182 (the section that I gave to reference) and I have no objection to that. For this reason, we mention a select_pipes() method (Section 3.3) and pipe selection policy (Section 3.6) in our draft. As you said. When the paths with similar delays are used, then the gaps in the receive buffer will be filled quickly and it will not be a problem! Only, an inevitable overhead occurs when a packet is lost and retransmitted. Indeed, we are not against an MPTCP proxy! But, what we say is that, MPTCP proxy must consider these situations. For example, when the available paths have very dissimilar delays, then MPTCP SCAP should not admit them. An admission policy (Section 3.6) should be defined that is suitable for MPTCP. > We have created a bunch of algorithms that we have already put in > the Linux implementation (at the sender) that guarantee that: > a) when MPTCP is underbuffered, it still does at least as well as > TCP on the best path with the same amount of buffer > b) as more buffer becomes available, throughput gains due to MPTCP increase. > > These algorithms are presented in our NSDI 2012 paper called "How > Hard Can It Be? Designing and implementing a deployable Multipath > TCP". You can find the paper here: > https://nets.cs.pub.ro/~costin/files/nsdi12-final125.pdf I will read the paper. > > I also plan to present a quick summary of these algorithms during > the MPTCP WG meeting in Paris. > > Cheers, > Costin > > > From philip.eardley@bt.com Tue Mar 20 01:28:44 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E92C421F8619 for ; Tue, 20 Mar 2012 01:28:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.429 X-Spam-Level: X-Spam-Status: No, score=-103.429 tagged_above=-999 required=5 tests=[AWL=0.169, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VYSOgKg6WT5k for ; Tue, 20 Mar 2012 01:28:44 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp61.intersmtp.com [62.239.224.234]) by ietfa.amsl.com (Postfix) with ESMTP id 4197B21F8617 for ; Tue, 20 Mar 2012 01:28:44 -0700 (PDT) Received: from EVMHT63-UKRD.domain1.systemhost.net (10.36.3.100) by RDW083A005ED61.smtp-e1.hygiene.service (10.187.98.10) with Microsoft SMTP Server (TLS) id 8.3.213.0; Tue, 20 Mar 2012 08:28:43 +0000 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.2.164]) by EVMHT63-UKRD.domain1.systemhost.net ([10.36.3.100]) with mapi; Tue, 20 Mar 2012 08:28:42 +0000 From: To: Date: Tue, 20 Mar 2012 08:28:42 +0000 Thread-Topic: revised agenda Thread-Index: Ac0Gc3VhM5ZpZrYTThOxBhkrD5rw4Q== Message-ID: <9510D26531EF184D9017DF24659BB87F331D39D086@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331D39D086EMV65UKRDdoma_" MIME-Version: 1.0 Subject: [multipathtcp] revised agenda X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2012 08:28:45 -0000 --_000_9510D26531EF184D9017DF24659BB87F331D39D086EMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable http://www.ietf.org/proceedings/83/agenda/agenda-83-mptcp.txt revised agenda. Further agenda bashing possible. Please note that we are tight on time. We will be a bit flexible about the = length of the re-chartering discussion since this is something we must do, = therefore we may have to flex later items --_000_9510D26531EF184D9017DF24659BB87F331D39D086EMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

http://www.ietf.o= rg/proceedings/83/agenda/agenda-83-mptcp.txt

revised agenda.

Further agenda = bashing possible.

 

=

Please note that we are tight on time. We will be a bi= t flexible about the length of the re-chartering discussion since this is s= omething we must do, therefore we may have to flex later items <= /p>

 

= --_000_9510D26531EF184D9017DF24659BB87F331D39D086EMV65UKRDdoma_-- From philip.eardley@bt.com Tue Mar 20 01:40:25 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5E9F21F873C for ; Tue, 20 Mar 2012 01:40:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.435 X-Spam-Level: X-Spam-Status: No, score=-103.435 tagged_above=-999 required=5 tests=[AWL=0.163, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6h3ae5ehb7qv for ; Tue, 20 Mar 2012 01:40:23 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp63.intersmtp.com [62.239.224.236]) by ietfa.amsl.com (Postfix) with ESMTP id 64C7B21F8734 for ; Tue, 20 Mar 2012 01:40:22 -0700 (PDT) Received: from EVMHT69-UKRD.domain1.systemhost.net (10.36.3.129) by RDW083A007ED63.smtp-e3.hygiene.service (10.187.98.12) with Microsoft SMTP Server (TLS) id 8.3.213.0; Tue, 20 Mar 2012 08:40:21 +0000 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.2.164]) by EVMHT69-UKRD.domain1.systemhost.net ([10.36.3.129]) with mapi; Tue, 20 Mar 2012 08:40:21 +0000 From: To: Date: Tue, 20 Mar 2012 08:40:21 +0000 Thread-Topic: initial draft proposal for revised charter Thread-Index: Ac0GdRXjlcYExfCuQ7CO1JJUHNYNmA== Message-ID: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331D39D0AAEMV65UKRDdoma_" MIME-Version: 1.0 Subject: [multipathtcp] initial draft proposal for revised charter X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2012 08:40:26 -0000 --_000_9510D26531EF184D9017DF24659BB87F331D39D0AAEMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Since we have finished our current charter, we need to revise it. Here's a first attempt at this for comments. We will discuss the revised ch= arter in Paris, but please comment in the meantime as this will make our fa= ce-to-face time more effective. Two points to note & for comment: * It suggests we will work on a bis version of the protocol moving = it to standards track. This will be the current functionality + lessons fro= m implementations, interops etc * This would mean that new functionality is in experimental extensi= ons, rather than incorporated in the standards track doc * The text below is deliberately provocative in suggesting that the= only new functionality we work on is MPTCP proxy. This is just a guess bas= ed on recent mailing list activity. We have discussed several other topics = in the past. We need to define the list of new functionality we will work o= n during the next phase of the WG Thanks, Phil & Yoshifumi. -- Multipath TCP (mptcp) --------------------- Charter Current Status: Active Chairs: Philip Eardley Yoshifumi Nishida Transport Area Directors: Wesley Eddy David Harrington Transport Area Advisor: Wesley Eddy Mailing Lists: General Discussion: multipathtcp@ietf.org To Subscribe: https://www.ietf.org/mailman/listinfo/multipathtcp Archive: http://www.ietf.org/mail-archive/web/multipathtcp/ Description of Working Group: The Multipath TCP (MPTCP) working group develops mechanisms that add the capability of simultaneously using multiple paths to a regular TCP session. The primary output of the group will be the protocol extensions needed to deploy MPTCP, and adaptations to congestion control to safely support multipath resource sharing. Key goals for MPTCP are: to be deployable and usable without significant changes to existing Internet infrastructure; to be usable by unmodified applications; and to be stable and congestion-safe over the wide range of existing Internet paths, including NAT interactions. In its initial charter, the working group focussed on a solution requiring modification of both peers. One or both peers have multiple addresses, which often results in different network paths that are at least partially divergent (however, note there is no guarante= e that the paths are divergent at all). The WG defined a modular architecture that is designed to be easily extensible and adaptable, to allow (for example) a new mecha= nisms for congestion control or security, or alternative address management= schemes. The WG produced experimental or informational documents that defined: a. An architectural framework for congestion-dependent multipath transport protocols. It describes the motivations and the general approac= h that should be followed to enable congestion-dependent multipath transport. b. A security threat analysis for multipath TCP. c. A coupled multipath-aware congestion control algorithm. This algorithm is the multipath equivalent of SACK/NewReno congestion control. d. Extensions to current TCP to support multi-addressed multipath TCP. This covers all on-the-wire changes required to create a two-ended MPTCP solution using multiple addresses at one or both ends. It includes a basic security model. e. Application Interface Considerations. It summarizes the impact that MP= TCP may have on applications, such as changes in performance. Also, it des= cribes an optional, basic application interface for MPTCP-aware application= s that provides access to multipath address information and a level of cont= rol equivalent to regular TCP. The working group now re-charters with the goal of moving a bis version of = the protocol document from the Experimental to the Standards track. It requ= ires experience from implementations, experiments and use cases. The WG wil= l organise interop event(s). There already exists a reference Linux impleme= ntation and other implementation and experiment activity is on-going and wi= ll continue during 2012, with the objective of progressing the protocol to = standards track during 2013. The working group will also add new functionality, as Experimental extensio= n(s) to the core MPTCP protocol: * Proxy functionality * Nothing else envisaged at this stage * (the above two bullets are just a preliminary guess based on rece= nt mailing list activity) Finally, the working group will document useful information about: * advice about implementation specific heuristics * record interesting experiments (including interop events), experi= ences and use cases Goals and Milestones: to be defined --_000_9510D26531EF184D9017DF24659BB87F331D39D0AAEMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Since we have finished our cur= rent charter, we need to revise it.

Here’s a fir= st attempt at this for comments. We will discuss the revised charter in Par= is, but please comment in the meantime as this will make our face-to-face t= ime more effective.

Two points to note & for comme= nt:

·         It suggests we will work on a bis version of the protocol moving it t= o standards track. This will be the current functionality + lessons from im= plementations, interops etc

·         = This would mean that new functionality is in= experimental extensions, rather than incorporated in the standards track d= oc

·&= nbsp;        The text below is deliberately provocative in suggesting that the only = new functionality we work on is MPTCP proxy. This is just a guess based on = recent mailing list activity. We have discussed several other topics in the= past. We need to define the list of new functionality we will work on duri= ng the next phase of the WG

Thanks,

Phil & Yoshifumi.

--

Multipath = TCP (mptcp)

---------------------

 

Charter

<= p class=3DMsoNormal> 

Current Status: Active

 

Chairs:

=

     Philip Eardley <philip.eardley@bt.com><= o:p>

     Yoshifumi Nishida <ni= shida@sfc.wide.ad.jp>

 =

Transport Area Directors:

  &= nbsp;  Wesley Eddy <wes@mti-systems.com>

 

Transport Area Ad= visor:

     Wesley Eddy <w= es@mti-systems.com>

 

Mailing Lists:

     G= eneral Discussion: multipathtcp@ietf.org

 &n= bsp;   To Subscribe:       <= a href=3D"https://www.ietf.org/mailman/listinfo/multipathtcp">https://www.ietf.org/mailma= n/listinfo/multipathtcp

     Archi= ve:            http://www.ietf.org/mail-a= rchive/web/multipathtcp/

 

Description of Working Group:

 

  The Multipath TCP (MPTCP) working group develops= mechanisms that add the

  capability of sim= ultaneously using multiple paths to a regular TCP

  session. The primary output of the group will be the protocol exten= sions

  needed to deploy MPTCP, and adaptati= ons to congestion control to safely

  suppor= t multipath resource sharing.

 <= /span>

  Key goals for MPTCP are: to be deployable and usable = without significant

  changes to existing = Internet infrastructure; to be usable by unmodified

  of existing Internet paths,  in= cluding NAT interactions.

 

In its initial charter, the working group focussed on a solution=

  requiring modification of both peers. One= or both peers

  have multiple address= es, which often results in different network paths

  divergent at a= ll). The WG defined a modular architecture that is designed

  to be easily extensible and adaptable, to allow (for exam= ple) a new mechanisms for congestion control or security, or alternative ad= dress management schemes.

 

 

The WG produced experimental or = informational documents that defined:

 =

  a. An architectural framework for congestion-d= ependent multipath

  transport protocols. It= describes the motivations and the general approach that should<= /span>

  be followed to enable congestion-dependent multipath = transport.

 

&nb= sp; b. A security threat analysis for multipath TCP.

=

 

  c. A coupled multipath-aware c= ongestion control algorithm. This

  algorith= m is the multipath equivalent of SACK/NewReno congestion<= /p>

  control.

 =

  d. Extensions to current TCP to support multi-addressed mul= tipath TCP.

  This covers all on-the-wire ch= anges required to create a two-ended MPTCP

 = solution using multiple addresses at one or both ends. It includes a<= /o:p>

  basic security model.    &n= bsp;            = ;            &n= bsp;       

<= o:p> 

  e. Application Interface Considerati=
ons. It summarizes the impact that MPTCP may have on applications, such as =
changes in performance.  Also, it describes an optional, basic applica=
tion interface for MPTCP-aware applications that provides access to multipa=
th address information and a level of control equivalent to regular TCP.
 

 

 

The work= ing group now re-charters with the goal of moving a bis version of the prot= ocol document from the Experimental to the Standards track. It requires exp= erience from implementations, experiments and use cases. The WG will organi= se interop event(s). There already exists a reference Linux implementation = and other implementation and experiment activity is on-going and will conti= nue during 2012, with the objective of progressing the protocol to standard= s track during 2013.

 

The working group will also add new functionality, as Experimental ex= tension(s) to the core MPTCP protocol:

· &= nbsp;       Proxy functionalit= y

·       = ;  Nothing else envisaged at this stage

·          

         advice about implementation specific heuristics

·         record interesting experiments (including interop events), experiences = and use cases

 

 

Goals and Milestones: to be defined

 

 

 

&n= bsp;

= --_000_9510D26531EF184D9017DF24659BB87F331D39D0AAEMV65UKRDdoma_-- From georg.hampel@alcatel-lucent.com Tue Mar 20 12:20:09 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9000221F859F for ; Tue, 20 Mar 2012 12:20:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.054 X-Spam-Level: X-Spam-Status: No, score=-7.054 tagged_above=-999 required=5 tests=[AWL=-0.456, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2wxlIqwCzGFI for ; Tue, 20 Mar 2012 12:19:58 -0700 (PDT) Received: from ihemail4.lucent.com (ihemail4.lucent.com [135.245.0.39]) by ietfa.amsl.com (Postfix) with ESMTP id D99AC21F8555 for ; Tue, 20 Mar 2012 12:19:57 -0700 (PDT) Received: from usnavsmail2.ndc.alcatel-lucent.com (usnavsmail2.ndc.alcatel-lucent.com [135.3.39.10]) by ihemail4.lucent.com (8.13.8/IER-o) with ESMTP id q2KJJqFi005084 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 20 Mar 2012 14:19:52 -0500 (CDT) Received: from USNAVSXCHHUB01.ndc.alcatel-lucent.com (usnavsxchhub01.ndc.alcatel-lucent.com [135.3.39.110]) by usnavsmail2.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2KJJp1X009629 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Tue, 20 Mar 2012 14:19:51 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB01.ndc.alcatel-lucent.com ([135.3.39.110]) with mapi; Tue, 20 Mar 2012 14:19:51 -0500 From: "Hampel, K Georg (K Georg)" To: "philip.eardley@bt.com" , Yoshifumi Nishida , "multipathtcp@ietf.org" Date: Tue, 20 Mar 2012 14:19:50 -0500 Thread-Topic: initial draft proposal for revised charter Thread-Index: Ac0GdRXjlcYExfCuQ7CO1JJUHNYNmAAWAujg Message-ID: <154773479ED2314980CB638A48FC44348926010A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_154773479ED2314980CB638A48FC44348926010AUSNAVSXCHMBSA2n_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.39 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.10 Subject: Re: [multipathtcp] initial draft proposal for revised charter X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2012 19:20:09 -0000 --_000_154773479ED2314980CB638A48FC44348926010AUSNAVSXCHMBSA2n_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable All, I propose that the new charter explores alternative MPTCP implementations a= nd their respective tradeoff in feature support. The present design makes the implicit assumption that MPTCP is implemented = in the kernel's transport layer. While such implementation permits multipat= h operation under "worst-case" situations, i.e. when large variations in th= roughput and delay exist across multiple paths, it is also very cumbersome = to conduct. In more favorable multipath environments or when mobility support is suffic= ient, alternative implementation approaches, such as bump-in-the-stack with= zero-payload-buffering, can be pursued which are easier to conduct, provid= e better cross-platform portability and enable more economical proxy realiz= ations. Our efforts to realize such a L3 MPTCP implementation have identified a var= iety of issues where the present MPTCP design is too rigid. Note that other= protocols, e.g. IPsec (RFC 2401), explicitly consider different implementa= tion approaches. While exploring implementation alternatives, the new charter should ensure = full interoperability among all potential approaches. I think that MPTCP's applicability, market acceptance and deployability wou= ld greatly benefit from such charter extension. Comments are welcome. Thanks. Regards, Georg ________________________________ From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: Tuesday, March 20, 2012 4:40 AM To: multipathtcp@ietf.org Subject: [multipathtcp] initial draft proposal for revised charter Since we have finished our current charter, we need to revise it. Here's a first attempt at this for comments. We will discuss the revised ch= arter in Paris, but please comment in the meantime as this will make our fa= ce-to-face time more effective. Two points to note & for comment: * It suggests we will work on a bis version of the protocol moving = it to standards track. This will be the current functionality + lessons fro= m implementations, interops etc * This would mean that new functionality is in experimental extensio= ns, rather than incorporated in the standards track doc * The text below is deliberately provocative in suggesting that the = only new functionality we work on is MPTCP proxy. This is just a guess base= d on recent mailing list activity. We have discussed several other topics i= n the past. We need to define the list of new functionality we will work on= during the next phase of the WG Thanks, Phil & Yoshifumi. -- Multipath TCP (mptcp) --------------------- Charter Current Status: Active Chairs: Philip Eardley Yoshifumi Nishida Transport Area Directors: Wesley Eddy David Harrington Transport Area Advisor: Wesley Eddy Mailing Lists: General Discussion: multipathtcp@ietf.org To Subscribe: https://www.ietf.org/mailman/listinfo/multipathtcp Archive: http://www.ietf.org/mail-archive/web/multipathtcp/ Description of Working Group: The Multipath TCP (MPTCP) working group develops mechanisms that add the capability of simultaneously using multiple paths to a regular TCP session. The primary output of the group will be the protocol extensions needed to deploy MPTCP, and adaptations to congestion control to safely support multipath resource sharing. Key goals for MPTCP are: to be deployable and usable without significant changes to existing Internet infrastructure; to be usable by unmodified applications; and to be stable and congestion-safe over the wide range of existing Internet paths, including NAT interactions. In its initial charter, the working group focussed on a solution requiring modification of both peers. One or both peers have multiple addresses, which often results in different network paths that are at least partially divergent (however, note there is no guarante= e that the paths are divergent at all). The WG defined a modular architecture that is designed to be easily extensible and adaptable, to allow (for example) a new mecha= nisms for congestion control or security, or alternative address management= schemes. The WG produced experimental or informational documents that defined: a. An architectural framework for congestion-dependent multipath transport protocols. It describes the motivations and the general approac= h that should be followed to enable congestion-dependent multipath transport. b. A security threat analysis for multipath TCP. c. A coupled multipath-aware congestion control algorithm. This algorithm is the multipath equivalent of SACK/NewReno congestion control. d. Extensions to current TCP to support multi-addressed multipath TCP. This covers all on-the-wire changes required to create a two-ended MPTCP solution using multiple addresses at one or both ends. It includes a basic security model. e. Application Interface Considerations. It summarizes the impact that MP= TCP may have on applications, such as changes in performance. Also, it des= cribes an optional, basic application interface for MPTCP-aware application= s that provides access to multipath address information and a level of cont= rol equivalent to regular TCP. The working group now re-charters with the goal of moving a bis version of = the protocol document from the Experimental to the Standards track. It requ= ires experience from implementations, experiments and use cases. The WG wil= l organise interop event(s). There already exists a reference Linux impleme= ntation and other implementation and experiment activity is on-going and wi= ll continue during 2012, with the objective of progressing the protocol to = standards track during 2013. The working group will also add new functionality, as Experimental extensio= n(s) to the core MPTCP protocol: * Proxy functionality * Nothing else envisaged at this stage * (the above two bullets are just a preliminary guess based on rece= nt mailing list activity) Finally, the working group will document useful information about: * advice about implementation specific heuristics * record interesting experiments (including interop events), experi= ences and use cases Goals and Milestones: to be defined --_000_154773479ED2314980CB638A48FC44348926010AUSNAVSXCHMBSA2n_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

All,

 

I propose that the new charter explores alternative MPTCP implementations and their respective tradeoff in feature support.  

 

The present design makes the implicit assumption that MPTCP is implemented in the kernel’s transport layer.= While such implementation permits multipath operation under “worst-caseR= 21; situations, i.e. when large variations in throughput and delay exist across multiple pa= ths, it is also very cumbersome to conduct.

 

In more favorable multipath environments= or when mobility support is sufficient, alternative implementation approaches, such= as bump-in-the-stack with zero-payload-buffering, can be pursued which are eas= ier to conduct, provide better cross-platform portability and enable more econo= mical proxy realizations.

 

Our efforts to realize such a L3 MPTCP implementation have identified a variety of issues where the present MPTCP = design is too rigid. Note that other protocols, e.g. IPsec (RFC 2401), explicitly consider different implementation approaches.

 

While exploring implementation alternati= ves, the new charter should ensure full interoperability among all potential app= roaches.

 

I think that MPTCP’s applicability= , market acceptance and deployability would greatly benefit from such charter extens= ion.

 

Comments are welcome. Thanks.=


Regards,

 

Georg

 

 

 

From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] On Behalf Of philip.eardley@bt.com Sent: Tuesday, March 20, 201= 2 4:40 AM
To: multipathtcp@ietf.org Subject: [multipathtcp] init= ial draft proposal for revised charter

 

Since= we have finished our current charter, we need to revise it.

Here&= #8217;s a first attempt at this for comments. We will discuss the revised charter in Paris, but please= comment in the meantime as this will make our face-to-face time more effective.

Two p= oints to note & for comment:

· = ;        It suggests= we will work on a bis version of the protocol moving it to standards track. Th= is will be the current functionality + lessons from implementations, interops = etc

·<= span style=3D'font:7.0pt "Times New Roman"'>      =   This = would mean that new functionality is in experimental extensions, rather than incorporated in the standards track doc

·<= span style=3D'font:7.0pt "Times New Roman"'>      =   The t= ext below is deliberately provocative in suggesting that the only new functiona= lity we work on is MPTCP proxy. This is just a guess based on recent mailing lis= t activity. We have discussed several other topics in the past. We need to de= fine the list of new functionality we will work on during the next phase of the = WG

Thank= s,

Phil = & Yoshifumi.

--

Multipath TCP (mptcp)<= o:p>

---------------------<= o:p>

 

Charter

 

Current Status: Active=

 

Chairs:

   &nbs= p; Philip Eardley <philip.eardley@bt.com>

   &nbs= p; Yoshifumi Nishida <nishida@sfc.wide.ad.jp>

 

Transport Area Directo= rs:

   &nbs= p; Wesley Eddy <wes@mti-systems.com>

   &nbs= p; David Harrington <ietfdbh@comcast.net>

 

Transport Area Advisor= :

   &nbs= p; Wesley Eddy <wes@mti-systems.com>

 

Mailing Lists:

   &nbs= p; General Discussion: multipathtcp@ietf.org

   &nbs= p; To Subscribe:       https://www.ietf.org/mailman/listinfo/multipathtcp

   &nbs= p; Archive:            = http://www.ietf.org/mail-archive/web/multipathtcp/

 

Description of Working Group:

 

  The Multipath T= CP (MPTCP) working group develops mechanisms that add the

  capability of simultaneously using multiple paths to a regular TCP

  session. The pr= imary output of the group will be the protocol extensions

  needed to deplo= y MPTCP, and adaptations to congestion control to safely

  support multipa= th resource sharing.

 

  Key goals for M= PTCP are: to be deployable and usable without significant

  changes to exis= ting Internet infrastructure; to be usable by unmodified

  applications; a= nd to be stable and congestion-safe over the wide range<= /p>

  of existing Int= ernet paths,  including NAT interactions.

 

In its initial charter= , the working group focussed on a solution

  requiring modification of both peers. One or both peers

  have multi= ple addresses, which often results in different network paths=

  that are at lea= st partially divergent (however, note there is no guarantee that the paths are=

  divergent at al= l). The WG defined a modular architecture that is designed

  to be easily extensible and adaptable, to allow (for example) a new mechanisms for congestion control or security, or alternative address management schemes.<= o:p>

 

 

The WG produced experi= mental or informational documents that defined:

 

  a. An architect= ural framework for congestion-dependent multipath

  transport proto= cols. It describes the motivations and the general approach that should

  be followed to = enable congestion-dependent multipath transport.

 

  b. A security t= hreat analysis for multipath TCP.

 

  c. A coupled multipath-aware congestion control algorithm. This=

  algorithm is th= e multipath equivalent of SACK/NewReno congestion

  control. <= /o:p>

 

  d. Extensions t= o current TCP to support multi-addressed multipath TCP.

  This covers all on-the-wire changes required to create a two-ended MPTCP<= /font>

  solution using multiple addresses at one or both ends. It includes a

  basic security model.           &nb= sp;            =             &nb= sp;

 

  e. Application Interface Considerations. It summarizes t=
he impact that MPTCP may have on applications, such as changes in performan=
ce.  Also, it describes an optional, basic application interface for M=
PTCP-aware applications that provides access to multipath address informati=
on and a level of control equivalent to regular TCP.
 

 

 

 

The working group now re-charters with the goal of moving a bis version of the protocol document = from the Experimental to the Standards track. It requires experience from implementations, experiments and use cases. The WG will organise interop event(s). There already exists a reference Linux implementation and other implementation and experiment activity is on-going and will continue during= 2012, with the objective of progressing the protocol to standards track during 20= 13.

 

The working group will= also add new functionality, as Experimental extension(s) to the core MPTCP proto= col:

·<= span style=3D'font:7.0pt "Times New Roman"'>      =    Proxy functionality

·         Nothing e= lse envisaged at this stage

·         (the abov= e two bullets are just a preliminary guess based on recent mailing list activity)=

 

Finally, the working g= roup will document useful information about:

·<= span style=3D'font:7.0pt "Times New Roman"'>      =    advice ab= out implementation specific heuristics

·         record interesting experiments (including interop events), experiences and use cas= es

 

 

Goals and Milestones: = to be defined

 

 

 

 

--_000_154773479ED2314980CB638A48FC44348926010AUSNAVSXCHMBSA2n_-- From internet-drafts@ietf.org Mon Mar 26 00:39:24 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B234F21F8503; Mon, 26 Mar 2012 00:39:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.414 X-Spam-Level: X-Spam-Status: No, score=-102.414 tagged_above=-999 required=5 tests=[AWL=0.185, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TG1ntKGhwEdo; Mon, 26 Mar 2012 00:39:24 -0700 (PDT) Received: from ietfa.amsl.com (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1427E21F84F7; Mon, 26 Mar 2012 00:39:24 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: internet-drafts@ietf.org To: i-d-announce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 4.00 Message-ID: <20120326073924.23449.19517.idtracker@ietfa.amsl.com> Date: Mon, 26 Mar 2012 00:39:24 -0700 Cc: multipathtcp@ietf.org Subject: [multipathtcp] I-D Action: draft-ietf-mptcp-multiaddressed-07.txt X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Mar 2012 07:39:24 -0000 A New Internet-Draft is available from the on-line Internet-Drafts director= ies. This draft is a work item of the Multipath TCP Working Group of the IE= TF. Title : TCP Extensions for Multipath Operation with Multiple Add= resses Author(s) : Alan Ford Costin Raiciu Mark Handley Olivier Bonaventure Filename : draft-ietf-mptcp-multiaddressed-07.txt Pages : 60 Date : 2012-03-26 TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network, and thus improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously use multiple paths between peers. This document presents a set of extensions to traditional TCP to support multipath operation. The protocol offers the same type of service to applications as TCP (i.e. reliable bytestream), and provides the components necessary to establish and use multiple TCP flows across potentially disjoint paths. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-mptcp-multiaddressed-07.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ This Internet-Draft can be retrieved at: ftp://ftp.ietf.org/internet-drafts/draft-ietf-mptcp-multiaddressed-07.txt From philip.eardley@bt.com Tue Mar 27 07:21:13 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D544121E80CA for ; Tue, 27 Mar 2012 07:21:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.455 X-Spam-Level: X-Spam-Status: No, score=-103.455 tagged_above=-999 required=5 tests=[AWL=0.143, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6xatL44AvvT0 for ; Tue, 27 Mar 2012 07:21:12 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp62.intersmtp.com [62.239.224.235]) by ietfa.amsl.com (Postfix) with ESMTP id 6D9D421F889A for ; Tue, 27 Mar 2012 07:21:12 -0700 (PDT) Received: from EVMHT69-UKRD.domain1.systemhost.net (10.36.3.129) by RDW083A006ED62.smtp-e2.hygiene.service (10.187.98.11) with Microsoft SMTP Server (TLS) id 8.3.213.0; Tue, 27 Mar 2012 15:21:12 +0100 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.102]) by EVMHT69-UKRD.domain1.systemhost.net ([10.36.3.129]) with mapi; Tue, 27 Mar 2012 15:21:10 +0100 From: To: , Date: Tue, 27 Mar 2012 15:21:10 +0100 Thread-Topic: Slides for Friday's MPTCP meeting Thread-Index: AQHNDCTbPlbWzE8AN0eqBDCrQxfOzQ== Message-ID: <9510D26531EF184D9017DF24659BB87F331DE0C421@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US, en-GB Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331DE0C421EMV65UKRDdoma_" MIME-Version: 1.0 Subject: [multipathtcp] Slides for Friday's MPTCP meeting X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2012 14:21:14 -0000 --_000_9510D26531EF184D9017DF24659BB87F331DE0C421EMV65UKRDdoma_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Presenters - Please send your slides to me & Yoshifumi by Thursday lunchtim= e - and thanks to Alan whos already sent his! Also, it would be very helpful for people to volunteer to be note-takers an= d jabber scribes in advance, as we have a full agenda thanks --_000_9510D26531EF184D9017DF24659BB87F331DE0C421EMV65UKRDdoma_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Present= ers - Please send your slides to me & Yoshifumi by Thursday lunchtime -= and thanks to Alan whos already sent his!
 
Also, it would be very helpful for p= eople to volunteer to be note-takers and jabber scribes in advance, as we h= ave a full agenda
 
thanks
--_000_9510D26531EF184D9017DF24659BB87F331DE0C421EMV65UKRDdoma_-- From georg.hampel@alcatel-lucent.com Tue Mar 27 11:04:44 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3190121E808D for ; Tue, 27 Mar 2012 11:04:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.008 X-Spam-Level: X-Spam-Status: No, score=-9.008 tagged_above=-999 required=5 tests=[AWL=1.590, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6UHtloqY39sT for ; Tue, 27 Mar 2012 11:04:40 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id 3B7D821F87D4 for ; Tue, 27 Mar 2012 11:04:40 -0700 (PDT) Received: from usnavsmail2.ndc.alcatel-lucent.com (usnavsmail2.ndc.alcatel-lucent.com [135.3.39.10]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id q2RI4WMh029044 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 27 Mar 2012 13:04:33 -0500 (CDT) Received: from USNAVSXCHHUB03.ndc.alcatel-lucent.com (usnavsxchhub03.ndc.alcatel-lucent.com [135.3.39.112]) by usnavsmail2.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2RI3v4o013283 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Tue, 27 Mar 2012 13:04:31 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB03.ndc.alcatel-lucent.com ([135.3.39.112]) with mapi; Tue, 27 Mar 2012 13:04:12 -0500 From: "Hampel, K Georg (K Georg)" To: "multipathtcp@ietf.org" , "philip.eardley@bt.com" , Yoshifumi Nishida Date: Tue, 27 Mar 2012 13:04:11 -0500 Thread-Topic: Proposal for revised charter: MPTCP MOBILITY Thread-Index: Ac0GdRXjlcYExfCuQ7CO1JJUHNYNmAFyNq5A Message-ID: <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_154773479ED2314980CB638A48FC44348935901AUSNAVSXCHMBSA2n_" MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.10 Subject: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2012 18:04:45 -0000 --_000_154773479ED2314980CB638A48FC44348935901AUSNAVSXCHMBSA2n_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable All, I'm proposing to add MOBILITY to MPTCP's revised charter, for the following= reasons: 1) Strong use case: MPTCP allows 3G/4G mobility operators to dynamically offload traffic from t= heir air interface to unlicensed spectrum. When deployed as end-to-end solu= tion, it also permits dynamically offloading the 3G/4G core. Together with = MPTCP's middlebox compliance, there is no other solution that offers such f= eatures. 2) Implementation sweet spot: MPTCP-mobility can be realized via simple implementation below transport la= yer while being fully interoperable with full-blown MPTCP. Using the same i= mplementation, proxy operation can be conducted in a very resource-efficien= t manner. This makes MPTCP rollout fast and proxy operation low-cost. 3) Buzz: There is a large group of people, e.g. mobile operators, interested to find= a solution to the above use case and they NEVER think of MPTCP unless it g= ets the term "MOBILITY" explicitly spelled out in its charter! In other words: I think we are missing out on a great opportunity if we do = NOT put MOBILITY onto the revised charter. Thanks. Regards, Georg ________________________________ From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of philip.eardley@bt.com Sent: Tuesday, March 20, 2012 9:40 AM To: multipathtcp@ietf.org Subject: [multipathtcp] initial draft proposal for revised charter Since we have finished our current charter, we need to revise it. Here's a first attempt at this for comments. We will discuss the revised ch= arter in Paris, but please comment in the meantime as this will make our fa= ce-to-face time more effective. Two points to note & for comment: * It suggests we will work on a bis version of the protocol moving = it to standards track. This will be the current functionality + lessons fro= m implementations, interops etc * This would mean that new functionality is in experimental extensio= ns, rather than incorporated in the standards track doc * The text below is deliberately provocative in suggesting that the = only new functionality we work on is MPTCP proxy. This is just a guess base= d on recent mailing list activity. We have discussed several other topics i= n the past. We need to define the list of new functionality we will work on= during the next phase of the WG Thanks, Phil & Yoshifumi. -- Multipath TCP (mptcp) --------------------- Charter Current Status: Active Chairs: Philip Eardley Yoshifumi Nishida Transport Area Directors: Wesley Eddy David Harrington Transport Area Advisor: Wesley Eddy Mailing Lists: General Discussion: multipathtcp@ietf.org To Subscribe: https://www.ietf.org/mailman/listinfo/multipathtcp Archive: http://www.ietf.org/mail-archive/web/multipathtcp/ Description of Working Group: The Multipath TCP (MPTCP) working group develops mechanisms that add the capability of simultaneously using multiple paths to a regular TCP session. The primary output of the group will be the protocol extensions needed to deploy MPTCP, and adaptations to congestion control to safely support multipath resource sharing. Key goals for MPTCP are: to be deployable and usable without significant changes to existing Internet infrastructure; to be usable by unmodified applications; and to be stable and congestion-safe over the wide range of existing Internet paths, including NAT interactions. In its initial charter, the working group focussed on a solution requiring modification of both peers. One or both peers have multiple addresses, which often results in different network paths that are at least partially divergent (however, note there is no guarante= e that the paths are divergent at all). The WG defined a modular architecture that is designed to be easily extensible and adaptable, to allow (for example) a new mecha= nisms for congestion control or security, or alternative address management= schemes. The WG produced experimental or informational documents that defined: a. An architectural framework for congestion-dependent multipath transport protocols. It describes the motivations and the general approac= h that should be followed to enable congestion-dependent multipath transport. b. A security threat analysis for multipath TCP. c. A coupled multipath-aware congestion control algorithm. This algorithm is the multipath equivalent of SACK/NewReno congestion control. d. Extensions to current TCP to support multi-addressed multipath TCP. This covers all on-the-wire changes required to create a two-ended MPTCP solution using multiple addresses at one or both ends. It includes a basic security model. e. Application Interface Considerations. It summarizes the impact that MP= TCP may have on applications, such as changes in performance. Also, it des= cribes an optional, basic application interface for MPTCP-aware application= s that provides access to multipath address information and a level of cont= rol equivalent to regular TCP. The working group now re-charters with the goal of moving a bis version of = the protocol document from the Experimental to the Standards track. It requ= ires experience from implementations, experiments and use cases. The WG wil= l organise interop event(s). There already exists a reference Linux impleme= ntation and other implementation and experiment activity is on-going and wi= ll continue during 2012, with the objective of progressing the protocol to = standards track during 2013. The working group will also add new functionality, as Experimental extensio= n(s) to the core MPTCP protocol: * Proxy functionality * Nothing else envisaged at this stage * (the above two bullets are just a preliminary guess based on rece= nt mailing list activity) Finally, the working group will document useful information about: * advice about implementation specific heuristics * record interesting experiments (including interop events), experi= ences and use cases Goals and Milestones: to be defined --_000_154773479ED2314980CB638A48FC44348935901AUSNAVSXCHMBSA2n_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

All,

 

I’m proposing to add MOBILITY to MPTCP’s revised charter, for the following reasons:=

 

1)      = Strong use case:

= MPTCP allows 3G/4G mobility operators to dynamically offload traffic from their air interface to unlicensed spectrum. When deployed as end-to-end solution, it = also permits dynamically offloading the 3G/4G core. Together with MPTCP’s middlebox compliance, there is no other solution that offers such features.=

=  

2)      = Implementation sweet spot:

= MPTCP-mobility can be realized via simple implementation below transport layer while being fully interoperable with full-blown MPTCP. Using the same implementation, p= roxy operation can be conducted in a very resource-efficient manner. This makes = MPTCP rollout fast and proxy operation low-cost.

=  

= 3)   Buzz:

= There is a large group of people, e.g. mobile operators, interested to find a soluti= on to the above use case and they NEVER think of MPTCP unless it gets the term= “MOBILITY” explicitly spelled out in its charter!

=  

In other words: I think we are missing= out on a great opportunity if we do NOT put MOBILITY onto the revised charter. = Thanks.

 

Regards,

Georg

=  

=  

=  

 

 

From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] On Behalf Of philip.eardley@bt.com Sent: Tuesday, March 20, 201= 2 9:40 AM
To: multipathtcp@ietf.org Subject: [multipathtcp] init= ial draft proposal for revised charter

 

Since= we have finished our current charter, we need to revise it.

Here&= #8217;s a first attempt at this for comments. We will discuss the revised charter in = Paris, but please= comment in the meantime as this will make our face-to-face time more effective.

Two p= oints to note & for comment:

· = ;        It suggests= we will work on a bis version of the protocol moving it to standards track. Th= is will be the current functionality + lessons from implementations, interops = etc

·<= span style=3D'font:7.0pt "Times New Roman"'>      =   This = would mean that new functionality is in experimental extensions, rather than incorporated in the standards track doc

·<= span style=3D'font:7.0pt "Times New Roman"'>      =   The t= ext below is deliberately provocative in suggesting that the only new functiona= lity we work on is MPTCP proxy. This is just a guess based on recent mailing lis= t activity. We have discussed several other topics in the past. We need to de= fine the list of new functionality we will work on during the next phase of the = WG

Thank= s,

Phil = & Yoshifumi.

--

Multipath TCP (mptcp)<= o:p>

---------------------<= o:p>

 

Charter

 

Current Status: Active=

 

Chairs:

   &nbs= p; Philip Eardley <philip.eardley@bt.com>

   &nbs= p; Yoshifumi Nishida <nishida@sfc.wide.ad.jp>

 

Transport Area Directo= rs:

   &nbs= p; Wesley Eddy <wes@mti-systems.com>

   &nbs= p; David Harrington <ietfdbh@comcast.net>

 

Transport Area Advisor= :

   &nbs= p; Wesley Eddy <wes@mti-systems.com>

 

Mailing Lists:

   &nbs= p; General Discussion: multipathtcp@ietf.org

   &nbs= p; To Subscribe:       https://www.ietf.org/mailman/listinfo/multipathtcp

   &nbs= p; Archive:            = http://www.ietf.org/mail-archive/web/multipathtcp/

 

Description of Working Group:

 

  The Multipath T= CP (MPTCP) working group develops mechanisms that add the

  capability of simultaneously using multiple paths to a regular TCP

  session. The pr= imary output of the group will be the protocol extensions

  needed to deplo= y MPTCP, and adaptations to congestion control to safely

  support multipa= th resource sharing.

 

  Key goals for M= PTCP are: to be deployable and usable without significant

  changes to exis= ting Internet infrastructure; to be usable by unmodified

  applications; a= nd to be stable and congestion-safe over the wide range<= /p>

  of existing Int= ernet paths,  including NAT interactions.

 

In its initial charter= , the working group focussed on a solution

  requiring modification of both peers. One or both peers

  have multi= ple addresses, which often results in different network paths=

  that are at lea= st partially divergent (however, note there is no guarantee that the paths are=

  divergent at al= l). The WG defined a modular architecture that is designed

  to be easily extensible and adaptable, to allow (for example) a new mechanisms for congestion control or security, or alternative address management schemes.<= o:p>

 

 

The WG produced experi= mental or informational documents that defined:

 

  a. An architect= ural framework for congestion-dependent multipath

  transport proto= cols. It describes the motivations and the general approach that should

  be followed to = enable congestion-dependent multipath transport.

 

  b. A security t= hreat analysis for multipath TCP.

 

  c. A coupled multipath-aware congestion control algorithm. This=

  algorithm is th= e multipath equivalent of SACK/NewReno congestion

  control. <= /o:p>

 

  d. Extensions t= o current TCP to support multi-addressed multipath TCP.

  This covers all on-the-wire changes required to create a two-ended MPTCP<= /font>

  solution using multiple addresses at one or both ends. It includes a

  basic security model.           &nb= sp;            =             &nb= sp;

 

  e. Application Interface Considerations. It summarizes t=
he impact that MPTCP may have on applications, such as changes in performan=
ce.  Also, it describes an optional, basic application interface for M=
PTCP-aware applications that provides access to multipath address informati=
on and a level of control equivalent to regular TCP.
 

 

 

 

The working group now re-charters with the goal of moving a bis version of the protocol document = from the Experimental to the Standards track. It requires experience from implementations, experiments and use cases. The WG will organise interop event(s). There already exists a reference Linux implementation and other implementation and experiment activity is on-going and will continue during 2012, with the objective of progressing the protocol to standards track dur= ing 2013.

 

The working group will= also add new functionality, as Experimental extension(s) to the core MPTCP proto= col:

·<= span style=3D'font:7.0pt "Times New Roman"'>      =    Proxy functionality

·         Nothing e= lse envisaged at this stage

·         (the abov= e two bullets are just a preliminary guess based on recent mailing list activity)=

 

Finally, the working g= roup will document useful information about:

·<= span style=3D'font:7.0pt "Times New Roman"'>      =    advice ab= out implementation specific heuristics

·         record interesting experiments (including interop events), experiences and use cas= es

 

 

Goals and Milestones: = to be defined

 

 

 

 

--_000_154773479ED2314980CB638A48FC44348935901AUSNAVSXCHMBSA2n_-- From olivier.bonaventure@uclouvain.be Tue Mar 27 12:40:47 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E4DA21E8133 for ; Tue, 27 Mar 2012 12:40:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id a731qbM6VrBD for ; Tue, 27 Mar 2012 12:40:46 -0700 (PDT) Received: from smtp6.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id 371F921E80AD for ; Tue, 27 Mar 2012 12:40:46 -0700 (PDT) Received: from mbpobo.local (host-85-27-91-91.brutele.be [85.27.91.91]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: obonaventure@smtp6.sgsi.ucl.ac.be) by smtp6.sgsi.ucl.ac.be (Postfix) with ESMTPSA id C35351C5A7B; Tue, 27 Mar 2012 21:40:39 +0200 (CEST) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp6.sgsi.ucl.ac.be C35351C5A7B DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1332877239; bh=23Ju//9I/uUhlxwweadi1RukplkK2GibEK3W3CcwLuA=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=io6fAFGIse1EmJ7NImJ15/Qc66q+Jr/VQSRIADTD73CoH+LtQwsOomGJk4KjM0/v8 UgAbXgRLiE93hgdqBF7X1NUbo3gb6Io0gPrweLryYHkbVn+M7HZEtXDdVA2KnwjbKm re3LCiOlNPAeIOgqq+K63uZ6BrEEZI5Ap+WQ+S4k= Message-ID: <4F7217B7.5030005@uclouvain.be> Date: Tue, 27 Mar 2012 21:40:39 +0200 From: Olivier Bonaventure User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120313 Thunderbird/11.0 MIME-Version: 1.0 To: "Hampel, K Georg (K Georg)" References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.97.3-exp at smtp-6.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: C35351C5A7B.A2DD0 X-SGSI-MailScanner: Found to be clean X-SGSI-From: olivier.bonaventure@uclouvain.be X-SGSI-Spam-Status: No Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: Olivier.Bonaventure@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2012 19:40:47 -0000 Georg, > > I’m proposing to add MOBILITY to MPTCP’s revised charter, for the > following reasons: > > > > 1) Strong use case: > > MPTCP allows 3G/4G mobility operators to dynamically offload traffic > from their air interface to unlicensed spectrum. When deployed as > end-to-end solution, it also permits dynamically offloading the 3G/4G > core. Together with MPTCP’s middlebox compliance, there is no other > solution that offers such features. > This already works with the current specification. We have an implementation that is already able to perfom WiFi/3G offload and we are performing measurements in real networks. We already have some experience to prepare a report describing how MPTCP can be used in mobile environments. If the WG thinks that such a report would be useful, we can prepare a first draft. Based on our previous work, we also have some ideas on the datacenter usecase for MPTCP and could also contribute to an applicability draft in this domain. > 2) Implementation sweet spot: > > MPTCP-mobility can be realized via simple implementation below transport > layer while being fully interoperable with full-blown MPTCP. Using the > same implementation, proxy operation can be conducted in a very > resource-efficient manner. This makes MPTCP rollout fast and proxy > operation low-cost. The main benefit of MPTCP compared to network layer solutions is that the congestion control scheme is aware of the path changes and can react appropriately. I'm not sure I completely understand the benefits and limitations of your proposed simple implementation. An important point for the acceptance of MPTCP will be interoperability reports from at least two different implementations. Our implementation is now almost completely compliant. We'd be happy to perform interoperability tests with any other implementation. > 3) Buzz: > > There is a large group of people, e.g. mobile operators, interested to > find a solution to the above use case and they NEVER think of MPTCP > unless it gets the term “MOBILITY” explicitly spelled out in its charter! Mobile network operators willing to see a demonstration of MPTCP in a mobile Wifi/3G offload scenario can contact us offline... Olivier -- INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From olivier.bonaventure@uclouvain.be Tue Mar 27 12:43:56 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8992421F8796 for ; Tue, 27 Mar 2012 12:43:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id um-r3stQVK+M for ; Tue, 27 Mar 2012 12:43:55 -0700 (PDT) Received: from smtp6.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id 94A6021F8795 for ; Tue, 27 Mar 2012 12:43:55 -0700 (PDT) Received: from mbpobo.local (host-85-27-91-91.brutele.be [85.27.91.91]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: obonaventure@smtp6.sgsi.ucl.ac.be) by smtp6.sgsi.ucl.ac.be (Postfix) with ESMTPSA id 989551C5965; Tue, 27 Mar 2012 21:43:50 +0200 (CEST) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp6.sgsi.ucl.ac.be 989551C5965 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1332877430; bh=W1njd1hYcYj511wZzuBGbkzubaeoeLQpH9eWh426b38=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=NTdTuF5HTqxAlVlbf0NRQ61qJS3sU7OTYIumO73CmnTaNdmW1vWAtZc4j87gQ/qbK LvsVpTvlo/da/yS0qgzKWotFK20OyUmgGH2ub1bWI1knCLqsjnko2wrAHbbMzLuxef nSHNikdMK3SX8ZxPzJbufsB15m+tzrPK1WSh6zmY= Message-ID: <4F721876.8060505@uclouvain.be> Date: Tue, 27 Mar 2012 21:43:50 +0200 From: Olivier Bonaventure User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120313 Thunderbird/11.0 MIME-Version: 1.0 To: philip.eardley@bt.com References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> In-Reply-To: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.97.3-exp at smtp-6.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: 989551C5965.A0F9A X-SGSI-MailScanner: Found to be clean X-SGSI-From: olivier.bonaventure@uclouvain.be X-SGSI-Spam-Status: No Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] initial draft proposal for revised charter X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: Olivier.Bonaventure@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2012 19:43:56 -0000 Phil, > Since we have finished our current charter, we need to revise it. > > Here’s a first attempt at this for comments. We will discuss the revised > charter in Paris, but please comment in the meantime as this will make > our face-to-face time more effective. > Two points to note & for comment: > > · It suggests we will work on a bis version of the protocol > moving it to standards track. This will be the current functionality + > lessons from implementations, interops etc It is important to document lessons from implementations and we should organise interop events as soon as another implementation becomes available. > · This would mean that new functionality is in experimental > extensions, rather than incorporated in the standards track doc > · The text below is deliberately provocative in suggesting that > the only new functionality we work on is MPTCP proxy. This is just a > guess based on recent mailing list activity. We have discussed several > other topics in the past. We need to define the list of new > functionality we will work on during the next phase of the WG The MPTCP proxy is an important problem that needs to be solved. I fully support including it in the charter. Olivier -- INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From georg.hampel@alcatel-lucent.com Wed Mar 28 00:36:26 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3C3521F8793 for ; Wed, 28 Mar 2012 00:36:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.153 X-Spam-Level: X-Spam-Status: No, score=-9.153 tagged_above=-999 required=5 tests=[AWL=1.446, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A2px3ghQAIid for ; Wed, 28 Mar 2012 00:36:26 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id CA73221F8790 for ; Wed, 28 Mar 2012 00:36:25 -0700 (PDT) Received: from usnavsmail3.ndc.alcatel-lucent.com (usnavsmail3.ndc.alcatel-lucent.com [135.3.39.11]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id q2S7aLxv001726 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 28 Mar 2012 02:36:23 -0500 (CDT) Received: from USNAVSXCHHUB03.ndc.alcatel-lucent.com (usnavsxchhub03.ndc.alcatel-lucent.com [135.3.39.112]) by usnavsmail3.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2S7aINF024665 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Wed, 28 Mar 2012 02:36:18 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB03.ndc.alcatel-lucent.com ([135.3.39.112]) with mapi; Wed, 28 Mar 2012 02:36:18 -0500 From: "Hampel, K Georg (K Georg)" To: "Olivier.Bonaventure@uclouvain.be" Date: Wed, 28 Mar 2012 02:36:14 -0500 Thread-Topic: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Thread-Index: Ac0MUYLufFsWALOJRjuUQEK3csVAhwAX5utA Message-ID: <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> In-Reply-To: <4F7217B7.5030005@uclouvain.be> 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 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.11 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 07:36:26 -0000 Olivier, I know that the present implementation already supports mobility. But that = doesn't diminish my points. What I am aiming for is middle-box-compliant mo= bility at low cost. I have inserted comments. Thanks. Georg -----Original Message----- From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be]=20 Sent: Tuesday, March 27, 2012 9:41 PM To: Hampel, K Georg (K Georg) Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi Nishida Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Georg, >=20 > I'm proposing to add MOBILITY to MPTCP's revised charter, for the > following reasons: >=20 > =20 >=20 > 1) Strong use case: >=20 > MPTCP allows 3G/4G mobility operators to dynamically offload traffic > from their air interface to unlicensed spectrum. When deployed as > end-to-end solution, it also permits dynamically offloading the 3G/4G > core. Together with MPTCP's middlebox compliance, there is no other > solution that offers such features. >=20 This already works with the current specification. We have an implementation that is already able to perfom WiFi/3G offload and we are performing measurements in real networks. We already have some experience to prepare a report describing how MPTCP can be used in mobile environments. If the WG thinks that such a report would be useful, we can prepare a first draft. Based on our previous work, we also have some ideas on the datacenter usecase for MPTCP and could also contribute to an applicability draft in this domain. [GH] That's all fine, but it doesn't affect the validity of point 1).=20 > 2) Implementation sweet spot: >=20 > MPTCP-mobility can be realized via simple implementation below transport > layer while being fully interoperable with full-blown MPTCP. Using the > same implementation, proxy operation can be conducted in a very > resource-efficient manner. This makes MPTCP rollout fast and proxy > operation low-cost. The main benefit of MPTCP compared to network layer solutions is that the congestion control scheme is aware of the path changes and can react appropriately. I'm not sure I completely understand the benefits and limitations of your proposed simple implementation. [GH] I presented the concept in Quebec City. I can show trial results from = an implementation. We can discuss benefits and limitations at any time. We = can also work this as part of a new charter. An important point for the acceptance of MPTCP will be interoperability reports from at least two different implementations. Our implementation is now almost completely compliant. We'd be happy to perform interoperability tests with any other implementation. [GH] We have just started interoperability tests with Christoph's code. Int= eroperability, indeed, is very important. > 3) Buzz: >=20 > There is a large group of people, e.g. mobile operators, interested to > find a solution to the above use case and they NEVER think of MPTCP > unless it gets the term "MOBILITY" explicitly spelled out in its charter! Mobile network operators willing to see a demonstration of MPTCP in a mobile Wifi/3G offload scenario can contact us offline... [GH] ...if they realize that MPTCP offers a "mobility solution for traffic = offload". Mobility-seeking people don't trigger when you say "multipath". I= don't understand why you want to miss out on this opportunity. Olivier --=20 INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From mglt.ietf@gmail.com Wed Mar 28 01:58:22 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A8F0421F890D for ; Wed, 28 Mar 2012 01:58:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.978 X-Spam-Level: X-Spam-Status: No, score=-2.978 tagged_above=-999 required=5 tests=[AWL=-0.620, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, SARE_LWSHORTT=1.24] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FkH1OhH2AOfe for ; Wed, 28 Mar 2012 01:58:21 -0700 (PDT) Received: from mail-iy0-f172.google.com (mail-iy0-f172.google.com [209.85.210.172]) by ietfa.amsl.com (Postfix) with ESMTP id 4274521F8909 for ; Wed, 28 Mar 2012 01:58:21 -0700 (PDT) Received: by iazz13 with SMTP id z13so1352511iaz.31 for ; Wed, 28 Mar 2012 01:58:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=sXToX1SGqIzSm3hKZ7MnMT6/rAzrYEIPw3uUCyD38sw=; b=b6op6biC7OHBPV2sg/DHTDQctiY4pKykrK81n1ElJEO02C5RZkePwh47mU2dbc0pyY KCbhVriSJP+keivVZUmSZVit9dc71Ex0o0xKEGgeACaFvZzVDl0CilWU0GWBRUB0egkM VWXHlQT6p3yyvj8tLzuUKPJlMpivkR/HT/iH95osuCPmGIPTBlqcBoxgPDGc+9yv8JmF 7II75i+wTpn7Ux85CVm2/lcs3vqPO8GoOei7qqECnh3gkFjMgNLZNFE0B7BEdyvat+/+ eBcr76hfeDHW9OsP8o0MU0wgcXQN/tiJg55HMW0guA0L2FhnUe9p+vwQXLtuvDGLMLsj 3fxQ== MIME-Version: 1.0 Received: by 10.42.141.131 with SMTP id o3mr17177830icu.1.1332925100873; Wed, 28 Mar 2012 01:58:20 -0700 (PDT) Received: by 10.231.170.138 with HTTP; Wed, 28 Mar 2012 01:58:20 -0700 (PDT) In-Reply-To: <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> Date: Wed, 28 Mar 2012 10:58:20 +0200 Message-ID: From: Daniel Migault To: "Hampel, K Georg (K Georg)" Content-Type: multipart/alternative; boundary=90e6ba6e833c26568304bc49cfb1 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 08:58:22 -0000 --90e6ba6e833c26568304bc49cfb1 Content-Type: text/plain; charset=ISO-8859-1 Hi, Offload is currently a VERY HOT topic for ISPs, but ISPs HARDLY know MPTCP (I know a lot more about it then I do about MPTCP). Thus I would favor any titles document that are offload-centric. This would provide MPTCP the necessary visibility, and MPTCP is of interest for ISPs in an offload context. MIP/MOBIKE is probably a target for offload. However, in the short term, some ISPs will probably not deploy MIP architecture nor deploy a complete Security Gateway architecture ready to deal with all the EU traffic. Consequently, in the short term such ISPs are looking for solution where Mobility Multihoming and Multiple Interfaces Management is handled by the EU, not the CORE Network. Without an infrastructure that deals with all traffic in a single manner, Mobility Multihoming and Multiple Interface Management will be handled on a per application basis. This can be done at the application layer, but in some case, there are some interests to do that at the transport layer. I worked with SCTP but MPTCP seems a lot better. Aside from MPTCP features we have to also evaluate how migration from TCP applications to MPTCP can be done, the easiest the better -- even if not all features are available. Does MPTCP overhead for a single connection affects traditional TCP users.... The important thing is that I feel ISPs are considering adapting some of their applications to adapt them to an offload context, and that 's a real opportunity. Best Regards, Daniel On Wed, Mar 28, 2012 at 9:36 AM, Hampel, K Georg (K Georg) < georg.hampel@alcatel-lucent.com> wrote: > Olivier, > > I know that the present implementation already supports mobility. But that > doesn't diminish my points. What I am aiming for is middle-box-compliant > mobility at low cost. > > I have inserted comments. Thanks. > > > Georg > > -----Original Message----- > From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be] > Sent: Tuesday, March 27, 2012 9:41 PM > To: Hampel, K Georg (K Georg) > Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi Nishida > Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY > > Georg, > > > > I'm proposing to add MOBILITY to MPTCP's revised charter, for the > > following reasons: > > > > > > > > 1) Strong use case: > > > > MPTCP allows 3G/4G mobility operators to dynamically offload traffic > > from their air interface to unlicensed spectrum. When deployed as > > end-to-end solution, it also permits dynamically offloading the 3G/4G > > core. Together with MPTCP's middlebox compliance, there is no other > > solution that offers such features. > > > > This already works with the current specification. We have an > implementation that is already able to perfom WiFi/3G offload and we are > performing measurements in real networks. > > We already have some experience to prepare a report describing how MPTCP > can be used in mobile > environments. If the WG thinks that such a report would be useful, we > can prepare a first draft. > > Based on our previous work, we also have some ideas on the datacenter > usecase for MPTCP and could also contribute to an applicability draft in > this domain. > > [GH] That's all fine, but it doesn't affect the validity of point 1). > > > > 2) Implementation sweet spot: > > > > MPTCP-mobility can be realized via simple implementation below transport > > layer while being fully interoperable with full-blown MPTCP. Using the > > same implementation, proxy operation can be conducted in a very > > resource-efficient manner. This makes MPTCP rollout fast and proxy > > operation low-cost. > > The main benefit of MPTCP compared to network layer solutions is that > the congestion control scheme is aware of the path changes and can react > appropriately. I'm not sure I completely understand the benefits and > limitations of your proposed simple implementation. > > [GH] I presented the concept in Quebec City. I can show trial results from > an implementation. We can discuss benefits and limitations at any time. We > can also work this as part of a new charter. > > > An important point for the acceptance of MPTCP will be interoperability > reports from at least two different implementations. Our implementation > is now almost completely compliant. We'd be happy to perform > interoperability tests with any other implementation. > > [GH] We have just started interoperability tests with Christoph's code. > Interoperability, indeed, is very important. > > > > 3) Buzz: > > > > There is a large group of people, e.g. mobile operators, interested to > > find a solution to the above use case and they NEVER think of MPTCP > > unless it gets the term "MOBILITY" explicitly spelled out in its charter! > > Mobile network operators willing to see a demonstration of MPTCP in a > mobile Wifi/3G offload scenario can contact us offline... > > [GH] ...if they realize that MPTCP offers a "mobility solution for traffic > offload". Mobility-seeking people don't trigger when you say "multipath". I > don't understand why you want to miss out on this opportunity. > > > > Olivier > > -- > INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp > -- Daniel Migault Orange Labs -- Security +33 6 70 72 69 58 --90e6ba6e833c26568304bc49cfb1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi,

Offload is currently a VERY HOT topic for ISPs, but ISPs HARDLY= know MPTCP (I know a lot more about it then I do about MPTCP). Thus I woul= d favor any titles document that are offload-centric. This would provide MP= TCP the necessary visibility, and MPTCP is of interest for ISPs in an offlo= ad context.

MIP/MOBIKE is probably a target for offload. However, in the short term= , some ISPs will probably not deploy MIP architecture nor deploy a complete= Security Gateway architecture ready to deal with all the EU traffic. Conse= quently, in the short term such ISPs are looking for solution where Mobilit= y Multihoming and Multiple Interfaces Management is handled by the EU, not = the CORE Network.

Without an infrastructure that deals with all traffic in a single manne= r, Mobility Multihoming and Multiple Interface Management will be handled o= n a per application basis. This can be done at the application layer, but i= n some case, there are some interests to do that at the transport layer.
I worked with SCTP but MPTCP seems a lot better. Aside from MPTCP featu= res we have to also evaluate how migration from TCP applications to MPTCP c= an be done, the easiest the better -- even if not all features are availabl= e. Does MPTCP overhead for a single connection affects traditional TCP user= s....=A0

The important thing is that I feel ISPs are considering adapting some o= f their applications to adapt them to an offload context, and that 's a= real opportunity.

Best Regards,
Daniel

On Wed, Mar 28, 2012 at 9:36 AM, Hampel, K Georg (K Georg) <georg.hampel@alcat= el-lucent.com> wrote:
Olivier,

I know that the present implementation already supports mobility. But that = doesn't diminish my points. What I am aiming for is middle-box-complian= t mobility at low cost.

I have inserted comments. Thanks.


Georg

-----Original Message-----
From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be]
Sent: Tuesday, March 27, 2012 9:41 PM
To: Hampel, K Georg (K Georg)
Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi = Nishida
Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY
Georg,
>
> I'm proposing to add MOBILITY to MPTCP's revised charter, for = the
> following reasons:
>
>
>
> 1) =A0 =A0 =A0 Strong use case:
>
> MPTCP allows 3G/4G mobility operators to dynamically offload traffic > from their air interface to unlicensed spectrum. When deployed as
> end-to-end solution, it also permits dynamically offloading the 3G/4G<= br> > core. Together with MPTCP's middlebox compliance, there is no othe= r
> solution that offers such features.
>

This already works with the current specification. We have an
implementation that is already able to perfom WiFi/3G offload and we are performing measurements in real networks.

We already have some experience to prepare a report describing how MPTCP can be used in mobile
environments. If the WG thinks that such a report would be useful, we
can prepare a first draft.

Based on our previous work, we also have some ideas on the datacenter
usecase for MPTCP and could also contribute to an applicability draft in this domain.

[GH] That's all fine, but it doesn't affect the validit= y of point 1).


> 2) =A0 =A0 =A0 Implementation sweet spot:
>
> MPTCP-mobility can be realized via simple implementation below transpo= rt
> layer while being fully interoperable with full-blown MPTCP. Using the=
> same implementation, proxy operation can be conducted in a very
> resource-efficient manner. This makes MPTCP rollout fast and proxy
> operation low-cost.

The main benefit of MPTCP compared to network layer solutions is that
the congestion control scheme is aware of the path changes and can react appropriately. I'm not sure I completely understand the benefits and limitations of your proposed simple implementation.

[GH] I presented the concept in Quebec City. I can show trial results= from an implementation. We can discuss benefits and limitations at any tim= e. We can also work this as part of a new charter.


An important point for the acceptance of MPTCP will be interoperability
reports from at least two different implementations. Our implementation
is now almost completely compliant. We'd be happy to perform
interoperability tests with any other implementation.

[GH] We have just started interoperability tests with Christoph's= code. Interoperability, indeed, is very important.


> 3) =A0 Buzz:
>
> There is a large group of people, e.g. mobile operators, interested to=
> find a solution to the above use case and they NEVER think of MPTCP > unless it gets the term "MOBILITY" explicitly spelled out in= its charter!

Mobile network operators willing to see a demonstration of MPTCP in a
mobile Wifi/3G offload scenario can contact us offline...

[GH] ...if they realize that MPTCP offers a "mobility solution f= or traffic offload". Mobility-seeking people don't trigger when yo= u say "multipath". I don't understand why you want to miss ou= t on this opportunity.



Olivier

--
INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be
_______________________________________________
multipathtcp mailing list
multipathtcp@ietf.org
https://www.ietf.org/mailman/listinfo/multipathtcp



--
Daniel Miga= ult
Orange Labs -- Security
+33 6 70 72 69 58
--90e6ba6e833c26568304bc49cfb1-- From philip.eardley@bt.com Wed Mar 28 02:21:22 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9CD6F21E8139 for ; Wed, 28 Mar 2012 02:21:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.831 X-Spam-Level: X-Spam-Status: No, score=-102.831 tagged_above=-999 required=5 tests=[AWL=-0.473, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, SARE_LWSHORTT=1.24, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MsdSuCncMuhE for ; Wed, 28 Mar 2012 02:21:20 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp61.intersmtp.com [62.239.224.234]) by ietfa.amsl.com (Postfix) with ESMTP id 28A4921E8117 for ; Wed, 28 Mar 2012 02:21:20 -0700 (PDT) Received: from EVMHT66-UKRD.domain1.systemhost.net (10.36.3.103) by RDW083A005ED61.smtp-e1.hygiene.service (10.187.98.10) with Microsoft SMTP Server (TLS) id 8.3.213.0; Wed, 28 Mar 2012 10:21:16 +0100 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.102]) by EVMHT66-UKRD.domain1.systemhost.net ([10.36.3.103]) with mapi; Wed, 28 Mar 2012 10:21:16 +0100 From: To: , Date: Wed, 28 Mar 2012 10:21:16 +0100 Thread-Topic: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Thread-Index: Ac0MwPDuv5uB+CjtTMGKBXII5H3pxQAATZER Message-ID: <9510D26531EF184D9017DF24659BB87F331DE0C427@EMV65-UKRD.domain1.systemhost.net> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com>, In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F331DE0C427EMV65UKRDdoma_" MIME-Version: 1.0 Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 09:21:23 -0000 --_000_9510D26531EF184D9017DF24659BB87F331DE0C427EMV65UKRDdoma_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Daniel - thanks for your input on a good use case, this is very useful. just wanted to make sure I understand this right >>The important thing is that I feel ISPs are considering adapting some of = their applications to adapt them to an offload context, and that 's a real = opportunity. By ISP, are you just referring to mobile ISP, and offload means using WiFi = rather than 3/4G? by default, MPTCP uses the same API as TCP, ie it is hidden from the applic= ation. we also defined a 'basic mptcp api' that allows mptcp-aware apps to = get some mptcp info. we have talked about doing an advanced mptcp api with = more complex capability - the api draft gives a few ideas. currently no-one= has said they think the re-charter should work on specifying the advanced = api. mptcp's congestion control is friendly to ordinary tcp (ie it doesn't outco= mpete where mptcp's multiple paths happen to all go through the same link t= hat is also a bottleneck for a [single path] tcp) we will be having re-chartering discussion on friday - so it is very releva= nt to talk about where we need to develop extra functionality, and/or where= we need Info doc that explains how to use the currently specified capabili= ty in specific use cases that are of particular interest. api doc is http://datatracker.ietf.org/doc/draft-ietf-mptcp-api/ (status: c= ompleted WGLC, about to go to IESG) ________________________________ From: multipathtcp-bounces@ietf.org [multipathtcp-bounces@ietf.org] On Beha= lf Of Daniel Migault [mglt.ietf@gmail.com] Sent: 28 March 2012 09:58 To: Hampel, K Georg (K Georg) Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Hi, Offload is currently a VERY HOT topic for ISPs, but ISPs HARDLY know MPTCP = (I know a lot more about it then I do about MPTCP). Thus I would favor any = titles document that are offload-centric. This would provide MPTCP the nece= ssary visibility, and MPTCP is of interest for ISPs in an offload context. MIP/MOBIKE is probably a target for offload. However, in the short term, so= me ISPs will probably not deploy MIP architecture nor deploy a complete Sec= urity Gateway architecture ready to deal with all the EU traffic. Consequen= tly, in the short term such ISPs are looking for solution where Mobility Mu= ltihoming and Multiple Interfaces Management is handled by the EU, not the = CORE Network. Without an infrastructure that deals with all traffic in a single manner, M= obility Multihoming and Multiple Interface Management will be handled on a = per application basis. This can be done at the application layer, but in so= me case, there are some interests to do that at the transport layer. I worked with SCTP but MPTCP seems a lot better. Aside from MPTCP features = we have to also evaluate how migration from TCP applications to MPTCP can b= e done, the easiest the better -- even if not all features are available. D= oes MPTCP overhead for a single connection affects traditional TCP users...= . The important thing is that I feel ISPs are considering adapting some of th= eir applications to adapt them to an offload context, and that 's a real op= portunity. Best Regards, Daniel On Wed, Mar 28, 2012 at 9:36 AM, Hampel, K Georg (K Georg) > wrote: Olivier, I know that the present implementation already supports mobility. But that = doesn't diminish my points. What I am aiming for is middle-box-compliant mo= bility at low cost. I have inserted comments. Thanks. Georg -----Original Message----- From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be] Sent: Tuesday, March 27, 2012 9:41 PM To: Hampel, K Georg (K Georg) Cc: multipathtcp@ietf.org; philip.eardley@bt.= com; Yoshifumi Nishida Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Georg, > > I'm proposing to add MOBILITY to MPTCP's revised charter, for the > following reasons: > > > > 1) Strong use case: > > MPTCP allows 3G/4G mobility operators to dynamically offload traffic > from their air interface to unlicensed spectrum. When deployed as > end-to-end solution, it also permits dynamically offloading the 3G/4G > core. Together with MPTCP's middlebox compliance, there is no other > solution that offers such features. > This already works with the current specification. We have an implementation that is already able to perfom WiFi/3G offload and we are performing measurements in real networks. We already have some experience to prepare a report describing how MPTCP can be used in mobile environments. If the WG thinks that such a report would be useful, we can prepare a first draft. Based on our previous work, we also have some ideas on the datacenter usecase for MPTCP and could also contribute to an applicability draft in this domain. [GH] That's all fine, but it doesn't affect the validity of point 1). > 2) Implementation sweet spot: > > MPTCP-mobility can be realized via simple implementation below transport > layer while being fully interoperable with full-blown MPTCP. Using the > same implementation, proxy operation can be conducted in a very > resource-efficient manner. This makes MPTCP rollout fast and proxy > operation low-cost. The main benefit of MPTCP compared to network layer solutions is that the congestion control scheme is aware of the path changes and can react appropriately. I'm not sure I completely understand the benefits and limitations of your proposed simple implementation. [GH] I presented the concept in Quebec City. I can show trial results from = an implementation. We can discuss benefits and limitations at any time. We = can also work this as part of a new charter. An important point for the acceptance of MPTCP will be interoperability reports from at least two different implementations. Our implementation is now almost completely compliant. We'd be happy to perform interoperability tests with any other implementation. [GH] We have just started interoperability tests with Christoph's code. Int= eroperability, indeed, is very important. > 3) Buzz: > > There is a large group of people, e.g. mobile operators, interested to > find a solution to the above use case and they NEVER think of MPTCP > unless it gets the term "MOBILITY" explicitly spelled out in its charter! Mobile network operators willing to see a demonstration of MPTCP in a mobile Wifi/3G offload scenario can contact us offline... [GH] ...if they realize that MPTCP offers a "mobility solution for traffic = offload". Mobility-seeking people don't trigger when you say "multipath". I= don't understand why you want to miss out on this opportunity. Olivier -- INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be _______________________________________________ multipathtcp mailing list multipathtcp@ietf.org https://www.ietf.org/mailman/listinfo/multipathtcp -- Daniel Migault Orange Labs -- Security +33 6 70 72 69 58 --_000_9510D26531EF184D9017DF24659BB87F331DE0C427EMV65UKRDdoma_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Daniel -
thanks for your input on a good use case, this i= s very useful.
 
just wanted to make sure I understand this right=
>>The important thing is that I feel ISPs are considering adapti= ng some of their applications to adapt them to an offload context, and that= 's a real opportunity.
By ISP, are you just referring to mobile ISP, and offload means using WiFi = rather than 3/4G?
 
by default, MPTCP uses the same API as TCP, ie i= t is hidden from the application. we also defined a 'basic mptcp api' that = allows mptcp-aware apps to get some mptcp info. we have talked about doing = an advanced mptcp api with more complex capability - the api draft gives a few ideas. currently no-one has said th= ey think the re-charter should work on specifying the advanced api.
 
mptcp's congestion control is friendly to ordina= ry tcp (ie it doesn't outcompete where mptcp's multiple paths happen to all= go through the same link that is also a bottleneck for a [single path] tcp= )
 
we will be having re-chartering discussion on fr= iday - so it is very relevant to talk about where we need to develop extra = functionality, and/or where we need Info doc that explains how to use the c= urrently specified capability in specific use cases that are of particular interest.
 
api doc is http://datatracker.ietf.org/doc/draft-ietf-mptcp-api/ (status: com= pleted WGLC, about to go to IESG)
=  
From: multipathtc= p-bounces@ietf.org [multipathtcp-bounces@ietf.org] On Behalf Of Daniel Miga= ult [mglt.ietf@gmail.com]
Sent: 28 March 2012 09:58
To: Hampel, K Georg (K Georg)
Cc: multipathtcp@ietf.org
Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBI= LITY

Hi,

Offload is currently a VERY HOT topic for ISPs, but ISPs HARDLY know MPTCP = (I know a lot more about it then I do about MPTCP). Thus I would favor any = titles document that are offload-centric. This would provide MPTCP the nece= ssary visibility, and MPTCP is of interest for ISPs in an offload context.

MIP/MOBIKE is probably a target for offload. However, in the short term, so= me ISPs will probably not deploy MIP architecture nor deploy a complete Sec= urity Gateway architecture ready to deal with all the EU traffic. Consequen= tly, in the short term such ISPs are looking for solution where Mobility Multihoming and Multiple Interface= s Management is handled by the EU, not the CORE Network.

Without an infrastructure that deals with all traffic in a single manner, M= obility Multihoming and Multiple Interface Management will be handled on a = per application basis. This can be done at the application layer, but in so= me case, there are some interests to do that at the transport layer.

I worked with SCTP but MPTCP seems a lot better. Aside from MPTCP features = we have to also evaluate how migration from TCP applications to MPTCP can b= e done, the easiest the better -- even if not all features are available. D= oes MPTCP overhead for a single connection affects traditional TCP users.... 

The important thing is that I feel ISPs are considering adapting some of th= eir applications to adapt them to an offload context, and that 's a real op= portunity.

Best Regards,
Daniel

On Wed, Mar 28, 2012 at 9:36 AM, Hampel, K Georg= (K Georg) <ge= org.hampel@alcatel-lucent.com> wrote:
Olivier,

I know that the present implementation already supports mobility. But that = doesn't diminish my points. What I am aiming for is middle-box-compliant mo= bility at low cost.

I have inserted comments. Thanks.


Georg

-----Original Message-----
From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be]
Sent: Tuesday, March 27, 2012 9:41 PM
To: Hampel, K Georg (K Georg)
Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi Nishida
Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY
Georg,
>
> I'm proposing to add MOBILITY to MPTCP's revised charter, for the
> following reasons:
>
>
>
> 1)       Strong use case:
>
> MPTCP allows 3G/4G mobility operators to dynamically offload traffic > from their air interface to unlicensed spectrum. When deployed as
> end-to-end solution, it also permits dynamically offloading the 3G/4G<= br> > core. Together with MPTCP's middlebox compliance, there is no other > solution that offers such features.
>

This already works with the current specification. We have an
implementation that is already able to perfom WiFi/3G offload and we are performing measurements in real networks.

We already have some experience to prepare a report describing how MPTCP can be used in mobile
environments. If the WG thinks that such a report would be useful, we
can prepare a first draft.

Based on our previous work, we also have some ideas on the datacenter
usecase for MPTCP and could also contribute to an applicability draft in this domain.

[GH] That's all fine, but it doesn't affect the validity of point 1).


> 2)       Implementation sweet spot:
>
> MPTCP-mobility can be realized via simple implementation below transpo= rt
> layer while being fully interoperable with full-blown MPTCP. Using the=
> same implementation, proxy operation can be conducted in a very
> resource-efficient manner. This makes MPTCP rollout fast and proxy
> operation low-cost.

The main benefit of MPTCP compared to network layer solutions is that
the congestion control scheme is aware of the path changes and can react appropriately. I'm not sure I completely understand the benefits and
limitations of your proposed simple implementation.

[GH] I presented the concept in Quebec City. I can show trial results from = an implementation. We can discuss benefits and limitations at any time. We = can also work this as part of a new charter.


An important point for the acceptance of MPTCP will be interoperability
reports from at least two different implementations. Our implementation
is now almost completely compliant. We'd be happy to perform
interoperability tests with any other implementation.

[GH] We have just started interoperability tests with Christoph's code. Int= eroperability, indeed, is very important.


> 3)   Buzz:
>
> There is a large group of people, e.g. mobile operators, interested to=
> find a solution to the above use case and they NEVER think of MPTCP > unless it gets the term "MOBILITY" explicitly spelled out in= its charter!

Mobile network operators willing to see a demonstration of MPTCP in a
mobile Wifi/3G offload scenario can contact us offline...

[GH] ...if they realize that MPTCP offers a "mobility solution for tra= ffic offload". Mobility-seeking people don't trigger when you say &quo= t;multipath". I don't understand why you want to miss out on this oppo= rtunity.



Olivier

--
INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be
_______________________________________________
multipathtcp mailing list
multipathtcp@ietf.org
https://www.ietf.org/mailman/listinfo/multipathtcp



--
Daniel Migault
Orange Labs -- Security
+33 6 70 72 69 58
--_000_9510D26531EF184D9017DF24659BB87F331DE0C427EMV65UKRDdoma_-- From olivier.bonaventure@uclouvain.be Wed Mar 28 02:46:20 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 595C321F89BC for ; Wed, 28 Mar 2012 02:46:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xN1Ei7LkrGFW for ; Wed, 28 Mar 2012 02:46:19 -0700 (PDT) Received: from smtp6.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id 5839121F89BB for ; Wed, 28 Mar 2012 02:46:19 -0700 (PDT) Received: from mbpobo.dhcp.info.ucl.ac.be (haproxy2.sipr.ucl.ac.be [130.104.5.120]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: obonaventure@smtp6.sgsi.ucl.ac.be) by smtp6.sgsi.ucl.ac.be (Postfix) with ESMTPSA id 6E6031C5DB1; Wed, 28 Mar 2012 11:46:12 +0200 (CEST) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp6.sgsi.ucl.ac.be 6E6031C5DB1 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1332927972; bh=boED6y57SF4nOKApA7P/zxYWYKXqSq8f1CQe2JSwNQE=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=nK55+vWplJMtA+/rKwiQVXGzIdmUY1Os1auyaChBHOAFPmkyUxrDPWbuTRp3g5+a5 95lb5Yp0B9tg6UXpENY8x3pLotfmK1LVl1K+6c18sgGI6z2WmO4MMSIa6hpwx4omTF iTrs11zRUexdNRQaPuheK0mFU1en2y3FfHCxYugE= Message-ID: <4F72DDE3.8040209@uclouvain.be> Date: Wed, 28 Mar 2012 11:46:11 +0200 From: Olivier Bonaventure User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120313 Thunderbird/11.0 MIME-Version: 1.0 To: "Hampel, K Georg (K Georg)" References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.97.3-exp at smtp-6.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: 6E6031C5DB1.A4B89 X-SGSI-MailScanner: Found to be clean X-SGSI-From: olivier.bonaventure@uclouvain.be X-SGSI-Spam-Status: No Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: Olivier.Bonaventure@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 09:46:20 -0000 Georg, >> 1) Strong use case: >> >> MPTCP allows 3G/4G mobility operators to dynamically offload traffic >> from their air interface to unlicensed spectrum. When deployed as >> end-to-end solution, it also permits dynamically offloading the 3G/4G >> core. Together with MPTCP's middlebox compliance, there is no other >> solution that offers such features. >> > > This already works with the current specification. We have an > implementation that is already able to perfom WiFi/3G offload and we are > performing measurements in real networks. > > We already have some experience to prepare a report describing how MPTCP > can be used in mobile > environments. If the WG thinks that such a report would be useful, we > can prepare a first draft. > > Based on our previous work, we also have some ideas on the datacenter > usecase for MPTCP and could also contribute to an applicability draft in > this domain. > > [GH] That's all fine, but it doesn't affect the validity of point 1). We should document use cases of MPTCP. We are ready to contribute by preparing a draft on : - mptcp use case for mobile offload - mptcp use case for datacenters MPTCP could also play a role in the IPv4/IPv6 transition and we would be ready to contribute to a draft to discuss this use case as well. >> >> There is a large group of people, e.g. mobile operators, interested to >> find a solution to the above use case and they NEVER think of MPTCP >> unless it gets the term "MOBILITY" explicitly spelled out in its charter! > > Mobile network operators willing to see a demonstration of MPTCP in a > mobile Wifi/3G offload scenario can contact us offline... > > [GH] ...if they realize that MPTCP offers a "mobility solution for traffic offload". Mobility-seeking people don't trigger when you say "multipath". I don't understand why you want to miss out on this opportunity. I agreed that MPTCP can play a role in this domain and we should probably improve the marketing of MPTCP. Documenting use cases would be a good way to improve the visibility within the IETF, but not all operators follow IETF. Concerning the charter, we should not limit ourselves to the mobile environment. MPTCP has the same use cases as TCP and thus has broad applicability. Olivier -- INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From olivier.bonaventure@uclouvain.be Wed Mar 28 02:50:35 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE3C721F8733 for ; Wed, 28 Mar 2012 02:50:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CeiBgR8D984P for ; Wed, 28 Mar 2012 02:50:35 -0700 (PDT) Received: from smtp5.sgsi.ucl.ac.be (smtp.sgsi.ucl.ac.be [130.104.5.67]) by ietfa.amsl.com (Postfix) with ESMTP id 1B89621F86B7 for ; Wed, 28 Mar 2012 02:50:34 -0700 (PDT) Received: from mbpobo.dhcp.info.ucl.ac.be (haproxy2.sipr.ucl.ac.be [130.104.5.120]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: obonaventure@smtp5.sgsi.ucl.ac.be) by smtp5.sgsi.ucl.ac.be (Postfix) with ESMTPSA id 62B3D11E9D3; Wed, 28 Mar 2012 11:50:21 +0200 (CEST) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp5.sgsi.ucl.ac.be 62B3D11E9D3 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=uclouvain.be; s=selucl; t=1332928221; bh=EwMY5JqlxMbaG30QgGsOUc9yvn3Povh3WAxwpJ3m8aw=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=bIMwkslfFRRPkTLjNigNk8c1MTMwY8hFpPz/EIGBGkz1FT6X0kMK10T65aYGPE5uh TYpzWsqzeDv7rJSkLoxHCX1xV3uXsEeJTvjFXLlyCvmgic/FVNSkqjq0Cku9PT6pC2 gIhso59LwH1mW6KSzMtlXspO1InkoJi+AzGgY7TM= Message-ID: <4F72DEDC.6020708@uclouvain.be> Date: Wed, 28 Mar 2012 11:50:20 +0200 From: Olivier Bonaventure User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120313 Thunderbird/11.0 MIME-Version: 1.0 To: Daniel Migault References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.97.3-exp at smtp-5.sipr-dc.ucl.ac.be X-Virus-Status: Clean X-Sgsi-Spamcheck: SASL authenticated, X-SGSI-MailScanner-ID: 62B3D11E9D3.A2194 X-SGSI-MailScanner: Found to be clean X-SGSI-From: olivier.bonaventure@uclouvain.be X-SGSI-Spam-Status: No Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: Olivier.Bonaventure@uclouvain.be List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 09:50:36 -0000 Daniel, > > I worked with SCTP but MPTCP seems a lot better. Aside from MPTCP > features we have to also evaluate how migration from TCP applications to > MPTCP can be done, the easiest the better -- even if not all features > are available. Does MPTCP overhead for a single connection affects > traditional TCP users.... MPTCP does not require any change to the socket API. MPTCP already works with existing applications provided of course that MPTCP is included in the operating system. For example, on a host where UDP is completely blocked by the firewall, skype works perfectly above our MPTCP implementation in the Linux kernel. Video and voice calls work correctly even when MPTCP is using both 3G and WiFi or when there is a handover from 3G to WiFi. The same is true for any socket-based application. Olivier -- INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From scott.brim@gmail.com Wed Mar 28 02:58:51 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E92521F89FD for ; Wed, 28 Mar 2012 02:58:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -103.576 X-Spam-Level: X-Spam-Status: No, score=-103.576 tagged_above=-999 required=5 tests=[AWL=0.023, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dXaV3vsNwISe for ; Wed, 28 Mar 2012 02:58:50 -0700 (PDT) Received: from mail-bk0-f44.google.com (mail-bk0-f44.google.com [209.85.214.44]) by ietfa.amsl.com (Postfix) with ESMTP id 6F40021F89F9 for ; Wed, 28 Mar 2012 02:58:49 -0700 (PDT) Received: by bkuw5 with SMTP id w5so789803bku.31 for ; Wed, 28 Mar 2012 02:58:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; bh=9lBBljK+e3MKzOiunxjHerKPkQt3bj41ygEjpWNOJSM=; b=0ucvNMdNzhaB/FbqYhHyjZINTABv3xwRpMmdADa5cheglb3ksnaVEyftsl8Yu0+RKG 6PZ/cLoqwyDr+BIncrlg6CRmhbuE9KtSeB8CjYI8b8yPowMoKOfC1q43/dqH4Imic2Iu T4J0POIG7dirOrzEPvuyMjbTKpeqC4duV/qfHWKBHmKqr8GlfXpH//pyTmX/oCBY8eHX nLWulmVrwxjW2FQX0Gy4ZedWIroOSvhcdHEN0d4Z/gfREviGDiJYdoK4B3dYA5Cwd/5l mg7KSR5uZGM23bNF2QHSG+KcliqwJt5WbASAilXVIcapgv22IaZDdpgC3AWlaJWEPLGk mQug== Received: by 10.205.132.73 with SMTP id ht9mr11989823bkc.46.1332928728509; Wed, 28 Mar 2012 02:58:48 -0700 (PDT) Received: from dhcp-908f.meeting.ietf.org ([2001:df8:0:8:129a:ddff:fec0:1627]) by mx.google.com with ESMTPS id u14sm5323522bkp.2.2012.03.28.02.58.46 (version=SSLv3 cipher=OTHER); Wed, 28 Mar 2012 02:58:47 -0700 (PDT) Message-ID: <4F72E0D4.7000205@gmail.com> Date: Wed, 28 Mar 2012 11:58:44 +0200 From: Scott Brim User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120313 Thunderbird/11.0 MIME-Version: 1.0 To: Daniel Migault References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 09:58:51 -0000 On 03/28/12 10:58, Daniel Migault allegedly wrote: > I worked with SCTP but MPTCP seems a lot better. !! :-) > The important thing is that I feel ISPs are considering adapting some of > their applications to adapt them to an offload context, and that 's a > real opportunity. I agree. However, I believe that this is already covered by the charter and has been an expected use case since the first MPTCP presentation to the RRG. FYI, a few IETFs ago when MPTCP proxies were first brought up, I suggested that the control protocol for using them should be the same as for MIP HAs in order to provide an evolutionary path (... and Randy Stewart let us know that he had the same thing for SCTP back in 2001). Scott From georg.hampel@alcatel-lucent.com Wed Mar 28 04:44:35 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BAAA121F896E for ; Wed, 28 Mar 2012 04:44:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.274 X-Spam-Level: X-Spam-Status: No, score=-9.274 tagged_above=-999 required=5 tests=[AWL=1.325, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id J44ICZyeoLQ6 for ; Wed, 28 Mar 2012 04:44:34 -0700 (PDT) Received: from ihemail1.lucent.com (ihemail1.lucent.com [135.245.0.33]) by ietfa.amsl.com (Postfix) with ESMTP id B61A521F8961 for ; Wed, 28 Mar 2012 04:44:34 -0700 (PDT) Received: from usnavsmail1.ndc.alcatel-lucent.com (usnavsmail1.ndc.alcatel-lucent.com [135.3.39.9]) by ihemail1.lucent.com (8.13.8/IER-o) with ESMTP id q2SBiUwE019785 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 28 Mar 2012 06:44:31 -0500 (CDT) Received: from USNAVSXCHHUB01.ndc.alcatel-lucent.com (usnavsxchhub01.ndc.alcatel-lucent.com [135.3.39.110]) by usnavsmail1.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2SBiNwI026094 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Wed, 28 Mar 2012 06:44:23 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB01.ndc.alcatel-lucent.com ([135.3.39.110]) with mapi; Wed, 28 Mar 2012 06:44:23 -0500 From: "Hampel, K Georg (K Georg)" To: "Olivier.Bonaventure@uclouvain.be" Date: Wed, 28 Mar 2012 06:44:21 -0500 Thread-Topic: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Thread-Index: Ac0Mx6G0cAartglhSGqKkWzgl8GdSQADyDpA Message-ID: <154773479ED2314980CB638A48FC44348935922E@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F72DDE3.8040209@uclouvain.be> In-Reply-To: <4F72DDE3.8040209@uclouvain.be> 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 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.33 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.9 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2012 11:44:35 -0000 Olivier, I agree with all of your points. I also agree that we should NOT limit MPTC= P to the mobile environment. But that shouldn't prohibit us from adding Mob= ility as one focus point to the charter.=20 The same applies to proxies: They are not needed for data centers but we st= ill seem to agree that they deserve a spot on the revised charter. Regards, Georg -----Original Message----- From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be]=20 Sent: Wednesday, March 28, 2012 11:46 AM To: Hampel, K Georg (K Georg) Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi Nishida Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Georg, >> 1) Strong use case: >> >> MPTCP allows 3G/4G mobility operators to dynamically offload traffic >> from their air interface to unlicensed spectrum. When deployed as >> end-to-end solution, it also permits dynamically offloading the 3G/4G >> core. Together with MPTCP's middlebox compliance, there is no other >> solution that offers such features. >> >=20 > This already works with the current specification. We have an > implementation that is already able to perfom WiFi/3G offload and we are > performing measurements in real networks. >=20 > We already have some experience to prepare a report describing how MPTCP > can be used in mobile > environments. If the WG thinks that such a report would be useful, we > can prepare a first draft. >=20 > Based on our previous work, we also have some ideas on the datacenter > usecase for MPTCP and could also contribute to an applicability draft in > this domain. >=20 > [GH] That's all fine, but it doesn't affect the validity of point 1).=20 We should document use cases of MPTCP. We are ready to contribute by preparing a draft on : - mptcp use case for mobile offload - mptcp use case for datacenters MPTCP could also play a role in the IPv4/IPv6 transition and we would be ready to contribute to a draft to discuss this use case as well. >> >> There is a large group of people, e.g. mobile operators, interested to >> find a solution to the above use case and they NEVER think of MPTCP >> unless it gets the term "MOBILITY" explicitly spelled out in its charter= ! >=20 > Mobile network operators willing to see a demonstration of MPTCP in a > mobile Wifi/3G offload scenario can contact us offline... >=20 > [GH] ...if they realize that MPTCP offers a "mobility solution for traffi= c offload". Mobility-seeking people don't trigger when you say "multipath".= I don't understand why you want to miss out on this opportunity. I agreed that MPTCP can play a role in this domain and we should probably improve the marketing of MPTCP. Documenting use cases would be a good way to improve the visibility within the IETF, but not all operators follow IETF. Concerning the charter, we should not limit ourselves to the mobile environment. MPTCP has the same use cases as TCP and thus has broad applicability. Olivier --=20 INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be From georg.hampel@alcatel-lucent.com Thu Mar 29 00:18:18 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C548021E80B6 for ; Thu, 29 Mar 2012 00:18:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.376 X-Spam-Level: X-Spam-Status: No, score=-7.376 tagged_above=-999 required=5 tests=[AWL=-0.777, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vY+FXWB7qIrN for ; Thu, 29 Mar 2012 00:18:17 -0700 (PDT) Received: from ihemail4.lucent.com (ihemail4.lucent.com [135.245.0.39]) by ietfa.amsl.com (Postfix) with ESMTP id A4E6721E809A for ; Thu, 29 Mar 2012 00:18:17 -0700 (PDT) Received: from usnavsmail2.ndc.alcatel-lucent.com (usnavsmail2.ndc.alcatel-lucent.com [135.3.39.10]) by ihemail4.lucent.com (8.13.8/IER-o) with ESMTP id q2T7IAJB006361 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 29 Mar 2012 02:18:11 -0500 (CDT) Received: from USNAVSXCHHUB03.ndc.alcatel-lucent.com (usnavsxchhub03.ndc.alcatel-lucent.com [135.3.39.112]) by usnavsmail2.ndc.alcatel-lucent.com (8.14.3/8.14.3/GMO) with ESMTP id q2T7IAh0003723 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Thu, 29 Mar 2012 02:18:10 -0500 Received: from USNAVSXCHMBSA2.ndc.alcatel-lucent.com ([135.3.39.124]) by USNAVSXCHHUB03.ndc.alcatel-lucent.com ([135.3.39.112]) with mapi; Thu, 29 Mar 2012 02:18:10 -0500 From: "Hampel, K Georg (K Georg)" To: "Hampel, K Georg (K Georg)" , "Olivier.Bonaventure@uclouvain.be" Date: Thu, 29 Mar 2012 02:18:07 -0500 Thread-Topic: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Thread-Index: Ac0Mx6G0cAartglhSGqKkWzgl8GdSQADyDpAACi2d8A= Message-ID: <154773479ED2314980CB638A48FC4434893595FE@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> References: <9510D26531EF184D9017DF24659BB87F331D39D0AA@EMV65-UKRD.domain1.systemhost.net> <154773479ED2314980CB638A48FC44348935901A@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F7217B7.5030005@uclouvain.be> <154773479ED2314980CB638A48FC4434893591F2@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> <4F72DDE3.8040209@uclouvain.be> <154773479ED2314980CB638A48FC44348935922E@USNAVSXCHMBSA2.ndc.alcatel-lucent.com> In-Reply-To: <154773479ED2314980CB638A48FC44348935922E@USNAVSXCHMBSA2.ndc.alcatel-lucent.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 X-Scanned-By: MIMEDefang 2.57 on 135.245.2.39 X-Scanned-By: MIMEDefang 2.64 on 135.3.39.10 Cc: "multipathtcp@ietf.org" Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2012 07:18:18 -0000 All, One important issue to be addressed for MPTCP MOBILITY is the overhead opti= mization when only one path is available. In wireless access environments, = this applies to a large fraction of traffic. For MPTCP MOBILITY use cases, = only 1 path is used for almost all the time.=20 When only 1 path is available there is no principal reason to require full-= fledged 2-layer operation, i.e. insert/process DSS options or to require su= bflow-level buffering. This item needs more work since such optimization should not jeopardize mid= dle-box compliance. Regards, Georg -----Original Message----- From: multipathtcp-bounces@ietf.org [mailto:multipathtcp-bounces@ietf.org] = On Behalf Of Hampel, K Georg (K Georg) Sent: Wednesday, March 28, 2012 1:44 PM To: Olivier.Bonaventure@uclouvain.be Cc: multipathtcp@ietf.org Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Olivier, I agree with all of your points. I also agree that we should NOT limit MPTC= P to the mobile environment. But that shouldn't prohibit us from adding Mob= ility as one focus point to the charter.=20 The same applies to proxies: They are not needed for data centers but we st= ill seem to agree that they deserve a spot on the revised charter. Regards, Georg -----Original Message----- From: Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be]=20 Sent: Wednesday, March 28, 2012 11:46 AM To: Hampel, K Georg (K Georg) Cc: multipathtcp@ietf.org; philip.eardley@bt.com; Yoshifumi Nishida Subject: Re: [multipathtcp] Proposal for revised charter: MPTCP MOBILITY Georg, >> 1) Strong use case: >> >> MPTCP allows 3G/4G mobility operators to dynamically offload traffic >> from their air interface to unlicensed spectrum. When deployed as >> end-to-end solution, it also permits dynamically offloading the 3G/4G >> core. Together with MPTCP's middlebox compliance, there is no other >> solution that offers such features. >> >=20 > This already works with the current specification. We have an > implementation that is already able to perfom WiFi/3G offload and we are > performing measurements in real networks. >=20 > We already have some experience to prepare a report describing how MPTCP > can be used in mobile > environments. If the WG thinks that such a report would be useful, we > can prepare a first draft. >=20 > Based on our previous work, we also have some ideas on the datacenter > usecase for MPTCP and could also contribute to an applicability draft in > this domain. >=20 > [GH] That's all fine, but it doesn't affect the validity of point 1).=20 We should document use cases of MPTCP. We are ready to contribute by preparing a draft on : - mptcp use case for mobile offload - mptcp use case for datacenters MPTCP could also play a role in the IPv4/IPv6 transition and we would be ready to contribute to a draft to discuss this use case as well. >> >> There is a large group of people, e.g. mobile operators, interested to >> find a solution to the above use case and they NEVER think of MPTCP >> unless it gets the term "MOBILITY" explicitly spelled out in its charter= ! >=20 > Mobile network operators willing to see a demonstration of MPTCP in a > mobile Wifi/3G offload scenario can contact us offline... >=20 > [GH] ...if they realize that MPTCP offers a "mobility solution for traffi= c offload". Mobility-seeking people don't trigger when you say "multipath".= I don't understand why you want to miss out on this opportunity. I agreed that MPTCP can play a role in this domain and we should probably improve the marketing of MPTCP. Documenting use cases would be a good way to improve the visibility within the IETF, but not all operators follow IETF. Concerning the charter, we should not limit ourselves to the mobile environment. MPTCP has the same use cases as TCP and thus has broad applicability. Olivier --=20 INL, ICTEAM, UCLouvain, Belgium, http://inl.info.ucl.ac.be _______________________________________________ multipathtcp mailing list multipathtcp@ietf.org https://www.ietf.org/mailman/listinfo/multipathtcp From mglt.ietf@gmail.com Thu Mar 29 08:20:43 2012 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6BF6821F8847; Thu, 29 Mar 2012 08:20:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.474 X-Spam-Level: X-Spam-Status: No, score=-3.474 tagged_above=-999 required=5 tests=[AWL=0.124, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FDv1VaGnx-lB; Thu, 29 Mar 2012 08:20:42 -0700 (PDT) Received: from mail-yx0-f172.google.com (mail-yx0-f172.google.com [209.85.213.172]) by ietfa.amsl.com (Postfix) with ESMTP id 39D0321F883F; Thu, 29 Mar 2012 08:20:42 -0700 (PDT) Received: by yenm5 with SMTP id m5so1705809yen.31 for ; Thu, 29 Mar 2012 08:20:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=XSj4mm6v+u2cHtSm/zEtKifghznIUo7kXhDJszeIKbA=; b=sT2dYiAMqyxaskqkJedG43QI+aEj/Nh+51GQslY4pfy0Ub0CBI/L4I/iHjIkfZEG2U TWrz0h0xB0XJSISoWF+RY0lSxIK691wR4hYyJ/1jQzfyGxEi3K+kXQiCfQcjLK8NIUdq 263a/v9zdZyIE5oTptrSimXn4a3qm+bPWwnRhe3CLWFgnhqg8jdmfUenX9mtUT05iQOG eK0sjW6M7kWFSSFtaK/3h1WXHnn/k6PluXncWY2DHU6LyQyFvwdNupszz2y4hMNTDl3N LGqs/Qs5Ab0PmoZ7K1cN9o+pxIFXwd/zZhLMGxiRkguPJ16kWv/Zlj6uu5OhdRm+pffZ ZMMg== MIME-Version: 1.0 Received: by 10.68.125.195 with SMTP id ms3mr745941pbb.62.1333034441316; Thu, 29 Mar 2012 08:20:41 -0700 (PDT) Received: by 10.142.133.19 with HTTP; Thu, 29 Mar 2012 08:20:41 -0700 (PDT) In-Reply-To: <20120329151424.12323.65627.idtracker@ietfa.amsl.com> References: <20120329151424.12323.65627.idtracker@ietfa.amsl.com> Date: Thu, 29 Mar 2012 17:20:41 +0200 Message-ID: From: Daniel Migault To: mif@ietf.org, "multipathtcp@ietf.org Mailing List" Content-Type: multipart/alternative; boundary=047d7b2e4cdc5918cf04bc634450 Subject: [multipathtcp] Fwd: New Version Notification for draft-mglt-mif-security-requirements-01.txt X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2012 15:20:43 -0000 --047d7b2e4cdc5918cf04bc634450 Content-Type: text/plain; charset=ISO-8859-1 Hi, Please find the version 01 of draft-mglt-mif-security-requirements-01.txt. Feel free to make comments on it. We would like to thank those who provided comments for version 00. They were very useful for us. Regards, Daniel ---------- Forwarded message ---------- From: Date: Thu, Mar 29, 2012 at 5:14 PM Subject: New Version Notification for draft-mglt-mif-security-requirements-01.txt To: mglt.ietf@gmail.com Cc: carlw@mcsr-labs.org A new version of I-D, draft-mglt-mif-security-requirements-01.txt has been successfully submitted by Daniel Migault and posted to the IETF repository. Filename: draft-mglt-mif-security-requirements Revision: 01 Title: Multiple Interfaces IPsec Security Requirements Creation date: 2012-03-29 WG ID: Individual Submission Number of pages: 11 Abstract: ISPs wants to take advantage of MIF Transport protocols like SCTP, MPTCP to enhance their End User's experience when the End User has been offloaded on WLAN. In addition, WLAN are untrusted so ISPs MUST Secure at least some of their End Users's communications. For various reasons IPsec is the protocol they choose to secure the communications. Currently, IPsec is not adapted to Multiple Interfaces Environment. IPsec can hardly be configured in a proper way which may result in breaking End Users' communications. At least, it makes it very hard for the End Users to combine Security with MIF enhancements. MOBIKE partly address the problem for a single Interface. This draft provides the problem statement and defines the IPsec Security Requirements for MIF. The IETF Secretariat -- Daniel Migault Orange Labs -- Security +33 6 70 72 69 58 --047d7b2e4cdc5918cf04bc634450 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi,
Please find the version 01 of draft-mglt-mif-security-requirements-0= 1.txt. Feel free to make comments on it.
We would like to thank those wh= o provided comments for version 00. They were very useful for us.

Regards,
Daniel

---------- Forwarded = message ----------
From: <internet-drafts@ietf.= org>
Date: Thu, Mar 29, 2012 at 5:14 PM
Subject: New Version Notification for= draft-mglt-mif-security-requirements-01.txt
To: mglt.ietf@gmail.com
Cc: carlw@mcsr-labs.org


A new version of I-D, draft-mglt-mif-security-requirements-01.txt h= as been successfully submitted by Daniel Migault and posted to the IETF rep= ository.

Filename: =A0 =A0 =A0 =A0draft-mglt-mif-security-requirements
Revision: =A0 =A0 =A0 =A001
Title: =A0 =A0 =A0 =A0 =A0 Multiple Interfaces IPsec Security Requirements<= br> Creation date: =A0 2012-03-29
WG ID: =A0 =A0 =A0 =A0 =A0 Individual Submission
Number of pages: 11

Abstract:
=A0 ISPs wants to take advantage of MIF Transport protocols like SCTP,
=A0 MPTCP to enhance their End User&#39;s experience when the End User= has
=A0 been offloaded on WLAN. =A0In addition, WLAN are untrusted so ISPs MUS= T
=A0 Secure at least some of their End Users&#39;s communications. =A0F= or
=A0 various reasons IPsec is the protocol they choose to secure the
=A0 communications. =A0Currently, IPsec is not adapted to Multiple
=A0 Interfaces Environment. =A0IPsec can hardly be configured in a proper<= br> =A0 way which may result in breaking End Users&#39; communications. = =A0At
=A0 least, it makes it very hard for the End Users to combine Security
=A0 with MIF enhancements. =A0MOBIKE partly address the problem for a
=A0 single Interface. =A0This draft provides the problem statement and
=A0 defines the IPsec Security Requirements for MIF.




The IETF Secretariat



--
Daniel Migault
Orange Labs -- Sec= urity
+33 6 70 72 69 58
--047d7b2e4cdc5918cf04bc634450--