[Seamoby] DoCoMo Implementation Issues with CTP
"James Kempf" <kempf@docomolabs-usa.com> Tue, 17 February 2004 22:25 UTC
Received: from optimus.ietf.org (optimus.ietf.org [132.151.1.19]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id RAA12567 for <seamoby-archive@odin.ietf.org>; Tue, 17 Feb 2004 17:25:03 -0500 (EST)
Received: from localhost.localdomain ([127.0.0.1] helo=www1.ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1AtDds-0006sB-Dk for seamoby-archive@odin.ietf.org; Tue, 17 Feb 2004 17:24:36 -0500
Received: (from exim@localhost) by www1.ietf.org (8.12.8/8.12.8/Submit) id i1HMOaF9026419 for seamoby-archive@odin.ietf.org; Tue, 17 Feb 2004 17:24:36 -0500
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1AtDds-0006s2-9z for seamoby-web-archive@optimus.ietf.org; Tue, 17 Feb 2004 17:24:36 -0500
Received: from ietf-mx (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id RAA12552 for <seamoby-web-archive@ietf.org>; Tue, 17 Feb 2004 17:24:32 -0500 (EST)
Received: from ietf-mx ([132.151.6.1]) by ietf-mx with esmtp (Exim 4.12) id 1AtDdp-0005ua-00 for seamoby-web-archive@ietf.org; Tue, 17 Feb 2004 17:24:33 -0500
Received: from exim by ietf-mx with spam-scanned (Exim 4.12) id 1AtDcv-0005pM-00 for seamoby-web-archive@ietf.org; Tue, 17 Feb 2004 17:23:37 -0500
Received: from optimus.ietf.org ([132.151.1.19]) by ietf-mx with esmtp (Exim 4.12) id 1AtDcM-0005kj-00 for seamoby-web-archive@ietf.org; Tue, 17 Feb 2004 17:23:02 -0500
Received: from localhost.localdomain ([127.0.0.1] helo=www1.ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1AtDcL-0006iP-Sw; Tue, 17 Feb 2004 17:23:01 -0500
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1AtDbr-0006fK-8s for seamoby@optimus.ietf.org; Tue, 17 Feb 2004 17:22:31 -0500
Received: from ietf-mx (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id RAA12350 for <seamoby@ietf.org>; Tue, 17 Feb 2004 17:22:27 -0500 (EST)
Received: from ietf-mx ([132.151.6.1]) by ietf-mx with esmtp (Exim 4.12) id 1AtDbo-0005iN-00 for seamoby@ietf.org; Tue, 17 Feb 2004 17:22:28 -0500
Received: from exim by ietf-mx with spam-scanned (Exim 4.12) id 1AtDat-0005dv-00 for seamoby@ietf.org; Tue, 17 Feb 2004 17:21:31 -0500
Received: from key1.docomolabs-usa.com ([216.98.102.225] helo=fridge.docomolabs-usa.com ident=fwuser) by ietf-mx with esmtp (Exim 4.12) id 1AtDaN-0005Zj-00 for seamoby@ietf.org; Tue, 17 Feb 2004 17:21:00 -0500
Message-ID: <059c01c3f5a4$63e9e360$936015ac@dclkempt40>
From: James Kempf <kempf@docomolabs-usa.com>
To: seamoby@ietf.org
Cc: Raghu Dendukuri <dendukuri@docomolabs-usa.com>
Date: Tue, 17 Feb 2004 14:21:29 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: 7bit
Subject: [Seamoby] DoCoMo Implementation Issues with CTP
Sender: seamoby-admin@ietf.org
Errors-To: seamoby-admin@ietf.org
X-BeenThere: seamoby@ietf.org
X-Mailman-Version: 2.0.12
Precedence: bulk
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/seamoby>, <mailto:seamoby-request@ietf.org?subject=unsubscribe>
List-Id: Context Transfer, Handoff Candidate Discovery, and Dormant Mode Host Alerting <seamoby.ietf.org>
List-Post: <mailto:seamoby@ietf.org>
List-Help: <mailto:seamoby-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/seamoby>, <mailto:seamoby-request@ietf.org?subject=subscribe>
X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on ietf-mx.ietf.org
X-Spam-Status: No, hits=0.1 required=5.0 tests=AWL autolearn=no version=2.60
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: 7bit
DoCoMo is in the process of implementing CTP, and we came up with the following list of issues in the spec. Since none of them seem particularly large, Allison suggested that we simply update the current version of the document (which is now under review by the ROHC WG) in place, without reving the document to a new version. She will make the changes. Below, a list of the issues and suggested changes to the document to address them. Any comments? Please let me know by March 6. jak ------------------------------------------- 1) Section 2.5.1, pg. 10; Section 2.5.2, pg. 11; Section 2.5.3, pg. 12; Section 2.5.4, pg. 13; Section 2.5.6, pg. 15 - 'V' flag The spec allows CTP messages to carry both IPv4 and IPv6 addresses, but as a practical matter in the implementation, a CTP message will be sent to the IPv4 or IPv6 address of a router. Processing the address of the opposite version in the stack is complicated. Suggestion is to only allow IPv4 or IPv6 addresses, but keep the flag field size at 2 bits in case further experience shows that there are reasons why both might be sent. The router can issue separate messages if both addresses must be changed, Suggested change in text: Replace: "When set to '10', indicate presence of both IPv6 and IPv4 Previous (New) addresses." With: "Values of '10' and '11' are reserved". 2) Section 2.5.3, pg. 12 - Length of Algorithm field in CTD message block. The length of the algorithm field in the CTD message block is shown as 17 bits. It should be 16. 3) Section 2.5.1, pg. 10; Section 2.5.2, pg. 11; Section 2.5.3, pg. 12; Section 2.5.4, pg. 13; Section 2.5.6, pg. 15 - Length field. The size of the message length field is currently 8 bits, and the units for the length are in 8 octet words. This allows a maximum of 2048 octets, which might not be enough for bundling large amounts of context if padding is required. Suggestion is to increase the size of the field and make it be units of octets, for a total of 65535 octets. This would only involve moving the flags into the Reserved field, and would not otherwise modify the message. Replace: In message diagram blocks, move Length to be 16 bits rather than 8. Replace: "Length message length in units of 8 octet words" With: "Length message length in units of octets" 4) Section 2.5.1. pg. 9; Section 2.5.2, pg. 11; Section 2.5.3, pg. 12; Section 2.5.4, pg. 13; Section 2.5.5, pg. 14; Section 2.4.6, pg. 15 - IP address field size. The message block diagrams show the size of the IP address fields as 4 octets, but if the IP address is for IPv6, it will be 16. Replace: In the message block diagrams, replace the final "|" with a "~" to indicate a variable length field. Indicate variable length field by putting "(4 or 16 octets)" after the text in the field. 5) Section 2.5.3, pg. 12 - Key field in message diagram Only 4 bytes are shown for the key field, but the key size field allows 65535. The message diagram needs to be changed. Replace: In the message diagram, replace the final "|" with a "~" to indicate a variable length field. Indicate the variable length field by putting "(variable)" after the text in the field. _______________________________________________ Seamoby mailing list Seamoby@ietf.org https://www1.ietf.org/mailman/listinfo/seamoby
- [Seamoby] DoCoMo Implementation Issues with CTP James Kempf
- RE: [Seamoby] DoCoMo Implementation Issues with C… john.loughney
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- RE: [Seamoby] DoCoMo Implementation Issues with C… Soliman Hesham
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- RE: [Seamoby] DoCoMo Implementation Issues with C… Soliman Hesham
- Re: [Seamoby] DoCoMo Implementation Issues with C… James Kempf
- Re: [Seamoby] DoCoMo Implementation Issues with C… James Kempf
- Re: [Seamoby] DoCoMo Implementation Issues with C… James Kempf
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… Raghu
- Re: [Seamoby] DoCoMo Implementation Issues with C… James Kempf
- Re: [Seamoby] DoCoMo Implementation Issues with C… Rajeev Koodli
- Re: [Seamoby] DoCoMo Implementation Issues with C… James Kempf