RE: New Version Notification for draft-herbert-ipv6-update-dest-ops-00.txt
Xiejingrong <xiejingrong@huawei.com> Sat, 08 September 2018 08:49 UTC
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From: Xiejingrong <xiejingrong@huawei.com>
To: Tom Herbert <tom@herbertland.com>, 6man <ipv6@ietf.org>
Subject: RE: New Version Notification for draft-herbert-ipv6-update-dest-ops-00.txt
Thread-Topic: New Version Notification for draft-herbert-ipv6-update-dest-ops-00.txt
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Date: Sat, 08 Sep 2018 08:49:36 +0000
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Hi Tom, For the below description: If a Destination Option is marked to be changeable (the third-highest order bit of the option type is set) and is in a Destination Options header that follows a Routing header, or there is no Routing header present, then the Option Data cannot be changed en route. There are no nodes in the path that are permitted to change the Option Data. I think it did not consider the Destination Option when IPv6 DA being Multicast Address. Multicast routing is also a kind of routing and one can find many 'multicast routing' RFCs. And obviously, Destination Option can be used with Multicast Address as IPv6 DA. To quote RFC8200: The Option Type identifiers are internally encoded such that their highest-order 2 bits specify the action that must be taken if the processing IPv6 node does not recognize the Option Type: 00 - skip over this option and continue processing the header. 01 - discard the packet. 10 - discard the packet and, regardless of whether or not the packet's Destination Address was a multicast address, send an ICMP Parameter Problem, Code 2, message to the packet's Source Address, pointing to the unrecognized Option Type. 11 - discard the packet and, only if the packet's Destination Address was not a multicast address, send an ICMP Parameter Problem, Code 2, message to the packet's Source Address, pointing to the unrecognized Option Type. Thanks Jingrong -----Original Message----- From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Tom Herbert Sent: Saturday, August 18, 2018 3:29 AM To: 6man <ipv6@ietf.org> Subject: Fwd: New Version Notification for draft-herbert-ipv6-update-dest-ops-00.txt Hello, I wrote up a short draft to try to clarify the requirements of processing Destination Options that are before a Routing header. This work was motivated by some of the discussions around SRv6. It also would one of the arguments that TLVs in SRv6 are needed because Destination Options can't be ignored at SRv6 destinations. The draft also clarifies what it means for a Destination Option to be changeable en route. Thanks, Tom ---------- Forwarded message ---------- From: <internet-drafts@ietf.org> Date: Fri, Aug 17, 2018 at 12:18 PM Subject: New Version Notification for draft-herbert-ipv6-update-dest-ops-00.txt To: Tom Herbert <tom@quantonium.net> A new version of I-D, draft-herbert-ipv6-update-dest-ops-00.txt has been successfully submitted by Tom Herbert and posted to the IETF repository. Name: draft-herbert-ipv6-update-dest-ops Revision: 00 Title: Updates to Destination Options Processing Document date: 2018-08-17 Group: Individual Submission Pages: 5 URL: https://www.ietf.org/internet-drafts/draft-herbert-ipv6-update-dest-ops-00.txt Status: https://datatracker.ietf.org/doc/draft-herbert-ipv6-update-dest-ops/ Htmlized: https://tools.ietf.org/html/draft-herbert-ipv6-update-dest-ops-00 Htmlized: https://datatracker.ietf.org/doc/html/draft-herbert-ipv6-update-dest-ops Abstract: This document updates the requirements for processing Destination Options in IPv6 in two ways. First, the requirement that all intermediate destinations in a Routing header must process options in a Destination header appearing before the Routing header is relaxed. Secondly, the processing of a Destination Option marked as changeable is clarified. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
- Fwd: New Version Notification for draft-herbert-i… Tom Herbert
- RE: New Version Notification for draft-herbert-ip… Xiejingrong