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Re: [v6ops] I-D Action: draft-vasilenko-v6ops-ipv6-oversized-analysis-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 23 March 2021 00:57 UTC

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To: IPv6 Operations <v6ops@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Tue, 23 Mar 2021 13:57:39 +1300
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Subject: Re: [v6ops] I-D Action: draft-vasilenko-v6ops-ipv6-oversized-analysis-00.txt
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>    Initial SRv6 implementations that trespassed safe limit in 220B are
>    the reason for recent activities in MTU problem research.

I don't understand that motivation. Since SRV6 is explicitly limited to a specific domain, as stated in Section 2 of RFC8402, it is reasonable to expect that the domain is designed with a large enough MTU to allow the expected extra headers for SRV6, and that will include any tunnel end points within the domain knowing how to support packets longer than 1280 bytes if that is needed. An obvious design goal would be to make both PMTUD and PLPMTUD unnecessary within the domain.

Regards
   Brian Carpenter

On 20-Mar-21 09:06, internet-drafts@ietf.org wrote:
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> 
> 
>         Title           : IPv6 Oversized Packets Analysis
>         Authors         : Eduard Vasilenko
>                           Xiao Xipeng
>                           Dmitriy Khaustov
> 	Filename        : draft-vasilenko-v6ops-ipv6-oversized-analysis-00.txt
> 	Pages           : 19
> 	Date            : 2021-03-19
> 
> Abstract:
>    The IETF has many new initiatives relying on IPv6 Enhanced Headers
>    added in transit: SRv6, SFC, BIERv6, iOAM. Additionally, some recent
>    developments are overlays (SRv6, VxLAN) over IPv6. It could create
>    oversized packets that need to be dealt with. This document analyzes
>    available standards for the resolution of oversized packet drops.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-vasilenko-v6ops-ipv6-oversized-analysis/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-vasilenko-v6ops-ipv6-oversized-analysis-00
> https://datatracker.ietf.org/doc/html/draft-vasilenko-v6ops-ipv6-oversized-analysis-00
> 
> 
> 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.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> 
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