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Re: Non-Last Small IPv6 Fragments

Nick Hilliard <nick@foobar.org> Sun, 13 January 2019 20:21 UTC

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Subject: Re: Non-Last Small IPv6 Fragments
To: Ole Troan <otroan@employees.org>
Cc: Tom Herbert <tom@herbertland.com>, Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
References: <CAOSSMjV0Vazum5OKztWhAhJrjLjXc5w5YGxdzHgbzi7YVSk7rg@mail.gmail.com> <CAN-Dau1HwG5RndacpSA+si+zKuTdpSvA=QA1A11A==rMNe=4+w@mail.gmail.com> <CALx6S35KNhV2gFp9OdU+M1zy5WUuEAEvXkDXNDWWxi7uQ4e_cw@mail.gmail.com> <CAN-Dau0rTdiiF2SjByxcMG6nhPCEjUH2pYBCOeK_FSGJ_ucDQw@mail.gmail.com> <CALx6S34AyV9OpvnjQhQc56n5vfeVgU5Zd3kheP0g+XvsMbBV9g@mail.gmail.com> <1b2e318e-1a9f-bb5d-75a5-04444c42ef20@si6networks.com> <CALx6S37TJr++fC=pVoeS=mrO1fHc4gL_Wtu-XkVTswzs2XxXCA@mail.gmail.com> <CALx6S36V7vrVyoTP0G6+S5XeFNB3KWS5UaNnVi20xogRERdCfg@mail.gmail.com> <973A1649-55F6-4D97-A97F-CEF555A4D397@employees.org> <CALx6S34YbBe8xBod3VsWVO33TpZcdxh2uV1vaO8Z_NKnVXp66g@mail.gmail.com> <A3C3F9C0-0A07-41AF-9671-B9E486CB8246@employees.org> <AEA47E27-C0CB-4ABE-8ADE-51E9D599EF8F@gmail.com> <6aae7888-46a4-342d-1d76-10f8b50cebc4@gmail.com> <CALx6S35 QKOqn_Ywh9yzm1JDA8Xnp7fLPPmXUvomvz_xOZP8bfg@mail.gmail.com> <EC9CC5FE-5215-4105-8A34-B3F123D574B9@employees.org>
From: Nick Hilliard <nick@foobar.org>
Message-ID: <4c56f504-7cd7-6323-b14a-d34050d13f4e@foobar.org>
Date: Sun, 13 Jan 2019 20:21:01 +0000
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Ole Troan wrote on 13/01/2019 20:03:
> Let’s fix path MTU discovery. There’s no fix for fragmentation.

pmtu discovery is hard because it needs a way for an intermediate node 
to be able to signal a transmitting node to dynamically drop the MTU if 
network conditions change.  The only way to reliably work around this is 
to transmit at 1280 and claim implementation / operational breakage if 
this cannot get through.  This, however, robs the host devices of the 
ability to use higher MTUs.

Nick

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