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Re: Non-Last Small IPv6 Fragments

Ole Troan <otroan@employees.org> Sun, 13 January 2019 20:27 UTC

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Subject: Re: Non-Last Small IPv6 Fragments
From: Ole Troan <otroan@employees.org>
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Date: Sun, 13 Jan 2019 21:27:19 +0100
Cc: Tom Herbert <tom@herbertland.com>, Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
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To: Nick Hilliard <nick@foobar.org>
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> On 13 Jan 2019, at 21:21, Nick Hilliard <nick@foobar.org> wrote:
> 
> 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.

“Fix” as in something different than rfc8201. 

Ole

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