Re: [quicwg/base-drafts] Endpoints MAY (not SHOULD) ignore IPv4 ICMP PTB messages (#2109)

Martin Thomson <> Thu, 13 December 2018 06:22 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Endpoints MAY (not SHOULD) ignore IPv4 ICMP PTB messages (#2109)
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If we step back a little let's list what what we would like to have happen:

1. if the PMTU is being forced below 1280, ignore it
2. validate the packet, using whatever means you like (this is likely a policy decision) and throw out packets that don't pass the test
3. adjust the PMTU 

Based on that, I think that we can make the test simpler.

FWIW, I don't agree that matching addresses is sufficient, but I'm happy to leave that to endpoints to each decide for themselves.

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