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

Igor Lubashev <> Tue, 11 December 2018 01:48 UTC

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From: Igor Lubashev <>
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Subject: Re: [quicwg/base-drafts] Endpoints MAY (not SHOULD) ignore IPv4 ICMP PTB messages (#2109)
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> We have text that defines validation in a way that doesn't exclusively depend on having more than 8 bytes to rely on.

There is a difference between "failed validation" and "do not / cannot perform validation".  This sentence applies only to the latter case.  The argument is that if an implementation cannot perform validation (for whatever reason, including the limitations of the platform or limitations of the implementation itself), it is better to honor ICMP PTB (up to the 1280 limit) than to risk driving packets into a black hole.

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