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Re: [quicwg/base-drafts] Updated ICMP PMTU section (#1412)

Igor Lubashev <notifications@github.com> Mon, 18 June 2018 21:30 UTC

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Subject: Re: [quicwg/base-drafts] Updated ICMP PMTU section (#1412)
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igorlord commented on this pull request.



>  
-* Any reduction in PMTU due to a report contained in an ICMP packet is
+If an ICMP PTB message is received after handshake, and the claimed Path MTU is
+at least 1280 octets for messages with on-path validation or 1392 for messages

Somewhat arbitrary, examining various tunneling protocols out there to see what seems like a conservative-enough number that is not too small to be significantly concerned with degraded performance.  This number would certainly need a wg consensus.

The goal was to make sure that in the common case (no attack), we can switch to a workable PMTU immediately.

Of course, if the wg believes that 1280 is "large enough" to use it immediately, this would simplify things.

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