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Re: [quicwg/base-drafts] ICMP and ICMPv6 PMTUD with asymmetric connection-ids (#1243)

Igor Lubashev <notifications@github.com> Sat, 30 June 2018 12:49 UTC

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From: Igor Lubashev <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] ICMP and ICMPv6 PMTUD with asymmetric connection-ids (#1243)
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All ICMPv6 and a growing number of ICMPv4 packets include a few hundred octets of the packet that triggered that ICMP.

A QUIC sender can be behind a load balancer that requires a Server CID to route packets to that server (this is what we designed Server CID for). However, short header packets do not contain Server CID. Hence, when doing a PMTUD probe, such servers may need to use something that would ensure the presence of Server CID in the UDP datagram. (I.e. they may want to use this method when sending packets larger than any packet for which they had received an ACK from this path before.)

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