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

Erik Nygren <notifications@github.com> Mon, 19 March 2018 22:14 UTC

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Date: Mon, 19 Mar 2018 22:14:41 +0000
From: Erik Nygren <notifications@github.com>
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Subject: [quicwg/base-drafts] ICMP and ICMPv6 PMTUD with asymmetric connection-ids (#1243)
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Asymmetric connection-ids introduce problems for handling ICMP and ICMPv6 PMTUD messages (such as ICMPv6 packet-too-big) in conjunction with stateless load balancers.  For example, if a server sends out a packet containing a client connection-id that is too big, a router or tunnel end-point may send back an ICMPv6 PTB message containing the packet header.  Because the PTB message with the packet header only contains the client connecton-id, it isn't possible to route to the proper server.

While ICMP/ICMPv6 PTB messages are best treated as optimizations, being able to get them can be very useful for identifying the source off loss quickly as being a too-large packet.

Note that other ICMP(v6) messages such as destination-unreachable also have a similar problem with asymmetric connection-ids.

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