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Re: [quicwg/base-drafts] Coalescing different CIDs for same connection (#3800)

Marten Seemann <notifications@github.com> Wed, 15 July 2020 16:04 UTC

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Date: Wed, 15 Jul 2020 09:04:40 -0700
From: Marten Seemann <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Coalescing different CIDs for same connection (#3800)
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@tatsuhiro-t Once a non-coalesced packet is passed to a connection, in my implementation I don't have to do any checking. The server already makes sure to pass packets to the correct connection based on the DCID.
So there's additional validation logic required for coalesced packets. And the easiest way is to just check that all DCIDs match. Sure, it would be possible to somehow query which other DCIDs would also be valid for the same session, but it's more complicated. And given that nobody has come up with any good reason to coalesce packets with different DCIDs in the first place, I'm wondering how this additional complexitiy would be justified.

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