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Re: [quicwg/base-drafts] QUIC header format/demultiplexing (#426)

Colin Perkins <notifications@github.com> Wed, 06 December 2017 16:48 UTC

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Date: Wed, 06 Dec 2017 16:48:04 +0000
From: Colin Perkins <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] QUIC header format/demultiplexing (#426)
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If all you care about is demuxing QUIC and STUN, then there are several alternatives. The fingerprint is one option, certainly. Inspecting the first two bits of the packet and checking for the presence of STUN Magic Cookie is another that's simpler (especially if we revert the C bit in the short header packets). 

I do think there are use cases for demuxing QUIC with other protocols, however (@aboba likely has input too). #956 (and the -08 draft) supports this with only minimal changes to QUIC (renumbering fields, no semantic changes). 

We do need to document a long-term stable demux algorithm for QUIC and STUN, and decide to what extent we want a stable algorithm for demuxing QUIC and other protocols. My feeling is that one of the QUIC invariants has to be an algorithm for demuxing QUIC and STUN, but for demultiplexing QUIC and other protocols we should say "this works for QUIC v1, but we don't guarantee for future versions of QUIC".

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