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Re: [quicwg/base-drafts] Connection ID Length changes (#2473)

Kazuho Oku <notifications@github.com> Fri, 15 February 2019 22:35 UTC

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Date: Fri, 15 Feb 2019 22:35:36 +0000
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Connection ID Length changes (#2473)
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@martinduke 
> If a short header comes in from a new address, simply match a known local CID, like for any other non-ZLCID connection. If no match, drop it.

The issue with the approach is that the server cannot distinguish between a connection that it has lost state and a broken packet with zero-length CID. The server loses the ability to send stateless resets for all of the connections it handles.

Note: IIUC, a server is expected to generate stateless reset tokens by using 5-tuple (if CIDL=0) or by using CID (if CIDL!=0).

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