Subject: Re: [quicwg/base-drafts] Don't Change Source CID After Retry (#1491)
From: MikkelFJ <[email-masked]>
To: quicwg/base-drafts <[email-masked]>
Cc: Subscribed <[email-masked]>
Date: Wed, 27 Jun 2018 10:49:21 -0700
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>

Not all in fresh memory but goes like:
Clients sends original random DCID to server.
Server sends retry back to client with a servers SCID
Client uses retry SCID as its new DCID towards the server.
Client uses whatever SCID it happens to prefer, 0 lenght or otherwise, call this Client-SCID.

If the Client-SCID does not change an new random retries happen, the client might be confused. If the server changes Client-SCID it can distinguish responses. But there is a long dicussion that never got fully resolved. Changing Client-SCID is just one option. Reflecting a separate NONCE per retry is probably either better or also needed.

https://github.com/quicwg/base-drafts/issues/1451

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