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

[martinduke <[e-mail]>]

Either I have been very unclear, or I am proposing something that makes a simple error so that it is confusing everybody. Here is what I am proposing to allow (CIDs are letters)

Client                                                                                                    Server
[ Connection already setup; client has no CID ]
IP: 1.1.1.1 to 2.2.2.2 (DCID A) ----->
           (contains NEW_CONN_ID B)
                                                                              <--- IP: 2.2.2.2 to 1.1.1.1 (no DCID)
                                                                                       (contains NEW_CONN_ID C)
(exchange continues with IP addresses above, with no CID to client and CID A to server)
(then there's an address change)
IP: 3.3.3.3 to 2.2.2.2 (DCID C) -------->
                                                                               <---- IP: 2.2.2.2 to 3.3.3.3 (DCID B)

This is the case I am concerned about. I do not see, at the moment, any reason why switching "client" and "server" above should make a difference.

What I am definitely NOT proposing is that an endpoint migrate while never accepting a non-ZL CID.

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