Re: [quicwg/base-drafts] Retire My Own CID (#2645)

Kazuho Oku <notifications@github.com> Wed, 22 May 2019 15:56 UTC

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Subject: Re: [quicwg/base-drafts] Retire My Own CID (#2645)
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> One solution is that the sender must not update a connection ID until the previous packet/frame was acknowledged. The other possibility would that receiver keep track of the packet number the connection ID was received in. Always use the CID in the most recent packet number.

I do not think that either of the two would work considering the fact that an endpoint is permitted to retransmit out-of-date frames as they are.

Consider the case where an endpoint first sends packet(pn=x,REPLACE_CONN_CID(seq=y,new_value=a)), then sends packet(pn=y,REPLACE_CONN_ID(seq=y,new_value=b)). If pn=x is deemed lost, then the endpoint is permitted to send(pn=z, REPLACE_CONN_CID(seq=y,new_value=a)), where z is greater than y.

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