Re: [quicwg/base-drafts] Which DCID do Handshake retransmissions use? (#3348)

Kazuho Oku <notifications@github.com> Wed, 05 February 2020 11:57 UTC

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Subject: Re: [quicwg/base-drafts] Which DCID do Handshake retransmissions use? (#3348)
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I think I'd prefer a design that meets the two requirements stated below:
* A server should not be required to withhold NCID frames until it receives an ACK for HANDSHAKE_DONE.
* A client should be allowed to use the original CID until the handshake is confirmed.

The intention is to minimize additional complexity to existing (and future) QUIC stacks.

One solution that meets these requirements is to state that a NCID frame confirms the handshake, exactly the same way as HANDSHAKE_DONE frame does. That would be a trivial change to any of the QUIC stacks, and there would be no ambiguity regarding the state changes.

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