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

Marten Seemann <notifications@github.com> Wed, 15 January 2020 15:39 UTC

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Subject: Re: [quicwg/base-drafts] Which DCID do Handshake retransmissions use? (#3348)
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> * a) let the receiver of NCID to send Handshake packets using the new CIDs
> * b) require (or recommend) receiver of NCID to continue using the original DCID until the handshake is confirmed
> * c) require (or recommend) the sender to withhold the emission NCID (with a non-zero RTP) to until it sees an ACK for handshake confirmation

@kazuho There's a fourth option:
* d) require that the sender withholds the NCID frame until it has confirmed the handshake.

As soon as an endpoint confirms the handshake, it drops the Handshake keys (I'm assuming #3145 here). As a result, the endpoint obviously doesn't care about Handshake packets any longer (and especially doesn't care which DCID was used to send the packet).
Therefore, there's no problem if the receiver of the NCID frame immediately retires the connection ID used during the handshake, even if the the NCID and the HANDSHAKE_DONE frame were reordered.

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