[quicwg/base-drafts] What does a server do with Handshake packets not belonging any connection? (#2333)

[Marten Seemann <[e-mail]>]

This could e.g. happen if a server loses state after sending the ServerHello, and comes back up before the client gives up. Or it could just be an incorrectly routed Handshake packet.

Currently, the spec doesn't say anything explicitly about this case, so the general case about receiving a packet that is not associated with any connection applies, thus we'd send a Stateless Reset. There are two problems with this solution:

* We clearly can do better than sending a random data, since we have access to the source connection ID on the incoming packet, so in principle we are able to ensure correct routing of the stateless reset.
* That doesn't really help though, since the client might not have received the stateless reset token yet, and would just drop the stateless reset.

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