Re: [quicwg/base-drafts] Server's preferred address (#1251)

[Mike Bishop <[e-mail]>]

MikeBishop commented on this pull request.



> +QUIC allows servers to accept connections on one IP address and attempt to
+transfer these connections to a more preferred address shortly after the
+handshake.  This section describes the protocol for migrating a connection to a
+new server address.
+
+Migrating a connection to a new server address mid-connection is left for future
+work. If a client receives packets from a new server address not indicated by
+the preferred_address transport parameter, the client SHOULD discard these
+packets.
+
+### Initiating Connection Migration
+
+A server initiates connection migration by including the preferred_address
+transport parameter in the TLS handshake.
+
+Once the handshake is finished, the client MUST initiate path validation (see

The server can't actually know if the client's probe fails to reach it for some reason, so it's going to have to tolerate clients failing to switch anyway.  This could probably become a SHOULD without changing logic on anyone's side.

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