Re: [quicwg/base-drafts] Allow servers to send a preferred address of each address family (#2296)

[ianswett <[e-mail]>]

ianswett requested changes on this pull request.



> @@ -2116,6 +2116,9 @@ packets.
 A server conveys a preferred address by including the preferred_address
 transport parameter in the TLS handshake.
 
+Servers MAY communicate a preferred address of each address family (IPv4 and

I realize, looking back on the issue, why Jana mentioned alternate.  There are two separate cases: Connection migration and Server's Preferred Address.

In one case, you want to make sure connection migration doesn't fail when moving from v6 to v4 only, but you don't want them to do anything after the handshake.  In the other case, you want them to migrate to a more stable IP after the handshake.

If the server omits the address family you connected on, but supplies a preferred address on the other address family, do you try to migrate?

I suspect we need to change the structure from what's in this PR, and if not, we need to nail down the critical use cases and make sure they all work.  

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