Re: [quicwg/base-drafts] 5-tuple routing and SPA (#3608)

[Kazuho Oku <[e-mail]>]

@MikeBishop 
>> Per-definition, server-preferred address is an address that is capable of receiving packets from any address.
> 
> I don't think this is necessarily true, though I agree that we're talking about smaller and smaller fractions of server space.

While I agree that it might not necessarily be true at the moment, I might argue that it is going to be true.

The basis of the resolution for #3559 and #3565 (both on consensus call) is that servers using preferred address would not be using the server's address for distinguishing between connections. We also know that a server cannot use client's address (unless there is out-of-band knowledge), because clients are not required to use the same 2-tuple when migrating to a different address (and also because there are NATs).

The outcome is that the server has to rely on CID when using SPA. And therefore I might insist that servers using SPA would always be capable of handling further migration.

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