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Re: [quicwg/base-drafts] QUIC connection migration and IPv6 only NAT64/DNS64 Networks (#2122)

David Schinazi <notifications@github.com> Thu, 13 December 2018 17:59 UTC

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Subject: Re: [quicwg/base-drafts] QUIC connection migration and IPv6 only NAT64/DNS64 Networks (#2122)
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I agree with @plakhera ,  this is an important issue, and will be increasingly common as more cellular carriers switch to IPv6-only. At Google we've been seeing some number of as-yet unexplained connection migration failures, and our working hypothesis is address family mismatch. I think this does work with the concept of `preferred_address`. If a QUIC server deployment uses anycast IPs for initial packets then asks the client to switch to an address that uniquely identifies this server, why constrain the client to one address family? If the client used a variant of Happy Eyeballs, it could have ended up connecting using IPv4 even though it prefers IPv6. Sending both address families in `preferred_address` allows the client to switch back to the best address family.

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