Re: [quicwg/base-drafts] disable_active_migration with SPA (#3765)

Igor Lubashev <> Wed, 17 June 2020 16:23 UTC

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Date: Wed, 17 Jun 2020 16:23:45 +0000
From: Igor Lubashev <>
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Subject: Re: [quicwg/base-drafts] disable_active_migration with SPA (#3765)
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Thanks for the analysis, @kazuho.  The case I described could, indeed, involve a simple 4-tuple legacy load balancer in front of QUIC-supporting backends.  But it could also involve a QUIC-aware load balancer and still benefit from SPA for improved reliability and performance (removal of one more system with its failure modes and removal of some internal forwarding step within a deployment).

And then there is still another case -- using an anycast address as the handshake address and landing on a server deep inside your provider network.  You will want to use SPA to avoid a risk of anycast route change during a long-lived connection.  But you do not want the client with a secondary connection to another provider trying to migrate.

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