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

Kazuho Oku <> Tue, 14 July 2020 02:17 UTC

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Date: Mon, 13 Jul 2020 19:17:14 -0700
From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] disable_active_migration with SPA (#3765)
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> The issue is telling the client that it should avoid changing the source address/network attachment (active client migration) during a connection while still allowing for SPA (destination address change). Is that what you agree with?

I understand that that is the issue that you are discussing alongside disabling migration after the client moves to the preferred address. I think we agree at least that they are "technically" orthogonal issues.

> Before the change in `disable_active_migration` semantics, `disable_active_migration` was such a signal. Now, there is not one.

Thanks. I now understand your view, but I wonder if that has ever been the intent of the text. The counterexample is that we have intentionally allowed servers to provide a preferred address using a different address family than the original address. Wouldn't it be more natural to assume that the existing text regarding a MUST NOT for changing the client address (when the disable_active_migration TP was used) was written under the assumption that server_preferred address was not used in such case?

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