Re: [quicwg/base-drafts] Revalidation for ECN (#4037)

Martin Thomson <> Mon, 24 August 2020 11:03 UTC

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Date: Mon, 24 Aug 2020 04:03:37 -0700
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Revalidation for ECN (#4037)
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@martinthomson commented on this pull request.

> @@ -3892,6 +3889,7 @@ errors are detected.
 Endpoints validate ECN for packets sent on each network path independently.  An
 endpoint thus validates ECN on new connection establishment, when switching to a
 server's preferred address, and on active connection migration to a new path.
+If validation fails, an endpoint could also periodically attempt validation.

This appears immediately above:

> It is possible for faulty network devices to corrupt or erroneously drop packets with ECN markings.  To provide robust connectivity in the presence of such devices, each endpoint independently validates ECN counts and disables ECN if errors are detected.

This would seem to suffice.

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