Re: [quicwg/base-drafts] ECN verification text (#2752)

Martin Thomson <> Wed, 07 August 2019 02:03 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] ECN verification text (#2752)
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martinthomson commented on this pull request.

> -setting ECT codepoints in subsequent packets.  Doing so allows the connection to
-be resilient to network elements that corrupt ECN codepoints in the IP header or
-drop packets with ECT or CE codepoints in the IP header.
+#### Validation Outcomes
+If validation fails, then the endpoint stops sending ECN markings in subsequent
+IP packets with the expectation that either the network path or the peer does
+not support ECN.
+Upon successful validation, an endpoint can continue to set ECT codepoints in
+subsequent packets with the expectation that the path is ECN-capable.  Network
+routing and path elements can change mid-connection however; an endpoint MUST
+disable ECN if validation fails at any point in the connection.
+Even if validation fails, an endpoint MAY re-validate ECN on the same path to
+the peer at any later time in the connection.

That would be confusing.  ECN validation is performed on a per-path basis.

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