Re: [quicwg/base-drafts] ACK of non-existent packet is illegal (#2302)

Martin Thomson <> Mon, 07 January 2019 22:57 UTC

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Date: Mon, 07 Jan 2019 22:57:34 +0000
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] ACK of non-existent packet is illegal (#2302)
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martinthomson commented on this pull request.

>  acknowledgment of its ACK frames, with the knowledge this could cause the sender
 to unnecessarily retransmit some data.  Standard QUIC {{QUIC-RECOVERY}}
 algorithms declare packets lost after sufficiently newer packets are
 acknowledged.  Therefore, the receiver SHOULD repeatedly acknowledge newly
 received packets in preference to packets received in the past.
+An endpoint SHOULD treat receipt of an acknowledgment for a packet it did not
+send as a connection error of type PROTOCOL_VIOLATION, if it is able to detect

How so?  It should never happen...

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