Re: [quicwg/base-drafts] Backoff on CONNECTION_CLOSE (#3157)

Kazuho Oku <> Tue, 29 October 2019 00:37 UTC

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Date: Mon, 28 Oct 2019 17:37:42 -0700
From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] Backoff on CONNECTION_CLOSE (#3157)
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kazuho commented on this pull request.

> +closing state.
+During the closing period, an endpoint that sends a CONNECTION_CLOSE frame
+SHOULD respond to any incoming packet that can be decrypted with another packet
+containing a CONNECTION_CLOSE frame.  Such an endpoint SHOULD limit the number
+of packets it generates containing a CONNECTION_CLOSE frame.  For instance, an
+endpoint could progressively increase the number of packets that it receives
+before sending additional packets or increase the time between packets.
+An endpoint is allowed to drop the packet protection keys when entering the
+closing period ({{draining}}).  However, an endpoint without the packet
+protection keys cannot identify and discard invalid packets.  To avoid creating
+an unwitting amplification attack, such endpoints MUST reduce the frequency with
+which it sends packets containing a CONNECTION_CLOSE frame.
+To minimize the state that an endpoint maintains for a closing connection,

Nice catch! Adopted in 15898c5.

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