Re: [tcpm] [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-00.txt

"alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk> Sun, 21 July 2019 19:52 UTC

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Date: Sun, 21 Jul 2019 19:52:37 +0000 (UTC)
From: "alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk>
Reply-To: "alex.burr@ealdwulf.org.uk" <alex.burr@ealdwulf.org.uk>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>, "tcpm@ietf.org" <tcpm@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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Subject: Re: [tcpm] [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-00.txt
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 On Sunday, July 21, 2019, 6:48:49 PM GMT+1, Jonathan Morton <chromatix99@gmail.com>; wrote:

> AccECN goes through a negotiation on the SYN and SYN-ACK phases before its use of
> NS/CWR/ECE bits is changed.  This is very important.  SCE's revised use of the NS bit
> comes into play only after that negotiation has established (to an
> AccECN-aware endpoint) that Classic ECN is in use.  This is actually similar to the
> old Nonce Sum spec, which the AccECN draft still seems to believe is current.

Ah, right. For some reason I was assuming that to be compatible with AccECN, you'd need to use one of the NS=1 codepoints of NS/CWR/ECE to signal your use of NS. But of course, you don't need to do that, so it is compatible as it stands. Thanks!
Alex