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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
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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In-Reply-To: <1762E7D4-DD53-4810-ADA9-3FDE6B270ACF@gmail.com>
References: <364514D5-07F2-4388-A2CD-35ED1AE38405@akamai.com> <4aff6353-eb0d-b0b8-942d-9c92753f074e@bobbriscoe.net> <D13294C4-105C-4F58-A762-6911A21A18C6@akamai.com> <CAH8sseSQaCbknok--hf=DgwzCs3OnnkKjPy5bdLgnzjq7-+c_w@mail.gmail.com> <ce4b1e2d-3bc8-265c-6bcd-5a26b4dd89e9@bobbriscoe.net> <1238A446-6E05-4A55-8B3B-878C8F39FC75@gmail.com> <AM4PR07MB3459B1173917DAFBCEB25511B9FA0@AM4PR07MB3459.eurprd07.prod.outlook.com> <17B33B39-D25A-432C-9037-3A4835CCC0E1@gmail.com> <AM4PR07MB345956F52D92759F24FFAA13B9F50@AM4PR07MB3459.eurprd07.prod.outlook.com> <52F85CFC-B7CF-4C7A-88B8-AE0879B3CCFE@gmail.com> <AM4PR07MB3459B471C4D7ADAE4CF713F3B9F60@AM4PR07MB3459.eurprd07.prod.outlook.com> <D231681B-1E57-44E1-992A-E8CC423926B6@akamai.com> <AM4PR07MB34592A10E2625C2C32B9893EB9F00@AM4PR07MB3459.eurprd07.prod.outlook.com> <A6F05DD3-D276-4893-9B15-F48E3018A129@gmx.de> <AM4PR07MB3459487C8A79B1152E132CE1B9CB0@AM4PR07MB3459.eurprd07.prod.outlook.com> <87ef2myqzv.fsf@taht.net> <a85d38ba-98ac-e43e-7610-658f4d03e0 f4@mti-systems.com> <CE03DB3D7B45C245BCA0D243277949363062879C@MX307CL04.corp.emc.com> <803D9CA8-220E-4F98-9B8E-6CE2916C3100@gmail.com> <1468777263.2671021.1563730029999@mail.yahoo.com> <1762E7D4-DD53-4810-ADA9-3FDE6B270ACF@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tcpm/GqlGJEg3pvSeI2u6iNQmaJGlqkU>
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

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