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Re: [tcpm] I-D Action: draft-nishida-tcpm-agg-syn-ext-00.txt

Joe Touch <touch@strayalpha.com> Mon, 08 February 2021 22:42 UTC

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From: Joe Touch <touch@strayalpha.com>
In-Reply-To: <YCG4EQ9BCAvucdN1@sorcerer.cms.waikato.ac.nz>
Date: Mon, 08 Feb 2021 14:42:49 -0800
Cc: "Scheffenegger, Richard" <rs.ietf@gmx.at>, "tcpm@ietf.org Extensions" <tcpm@ietf.org>
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References: <YCG4EQ9BCAvucdN1@sorcerer.cms.waikato.ac.nz>
To: Matthew Luckie <mjl@caida.org>
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Subject: Re: [tcpm] I-D Action: draft-nishida-tcpm-agg-syn-ext-00.txt
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That sounds like a very serious bug. It would be important to get it fixed before we all waste time trying to adapt to it. 

Joe

> On Feb 8, 2021, at 2:16 PM, Matthew Luckie <mjl@caida.org> wrote:
> 
> Hi Richard,
> 
>> On Mon, Feb 08, 2021 at 10:46:45PM +0100, Scheffenegger, Richard wrote:
>> Hi Yoshi,
>> 
>> Sorry to nitpick - in your draft, you mention that some hosts reflect
>> back unknown tcp options, which is why you are using different GID
>> mappings between SYN and SYN,ACK.
>> 
>> I did read about this behavior concerning TCP header flags / reserved
>> bits - but have not come across a paper where this behavior is described
>> for unknown TCP options (or I may have missed that aspect in the various
>> studies around TCP option investigations done by MPTCP and other groups).
> 
> There is some discussion of systems that seem to reflect TCP options here:
> 
> http://blog.multipath-tcp.org/blog/html/2018/12/19/which_servers_use_multipath_tcp.html
> 
> Matthew_______________________________________________
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