Date: Wed, 2 Sep 2015 01:30:48 -0400 From: Patrick Kelsey <pkelsey@freebsd.org> To: Rui Paulo <rpaulo@me.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, "jones@sdf.org" <jones@sdf.org>, "sara@sinodun.com" <sara@sinodun.com> Subject: Re: TCP Fast Open (RFC7413) for FreeBSD Message-ID: <AEE23E04-C0B7-40D3-B55C-502A41B0D5BE@freebsd.org> In-Reply-To: <1441169643.1183.12.camel@me.com> References: <CAD44qMVK82rB_MM_fsFt7LXV%2BuwCFj3%2B9BXXj=30teUQs0gzrg@mail.gmail.com> <1441169643.1183.12.camel@me.com>
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> On Sep 2, 2015, at 12:54 AM, Rui Paulo <rpaulo@me.com> wrote: >=20 >> On Tue, 2015-09-01 at 21:19 -0400, Patrick Kelsey wrote: >> Hi, >>=20 >> About two weeks from now, I will be starting work on server-side TCP=20 >> Fast >> Open (TFO) support for FreeBSD head and stable/10, with the intention=20 >> of >> having patches up for review by November. This message is an attempt=20 >> to >> uncover any existing work on TFO for FreeBSD, as the existence of=20 >> such work >> may change my plans. >>=20 >> Copying Sara Dickinson and Tom Jones due to this thread: >> https://lists.freebsd.org/pipermail/freebsd-net/2015 >> -January/040910.html. >=20 > Have you performed any measurements on the likelihood that stateful > packet inspectors (firewalls, NATs, etc.) will allow a SYN or a SYN/ACK > to pass with data in it? I have not performed any such measurements. This issue is discussed in sect= ion 7.1 of the RFC, which cites such studies and summarizes the finding as b= eing that 6% of the probed internet paths dropped SYN packets with data or w= ith unknown TCP options. >=20 > How would this interact with our syncache? Does it just need to store > the cookie? >=20 The exact interaction with the syncache is still TBD, but I do not expect to= be storing TFO cookies in the syncache as the cookies are per client-server= IP pair and not per-connection. -Patrick=
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