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Subject: Re: Does TCP_FASTOPEN actually work?
From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
In-Reply-To: <8f67a706-a650-bba2-a7dc-c25e676e1c97@degoeje.nl>
Date: Thu, 5 Jul 2018 20:33:07 +0200
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References: <8f67a706-a650-bba2-a7dc-c25e676e1c97@degoeje.nl>
To: Pieter de Goeje <pieter@degoeje.nl>
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> On 5. Jul 2018, at 17:23, Pieter de Goeje <pieter@degoeje.nl> wrote:
>=20
> I'm trying to test this new feature, but I have trouble getting the =
client to actually send a cached cookie. It keeps requesting new ones =
and as a consequence it never sends data in the initial SYN packet. =
Tcpdump shows that the server correctly replies to a cookie request with =
a cookie.
Can you provide a tracefile?
>=20
> Or am I misunderstanding how it should work and is the cookie cache =
per-process instead of system wide?
No, the cache is system wide. You can use
https://reviews.freebsd.org/D14554
to see the entries.
>=20
> I'm using the test programs from =
https://people.freebsd.org/~pkelsey/tfo-tools/ for this purpose.
How are you using the client and server?
>=20
> Server and client run on r335760 or later, with no changes to =
net.inet.tcp.fastopen except that server_enable was set to 1.
Is client_enable =3D 1?
>=20
> Related issue is that TCP_FASTOPEN is currently undocumented in =
tcp(4).
>=20
> - Pieter
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