Date: Thu, 5 Jul 2018 20:33:07 +0200 From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de> To: Pieter de Goeje <pieter@degoeje.nl> Cc: freebsd-net@freebsd.org Subject: Re: Does TCP_FASTOPEN actually work? Message-ID: <9B19385C-CBD4-4C12-9E84-E12CAAF23092@lurchi.franken.de> In-Reply-To: <8f67a706-a650-bba2-a7dc-c25e676e1c97@degoeje.nl> References: <8f67a706-a650-bba2-a7dc-c25e676e1c97@degoeje.nl>
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> On 5. Jul 2018, at 17:23, Pieter de Goeje <pieter@degoeje.nl> wrote: > > 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? > > 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. > > 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? > > 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 = 1? > > Related issue is that TCP_FASTOPEN is currently undocumented in tcp(4). > > - Pieter > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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