Date: Thu, 5 Dec 2019 19:58:27 +0000 From: Jeremy Harris <jgh@wizmail.org> To: freebsd-transport@freebsd.org Subject: Re: TCP Fast Open Message-ID: <f07bb11e-4f69-b714-ce8d-881e68a20c6b@wizmail.org> In-Reply-To: <F24D850E-C6B6-4600-9B28-2439D70447A0@freebsd.org> References: <5276cc23-d37f-e55e-11c5-030314e9e32c@wizmail.org> <1206B1BE-3B7E-45D0-8C2B-6012A5CB6298@freebsd.org> <2752006b-cd6b-7b8b-d23b-ae2c794dc104@wizmail.org> <f59092f1-9f93-d5c3-e7a2-06ba88bd7385@wizmail.org> <F24D850E-C6B6-4600-9B28-2439D70447A0@freebsd.org>
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On 05/12/2019 19:43, Michael Tuexen wrote: > Are you asking how to figure out whether TFO was used or not? > In that case you can use > getsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, &on, &len); > If on == 0, TFO was not used, on != 0, TFO was used. I'd found that, but it's so far unclear what choices it makes among - didn't try TFO - tried TFO but the server didn't take it up - server accepted the TFO cookie, but not the data that was on the SYN - server acked the data -- Cheers, Jeremy
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