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Date:      Thu, 5 Dec 2019 15:25:26 +0000
From:      Jeremy Harris <jgh@wizmail.org>
To:        freebsd-transport@freebsd.org
Subject:   TCP Fast Open
Message-ID:  <5276cc23-d37f-e55e-11c5-030314e9e32c@wizmail.org>

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Hi,

12.1 kernel with TCP_RFC7413
net.inet.tcp.fastopen.server_enable: 1
net.inet.tcp.fastopen.client_enable: 1


Using code copied from
  https://people.freebsd.org/~pkelsey/tfo-tools/tfo-client.c

I'm not seeing any TFO option on SYN.  This is on a loopback
connection.

Also, it appears to make no difference to the success of the
sendto whether or not TCP_FASTOPEN was set on the socket, adding to
the confusion.

What might I be doing wrong?
-- 
Cheers,
  Jeremy



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