From owner-freebsd-net@freebsd.org  Tue Jan 31 15:53:17 2017
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To: freebsd-net@freebsd.org
From: Sergey Matveychuk <sem33@yandex-team.ru>
Subject: TCP_FASTOPEN is absent in GENERIC
Message-ID: <bdad8788-6086-7bdf-232b-a71908f56ae8@yandex-team.ru>
Date: Tue, 31 Jan 2017 18:53:13 +0300
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Hi.

Is there a strong reason for option TCP_FASTOPEN is absent in GENERIC 
kernel? It's off by default anyway (net.inet.tcp.fastopen.enabled=0).

Latest dns/bind* versions want it very much.