While FreeBSD 14 kernel is built by default with support for
TCP Fast Open (option TCP_RFC7413), it's only enabled on boot
for clients, not for servers.
As Knot uses TCP Fast Open, we need to explicitly enable it.
Solves the following issue:
Sep 3 18:35:18 dns-001 knot[81075]: warning: failed to enable TCP Fast Open on 178.32.70.109@53 (unknown system error)
References:
- tcp(4)