https://nileshgr.com/2013/04/18/securing-freebsd-server-with-fail2ban-and-ipfw
→ bsd-ipfw で同じことができる。
https://forums.freebsd.org/threads/52107/
cat /usr/local/etc/fail2ban/jail.d/sshd-ipfw.conf [sshd-ipfw] enabled = true filter = bsd-sshd action = bsd-ipfw[table=0] logpath = %(sshd_log)s maxretry = 5
参考
Fail2banを利用するための備忘録 [FreeBSD](fkimura.com)
