REQUIREMENTS PRE-INSTALL * This port depends on having netfilter enabled in the kernel POST-INSTALL * Add the SSHD chain to your firewall setup: iptables -N SSHD * Add a jump to SSHD rule: iptables -A INPUT -p tcp -m tcp --dport 22 -j SSHD * Store your new iptables rules somewhere persistent * To start sshd with filtering, use /etc/rc.d/sshdfilter instead of /etc/rc.d/sshd PRECAUTION