====== Restore iptables after reboot ======

  iptables-save > /etc/iptables.conf

Add to eth0 in /etc/network/interfaces

  pre-up iptables-restore < /etc/iptables.conf

====== Drop example ======
  iptables -A INPUT -p tcp -m tcp --dport 111 -j DROP
  iptables -A INPUT -p udp -m udp --dport 111 -j DROP