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