Simple chain to ban ip addresses

Iptables Ban

#!/bin/bash

BANFILE='/root/banned'

iptables -N BANNED
if [ -f ${BANFILE} ]; then
    for IP in `sort -ru ${BANFILE}`; do
        iptables -A BANNED -s ${IP} -j DROP
    done
fi
iptables -A BANNED -j RETURN

iptables -A INPUT -i eth0 -m state --state NEW -j BANNED