Reset Iptables

reset_iptables is a simple Bash script to reset iptables--clear the existing firewall rules.  reset_iptables sources from the reset_iptables_programs.cfg file.

#!/bin/bash

if [ ! -x /usr/sbin/iptables ]; then
    die "iptables: can't execute /usr/sbin/iptables"
fi

/usr/sbin/iptables -P INPUT   DROP
/usr/sbin/iptables -P OUTPUT  DROP
/usr/sbin/iptables -P FORWARD DROP
/usr/sbin/iptables -F
/usr/sbin/iptables -X

for table in filter nat mangle; do
    /usr/sbin/iptables -t $table -F
    /usr/sbin/iptables -t $table -X
    /usr/sbin/iptables -t $table -Z
done

For more examples, see Samples.