To flush existing iptables rules

# vi stop.fw4

#!/bin/sh
echo "Stopping firewall and allowing everyone..."
# Delete and flush. Default table is "filter". Others like "nat" must be explici# tly stated.
iptables -F
iptables -X
iptables --delete-chain
iptables -t nat -F
iptables -t nat -X
# Delete all chains that are not in default filter and nat table
iptables --table nat --delete-chain
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
chmod +x stop.fw4
./stop.fw4