Flushing IPTables rule and allow all traffic for Debian or Ubuntu

Flushing all iptables chain rules shell script

#!/bin/sh
echo "Stopping IPv4 firewall and allowing everyone..."
ipt="/sbin/iptables"
## Failsafe - die if /sbin/iptables not found
[ ! -x "$ipt" ] && { echo "$0: \"${ipt}\" command not found."; exit 1; }
$ipt -P INPUT ACCEPT
$ipt -P FORWARD ACCEPT
$ipt -P OUTPUT ACCEPT
$ipt -F
$ipt -X
$ipt -t nat -F
$ipt -t nat -X
$ipt -t mangle -F
$ipt -t mangle -X
$ipt -t raw -F
$ipt -t raw -X

Make sure you can execute the script using the chmod command:

# chmod +x /root/fw.stop

Run the script as root user:

# /root/fw.stop

Verify that my firewall rules are flushed out?

Type the following iptables command:

# iptables -L -n -v

Sample outputs:

Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination