Launch gedit

Create a shell script (iptables_flush.sh) and copy paste the following lines:

 #!/bin/sh
echo “Flushing iptables rules…”
sleep 1
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

save as:  iptables_flush.sh in root

Make the file executable

chmod +x iptables_flush.sh

and run the script:

./iptables_flush.sh