To make iptables rules permanent, we need to save them to a configuration files and ensure they are restored on each boot. The following assumes that the current rules enabled are those to be made permanent. Save current rules to config file
sudo sh -c "iptables-save > /etc/iptables.conf"
Edit /etc/rc.local as root and add the following
# Load iptables rules from config file
iptables-restore < /etc/iptables.conf