Hi,
To be able to load your iptables ruled every time your Linux system is restarted just follow these commands.$ sudo iptables-save /etc/firewall.conf
Open /etc/network/if-up.d/iptables and add:
#!/bin/sh
iptables-restore /etc/firewall.conf
Provide executable permission:$ sudo chmod +x /etc/network/if-up.d/iptable
Now, your iptable rules will be loaded every time your Linux box is booted.
If you need to modify your rules just execute:$ sudo iptables-save /etc/firewall.conf
Regards,
Rubén