Activate iptables rules after reboot

List iptables rules:

iptables -L

Activate rules from file:

iptables-restore < iptables.rules

Save rules:

iptables-save > /etc/iptables.up.rules

These rules need to be restored when the network connection is going up.

touch /etc/network/if-pre-up.d/iptables
chmod +x /etc/network/if-pre-up.d/iptables

Add the following to /etc/network/if-pre-up.d/iptables:

#!/bin/sh
/sbin/iptables-restore < /etc/iptables.up.rules