Hello,
some basic commands to handle a ruleset of iptables.
To dump all active iptables rules to the console rules use
root@debdev:~ # iptables-save
If you want to load these rules on demand, save all rules in file of your home
root@debdev:~ # iptables-save > ~/firewall.rules
To reload all rules on demand use the following command
root@debdev:~ # iptables-restore < ~/firewall.rules
If your rules should survive a system restart, install the package iptables-persistent and write the output of the save command to a file /etc/iptables/rules.v4
root@debdev:~ # apt-get install iptables-persistent
root@debdev:~ # iptables-save > /etc/iptables/rules.v4
Michael