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How Do I Save Iptables Rules or Settings

30/10/2015 Comments off

save iptables rulesI am using GUI tool to setup firewall rules for my home computer connected to ADSL (DSL/Cable) network. However, after reboot my rules are not saved. Is there any way I can save and load all firewall rules again?

You need to use the iptables-save command, which is used to dump the contents of an IP Table in easily parseable format to screen. Using I/O-redirection provided by your shell you can save iptables firewall rules to a file.

To restore iptables rules use the iptables-restore command. It is used to restore an IP Tables from data specified from file. Use I/O redirection provided by your shell to read from a file.

Examples: Saving and Restoring Iptables Rules

In this example, save current iptables firewall rules to a file called /root/dsl.fw, enter:
# iptables-save > /root/dsl.fw

To restore iptables rules, enter:
# iptables-restore < /root/dsl.fw

To restore rules automatically upon Linux system reboot add following command to your /etc/rc.local file, enter:
# vi /etc/rc.local

Append the line:
/sbin/iptables-restore < /root/dsl.fw

Save and close the file. Please note that under Red Hat enterprise Linux (RHEL) / CentOS / Fedora Linux you can use following commands to save and restore firewall rules. To Save the rules to /etc/sysconfig/iptables file:
# /etc/init.d/iptables save

To restore the rules from /etc/sysconfig/iptables file:
# /etc/init.d/iptables start

If you are using Debian / Ubuntu Linux open /etc/network/interfaces:
# vi /etc/network/interfaces

Append the line to eth0 section:
post-up iptables-restore
Close and save the file. Reboot the system.

Source: nixCraft