How to save rules of the iptables? [duplicate]

I create the rules to iptables. But, when I restart the computer, the rules don't work! How to save the rules on Ubuntu ?

The was problem solved!

do:

After of the write the commands iptables, do:

 1. sudo su
 2. iptables-save > /etc/iptables.rules
 3. In /etc/network/if-pre-up.d/iptables,put:

 #!/bin/sh
 iptables-restore < /etc/iptables.rules
 exit 0

 4. After, in /etc/network/if-post-down.d/iptables,put:
 #!/bin/sh
 iptables-save -c > /etc/iptables.rules
 if [ -f /etc/iptables.rules ]; then
 iptables-restore < /etc/iptables.rules
 fi
 exit 0
 5. After, give permission to the scripts:
 sudo chmod +x /etc/network/if-post-down.d/iptables
 sudo chmod +x /etc/network/if-pre-up.d/iptables

More information: https://help.ubuntu.com/community/IptablesHowTo#Saving_iptables Good luck!

Solution 1:

The easy way is to use iptables-persistent.

Install iptables-persistent:

sudo apt-get install iptables-persistent

After it's installed, you can save/reload iptables rules anytime:

sudo /etc/init.d/iptables-persistent save 
sudo /etc/init.d/iptables-persistent reload

Ubuntu 16.04 Server

The installation as described above works without a problem, but the two commands for saving and reloading above do not seem to work with a 16.04 server. The following commands work with that version:

sudo netfilter-persistent save
sudo netfilter-persistent reload

Solution 2:

The generic method of saving iptables rules is to use the command iptables-save, which writes to stdout.

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

The output created by iptables-save can then by read on stdin by iptables-restore. If on a server, without NetworkManager, a common approach is then to use a pre-up command in /etc/network/interfaces.

iface eth0 inet static
        ....
        pre-up iptables-restore < /etc/network/iptables.rules

If you are using NetworkManager it should be possible to run the same command from a script created under /etc/NetworkManager/dispatcher.d/. In the Community Documentation - iptables howto, see Configuration on Startup for NetworkManager for more information.

Do note that the commands iptables, iptables-save and iptables-restore are IPv4 only. For IPv6 traffic the equivalent commands are ip6tables, ip6tables-save and ip6tables-restore.