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Problem

ip-tables is a firewall implemented by default in many Linux distributions.  However, by default, ip-table rules are not persistent - that is, rules will not survive reboots etc.

Solution

Below is one method for saving / restoring and making implemented ip-table rules persistent on several popular distributions of Linux.

Making iptables rules persistent

Amazon-Linux:

sudo chkconfig iptables on
sudo service iptables save

Debian/Ubuntu:

Install iptables-persistent package:

sudo apt-get install iptables-persistent

To save current iptable rules to these files, run the following:

sudo iptables-save > /etc/iptables/rules.v4
sudo ip6tables-save > /etc/iptables/rules.v6

Any ip-table rules added to below files will be persistent (on reboots etc.):

/etc/iptables/rules.v4
/etc/iptables/rules.v6 # for ip6 rules

You can reload from these files with to ip-tables by:

sudo iptables-restore < /etc/iptables/rules.v4
sudo ip6tables-restore < /etc/iptables/rules.v6

References

  1. https://help.ubuntu.com/community/IptablesHowTo
  2. https://www.thomas-krenn.com/en/wiki/Saving_Iptables_Firewall_Rules_Permanently

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