Persistent firewall in Ubuntu

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Use of normal iptables command in Ubuntu would cause firewall rules to not persist after reboot. For persistent firewall rules in Ubuntu use:

1. sudo apt-get update
2. sudo apt-get install iptables-persistent
3. Then to save current firewall rules to persist after reboot use:

   sudo invoke-rc.d iptables-persistent save

   The persistent files are saved in /etc/iptables/rules.v4 and /etc/iptables/rules.v6

Refer:

• https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-iptables-on-ubuntu-14-04
• http://www.microhowto.info/howto/make_the_configuration_of_iptables_persistent_on_debian.html

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