Configuring iptables for start-up in debian

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Most probably there is no default iptables configuration file such as '/etc/sysconfig/iptables' of Cent-OS in debian. Hence to enable iptables on start-up a iptables configuration file can be created in /etc and then start-up configuration is done to restore the iptables configuration at start-up.

Steps for configuring start-up iptables on debian are:

1. iptables-save > /etc/iptables.up.rules
2. Edit '/etc/iptables.up.rules' and configure appropriate rules
3. Test with 'iptables-restore < /etc/iptables.up.rules'
4. Create '/etc/network/if-pre-up.d/iptables' with following contents:

   #!/bin/bash
   /sbin/iptables-restore < /etc/iptables.up.rules

   (Remove space from first column in both lines)

5. chmod +x /etc/network/if-pre-up.d/iptables

Steps learned from http://wiki.debian.org/iptables

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