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NetFilter Checklist Building a NetFilterbased firewall is not difficult. End users interested in setting up their own NetFilter firewall can use the system to be used as the firewall. Install additional network interfaces (minimum number of required interfaces is two) | NetFilter Checklist Building a NetFilterbased firewall is not difficult. End users interested in setting up their own NetFilter firewall can use the following brief checklist Step 1. Select a system to be used as the firewall. Step 2. Install additional network interfaces minimum number of required interfaces is two . Step 3. Install at least the minimum recommended memory preferably more if the firewall will be providing more than just filtering services . Step 4. Select a Linux version to install Debian Fedora Core Red Hat Gentoo and so on . Step 5. Install the operating system. Step 6. Configure the operating system assign addresses to interfaces either by using Dynamic Host Configuration Protocol DHCP or static assigned addresses . Step 7. Define which services will be allowed through the firewall. Step 8. Define which hosts will be translated by the firewall. Step 9. Using the iptables utility Firewall Builder Firestarter Webmin or another utility create the firewall filter ruleset. Step 10. Apply the ruleset to the external interface that is the public interface of the firewall. Step 11. Test connectivity through the firewall. Step 12. If desired define what outbound traffic is to be filtered. Step 13. Apply the outbound filter to the internal interface of the firewall. Step 14. Retest connectivity through the .
