Bashscripts.org

Firewalls all good and fun, but what do you do when you need to make rapid, complex changes to your netfilter-based firewall? Instead of feverishly hacking away at a complex master firewall script, use the dynfw Dynamic Firewall Tools. This collection of robust bash scripts have been designed to work with nearly any existing netfilter-based firewall configuration. By using these scripts, you'll be able to make near-immediate changes to your firewall configuration without risk of misconfiguration, resulting in vastly improved network security and responsiveness.