6 Best Open Source Firewall Solutions

Security is paramount. Security involves defense in depth. Approaching security one step at a time, with consistency and rigour, you can mitigate threats, and keep intruders at bay.

pfSense Powerful firewall and routing platform based on FreeBSD
ClearOS Dedicated firewall and Internet server/gateway
Untangle Quality open source alternative to SonicWALL and WatchGuard
IPFire Distro with a versatile and state of the art firewall engine
Smoothwall Express Firewall with its own security-hardened Linux distro
Shorewall High-level tool for configuring Netfilter