Free Network-based Firewalls
Firewalls are designed for both a single computer and a network. Host-based Firewall and Network-based Firewall. A network-based firewall could be a hardware, application, or both. A network-based firewall can be installed on the administrator’s system to monitor incoming and outgoing activities between computers in the network.
Best Free Network-based Firewalls for Windows & Unix
The following free network-based firewall:
1. pfSense
An open-source security solution with a custom kernel based on FreeBSD OS. pfSense is one of the leading network firewalls with a commercial level of features.
pfSense is a hardware device, virtual appliance, and downloadable binary (community edition).
2. IPFire
IPFire is built on top of Netfilter and is trusted by companies worldwide.
3. OPNSense
OPNSense is a fork of pfSense and m0n0wall. GUI is available in multiple languages.
4. NG Firewall
NG Firewall by untangle is a single platform where you can get everything you need to protect your organization network.
5. Smoothwall
Smoothwall Express is a free solution with a simple web interface to configure and manage the firewall.
6. ufw
UFWÂ (uncomplicated firewall) works with Ubuntu. It provides a command line interface to manage the Linux kernel packet filtering system (netfilter).
7. csf
CSF (ConfigServer security) is supported and works on many OS and virtual servers. CSFÂ is a stateful firewall, login detection, and security solution for Linux servers.