IPFire is a free open source firewall and Linux distribution. It can be installed by burning the ISO image to a CD and booting from it. The installation process involves selecting keyboard layout and timezone, configuring the hostname and domain, setting passwords, and configuring the network interfaces. Typically there are two interfaces configured - a green LAN interface for the internal network, and a red WAN interface connected to the internet. The red interface requires configuration depending on the user's internet connection type and settings from their ISP. Once installed, IPFire can be managed through its web interface accessed at https://<ip address>:444.