pfSense OS : Distro for Internet Cafe

pfSense is an open source customized distribution of FreeBSD tailored for use as a firewall and router. More intriguingly, it natively includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution. Here is network diagram for pfSense ideally,

[ref : http://www.linuxthai.org/installpfsense1.html]