http://distrowatch.com/pfsense
http://en.wikipedia.org/wiki/Pfsense
http://www.howtoforge.com/how-to-use-pfsense-to-load-balance-your-web-servers
http://www.howtoforge.com/how-to-configure-a-pfsense-2.0-cluster-using-carp
Voir aussi
FreeBSD
http://opensourceforu.com/2016/09/pfsense-adding-firewall-rules-to-filter-services
http://www.linuxjournal.com/content/pfsense-not-linux-not-bad