Firewalls
A firewall is a hardware or software solution to enforce security policies. In the physical security analogy, a firewall is equivalent to a door lock on a perimeter door or on a door to a room inside of the building - it permits only authorized users such as those with a key or access card to enter. A firewall has built-in filters that can disallow unauthorized or potentially dangerous material from entering the system. It also logs attempted intrusions.
From : www.tecrime.com/0gloss.htm
pfSense
pfSense is a open source firewall derived from the m0n0wall operating system platform with radically different goals such as using OpenBSD's ported Packet Filter, FreeBSD 6.1 ALTQ (HFSC) for excellent packet queueing and finally an integrated package management system for extending the environment with new features.
pfSense has packaging functionality that allows nearly limitless expandability of functionality. In addition pfSense features mulitple WAN support, CARP Clustering, and much more.
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pfSense
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