What is carp?

[browndawg74]

Can someone explain what Carp is?

[hoba]

Demonstration of what it does:
http://pfsense.com/mirror.php?section=tutorials/carp/carp_failoversim.htm

How to set it up:
http://pfsense.com/mirror.php?section=tutorials/carp/carp-cluster-new.htm
http://doc.pfsense.org/index.php/Setting_up_CARP_with_pfSense

Technical Info:
http://www.openbsd.org/faq/pf/carp.html
http://www.countersiege.com/doc/pfsync-carp/