Title : CARP Ported to NetBSD 
Date : 2006-05-19 
Code : <a href="http://www.netbsd.org/" target="blank">NetBSD</a>'s Liam J. Foy has ported <a href="http://en.wikipedia.org/wiki/Cache_Array_Routing_Protocol" target="blank">CARP</a> from OpenBSD and <a href="http://mail-index.netbsd.org/current-users/2006/05/18/0005.html" target="blank">committed it into NetBSD-current</a>. CARP is a secure, free alternative to the Virtual Router Redundancy Protocol and the Hot Standby Router Protocol. CARP works by allowing a group of hosts on the same network segment (known as 'redundancy group') to share an IP address, and in the event that the master host suffers a failure, the IP will move to one of the backups hosts and the service will continue unaffected. 
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