CARP - [kernel-mode] OpenBSD CARP realization for Linux kernel 2.6.

http://tservice.net.ru/~s0mbre/old/?section=projects&item=carp

CARP is an improved version of the Virtual Router Redundancy Protocol (VRRP) standard. It has more features than Cisco’s HSRP. There is another[user-space] implementation called ucarp. This version does not compartable with OpenBSD CARP.