Log Message:
Initial import of ucarp-1.0 from pkgsrc-wip.

UCARP allows a pair of hosts to share common virtual IP addresses in order to 
provide automatic failover. It is a portable userland implementation of the 
secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD's 
alternative to the VRRP).

Strong points of the CARP protocol are : very low overhead, cryptographically 
signed messages, interoperability between different operating systems and no 
need for any dedicated extra network link between redundant hosts.