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+UCARP is a portable implementation of the CARP protocol.
+
+UCARP allows a couple 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 patents-bloated 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.