Usage - Carp and ospfd carp - Common Address Redundancy Protocol ospfd - routing daemon using network redundancy for re-routing conflicts! ... but very powerful if used correctly Impossible to run OSPF on a carp interface Instead use carp to connect a LAN with servers to an OSPF cloud more than one ospf router default gateway on servers is carped and does not change Use a "passive" carp interface and multiple ethernet interfaces to connect router to the OSPF cloud; link-state of carp interface is tracked route in the OSPF cloud will always point to the active carp interface