carp(4) and ospfd possible configuration # global configuration router-id 0.0.0.2 # areas area 0.0.0.0 { auth-type crypt auth-md 1 "L&Y6)@Vc(6I4=Gq" auth-md 2 "IsJ_-LE:al17a" auth-md-keyid 1 # main link interface fxp1 { demote carp } # announce local LAN via carp interface carp0 } That's the full ospfd config!