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Previous and Related Work Mobile IPv4 Triangular routing Optimizations require host-to-host IP tunneling Foreign Agent and Home Agent Registrations Care-of-Address No support for Mobile Routers Mobile IPv6 Triangular routing Optimizations require a return routability procedure, IPv6 routing header and heavy security Home Agent Registrations Micro-Mobility with HMIP Basic support for Mobile Routers with NEMO MPLS Micro-Mobility Triangular routing Extension of Mobile IPv4/v6 Home Agent Registrations Multiple registrations with MPLS routers Heavy use of signaling during original registration and during the hand-off |