Abstract: A method of achieving route optimization (RO) when a dual capable mobile Internet protocol version 6 (MIPv6) mobile node is connected with an IPv4-only network allows RO of packets to traverse a shorter route than the default one through the home agent (HA) using bidirectional tunneling, and leads to better bandwidth utilization. The method of RO with a dual MIPV6 node in an IPV4-only network includes updating the HA with an IPv4 address of the MN and deregistering a binding update (BU) with a corresponding node (CN) via the HA; informing the CN about its IPv4 address and receiving the CN's IPv4 address in reply; checking reachability of the CN in its IPv4 address using an IPv6-in-IPv4 tunnel; and sending and receiving Ipv6 data packets to/from the CN using a v4 tunnel.

Abstract: A method for route optimization with a dual mobile IPv4 node in an IPv6-only network is provided. The method includes the operations of: receiving a visited IPv6 address from a router when the dual mobile node is connected to the IPv6-only network; updating a home agent with the IPv6 address; deregistering a binding update with a correspondent node via the home agent; updating the correspondent node with an IPv6 address; checking the reachability of packets directly to the correspondent node using its IPv6 address; the mobile node starting sending, to the CN, data packets tunneled in an IPv6 packet once the reachability is verified; and the correspondent node sending tunneled data packets directly to an IPv6 address of the mobile node.