Patent ID: 7729312

Claim:
A router apparatus used in an IPv6 multihome network and capable of exchanging a network prefix as route information with an adjacent router, the router apparatus comprising: a communication unit configured to establish a connection between the router apparatus and one of multiple Internet service providers in the IPv6 multihome network; a pair information generator configured to associate a prefix assigned from the network with a default route to generate a pair information item; a routing protocol processor configured to exchange the pair information item of the prefix and the associated default route with the adjacent router using a routing protocol; and a routing table configured to set an address generation availability bit which indicates whether an address is to be generated using the prefix and a default route availability bit which indicates whether the pair information item is available as a default route, wherein the routing protocol processor is configured to read the address generation availability bit and the default route availability bit from the routing table, enter the default route in the routing table when the default route availability bit is a first predetermined value, and enter the address in the routing table when the address availability bit is a second predetermined value.