Routing apparatus and method for 6to4 network

This invention relates to a routing apparatus and to a routing method in a network system in which a 6to4 network is connected to a native IPv6 network. An optimum transmission route is selected by considering the topology of the 6to4 network and the topology of the native IPv6 network. One embodiment of the routing apparatus comprises an information collector, a message generator and a message transmitter. Another embodiment of the routing apparatus comprises a routing information collector, a message receiver, and a route selector. The network system comprises a 6to4 relay router and a 6to4 router. The method comprises collecting routing information of the native IPv6 network and the 6to4 network, respectively, and selecting the route based on the collected information. Finally, a message used for transmitting the routing information comprises a Border Gateway Protocol (BGP) update message.