Interface selection in a moving network

It is the method of establishing the traffic route for the mobile network node which attached to the mobile router, and the above-mentioned mobile router has a plurality of upstream interfaces which can use self. A method includes the process of transmitting the identifier of an interface mapped by an IPv6 traffic class or the four services of IPv (s) type, and the characteristic of the interface to a mobile network node from a mobile router. In the case of IPv6, an identifier may be contained in the router advertisement message which a mobile router broadcasts. In a mobile network node, an interface is chosen based on the characteristic of the identified interface. The traffic class of a predetermined sending-out packet or the service type field at least contains the identifier of the selected interface. Typically in a mobile router, routing of the packet is carried out using the rule generated according to detection of the traffic class value in a packet header via the interface corresponding to the identifier contained in the traffic class or service type field. [Chosen drawing] Drawing 1