Patent ID: 7961595
Filing Date: 2011-06-14
Classification: H04L,H04W

Abstract:
1. A network control apparatus that maintains a connection between a local network and a global network and that has a plurality of interfaces, the network control apparatus comprising: a failure detection section that detects a failure of packet transmission executed using a first interface of the plurality of interfaces, the first interface having a connection route to the global network; a search section that searches for a second interface from the plurality of interfaces when the failure is detected; an execution section that executes packet transmission using the searched interface instead of the first interface; and a multi-homing detection section that detects whether or not the network control apparatus is multi-homed, wherein: when the network control apparatus is not multi-horned, the search section searches for an alternative apparatus having the connection route to the global network and belonging to the local network, and determines an ingress interface of the plurality of interfaces as the second interface, the ingress interface having a connection route to the searched alternative apparatus, when the network control apparatus is multi-homed, the search section searches for an alternative egress interface having the connection route to the global network from the plurality of interfaces, and determines the alternative egress interface as the second interface, and the searched section further comprises a registration section that transmits a registration request of a binding between a global address of the first interface as a permanent address and an address of the second interface as a temporary address in the network control apparatus, from the second interface to a node external to the local network.