Patent ID: 7280557
Filing Date: 2007-10-09
Classification: H04L

Abstract:
1. A method for routing traffic in a data network, the data network including a public network and a private network, the private network including a plurality of routers adapted to provide connectivity between nodes in the private network and nodes in the public network, the plurality of routers including at least one active router adapted to perform network address translation (NAT) for traffic flowing between the public and private networks, the plurality of routers further including at least one standby router adapted to provide failover capability for the at least one active router, the method comprising: receiving at a first router of the plurality of routers a first packet relating to a first flow between a private network node and a public network node; associating the first flow with a first NAT entry; starting a first timeout timer associated with the first NAT entry; and sending a Delete Query message to at least one second router of the plurality of routers in response to detecting that the first timeout timer has expired so as to query the at least one second router for selected information relating to the first NAT entry.