Patent ID: 7725600
Filing Date: 2010-05-25
Classification: H04L,H04W

Abstract:
1. A method to manage addresses in a network, comprising: when connecting a mobile router (MR) of a mobile network (MONET) to an access point (AP) of an access network (AN) that includes an Access Router (AR), sending a first neighbor advertisement from a mobile network node (MNN) to the MR, the first neighbor advertisement comprising a care of address (CoA) and a link layer address (LLA) of the MNN within the MONET; based on the first neighbor advertisement, constructing a first neighbor cache in the MR that associates the CoA with the LLA; sending a second neighbor advertisement from the MR to the AN on behalf of the MNN, the second neighbor advertisement comprising a mapping between the CoA of the MNN and a LLA of the MR (LLA_MR); based on the second neighbor advertisement, constructing a second neighbor cache in the AR that associates the CoA with the LLA_MR; in response to an arrival at the AR of a downlink packet having a CoA in an IP layer destination address field, checking, by the AR, the second neighbor cache using the CoA to obtain the associated LLA_MR of the MR; transmitting the packet from the AR to the MR using the LLA_MR in a link layer destination address field; in response to the arrival at the MR of the packet, checking, by the MR, the first neighbor cache using the CoA in the IP layer destination address field to obtain the associated LLA of the MNN; and transmitting the packet from the MR to the MNN using the obtained LLA in the link layer destination address field.