NEtwork MObility (NEMO) support mechanisms (rfc3963) have recently been specified by the IETF to allow a mobile network referred to as a NEMO network, to migrate in the IP topology while maintaining continues IP connectivity for the internal nodes.

NEMO networks use mobile routers (MR) (rfc3753) to connect to the Internet. The the Mobile Network Nodes (MNNs) located inside the mobile network benefit from a seamless Internet connectivity while the mobile router changes its location from a network link to another.

The mobile router maintains a tunnel with a Home Agent (HA) located in the home network. While the MR changes its link location, it obtains new IP addresses from the visited links. To maintain the tunnel with the HA, the MR sends binding updates to tell the HA about the new IP address (Care of Address). All the traffic generated by nodes located inside the NEMO network is forwarded by the MR to the HA through the tunnel. From there, the HA forwards the packets to the destination (correspondent node or CN in NEMO terminology) . Packets coming from the Internet in destination to the NEMO network are tunneled by the HA to the MR and then forwarded to the final destination located inside the NEMO network.

Labels: wireless, networking