The present invention allows a mobile node to seamlessly move across IP (Internet Protocol) subnets. In one embodiment, the invention includes registering a mobile device with a home agent (HA) through a proxy server, receiving a home internet protocol (IP) address assignment from the HA, assigning the home IP address to the mobile device as an inner IP address, mapping the inner IP address to a physical point-of-attachment of the mobile device, and assigning an outer IP address. The embodiment further includes tunneling packets for the mobile device to the proxy server using the inner and outer IP address, and delivering packets from the proxy server to the mobile device at the point-of-attachment.