Method and devices are provided for enabling a mobile network device to select a foreign agent from among a plurality of foreign agents that are transmitting position information. According to some aspects of the invention, the position information includes global positioning system ("GPS") data that are included in advertisement packets transmitted by the foreign agents. A mobile network device such as a mobile router may use the position information to select the closest foreign agent. Alternatively, the mobile network device may use the position information to select the foreign agent that is approaching most rapidly, based on the reference frame of the mobile network device.