Abstract: A method of providing mobility between network subnets for a plurality of mobile network nodes attached to a mobile router, which mobile router hides any change in network subnet from said plurality of mobile network nodes and which network subnets provide access for said mobile router to a fixed network infrastructure, which method comprises the steps of (a) providing a signaling channel for each of said plurality of mobile network nodes; and (b) providing a data channel for each of said plurality of mobile network nodes; characterized in that said signalling channel utilises a multicast communication protocol to perform a mobility function on behalf of one or more of said plurality of mobile network nodes.