A network entity located in a first network using a first protocol, the network entity supporting at least the first protocol of the first network and a second protocol of a second network. The network entity comprises a receiving unit for receiving data packets according to the first or second protocol, a mapping table for storing addresses according to the first and second protocols, an address determination unit for determining a destination address for a received packet from the mapping table, and a routing unit for routing the received packet in accordance with the determined destination address.