Techniques employed in packet networks for transferring a packet across subnetworks with different namespaces. When a packet enters a given subnetwork and has a destination in a subnetwork with a different namespace, the given subnetwork encapsulates the packet by adding a header which specifies a decapsulator...http://www.google.de/patents/US5940394?utm_source=gb-gplus-sharePatent US5940394 - Transferring messages in networks made up of subnetworks with different namespaces
