An arrangement for selective filtering, e.g. one-way filtering, of messages received by a 2-port bridge from stations connected to two LANs of an extended LAN is provided. The bridge includes a message filtering database containing the addresses of all stations connected to one of the LANs. The database...http://www.google.de/patents/US5515513?utm_source=gb-gplus-sharePatent US5515513 - Disposition filtering of messages using a single address and protocol table bridge
