Patent ID: 7860029

Claim:
A subscriber line accommodation device comprising: a subscriber line termination section that terminates a plurality of subscriber lines individually; an address information allocating section that, when a communication terminal of any of the plurality of subscriber lines terminated by said subscriber line termination section has made a request for acquisition of own-station address information that is given to a packet when performing packet communication, allocates own-station address information to said communication terminal by limiting a usable time; a filter condition registering section that registers a pair of the own-station address information allocated by said address information allocating section and an identification number of the subscriber line having made said request for acquisition of the own-station address information; a learning section configured to learn a sender address of a received packet, learn a logical port number having received the packet and register the learned sender address and logical port number in a table; a bridge forwarder, configured to extract a destination address from the packet and search the table to identify a logical port that is connected to the destination address; and a packet communication allowing section that allows packet communication only for the packet in which a pair of own-station address information and an identification number agree to the pair thereof registered in said filter condition registering section.