Patent ID: 7450584

Claim:
A network repeater apparatus comprising: a network repeater connected with a plurality of networks; a VLAN tag processing part that performs prescribed VLAN tag processing with respect to a communication packet based on prescribed information of said communication packet when said communication packet is input from any one of said plurality of networks; a first address translation part that translates a source address of said communication packet based on said prescribed information, said first address translation part being installed in a prescribed external device; a first output part that outputs to a prescribed virtual network a communication packet which has been subjected to at least either one of processing by said VLAN tag processing part or address translation by said first address translation part, and wherein said VLAN tag processing part is provided with a VLAN tag addition part that adds a prescribed VLAN tag to said input communication packet, said prescribed information is at least either one of information on a source network of said communication packet or information on a destination of said communication packet, said external device includes: an input part to which said communication packet output by said first output part is input; a first VLAN tag rewrite part that rewrites a VLAN tag already added to said input communication packet into a prescribed VLAN tag based on said prescribed information of said communication packet input by said input part; and a second output part that outputs to said prescribed virtual network a communication packet which has been subjected to at least either one of the processing by said VLAN tag processing part and the address translation by said first address translation part; and said first address translation part translates the source address of said communication packet input by said input part.