NETWORK ADDRESS TRANSLATION DEVICE, NETWORK ADDRESS TRANSLATION SYSTEM, NETWORK ADDRESS TRANSLATION METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

摘要

A network address translation device (10) is provided with communication units (11, 12) connected to layer 2 switches of private networks (200, 300) and an address translation unit (13) for, upon receiving a packet that is from a node in one of the private networks and has a node in another private network as the recipient thereof, specifying the sender and recipient addresses of the packet, translating the specified sender and recipient addresses on the basis of preset rules, and transmitting the translated packet to the layer 2 switch of the private network of the recipient node via a communication unit (11, 12).