Patent ID: 7729365

Claim:
A gateway for controlling electric equipment connected to LAN, through WAN, the gateway comprising: an address mapping table in which LAN addresses defined in a network layer of the LAN correspond to WAN addresses defined in a network layer of the WAN, network layer means for converting, according to the address mapping table, a source address and a destination address in the network layer of the LAN into WAN addresses in the network layer of the WAN, for a packet received from the LAN, and application layer means for converting, according to the address mapping table, the source address in the network layer of the LAN which is included in an access address defined in an application layer of the LAN into a WAN address in the network layer of the WAN, for the packet, to thereby modify the access address, wherein the source address is a real address of a source which is the electric equipment, and the destination address is a virtual address of a destination which is connected with another LAN that is connected with the WAN, the source is accessed from the destination via the WAN, to thereby allow the destination to control the source in a manner identified by the access address.