Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Norihiro Kambe

Hiroaki Miyata

Daiki Nozue

Shinsuke Shimizu

A method for processing data received from at least one of VLANs, the method including: obtaining, based on a VLAN tag included in a MAC header of a MAC frame received from the VLAN and a first destination IP address included in an IP header of the MAC frame, a second destination IP address, changing the first destination IP address of the IP header to the second destination IP address, and generating an IP packet by deleting the MAC header from the MAC frame.

VLAN server

One physical VLAN server provides a plurality of VLANs with services. VLANs #to #are connected to the VLAN server though a switching hub. The VLAN server includes server processes #to #corresponding to the VLANs #to #, respectively, for providing the VLANs with services. The server processes #to #each have internal IP addresses N, N, and N. The VLAN server has external IP addresses G, G, and Gfor the VLANs #to #, respectively. When a client #-on the VLAN #issues data to the VLAN server with the destination IP address being set to G, a receiving-VLAN-tag-NAT processing section of a device driver in the VLAN server changes the destination IP address from Gto Nwith the use of a VLAN tag V, and the server process #receives the data

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Yokohama, Japan

Norihiro Kambe