Hitachi, Ltd.

Yoshifumi Atarashi

Naoya Ikeda

Hidemitsu Higuchi

Kazuaki Tsuchiya

Ken Watanabe

Toshikazu Yasue

Takahisa Miyamoto

Shinichi Hamamoto

Munechika Sumikawa

Kenji Hayashi

Hideki Kamimaki

Yoshiki Kurokawa

Kiyokazu Nishioka

Shoichiro Yamaguchi

In an apparatus, there are provided an IP transmitting and receiving unit for transmitting and receiving an IPv4 packet and an IPv6 packet; an IP header converting unit for performing a mutual conversion of the IPv4 packet and the IPv6 packet by an IP header conversion; a DNS substituting unit for receiving a domain information capturing request sent from an IPv4 terminal or an IPv6 terminal and substituting its process; an IPv4 address capturing unit for capturing an IPv4 address from a DHCP server; and an IP address conversion information holding unit for holding an IPv6 address of the IPv6 terminal and the IPv4 address captured by the IPv4 address capturing unit in correspondence to each other. Thus, a communication with the IPv4 terminal can be executed without preliminarily fixedly allocating the IPv4 address to the IPv6 terminal.

Communicating method between IPv4 terminal and IPv6 terminal and IPv4-IPv6 converting apparatus

Communication method between IPv4 terminal and IPv6 terminal and IPv4-IPv6 converting apparatus

Communicating method between IPv4 terminal and IPv6 terminal and IPv4 converting apparatus

Communication apparatus and method of hand over of an assigned group address from one communication apparatus to another

In order to realize server switching to a backup server from a working server without changing any setting on a client computer, a network system is provided having a network supervising means for supervising operations of a plurality of server computers connected to the network, a server switching means for realizing server switching in which the backup server computer alternatively executes the server function of the working server computer by virtually setting the address of the working server computer connected to the network as the address of the backup server computer. A packet converting means is provided for converting the packet transmitted and received between the working server computer and the client computer into the packet transmitted and received between the backup server computer and the client computer.

System for reliably connecting a client computer to a server computer

Growing community of inventors

Zama, Japan

Yoshifumi Atarashi