Hitachi, Ltd.

Toshikazu Yasue

Hidemitsu Higuchi

Ken Watanabe

Kazuaki Tsuchiya

Takahisa Miyamoto

Naoya Ikeda

Shinichi Hamamoto

Yoshifumi Atarashi

Munechika Sumikawa

Tetsuo Oura

Seiji Kageyama

Toru Horimoto

Yukio Shimamoto

Katsumi Tadamura

Tatsuya Watanuki

Takeshi Uno

Takeyuki Endo

Kazuko Iwatsuki

Hirotada Ueda

Masakazu Ejiri

Michihiro Mese

Sadahiro Ikeda

Eiji Ohira

Shuji Ohno

Yoshinori Watanabe

Yoshiaki Kitazume

Norihiro Goto

Yuuji Saeki

Shiro Oishi

Satoshi Asou

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

A packet communication method and a packet communication system capable of making an IPv4-compatible application operating on an information processing apparatus communicate with another information processing apparatus connected to an IPv6 network without using an address translation router. In the information processing apparatus connected to the IPv6 network, an IPv4-to-IPv6 protocol conversion control function is incorporated in a LAN driver. A protocol conversion control module receives an IPv4 packet from a protocol control module. When a send destination IPv4 address contained in a header of the packet is registered in an address translation table incorporated in the protocol conversion control module, an IPv6 address is generated to be sent onto a LAN. Unless the send destination IPv4 address contained in the packet header is registered in the address translation table incorporated in the protocol conversion control module, the IPv4 packet as received is intactly sent onto the LAN.

Packet communication method and apparatus and a recording medium storing a packet communication program

A packet communication method and a packet communication system capable of making an IPv4-compatible application operating on an information processing apparatus communicate with another information processing apparatus connected to an IPv6 network without using an address translation router. In the information processing apparatus connected to the IPv6 network incorporates, an IPv4-to-IPv6 protocol conversion control function is incorporated in a LAN driver. A protocol conversion control module receives an IPv4 packet from a protocol control module. When a send destination IPv4 address contained in a header of the packet is registered in an address translation table incorporated in the protocol conversion control module, an IPv6 address is generated to be sent onto a LAN. Unless the send destination IPv4 address contained in the packet header is registered in the address translation table incorporated in the protocol conversion control module, the IPv4 packet as received is intactly sent onto the LAN.

A packet switch apparatus including a plurality of connecting points, each being coupled to one of a plurality of data processing units, and apparatus for receiving a first packet including identification information of a first data processing unit via a first connecting point. The invention further includes a storage for storing correspondence between the first data processing unit and the first connecting point based on the identification information. Apparatus, responsive to reception of a second packet from a second data processing unit to be transmitted to the first data processing unit, transmits the second packet to the first data processing unit via the first connecting point based on the correspondence stored in the storage.

System for and method of exchanging server data in packet unit

A network apparatus according to the present invention is connected to a single server apparatus or a plurality of server apparatus via a link. The network administrator sets in advance the band volume to be used by a frame transmitted from each of the server apparatus within the range of the communication band volume possessed by the link. The network apparatus has a band controller that instructs each of the server apparatus to transmit a PAUSE frame. The network apparatus is also provided with a transmitter that transmits a PAUSE frame to each of the server apparatus via the link according to the instruction of the band controller. Each of the server apparatus receives the PAUSE frame transmitted from the network apparatus. Each of the server apparatus suspends frame transmission to the network apparatus for the suspension period set in the received PAUSE frame.

Network apparatus and a method for communicating by using the network apparatus

According to the present invention, an information network wherein, packets can be forwarded between entities on a network along a plurality of lines, each line carrying separate copies of information. If a portion of one copy of the information is lost due to line failure, for example, other copies flowing along different lines can be used to reconstruct the lost information. In a representative embodiment, a plurality of LAN lines respectively connect between terminals and LAN-to-LAN forwarding devices or between two LAN-to-LAN forwarding devices. The terminals or the LAN-to-LAN forwarding devices are respectively provided with multiple line transmitting units for respectively transmitting the same packets to the plurality of LAN lines substantially contemporaneously. There are also provided multiple line receiving units for respectively selecting any of the same packets sent from the plurality of LAN lines and receiving it.

Packet transmitting and receiving method and apparatus therefor

Growing community of inventors

Chigasaki, Japan

Toshikazu Yasue