Communicating method between IPv4 terminal and IPv6 terminal...

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header

Reexamination Certificate

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C370S401000, C370S466000

Reexamination Certificate

active

07072338

ABSTRACT:
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.

REFERENCES:
patent: 6038233 (2000-03-01), Hamadoto et al.
patent: 6118784 (2000-09-01), Tsuchiya et al.
Request for Comments (RFC) 791, 1034, 1541, 1883, 1884, 1886 and 1918 issued by Internet Engineering Task Force (IETF).
“Transition Mechanisms for Plv6 Hosts and Routers”, Network Working Group, RFC 1933, HTTP://DS.INTERNIC.NET/RFC/RFC1933.TXT, R. Gilligan et al, Apr. 1996, pp. 1-22.
Communications of the Association for Computing Machinery, vol. 39, No. 6, Jun. 1996, “IP Next Generation Overview”, R. Hinden, pp. 61-71.
IBM Systems Journal, vol. 34, No. 3, Jun. 21, 1995, “TCP/IP: The Next Generation”, E.G. Britton et al, pp. 452-470.
R. Callon et al, “Routing Aspects of IPv6 Transition”, www.rfc-editor.org, Sep. 1999.
G. Tsirtsis et al, “Network Address Translation-Protocol Translation (NAT-PT)”, www.rfc-editor.org, Feb. 2000.
R. Coltun et al, “OSPF for IPv6”, www.rfc-editor.org, Sep. 1999.
M. Takamura et al, “A Seamless Interconnection Technique for IPv4/IPv6 Internets”, Technical Report of Information Processing Society of Japan, vol. 96, No. 95, Sep. 27, 1996, pp. 79-84.

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