Patent ID: 6118784
Filing Date: 2000-09-12
Classification: H04L

Abstract:
A method of communicating an IPv4 terminal of an IPv4 network and an IPv6 terminal of an IPv6 network in a communication network system comprising said IPv4 network, said IPv6 network, and an IPv4-IPv6 converting apparatus connected to both of said networks, comprising the steps of:in accordance with that said IPv4 terminal inquires an IP address for a domain name of said IPv6 terminal to said IPv4-IPv6 converting apparatus, obtaining, in said IPv4-IPv6 converting apparatus, an IPv6 address for said domain name from a DNSv6 server apparatus for managing domain information of said IPv6 network;capturing, in said IPv4-IPv6 converting apparatus, an IPv4 address corresponding to said IPv6 address from a DHCPv4 server apparatus for dynamically allocating IPv4 addresses and notifying said IPv4 terminal;forming, in said IPv4 terminal, a first IPv4 packet by setting an own IPv4 address to an IPv4 source address and by setting said notified IPv4 address to an IPv4 destination address, and sending said first IPv4 packet to said IPv4-IPv6 converting apparatus; andconverting, in said IPv4-IPv6 converting apparatus, the IPv4 source address included in said received first IPv4 packet to an IPv6 source address by adding fixed data to said IPv4 source address, converting an IPv4 destination address included in said IPv4 packet to a corresponding IPv6 address, forming a first IPv6 packet from said first IPv4 packet, and sending said first IPv6 packet to said IPv6 network.