Patent ID: 6690669
Filing Date: 2004-02-10
Classification: H04L

Abstract:
A method for notifying a first terminal using IPv6 as a communication protocol of an address of a second terminal using IPv4 as a communication protocol, comprising the steps of:sending a first message inquiring of an IP address of said second terminal to a manager apparatus which manages address information, said first message being created by said first terminal; receiving a second message containing an IPv4 address of said second terminal sent from said manager apparatus in response to said first message; converting said IPv4 address to said second terminal into an IPv6 address corresponding to said IPv4 address of said second terminal; sending a third message containing the IPv6 address thus converted to said first terminal; and wherein said first message sending step further comprises the substeps of: sending said first message to a first manager apparatus which manages IPv6 address information; and sending said first message to a second manager apparatus which manages IPv4 address information, if said second message is not received from said first manager apparatus within a predetermined time.