appatus for converting IPv4-to-IPv6 using dual stack and method thereof

摘要

An apparatus for converting IPv4 to IPv6 using a dual stack and method thereof, where it is possible to support an IPv4-to-IPv6 conversion when a connection from an IPv4 node to an IPv6 node is initialized and even in case that there exists two or more DSTM TEPs (Dual Stack Transition Mechanism Tunneling End Point) in a DSTM domain. The apparatus for converting IPv4 to IPv6 using a dual stack in accordance with the present invention includes a DSTM server for, in case of receiving a DNS query message of an IPv4 type for a DSTM host from an IPv4 DNS server, converting the DNS query message of the received IPv4 type to a DNS query message of an IPv6 type which requests the IPv4 address and the IPv6 address of the DSTM host and transmitting the converted message to the IPv6 DNS server, and in case of not receiving a DNS response message including an IPv4 address of the DSTM host from the IPv6 DNS server, assigning an arbitrary IPv4 address to the DSTM host, registering the assigned IPv4 address in the IPv6 DNS server, informing the DSTM host of the assigned IPv4 address, and transmitting the assigned IPv4 address to the IPv4 DNS server; and a DSTM gateway.