Protocol conversion apparatus and method between IPv4 terminal and IPv6 terminal or between application programs using mapping table, and method of generating mapping table of protocol conversion apparatus

摘要

Provided is a protocol conversion apparatus and method supporting communication between terminals through a protocol conversion when IPv4/IPv6 terminals coexist or a terminal supports an IPv4/IPv6 dual stack in one physical network but an application service supports a specific protocol. A conventional SIIT protocol conversion technique can be used by receiving a communication request through an IPv4 and IPv6 dual stack for a communication request of an IPv4 terminal or an IPv6 terminal, and supporting a protocol conversion between the IPv4/IPv6 terminal through a mapping table mapping respective actual IP address and virtual IP address of the IPv4 and IPv6, and performing communication between the IPv4/IPv6 terminals. Therefore, it is possible to transparently communicate to each other in an IP protocol version. Moreover, a terminal communicates with another terminal in an external network through a conventional protocol or a protocol conversion technique without modification.