Patent ID: 8547998

Claim:
An IPv6 packet conversion method for tunneling an IPv6 packet through an IPv4 network, comprising: searching a tunneling information table which uses a prefix value of a network connected to a destination node to which the IPv6 packet is to be transmitted as a tunnel entry; and converting the IPv6 packet into an IPv4 format according to the searched tunneling information, wherein the searching comprises, searching for a tunneling information having a prefix value of a network, the prefix value of the network which matches the IPv6 address of the destination node to which the IPv6 packet is to be transmitted the longest, as the tunnel entry and a tunneling information including an IPv4 address to be appended to the IPv6 packet to be transmitted to a destination node through the tunneling information table, wherein the tunneling information stored in the tunneling information table uses a prefix value of the network as a tunnel entry, and consists of at least IPv4-related information among a local IPv4 address, a destination IPv4 address, a local UDP port number, and a destination UDP port number.