Patent ID: 8582599

Claim:
A communication apparatus comprising: a first network interface to be coupled to a first apparatus using an Internet Protocol version 6 (IPv6) as a communication protocol via a first network; a second network interface to be coupled to a second apparatus using an Internet Protocol version 4 (IPv4) as a communication protocol via a second network; and a processing unit which is configured to receive an IPv6 packet having an IPv6 header from the first apparatus via the first network interface, to extract 32 bits corresponding to an IPv4 address of the second apparatus from a destination address in the IPv6 header if the destination address includes preset data, to create an IPv4 packet having an IPv4 header which includes the IPv4 address as a destination address which is the 32 bits, the communication protocol of the IPv4 packet being different from the communication protocol of the IPv6 packet, and to send the IPv4 packet via the second network interface to the second apparatus.