Communication system, communication apparatus, communication method, and non-transitory computer-readable medium storing communication program

A communication apparatus comprising:

• at least one memory storing instructions;
• and
• at least one processor configured to execute the instructions to do motion determination process, wherein the motion determination process includes:
• communicating with a device within the same network;
• forming a tunnel network together with an opposite device, and virtually enabling communication with the opposite device in the same network segment via the tunnel network;
• storing a plurality of communication policies between the same network and the same network segment, and enabling reference to the communication policy;
• and
• referring to a communication policy stored in the policy storage portion, and performing transfer control of a packet received by the communication portion or the tunnel communication portion according to the communication policy.

A communication method, comprising:

• communicating with at least one first device within the same network;
• forming a tunnel network together with at least one opposite second device, and virtually communicating with the second device in the same network segment via the tunnel network;
• executing IGMP snooping, and analyzing a multicast transfer policy;
• and
• controlling packet transfer according to the multicast transfer policy for a packet to be transferred in communication between the first device and the second device.