Encapsulation device, communication system, encapsulation method, and encapsulation program

A communication system comprising:

• an encapsulation device configured to transmit a data packet from a transmitting device to a receiving device, wherein the encapsulation device includes a tunneling unit implemented using one or more processors, wherein the encapsulation device is configured to:
• receive a data packet with an inner header attached from the transmitting device,
• generate a second parameter group obtained by converting a first parameter group read from the inner header on the basis of a conversion rule, and
• encapsulate an outer header including the second parameter group and the conversion rule into the inner header of the data packet to transmit the encapsulated data packet toward a decapsulation device configured to decapsulate the data packet;
• and
• a decapsulation device, wherein the decapsulation device is configured to decapsulate the outer header of the encapsulated data packet received from the encapsulation device to acquire the second parameter group from the outer header based on the conversion rule included in the outer header, and
• compare the first parameter group read from the inner header of the decapsulated data packet with the acquired second parameter group to perform verification processing for determining whether the data packet is to be discarded or transferred to the receiving device.