Packet transfer device, packet transfer method and packet transfer program

A packet transfer device, wherein:

• an OpenFlow switch extracts a second packet in accordance with a rule determined in advance;
• and
• a virtual machine, connected to the OpenFlow switch through a virtual interface, processes the extracted second packet to act as proxy for the OpenFlow switch.

A packet transfer method comprising:

• extracting a first packet of a protocol determined in advance using an OpenFlow switch;
• and
• responding to the extracted first packet, using a NameSpace connected to the OpenFlow switch through a virtual interface, to act as proxy for the OpenFlow switch.

A packet transfer method comprising:

• extracting a second packet in accordance with a rule determined in advance using an OpenFlow switch;
• and
• processing the extracted second packet, using a virtual machine connected to the OpenFlow switch through a virtual interface, to act as proxy for the OpenFlow switch.