Patent ID: 7593337

Claim:
A packet processing system comprising: a forwarding device that transmits and receives a packet through a network interface; and a control device that transfers the packet between the control device and the forwarding device, and responds to the packet using an application, wherein the control device includes a symbol section that is associated with address information of the forwarding device; and a first transfer control section that when detecting that the application accesses the symbol section, sets a packet transfer rule in the forwarding device by transmitting to the forwarding device a setting request that the forwarding device sets the packet transfer rule that is used to transfer the received packet to the control device, and the forwarding device includes a second transfer control section that sets the packet transfer rule in response to the setting request, wherein the symbol section is a virtual interface corresponding to the network interface, the first transfer control section, when detecting that application closes a communication port for access to the symbol section, cancels the packet transfer rule in the forwarding device by transmitting to the forwarding device a cancel request that the forwarding device cancels the packet transfer rule, and the second transfer control unit cancels the packet transfer rule in response to the cancel request.