Patent Document ID: 7710971
Application ID: 11592136
Patent Flag: 1

Claim One:
1. A method of blocking a network attack using information included in a packet, the method comprising: receiving a packet containing information on the packet comprising at least information on a source from which the packet is sent, and information on a destination to which the packet is sent; and extracting the information on the packet included in the packet, comparing the information with a predetermined access control condition, and blocking or passing the packet; wherein the information on the received packet comprises a routing header specifying intermediate nodes through which the packet is transferred, so that the packet is transferred through the intermediate nodes; wherein in the blocking or passing of the packet, the packet access control condition to block or pass the packet comprises a condition determined with comprising at least the source information, destination information, and routing header information of the packet; and wherein, in the blocking or passing of the packet, by comparing the source and destination information of the packet included in the information on the packet with the blocking or passing criterion with respect to source and destination included in the packet access control condition, the blocking or passing of the packet is firstly determined, and if a routing header is included in the information on the packet, by comparing the source and routing header information included in the information on the packet with the blocking or passing criterion with respect to source and destination included in the packet access control condition, the blocking or passing of the packet is secondly determined.