Patent ID: 7936773
Filing Date: 2011-05-03
Classification: H04L

Abstract:
1. A communication channel establishment method for establishing a communication channel between a first communication device and a second communication device opposite thereto, comprising the steps of: waiting for a packet transmitted from the second communication device to the first communication device; providing packet waiting timers each counting a time taken to wait for the packet, with a random interval left therebetween; receiving a packet other than the sequence of each packet expected to be transmitted from the second communication device; accepting the packet; and establishing the corresponding communication channel, based on the packet accepted in the accepting step; wherein the first communication device functioning as a responder, when the first communication device transmits a first internet security association and key management protocol (ISAKMP) message to the second communication device and then receives the first internet security association and key management protocol (ISAKMP) message from the second communication device; and wherein the second communication device functioning as a responder, when the first communication device transmits the first internet security association and key management protocol (ISAKMP) message to the second communication device and then receives a second internet security association and key management protocol (ISAKMP) message from the second communication device.