NETWORK SYSTEM PROVIDED WITH DUAL CONNECTION DEVICE AND CONNECTION FAILURE AVOIDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a network system that is provided with a dual connection device having a failure avoiding means that widely corresponds to connection devices and to provide a connection failure avoiding method. SOLUTION: The dual router 1 is provided with a routing processing part 107, an IP address 101 of the same value, a Dip switch 103 to which different value is set, a dual control part 104 and a transmission processing part 105, a reception processing part 106 and ports 11 to In. The part 104 periodically sends a health check request to the opposite device via a network in the case of a standby system, transmits health check response when a health check request sent from the opposite device is received in the case of an act system, decides a failure state from the state of the health check response from the act system to the standby system and has a function that switches the act and standby systems according to a prescribed reference.