Network Device, Communication Control System, Communication Control Method, and Non-Transitory Computer Readable Storage Medium

A communication system includes a first network device including a RADIUS server configured to determine whether to authenticate a network communication of a terminal, or a first RADIUS client corresponding to a RADIUS server and storing identification information identifying the RADIUS server and a secret key, and a second network device directly connected to the first network device in the same network segment as the first network device. The first network device includes a first processor and a first memory device configured to store a first program, the first program being executed by the first processor to cause the first processor to transmit the identification information and the secret key to the second network device in a first time period.