Patent ID: 7991856

Claim:
A network system comprising: a monitoring server, a DHCP server, a client including a DHCP client, a SNMP agent, a IP management table for storing an IP address and a SNMP management table for storing SNMP information including a community name; and a network to which the monitoring server and the DHCP server are connected; in which the DHCP server including a network-information management table that has stored IP information and SNMP information assigned to a client in association with the address of the client, implementing a DHCP function which refers to the network-information management table to assign IP information automatically when the client is newly connected to a network, and implementing an SNMP information management function which refers to the network-information management table to assign SNMP information automatically when the client is newly connected to a network; wherein the DHCP client broadcasts a first request signal that has stored an assignment request of IP information and SNMP information when the client is newly connected to the network; when receiving the first request signal, the DHCP server, by the DHCP function and the SNMP information management function, automatically searches the network-information management table, to obtain the IP information and the SNMP information corresponding to the address of the client, stores the IP information and the SNMP information in a first acknowledge signal, and unicasts the signal to the client; when receiving the first acknowledge signal, the DHCP client broadcasts a second request signal that has stored an assignment request of IP information and SNMP information, to report to the DHCP server that the received information is to be used; when receiving the second request signal, the DHCP server, by the DHCP function and the SNMP information management function, automatically searches the network-information management table to obtain the IP information and the SNMP information corresponding to the address of the client, stores the IP information and the SNMP information in a second acknowledge signal, and unicasts the signal to the client; when receiving the second acknowledge signal, the DHCP client stores the IP information stored in the second acknowledge signal, into the IP management table, and stores the SNMP information stored in the second acknowledge signal, into the SNMP management table; the SNMP agent of the client stores an IP address read from the IP management table, a community name read from the SNMP management table, and a host name of the client into a notice signal, and sends the notice signal to the monitoring server; and when receiving the notice signal, the monitoring server stores information of the client in a monitoring control table, and starts monitoring and controlling the client.