Abstract: A register stores the earliest time (IRL) at which a packet can be subsequently transmitted from a transmitting device in order to obey an allowable bandwidth given to the transmitting device, the earliest time (RL-1 to n) at which the packet of each class can be transmitted in order to obey the allowable bandwidth of the class, and a final time (RG-1 to n) at which the packet of each class is to be subsequently transmitted in order to maintain the guarantee bandwidth of the class. When a packet transmittable timing is reached, the packet of a class m which the final time (RG-1 to n) approaches is transmitted preferentially from the classes in which a current time reaches the earliest time (RL-1 to n). When the transmission of a packet is started, the next earliest time (IRL), earliest time (RL-m) of the class m and final time (RG-m) is determined based on the data volume of the packet.

Abstract: A register stores the earliest time (IRL) at which a packet can be subsequently transmitted from a transmitting device in order to obey an allowable bandwidth given to the transmitting device, the earliest time (RL?1 to n) at which the packet of each class can be transmitted in order to obey the allowable bandwidth of the class, and a final time (RG?1 to n) at which the packet of each class is to be subsequently transmitted in order to maintain the guarantee bandwidth of the class. When a packet transmittable timing is reached, the packet of a class m which the final time (RG?1 to n) approaches is transmitted preferentially from the classes in which a current time reaches the earliest time (RL?1 to n) . When the transmission of a packet is started, the next earliest time (IRL), earliest time (RL?m) of the class m and final time (RG?m) is determined based on the data volume of the packet.

Abstract: This network system includes a first device serving as a shared resource connected to a network, a second device connected to the network and including an object corresponding to the first device, and a third device for dynamically allocating first and second IP addresses of a plurality of available IP addresses to the first and second devices. The object has a static IP address, and the second device associates the first IP address allocated to the first device with the IP address of the object.

Abstract: This network system includes a first device serving as a shared resource connected to a network, a second device connected to the network and including an object corresponding to the first device, and a third device for dynamically allocating first and second IP addresses of a plurality of available IP addresses to the first and second devices. The object has a static IP address, and the second device associates the first IP address allocated to the first device with the IP address of the object.