Abstract: In a wireless LAN system using an access point to perform access control for accesses from a plurality of client terminals, an access point and each of a plurality of client terminals have a transmission means using a data transmission carrier wave frequency and a control signal transmission carrier wave frequency; each of the plurality of client terminals has a memory storing priority information; when the data transmission carrier wave frequency is not sensed on the wireless LAN, data are transmitted to the access point at a relevant data transmission carrier wave frequency; when the data transmission carrier wave frequency is sensed on the wireless LAN, a band reservation request is sent to the access point at a relevant control signal transmission carrier wave frequency along with priority information stored in the memory; and after a transmission confirmation is received from the access point for the band reservation request, data is transmitted to the access point at a relevant data transmission carrier

Abstract: A communication apparatus comprises a storage unit for storing a first network list indicating plural networks; a receiving unit for receiving a second network list indicating plural networks from an outside by using a first authentication protocol; an operation unit for executing an AND operation by using the first network list and the second network list to create a transmission-use network list; and transmission unit for transmitting the transmission-use network list to the outside.

Abstract: A communication method in a multicast communication network constructed including Layer-2 switches and able to selectively distribute multicast packets to only designated receiving terminals (i.e. receivers), comprising providing a multicast receiving terminal discrimination mechanism for discriminating the multicast receiving terminals and selectively distributing multicast packets to only receiving terminals requesting distribution of multicast packets when there are receiving terminal relating to requests under a Layer-2 switch.

Abstract: In a wireless LAN system using an access point to perform access control for accesses from a plurality of client terminals, an access point and each of a plurality of client terminals have a transmission means using a data transmission carrier wave frequency and a control signal transmission carrier wave frequency; each of the plurality of client terminals has a memory storing priority information; when the data transmission carrier wave frequency is not sensed on the wireless LAN, data are transmitted to the access point at a relevant data transmission carrier wave frequency; when the data transmission carrier wave frequency is sensed on the wireless LAN, a band reservation request is sent to the access point at a relevant control signal transmission carrier wave frequency along with priority information stored in the memory; and after a transmission confirmation is received from the access point for the band reservation request, data is transmitted to the access point at a relevant data transmission carrier

Abstract: In a network device for setting a configuration definition remotely, a storage generates, upon changing a first (current) IP address to a second IP address, a virtual address which holds the second IP address, a message transceiver transmits a response request message whose source IP address is the second IP address, and a configuration definition setting portion changes the first IP address to the second IP address when the response message for the request is received.

Abstract: A communication apparatus comprises a storage unit for storing a first network list indicating plural networks; a receiving unit for receiving a second network list indicating plural networks from an outside by using a first authentication protocol; an operation unit for executing an AND operation by using the first network list and the second network list to create a transmission-use network list; and transmission unit for transmitting the transmission-use network list to the outside.

Abstract: In a network device for setting a configuration definition remotely, a storage generates, upon changing a first (current) IP address to a second IP address, a virtual address which holds the second IP address, a message transceiver transmits a response request message whose source IP address is the second IP address, and a configuration definition setting portion changes the first IP address to the second IP address when the response message for the request is received.

Abstract: A communication method in a multicast communication network constructed including Layer-2 switches and able to selectively distribute multicast packets to only designated receiving terminals (i.e. receivers), comprising providing a multicast receiving terminal discrimination mechanism for discriminating the multicast receiving terminals and selectively distributing multicast packets to only receiving terminals requesting distribution of multicast packets when there are receiving terminal relating to requests under a Layer-2 switch.

Abstract: In a label switching router and a path switchover method thereof when a path fault occurs, a relay label switching router registers a hop destination indicated in a received message in a path hop list, forwards the message to a next hop destination without deleting the hop destination, and notifies an identifier of a path in which a fault has recovered to an ingress label switching router based on the path hop list, an egress label switching router registers the hop destination indicated in the received message in a path hop list, and notifies an identifier of a path in which a fault has recovered to the ingress label switching router based on the path hop list, and the ingress label switching router regards, when detecting a recovery of a path higher in priority than an active path or when receiving a recovery notification, the recovered path as an active path.