Abstract: In a network system where a switching exchange accommodating an ISDN provides TDMoIP packet communication over an IP network, measures for packet loss prevention need to be taken during a period during which a TDM service is packet-transferred over the IP network. When a transmitting-end switching exchange in the above network system multiplexes TDM data, the present invention varies the degree of multiplicity in accordance with the delay in the IP network and the type of data.

Abstract: The present invention relates to an ink composition containing a phthalocyanine coloring matter represented by the following formula (1): (wherein, each of the rings A to D independently represents a benzene ring or a pyridine ring, M represents a metal atom or the like, X represents a carbonyl group or the like, Y represents a hydrogen atom; a nitro group; a hydroxy group; a sulfo group; a carboxy group; an amino group; an alkoxy group, an alkylthio group, an alkylsulfonyl group which may be substituted; an aryloxy group, an arylthio group, an arylsulfonyl group, a heteroaryloxy group, a heteroarylthio group, a heteroarylsulfonyl group or an amino group, which may be substituted; or the like, and L is from 2 to 8) or a salt thereof; and said ink composition gives, in inkjet printing on plain paper, printed matters exhibiting an extremely excellent water fastness.

Abstract: The access server receives an authentication packet including an authentication result, a port change setting information, a port change time, a filtering setting information and a filtering time from the authentication server. The access server stores the respective information in the authentication packet into a memory. The access server refers to the memory, and in the case where the port change setting information on an arbitrary user identifier is set to perform port change, when it becomes the port change time, the access server changes the output destination of a packet from a user terminal to, for example, a proxy server B from a proxy server A. Besides, in the case where the filtering setting information on an arbitrary user identifier is set to perform filtering, when it becomes the filtering start time, the access server performs filtering on the port to which the user terminal is connected.

Abstract: A method for processing data received from at least one of VLANs, the method including: obtaining, based on a VLAN tag included in a MAC header of a MAC frame received from the VLAN and a first destination IP address included in an IP header of the MAC frame, a second destination IP address, changing the first destination IP address of the IP header to the second destination IP address, and generating an IP packet by deleting the MAC header from the MAC frame.

Abstract: One physical VLAN server provides a plurality of VLANs with services. VLANs #1 to #3 are connected to the VLAN server though a switching hub. The VLAN server includes server processes #1 to #3 corresponding to the VLANs #1 to #3, respectively, for providing the VLANs with services. The server processes #1 to #3 each have internal IP addresses N1, N2, and N3. The VLAN server has external IP addresses G1, G2, and G3 for the VLANs #1 to #3, respectively.

Abstract: An IP address provision request issued from a client terminal according to the DHCP protocol is transferred to a DHCP server, and an application for provision of an IP address is received. At this time, a packet transfer system stores pieces of information on the client terminal (IP address and MAC address) in a memory unit. Moreover, the client terminal or the packet transfer system itself broadcasts an ARP request. Pieces of information on the client terminal (IP address and MAC address) contained in an ARP packet are also stored in the memory unit. If the stored IP addresses contained in the DHCP and ARP packets respectively agree with each other, packets addressed to the client terminal that has transmitted the ARP packet are filtered in order to decide whether the packets are allowed to pass through the port.

Abstract: Upon receiving a connection request from a terminal, a packet transfer apparatus registers information on the terminal with a memory and forwards information necessary for the authentication of the terminal and an authentication request to an authentication server. The apparatus then receives authentication permission and a multicast group address list associated with the terminal that has made the connection request from the server. The apparatus then associates the multicast group address list received with the terminal information stored in the memory for registration. Upon receiving a participation request from the terminal, the apparatus determines whether or not the group address contained in the participation request is present in the list in the memory. If the group address is present in the list in the memory, the apparatus permits the delivery of a packet to the terminal from a content delivery server and transmits the packet to the terminal.

Abstract: A packet transfer apparatus for accommodating a plurality of hosts to transfer packets between the plurality of hosts and an ISP network. Upon receipt of a connection authentication request from a host, the packet transfer apparatus transmits ID and password information (information required for authentication) included in the request to an authentication server in the ISP network, acquires IP address information for the host from the authentication server, and notifies a DNS server in the ISP network of the IP address information, and previously registered domain name information of the host.

Abstract: A packet routing arrangement, when receiving a request to join or leave a multicast group from a host unregistered to that group, a response is sent exclusively to the unregistered host. In the packet routing arrangement, when receiving request packet from a host to join or leave a group, including the identifier of the group, it is determined whether the source host of the packet is registered to that group; and, if it is not registered, the first group identifier is changed to a second group identifier assigned to another delivery server delivering information to the other unregistered host and the packet is transferred to this other delivery server. When receiving a packet containing certain information from this delivery server, the second group identifier included in the received packet is changed to the first group identifier and the packet is transmitted to the unregistered host.

Abstract: One physical VLAN server provides a plurality of VLANs with services. VLANs #1 to #3 are connected to the VLAN server though a switching hub. The VLAN server includes server processes #1 to #3 corresponding to the VLANs #1 to #3, respectively, for providing the VLANs with services. The server processes #1 to #3 each have internal IP addresses N1, N2, and N3. The VLAN server has external IP addresses G1, G2, and G3 for the VLANs #1 to #3, respectively.