Kabushiki Kaisha Toshiba

Tatuya Jinmei

Masahiro Ishiyama

Yuzo Tamada

In a network system formed by one or a plurality of hosts having a function for accessing Internet, and a router for connecting each host and the Internet through an accessing communication path of a provider, two types of IP address including first type IP addresses and second type IP addresses are generated and selectively used by each host, according to two types of prefix including first type prefixes and second type prefixes that have shorter valid periods than the first type prefixes, which are advertised from the router periodically.

Prefix and IP address management scheme for router and host in network system

In a source address selection system containing a router device connected to a plurality of Internet service providers, and a communication node connected to the router device, it becomes possible to utilize the multi-home environment effectively, by enabling the selection of the source address according to the egress router with respect to the Internet, by accounting for the state of connection with the Internet service provider.

Source address selection scheme suitable for multi-home environment

At a node device, after an exchange procedure for exchanging a security association information is carried out, the security association information is stored in a memory unit while a management information including the destination address, the identification information, and an information regarding a valid period of the security association information is stored in a non-volatile medium, such that it is possible to recover the normal state quickly without damaging the safety, when a temporary operation trouble occurs at one node under an environment in which a plurality of nodes are carrying out communications safely by using a prescribed security protocol.

Node device and communication control method for improving security of packet communications

The host name to be used in responding to the reverse look-up request from the correspondent is generated at the name server side and returned as a response, and/or the IP address to be used in responding to the normal look-up request from the correspondent is generated at the name server side and returned as a response, so that the communications can be carried out without exposing the privacy of the communication host or the user to danger.

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Kanagawa, Japan

Tatuya Jinmei