| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To efficiently perform authentication by one ID and password, to realize single sign-on where trouble of ID management is saved, to avoid a multiplex tunnel and to reduce load of a terminal and a network terminal device for providing VPN service to the terminal of a user of an access network in an environment without inter-network reachability. <P>SOLUTION: A provider managing an intermediate communication network does not manage ID and the password but entrusts management of ID and the password to a manager of a private network which is to use VPN, and does not construct a multiplex tunnel from a terminal twice but constructs a tunnel between the terminal and a first network terminal device and a tunnel between a call device and a second network terminal device by one authentication request which the terminal emits. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
