| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To determine whether access is from the inside of an intranet with high accuracy. <P>SOLUTION: An IP address system of the intranet 3 and the domain name of a DNS server 12 are previously registered in a database, IP addresses of terminals 11a and 11b themselves are compared with the IP address system of the intranet 3 registered in the database, a first determination result as to whether the IP addresses of the terminals 11a and 11b themselves belong to the IP address system of the intranet 3 is output, the domain name is acquired from DNS servers 12 and 21, the acquired domain name is compared with the domain name of the DNS server 12 registered in the database, a second determination result as to whether the respective domain names coincide with each other is output, and communication of the terminals 11a and 11b are controlled on the basis of the first and second determination results. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
