DNS SEVER DATA CHANGING SYSTEM AND AUTHENTICATION SERVER

摘要

PROBLEM TO BE SOLVED: To surely register/delete data in a dynamic DNS server, at using of an emergency connection service to the Internet. SOLUTION: An authentication sever checks prescribed information in a message related with charging received from a network access server, and when the prescribed information indicates that a user computer is starting its connection to the Internet, registers data related with the computer in a DNS server; and when the prescribed information indicates that the user computer has ended the connection to the Internet, the server deletes the data related with the computer from the DNS server.