METHOD FOR ADMITTING OR INTERCEPTING SELECTIVELY AN ACCESS TO INTERNET BY USERS USING PRIVATE IP

A method for selectively allowing and preventing an access to the Internet based on a TCP/IP(Transmission Control Protocol/Internet Protocol) when private IP users simultaneously access the Internet is provided to accurately obtain information about users who simultaneously use the Internet by recognizing respective private IPs of the users in a private network using a particular Internet IP. The number of allowable IP policies, namely, the number of available private IPs of each private network, is stored in a PMT(Policy Management Table). The ID, public IP, and private IP of respective user computers currently connected with the Internet are stored in an IP pool. Applets are executed in user computers that want to access the Internet through a Web browser to obtain a private IP of each user computer. When private IP users simultaneously access the Internet, corresponding IP pool information and the PMT are compared, and a user computer which has been subscribed by an Internet service provider is necessarily allowed to access the Internet while the other remaining user computers are allowed to access the Internet as many as the number of PMTs. In case of a private IP for which the Internet access has been prevented, a packet, instead of a user requested page, is analyzed and transmitted so as to be redirected to allow a user to first receive a page having a function of playing a particular role.