Internet Access Controller using .net ( vb or c# )

I want to develop a software which restricts users internet access using vb6 or vb.net.

This is not a baby sitter program but

1) whenever a client machine takes any browser it should ask f开发者_JAVA技巧or username and password.

2)There should be option for adding new users at the server side application.

can anyone suggest any name of such a software. or some sites where I can get some help

on the same..

You could implement a HTTP proxy using sockets. You would turn off internet connection sharing on your server and configure the other machines to connect to the web via your proxy.

I would recommend going for an off the self solution e.g. in a router rather than building something from scratch.

If you are dead set on using VB6 you could make use of the winsock control. Here is a project using winsock to serve files. You could modify it to become a multithreaded proxy server instead. It will be a tough challenge though. http://www.codeproject.com/KB/IP/winsock.aspx