Hello, I am new here. I am working in an ISP. I like to know that how can I prevent user to use multiple computer with single internet connection? I have searched on the web and found nothing. I think it is only possible by detecting different TTL value that comes from same IP address. And I didn't get any thing from the web. I like to know that is it possible to do with IPTABLES? Please someone help me on this matter. Thanks. Hasan Syed Jowhor.