Page 1 of 1

IP address and multiple registrations

Posted: Wed Nov 12, 2008 5:41 am
by nithyavivegam
I have created a website where the user can register only once from a single system. i.e I track the IP address and from a single IP address, the user can register only once. But I realize that the IP address would change for the same user and for the same system when it is a non-static IP.

Is there a way to restrict users from registering twice using the same system?

I am using PHP and MySQL for development.

Thanks!

Re: IP address and multiple registrations

Posted: Thu Nov 13, 2008 12:34 am
by novice4eva
I would have said yes if there were any chances of getting our hands on clients MAC address but this myth has been busted by vladsun in here
viewtopic.php?f=6&t=89514

Re: IP address and multiple registrations

Posted: Thu Nov 13, 2008 4:49 am
by shiznatix
There is really no way to do it, the best would be using a cookie but what if more than 1 person use the same computer (like at an internet cafe)? Using the IP is terrible because many computers can use the same IP address, like here in my office we have 10 computers on the same IP address, so if one of us registered then the other 9 would be blocked from registering.

In short, no, you can't do it.