Multiple logins from one machine

[verlen]

Hi!

Is there a way to prevent users from multi-registration?

I have a site, where people get credits by inviting people to the site. After each registration, the inviter gets a credit. There is only an IP and a cookie check on the site (and the email of course). In case the system finds out that the reg has been completed from a "known" IP, the inviter doesn't get a credit. This goes for the cookie thing as well.

What can be done to check if the user who registers has already been registered (using anoher ip, email)?

[revraz]

What if they are from a Dorm or Work location where they all come from the same IP?

 

There is no way to validate if its the same person or not.  You can easily grab a new IP, and easily create a new email account.

 

You could limit it by not allowing free email accounts to sign up.