I want to create a php script which blocks a user and not a whole network(modem). I know i can get the IP from the modem, but how can my server differentiate the user behind the modem? Is there a possible solution?
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2There is no way just to block one user. You could block the combination of user agent and ip, but the user could change the browser. A hacker could cange his user agent as well so far almost not possible. – rekire Feb 27 '13 at 16:05
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Maybe you are looking for something like 'Mac Address', [Check this out](http://stackoverflow.com/questions/1420381/how-can-i-get-the-mac-and-the-ip-address-of-a-connected-client-in-php) – Silent Byte Feb 27 '13 at 16:05
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5@Silent Except that the MAC address is typically not usable, as the answer you link to states. – deceze Feb 27 '13 at 16:06
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1Permanent, per-user block *are* possible, but you have to know how to hide a body. – Sammitch Feb 27 '13 at 16:09
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There is no way just to block one user: You could block the combination of user agent and IP address, but the user could change the browser. A hacker could change his user agent as well so far almost not possible.
Things you could try (but they may fail):
- Block the combination of User-Agent and IP
- Set a block cookie
- Set a block entry in the local storage
- Create a fingerprint based e.g. on the installed plugins or fonts
rekire
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See for an example of fingerprinting https://panopticlick.eff.org/ – Marcel Korpel Feb 27 '13 at 16:14
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When user is clever enough to know how to clean cookies, it's not possible to do what you want without blocking IP.
Serge Kuharev
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There are more ways to track a user, but you are right that tracks can be errased. – rekire Feb 27 '13 at 16:07
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Yes, I understand that there is a clever ways like browser+ip, but the idea was that users can overcome all that. – Serge Kuharev Feb 27 '13 at 16:08