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allow users from specific static ip

We already completed the site. The problem is The site is having 3 logins . one is the main super admin for the client another two is for college admin .(Colleges will login here) & their students. All the works are completed.

For example: College IP:

172.16.4.1
172.16.1.101

This college should not be able to login except from this 开发者_Go百科IP. And there might be many college and each college can login only from there static IP. will it be possible.

Thanks


Since there is no language mentioned, I give a sample in php

function canLogin() {
   $allowed = array ('172.16.4.1', '172.16.1.101');
   if (in_array ($_SERVER['REMOTE_ADDR'], $allowed)) return 1;
   else return 0;
}

All you have to do is find the REMOTE_ADDR (user IP) and check if it is in approved list.

Note: It is possible to spoof remote address. But the above sample is simpler solution and better than nothing.

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