Hi,
For the purpose of security I would like to restrict access to our web admin
system to
users that are physically in our office.
To this end (& because our internet connection is always a dynamic IP) I have
registered a
dyndns.org domain & have software running to update our IP with the dyndns
servers.
When a user logs in I can now compare their IP to the current IP of our office.
<?php
$officeIP = gethostbyname('example.dyndns.org');
$userIP = $_SERVER['REMOTE_ADDR'];
?>
If they dont match, then I can reject the login. This seemed to work fine for a
short while,
but then after our IP changed it seems that the function gethostbyname() is not
updating ... or is caching in PHP?
I'm not sure which, but if I check my IP on whatismyip.com AND do a Reverse DNS
Lookup
on dnsstuff.com for <example.dyndns.org> - the IP's DO MATCH.
PHP's gethostbyname() however reports the previous IP. If there was a delay in
PHP
updating I could understand, but it is always one step behind - even if i force
our office IP
to change, gethostbyname() quickly updates, but to the old IP - its still one
step behind.
Can anyone help to explain this strange behaviour?
Many Thanks,
Riquez
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