29.14. Restricting Access by Client Address
Apache can also be configured to limit access to a directory, URL location, or filename to certain client systems. The web server knows the IP address of every browser that connects to it and can use that address to determine whether or not the browser is allowed to request certain pages.
In some situations, the client's real IP address will not be available to the web server. If the client is accessing the web through a proxy server or a firewall doing NAT, then the IP address from which the request appears to originate will be that of the proxy or firewall system. There is a way to get the real address, but generally it is not a problem because all clients behind the proxy or firewall are usually ...
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