Allow request coming from specific IP only [closed]

This should do what you need:

<Directory /APP>    Order Allow,Deny    Allow from 160.120.25.65    Allow from 127.0.0.0/8</Directory>

See the mod_authz_host documentation for details.

What version of Apache are you running? The IP allowing mechanisms are, AFAIK, provided by mod_authz_host, which was introduced in 2.2 (well, 2.1 technically). If you do have 2.2, make sure it wasn't compiled with mod_authz_host disabled.

Generally speaking, though, you may find a simpler and more robust solution is the iptables or other firewalling suggested in the other answers.

I would suggest Iptables for this purpose. put a rule in the iptables that wherever the destination port is the port number of your apache machine and the source ip is the ip address of critix machine, the linux machine should drop that packet. This way would solve your problem provided there are no other applications hosted on the apache of your machine which ought to be open for all ips. An example of the perspective rule could be :-

iptables -I INPUT 1 -s 160.120.25.65 -d <port_of_apache_on_your_machine> -j DROP

This should solve your problem, once you replace by its proper value