I have configured squid proxy server and blocked Facebook site. I need to give permission for a particular user to access Facebook for a limited time. For that how to modify the configuration file. this the screen shot of the configuration file.
Screen shot (The font size is small, so please zoom the image)
In this line,
http_access deny Facebook all !allowip118 !allowip113 !allowip108 !allowip18
What is configured here ?. Facebook is denied but what !allowip113 indicates ?