I use an external tool to achieve this.
Endian produces squid log proxies, but with some slight changes.
Then those files can be imported on a 3rd party program to analyze traffic.
This is a good one for Windows, but $$$:
http://www.redline-software.com/eng/products/iam/It lets you filter by IP, date, URL, etc etc etc.
In order to get the EFW http proxy log files working (in directory /var/log/squid ), you must remove the first columns of each log file:
Aug 27 10:26:53 EFW squid[4560]: 1282922813.017 645 192.168.0.10 TCP_MISS/404 1608 GET http://www.efwsupport.com/favicon.ico - DIRECT/X.X.X.X text/htmlMust be converted to:
1282922813.017 645 192.168.0.10 TCP_MISS/404 1608 GET http://www.efwsupport.com/favicon.ico - DIRECT/X.X.X.X text/htmlI used notepad++ and a simple regex to change all the files in a of minutes.
There should be some free alternative, although I didn't find a good one yet. If you find one useful, let me know.