I think what you want is not really a traffic analyzer but a log file parser for your http server (probably apache). Maybe take a look at awstats [1]. From the web site:
I am gonna throw out the recommendation for Splunk(http://www.splunk.com) if you are looking to do log analysis. There is a free version that lets you index 500Mb of logs per day. It does some pretty amazing stuff. Good luck.
-- Justin Gallardo gallardj@onid.orst.edu