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10.4 Squid

Let’s take a closer look at a popular proxy server and web cache tool, Squid. Squid is an open-source web proxy, originally funded by a grant from the National Science Foundation,10 and currently released as free software under the GNU GPL. It is used in commercial organizations, universities, government, and many other environments to reduce bandwidth usage, improve web surfing performance, filter traffic, protect end-users, and log web surfing activity.

10. “IRCache Home,” 1999, http://www.ircache.net/.

From a forensic perspective, there are three important components of Squid:

• Configuration: Squid is configured using a file that is by default called “squid.conf.” Other configuration files may be included by reference.

• Logfiles: Squid is capable of storing several types of logfiles, including access.log (a record of web access history), squid.out (maintains startup times and fatal errors), cache.log (program debugging and error messages), store.log (a list of all objects stored to disk or removed), and useragent.log (information about client browsers).


  

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