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EXPERT RESPONSE
As you probably know, Snort is primarily a network intrusion detection system, designed to directly monitor a network for activity that matches certain patterns (the Snort ruleset). Unfortunately, it's really not a good tool for monitoring syslog traffic, because it's simply not designed for the task. However, there are a number of tools that can help analyze log data. If you're looking for a tool that helps perform offline analysis on the desktop, Sawmill is one of my favorites. Its major strength lies in its ability to tackle just about any log format you throw at it. If you want a system that provides real-time alerting, based upon syslog data, consider the open source Swatch (syslog watch) project. It's the "Snort of syslogs."
For More Information
Learn how to install, and configure Snort in this technical guide.
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