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Next: 3.6 How can I Up: 3 Configuring Snort Previous: 3.4 My network spans

3.5 How do I set EXTERNAL_NET?

Many people set EXTERNAL_NET to ``any''. 

    var EXTERNAL_NET any
By setting it to ``any'' Snort will alert you on any traffic matching a rule coming into or leaving your network.

To cut down on the work that Snort has to do, many people set it to ``not HOME_NET.'' 

    var EXTERNAL_NET !$HOME_NET
This tells Snort to define EXTERNAL_NET as everything except HOME_NET. For most people this is the best thing to set it to.


Nigel Houghton 2006-10-02
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