Regarding snort.conf HOME_NET and EXTERNAL_NET

[Brandon Phelps <bphelps () gls com>]

Hello,

The default snort.conf indicates that you should leave EXTERNAL_NET as 
"any" in most situations.

I already have HOME_NET set to [10.0.0.0/8] (my internal network) so 
would it be prudent to set EXTERNAL_NET to !$HOME_NET instead, or should 
I leave it as any?  I would like to cut down on false positives and such 
as much as possible without the risk of losing any truly malicious alerts.

I have seen other configuration examples that have EXTERNAL_NET set to 
negate HOME_NET, so I'm not sure which is best.

Thanks,
Brandon

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