RE: Help with pass rule

[Erek Adams <erek () theadamsfamily net>]

On Wed, 28 Aug 2002 francisv () dagupan com wrote:

> I have the following line:
>
>       preprocessor portscan-ignorehosts: $HOME_NET
>
> in my snort.conf file. Is portscan-ignorehosts directly related to scan
> attempts?

Yes.  It's part of the portscan preprocessor.  It tells the plugin what IP's
to ignore 'scans' from.  The logic of portscan is something like "If you see
over X connections to a port or multiple ports in Y seconds, then it's a
portscan."  DNS servers can set it off if it's not setup right.

You may want to change your HOME_NET and EXTERNAL_NET values, depending on how
you see your network.  If SERVER_NET is also HOME_NET then I would define
EXTERNAL_NET as !$HOME_NET.  That would set it to every IP except your
HOME_NET.

Cheers!

-----
Erek Adams
Nifty-Type-Guy
TheAdamsFamily.Net



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