[Snort-users] Network Variables

Seth Dunn seth at ...16266...
Tue Apr 30 13:19:28 EDT 2013


Great.
Thank you for the confirmation.

Do you know how to set up bpf filters under windows?
I would like to go that route so I can fine tune things vs. just
blocking out entire IP ranges.
But I have had no luck getting that to work.

-----Original Message-----
From: Jeremy Hoel [mailto:jthoel at ...11827...] 
Sent: Tuesday, April 30, 2013 11:26 AM
To: Seth Dunn
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Network Variables

Yes..   since you are only negating some ip's, the rest that match will
work.

On Tue, Apr 30, 2013 at 3:04 PM, Seth Dunn <seth at ...16266...> wrote:
> Ok, I think I got it corrected.
> I altered my EXTERNEL_NET variable to ::  
> [!10.30.0.0/24,!10.10.0.0/24] That seems to have stopped the 
> false-positives, while still logging other traffic.
> So I am assuming there is a default "any" aspect to this variable.
>
>
>
> From: Seth Dunn [mailto:seth at ...16266...]
> Sent: Monday, April 29, 2013 10:23 AM
> To: snort-users at lists.sourceforge.net
> Subject: [Snort-users] Network Variables
>
>
>
> Hello,
> I am running Snort on Windows 2008 Server R2
>
> I am trying to figure out how I can bypass traffic that is being sent 
> from certain networks, since it is creating false-positives
>
> Information on my setup.
> My watched networks are:: 10.75.x.x/24 and 10.76.x.x/24 Now I also 
> have two other networks, that are not being watched, but are part of 
> my companies network and setup.
> They are:: 10.10.x.x/24 <- Office network
> 10.30.x.x/24 <- Remote VPN users
>
> Originally I tried putting in a .bpf file, but that did not work. 
> (anyone know how to make it work?)
>
>
> So I tried my HOME_NET like this::
> [10.75.0.0/16,10.76.0.0/16,!10.10.0.0/24,!10.30.0.0/24]
> That didn't work, snort still sent out alerts for the two networks.
> So I put HOME_NET back to ::  [10.75.0.0/16,10.76.0.0/16] And set 
> EXTERNAL_NET to this::  [any, !10.10.0.0/24,!10.30.0.0/24], that did 
> not work So I tried::  [any, [!10.10.0.0/24,10.30.0.0/24]], that did 
> not work
>
>
>
> Any ideas on what I can do to fix this?
>
> My networks 10.75.x.x and 10.76.x.x are connected to the networks 
> 10.10.x.x and 10.30.x.x via two Cisco PIX 515E's
>
>
>
> Thanks,
> Seth
>
>
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