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Re: Monitoring Multiple Subnets
From: Caleb Jaren <tropism.prophet () gmail com>
Date: Tue, 14 May 2013 14:49:57 -0700

I couldn't make sense out of your diagram as gmail is doing some funky
rendering ATM, but I would imagine that unless your budget is *free* this
would work out pretty well. It has a SPAN port and is under $100 USD.

http://www.amazon.com/Netgear-GS108T-NAS-Prosafe-8-Port-Gigabit/dp/B003KP8VSK

I use one of these both at work and at home for doing monitoring and have
no complaints.

I dont have your setup, but I'd imagine that so long as both routers are
plugged into the unmanaged switch and that $HOME_NET on the snort box is
configured properly it will work. Of course, you'll probably have to set it
up and try it out to be 100% sure. :)


On Mon, May 13, 2013 at 8:23 AM, Shaun Marlin <shaun.marlin () canalta com>wrote:

That does make sense.  The thing that I am most concerned about is because
there is an unmanaged switch, could it fail?  I would love to have a SPAN
setup, but that isn’t in the budget.****

** **

*From:* Seth Dunn [mailto:seth () d2ms com]
*Sent:* Monday, May 13, 2013 9:17 AM
*To:* Shaun Marlin; snort-users () lists sourceforge net
*Subject:* RE: [Snort-users] Monitoring Multiple Subnets****

** **

For what I did....I don't have quite the same setup as you, but I needed
to monitor multiple LANs.
10.75.x.x/24 and 10.76.x.x/24****

I am using a Cisco switch for my networks.
I set up SPAN on my switch, RSPAN is also available, to copy traffic from
two ports in which inbound/outbound traffic flows for these LANs.....and
set up the destination port for the port that my Snort box is listening on.
****

** **

Then as someone noted, in your snort.conf file you need to make sure these
two networks are part of your $HOME variable.****

** **

*From:* Shaun Marlin [mailto:shaun.marlin () canalta com<shaun.marlin () canalta com>]

*Sent:* Monday, May 13, 2013 11:04 AM
*To:* snort-users () lists sourceforge net
*Subject:* [Snort-users] Monitoring Multiple Subnets****

** **

I am building a SNORT box to monitor my network.  I have 2 ISP’s.  Is it
possible to have the 2 ISP’s connect into an unmanaged switch, then have
SNORT configured with an IP from each block that I have, and finally pass
the traffic back onto the switch that goes into my network?****

** **

Sorry for the run on question there****

** **

Essentially I am looking for something like this****

** **

**
**** **

** **

** **

************ISP 1****


Router
1
Internal Network****

                                                                   ****

****
****

**
**** **


********ISP
2
Router 2****


****

****
SNORT****

** **

** **

                                Unmanaged Switch****

** **

** **

SNORT would endup monitoring 3 different subnets.  For instance 1.1.1.0/27
2.2.2.0/27 and 3.3.3.0/29.****

** **

Does anyone see a reason why this would not work****

** **

*Shaun Marlin*
Network Administrator


*Canalta Family of Companies*****

2109 - 545 Highway 10 East
Drumheller AB Canada T0J 0Y0
PHONE: (403) 820-3865
CELL:     (403) 334-1313  ****

EMAIL:   shaun.marlin () canalta com
WEB:      www.canalta.com

 ****

** **


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