[Snort-users] Snort and my VLANs

Josh Bitto jbitto at ...16055...
Fri Feb 15 11:09:43 EST 2013

I actually resolved this...but since its Friday and you might not enjoy the rest of your life without knowing this. :P
We are using proxmox virtual environment with a pfsense firewall.....so all my interfaces are created through that......Turns out I did everything correctly I was just being a noob on triggering events.

From: Ayodele Okeowo [mailto:aymacro at ...11827...]
Sent: Friday, February 15, 2013 5:54 AMA
To: Josh Bitto
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Snort and my VLANs


YM is right, you will need a distributed IDS to do this, however, what you can do is, place your Sensor in a specific VLAN, and then assign that VLAN to the egress interface of your Core switch or edge router before traffic cross over to the Internet. This way you would be able to sense and drop any packets.

And if you want to capture/sniff packets per VLAN, create a port mirroring on a VLAN, then assign that VLAN to the interface where your IDS is plugged to. All traffic will be mirrored to this interface so you can monitor them on your IDS.

Are your devices Ciscos or Juniper or mixed environment?


On Thu, Feb 14, 2013 at 4:56 PM, Josh Bitto <jbitto at ...16055...<mailto:jbitto at ...16055...>> wrote:
I'm having issues where I am not able to determine if I can actually catch bad traffic with snort.

Right now I have snort in a test lab where I have interfaces WAN, LAN....and then my VLANS. My firewall does all the routing and has the vlans setup. So when I go to testmyids.com<http://testmyids.com> and trigger a rule I get the rule triggered on my WAN interface but not any of my VLANs......

Basically what I'm trying to initiate is if a user brings in a byod...I want to be able to detect anything on that machine when it connects to my internal vlan.

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