Snort mailing list archives
Re: snort on a worksation (fc1) <-- router <-- cable-modem <-- internet
From: Matt Kettler <mkettler () evi-inc com>
Date: Tue, 11 May 2004 18:54:25 -0400
At 04:52 PM 5/11/2004, steph march wrote:
I would like to monitor for internet activity and not the internal activity, but I'm having trouble understanding how to do that with a router. (and for sure, activity on the workstation with snort, which is, let say, 192.168.1.3) So it will look like this : var HOME_NET [192.168.1.0/24] but what happen if 192.168.1.1 is the router ?
What about it? Do you honestly expect packets to be addressed to 192.168.1.1 (other than arps)?
You won't be able to see any internet traffic addressed directly to the router, but that would be impossible anyway. Internet traffic to the router is going to be addressed to the outside interface address, not the inside address, and you'll only be able to see that traffic by tapping inbetween the cablemodem and the router.
and what about the workstation with snort (192.168.1.3) ?
So? Do you want to monitor internet traffic being a It sounds like you want the following as your HOME_NET and EXTERNAL_NET: var HOME_NET [192.168.1.0/24] var EXTERNAL_NET !$HOME_NETAlso be aware if you are using any ethernet switches, or a switch built into the router, snort will only see traffic relating to the switch port snort is connected to.
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Current thread:
- snort on a worksation (fc1) <-- router <-- cable-modem <-- internet steph march (May 11)
- Re: snort on a worksation (fc1) <-- router <-- cable-modem <-- internet Matt Kettler (May 11)