Snort mailing list archives

Re: Snort.conf variables


From: "Remus" <rmocius () auste elnet lt>
Date: Tue, 11 Nov 2003 08:10:06 -0000

Hi,

Snort is running on eth0 (external NIC)
I use NAT with only C class IPs for local network.
What are HOME_NET and EXTERNAL_NET defined as relative to your network? -
Sorry what you mean?
And I want to pick up inbound attacks and outbound attacks on eth0.

Thanks

Regards

Remus


----- Original Message ----- 
From: "Matt Kettler" <mkettler () evi-inc com>
To: "Remus" <rmocius () auste elnet lt>; <snort-users () lists sourceforge net>
Sent: Monday, November 10, 2003 11:08 PM
Subject: Re: [Snort-users] Snort.conf variables


At 11:16 AM 11/10/2003, Remus wrote:
Just my small confusion regarding HOME_NET and EXTERNAL_NET variables.

I have a Linux firewall which one runs Snort as well:

eth0 - external network
eth1 - local network

And it has port forwards to web, smtp servers in the local network.

Now my question is which one variables I have to use for my eth0 and
eth1?

Given your question, there's no possible answer. And quite frankly, the
real answer may be "neither".  Snort configuration depends on a lot more
than just what your router interfaces are.

What interface is snort running on, eth0 or eth1?
Is there address translation going on?
What are HOME_NET and EXTERNAL_NET defined as relative to your network?
Are you looking to pick up inbound attacks, outbound attacks, or both?



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