Snort mailing list archives

Re: Snort.conf variables


From: Matt Kettler <mkettler () evi-inc com>
Date: Mon, 10 Nov 2003 18:08:01 -0500

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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