Re: Snort.conf variables

[Erek Adams <erek () snort org>]

On Mon, 10 Nov 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?
>
> And which one variable I have to use for my web and smtp server:
> var SMTP_SERVERS $HOME_NET or EXTERNAL_NET?

HOME_NET is what you want to watch.  EXTERNAL_NET is where the attacks
come from...  One way to do it:

        var HOME_NET <my_network>
        var EXTERNAL_NET !$HOME_NET

That means that the external net is everything _but_ the home_net.

Cheers!


-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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