If I do "var EXTERNAL_NET $DMZ_NET", then I would only see alerts from DMZ ->
HOME. I would like to see alerts from EXTERNAL to HOME as well as DMZ to HOME.
Just like many of you from DC metropolitan area, I use routable IPs in my
HOME_NET too. =)
Anyhow, I just ran a test by using 2 custom sigs:
alert tcp $EXTERNAL_NET any -> $HOME_NET any ("msg:"Inbound tcp traffic";
sid:5000000;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any ("msg:"Outbound tcp traffic";
sid:5000001;)
I guess Snort does interpret correctly as I can see traffic from EXTERNAL to
HOME, DMZ to home and vice versa. However, I'm interested to know, Joel, from
my last question regarding VNC server reponse. If now I know that I have
defined EXTERNAL_NET and HOME_NET properly, what would be the cause of what I
have seen?
Hin
Joel Esler <joel.esler@sourcefire.com> wrote:
Why wouldn't you just do a var EXTERNAL_NET $DMZ_NET
??
Joel
On Sep 28, 2005, at 9:53 AM, Hin wrote:
Hi Snorters,
I set the following in my snort.conf
var HOME_NET 192.168.0.0/16
var DMZ_NET [192.168.5.0/24,192.168.10.0/24,192.168.15.0/24]
var EXTERNAL_NET [!$HOME_NET,$DMZ_NET]
Snort starts properly, but I don't know if Snort interprets
EXTERNAL_NET correctly. Is there a way that I can find this
information out?
ps. Let's not try to understand how I get into this situation.
Cheers,
Hin
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