[Snort-users] $HOME_NET question

Michael Steele michaels at ...155...
Wed Jan 22 13:11:05 EST 2003


RMC,

If you are using 'var EXTERNAL_NET !$HOME_NET', then short should pass on
everything defined in 'var HOME_NET blah' on that sensor.

-Michael
-- 
 Michael Steele | System Engineer / Support Technician     
 mailto:michaels at ...155...    
 Silicon Defense: IDS solutions - http://www.silicondefense.com
 Snort: Open Source Network IDS - http://www.snort.org


-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] On Behalf Of Ralph
Churchill
Sent: Wednesday, January 22, 2003 12:14 PM
To: snort-users at lists.sourceforge.net
Subject: [Snort-users] $HOME_NET question

I have snort 1.8.7. I have set my $HOME_NET to be
$eth0_ADDRESS and my external net set to !$HOME_NET.
However, I still get alerts from other computers on my
subnet! For example, the "SNMP public access udp" rule
says:

alert udp $EXTERNAL_NET any -> $HOME_NET 161...

For this example, assume my IP is 192.168.1.2. I'm
getting  alerts for a packet from 172.20.39.32 to
192.168.1.3. Why?   I'm totally confused. I thought
$HOME, if set to $eth0_ADDRESS would only give alerts
for things coming into my IP?!?! Am I wrong? 

RMC

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