[Snort-users] $eth1_ADDRESS still a valid variable in

Al Lewis (allewi) allewi at ...589...
Tue Feb 17 15:32:35 EST 2015

Can you send us the conf file you are using? Or how you are defining the variables?


Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi at ...589...

From: Starner, Mark [mailto:mark.starner at ...5850...]
Sent: Tuesday, February 17, 2015 12:54 PM
To: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] $eth1_ADDRESS still a valid variable in

Ok.. I get that…. So I come back to my original question.

How do I get $ethX_ADDRESS variables assigned if –enable-sourcefire is configured and I am not running snort as root? I thought running as root was a bad idea?

Here is the section of code from parser.c

    /* If snort is not run with root privileges, no interfaces will be defined,
     * so user beware if an iface_ADDRESS variable is used in snort.conf and
     * snort is not run as root (even if just in read mode) */

Is there another way to enable that?

Curious what the thinking is here?


From: Joel Esler (jesler) [mailto:jesler at ...589...]
Sent: Tuesday, February 17, 2015 12:21 PM
To: Starner, Mark
Cc: snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>
Subject: Re: [Snort-users] $eth1_ADDRESS still a valid variable in

Unfortunately that disables everything that we test against with the ruleset.  I suggest you not do that.

On Feb 17, 2015, at 12:03 PM, Starner, Mark <mark.starner at ...5850...<mailto:mark.starner at ...5850...>> wrote:

I retract my question. I configured “—enable-sourcefire” for the first time and found the comment in parser.c that said the $IF_ADDRESS variables are not defined if Sourcefire is enabled and snort is not running as root. So I recompiled without “—enable-sourcefire” and all is well.

Maybe this will help anyone else who comes across this.


From: Starner, Mark [mailto:mark.starner at ...5850...]
Sent: Tuesday, February 17, 2015 11:33 AM
To: snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>
Subject: [Snort-users] $eth1_ADDRESS still a valid variable in

I use $eth1_ADDRESS in one of my local rules, and when snort starts, it says:
ERROR: rules/local.rules(8) Undefined variable in the string: $eth1_ADDRESS.

I think I encountered this with a previous upgrade, but I don’t recall how I resolved it.

1)      Is this still valid with
2)      If Yes, then what would cause this NOT to be defined (yes, I verified I have an eth1 and it has an IP address defined.


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