[Snort-users] Snort Install for monitoring 5 interfaces?

Chris Vaughan chrisv at ...12963...
Tue Feb 8 08:18:10 EST 2005

You will have to have a separate snort process running for each interface you want to listen on.
Like so:
/usr/sbin/snort -A full -d -D -i eth0 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth0
/usr/sbin/snort -A full -d -D -i eth1 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth1
/usr/sbin/snort -A full -d -D -i eth2 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth2
/usr/sbin/snort -A full -d -D -i eth3 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth3
/usr/sbin/snort -A full -d -D -i eth4 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth4
Now, the script that comes with the Snort rpms will spawn a separate snort for each interface you specify in the /etc/sysconfig/snort configuration file.  I don't know if the source distribution comes with such a script, but it probably does.
Hope that helps,
Chris Vaughan
-----Original Message-----
From: snort-users-admin at lists.sourceforge.net [mailto:snort-users-admin at ...3204...ts.sourceforge.net]On Behalf Of sEc nErD
Sent: Tuesday, February 08, 2005 10:21 AM
To: Leon Ward
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Snort Install for monitoring 5 interfaces?
Hi LEon, 
Thanks for your reply.Ok right now i have set it up in a test lab enviornment and its listening on one interface.I am still not clear what i would have to do for listening on 5 different interfaces???
i have the acid up and running just not contacting the mysql database but tht i will struggle and work around,but i do need to understand the part for 5 interfaces...could you please detail on thzt

Leon Ward <leon at ...9950...> wrote:
Sorry if this is a bit quick, but in a rush.

snort needs to connect to a single interface on start-up, this leaves
you with two options.
A) Have multiple snort instances running bound to each interface.
- This will allow you to customise the configuration for each, I assume
you will want to protect different things on the DMZ compared to the
B) Team the interfaces together so you can attach snort to interface

Take a look at the following link, it may answer a few questions (I'm a
debian man myself)

Hope the above helps.


On Sun 2005-02-06 at 06:04 -0800, sEc nErD wrote:
> hi all,
> We ahve to install snort on a box running fedora.
> And this snort is supposed to listen on 5 interfaces 
> inside pix,outside pix and 3 dmz's.
> could anyone give some precautions and pointers for
> the install to be taken since its going to listen on 5
> interfaces .Right now am building the box from scratch
> by putting in network cards and installing fedora on
> it ,any precuation on that stage??
> thanks all in advance
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