Re: Snort with two instances

[Eoin Miller <eoin.miller () trojanedbinaries com>]

On 12/22/2010 7:07 PM, J. L. Cabral wrote:
> Dear all, I have a Snort 2.9 box with two sniffing interfaces:
>
> 1) eth1 sniff DMZ traffic --> in snort.conf HOME_NET = 172.18.10.0/24
> 2) eth2 sniff LAN traffic --> in snort.conf HOME_NET = 10.10.0.0/16
>
> Is it better to have two different snort.conf files, for example:
>
> snort-eth1.conf
> snort-eth2.conf
>
> and run two snort instanes like these:
>
> snort -D -u snort -g snort -c /snort/etc/snort-eth1.conf -i eth1
> snort -D -u snort -g snort -c /snort/etc/snort-eth2.conf -i eth2
>
> In this case, what happen if I download rules with oinkmaster, will they
> apply on both snort-eth1.conf and snort-eth2.conf files ???
>
> Or what is the best way to do I need ???
>
> Really thanks,
>
> JeLo

Here is what we do if we applied it to your type setup:

1) Have a master /etc/snort/snort.conf that has everything you want in
it except the interface and home net defined.

2) Have a /etc/snort/snort-eth1.conf that looks like this:

config interface: eth1
HOME_NET = 172.18.10.0/24
include /etc/snort/snort.conf

3) Have a /etc/snort/snort-eth2.conf that looks like this:

config interface: eth2
HOME_NET = 10.10.0.0/16
include /etc/snort/snort.conf


This way the snort-eth1.conf and snort-eth2.conf pickup all the changes
you make to your master snort.conf. However, you may really want to do a
bunch of additional tuning to customize the conf files (and rules they
use) to be tuned to each network. If not though, this is a real easy way
to just have the few options you need for various instances to be setup.

-- Eoin



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