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Re: Snort with IPtables
From: Steven McLaughlin <steve () Lan com au>
Date: Fri, 7 Jun 2013 14:13:58 +1000

That sort of makes sense since it is only listening in promisc mode, but
not actually allowing traffic in destined for its interface. I guess
IPtables works at L3 and without an IP it doesn't really matter if IPtables
is on or off then. Would this be a true statement? (I am only running as a
sniffer and not switching inline)

I'm interested to hear more feedback on this.


On 7 June 2013 14:08, Jeremy Hoel <jthoel () gmail com> wrote:

we run iptables on all our sensors, but we don't give the sniffing
port an ip and have no iptables entries for it.

It works like a champ.

On Thu, Jun 6, 2013 at 10:03 PM, Steven McLaughlin <steve () lan com au>
wrote:
Hi All,

Whats the take on running a snort sensor with IPtables running. In first
instance I would think this interferes with sensor detection capability.

Is anyone running IPtables on the same host as their Snort sensor? If so,
what is the best way to nail this? The reason I ask is that I have two
interfaces. One is the management interface which will have an IP
address.
This interface will deny all incoming traffic except for tcp/22 and
tcp/443
inbound connections.

The other interface is the snort sensor on eth1. The sensor is listening
only. So is a rule allowing all incoming like so sufficient for Snort
sniffing:

-A INPUT -i eth1 -j ACCEPT

Or should I also allow all outbound as follows:

-A INPUT -i eth1 -j ACCEPT
-A OUTPUT -i eth1 -j ACCEPT

Alternatively, is there a best practice IPtables configuration for snort
sensors?

thanks,

Steve


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-- 
Best Regards,
Steven McLaughlin
steve () Lan com au
0459 351 266
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