Re: Snort Inline mode with iptables problems on Ubuntu 12.04

[James Lay <jlay () slave-tothe-box net>]

On 2014-03-19 13:17, Shiva wrote:
> Hi,
> I have installed the latest version of snort in inline mode and I
> have been having problems in accessing the machine once I change the
> iptables entries.I am able to start the snort with no issues.But as
> soon as I change the iptables, I am no longer able to access it.Here
> is the iptables commands that I use.
>
> iptables -A INPUT -i lo -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
> iptables -A OUTPUT -o lo -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
> iptables -A INPUT -j QUEUE
> iptables -A FORWARD -j QUEUE
> iptables -A OUTPUT -j QUEUE
>
> snort -Q —daq afpacket —daq-mode inline -i eth0:eth1 - u snort -g
> snort -c /etc/snort/snort.conf
>
> (I believe I don’t have to install extra modules for ip_queue on
> ubuntu 12.04).Please let me know what I am doing wrong here?Any
> suggestions is greatly appreciated.
>
> —
> Shiva

Gotta assign the queue a number and point snort to it:

snort -Q --daq nfq --daq-var device=br0 --daq-var queue=1 -c 
/etc/snort/snort.conf
iptables -I FORWARD -j NFQUEUE --queue-num 1

As I understand it, you only get one queue, so choose wisely.  I could 
be wrong as I'm in the early stages of converting from IDS to IPS.

James


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