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Re: Snort & iptables on the same box

from [Joachim Schipper] Network Security [Permanent Link]
Subject: Re: Snort & iptables on the same box
Date: Mon, 13 Jun 2005 10:01:47 +0200 
On Fri, Jun 10, 2005 at 05:04:28PM -0400, Jean-Pierre Denis wrote:

Hi,


 When running snort and iptables on the same box, which of the 2 act first ?

 Those it go thru snort and then the iptable rule allow or deny the
connection
 or it's the other way around


Merci,
JP


Hi JP,

Neither 'act first' in a standard configuration; if you use Snort in
(standard) IDS mode, it sees the packets at the same time as Netfilter
(the kernel part of IPTables) and acts independently.

If you use Snort_inline (IPS mode), the packets enter Netfilter, which
may choose to pass it to Snort_inline via the QUEUE target at some
point.

This is all in the snort documentation, BTW.

                Joachim

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