Re: Snort IPS with one NIC

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

On 2016-10-17 15:28, Dave Corsello wrote:
> FYI - Neither the nfq nor the afpacket daq modules work with a single
> interface.
>
> I believe AWS allows you to created a virtual machine with multiple
> network interfaces.  But it doesn't allow any components to be
> promiscuous, so this rules out Snort IPS on a network with multiple 
> hosts.
>
> I rigged up a work-around on a single-interface remote machine in which
> a simple perl script monitors an alert.fast log and inserts BLOCK rules
> in iptables for IPs that trigger priority 1 and 2 Snort alerts.
>
> Blocking all priority-2-triggering IPs might be too coarse, but it's 
> the
> best I can come up with for now.  Any suggestions?
>
> On 10/12/2016 5:59 PM, Dave Corsello wrote:
> > I am considering using a remotely hosted server as a web server, and
> > would like to know if it is possible to protect it with Snort IPS.  
> > I've
> > been using Snort inline for several years using the usual 3
> > interfaces--two bridged and one for management.  Can Snort be run in 
> > IPS
> > mode to protect the local server with only one network interface?  
> > Seems
> > like this must have been asked many times before--sorry if this is a 
> > repeat.

Lemme lab this one up....I recall at some point in time using some fancy 
iptables rules in the mangle table plus snort I was able to get IPS on a 
single nic...might take me a bit to get to, but I will.

James

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