Re: IPS options

["Russ Combs (rucombs)" <rucombs () cisco com>]

Looks like your iptables rule specifies tcp, so the icmp rule won't fire because Snort isn't getting icmp traffic.

Check Snort's shutdown counts to see if it is getting the traffic you want.  You may want to change your iptables rules.

________________________________
From: Y M [snort () outlook com]
Sent: Thursday, March 06, 2014 7:31 AM
To: snort-users
Subject: Re: [Snort-users] IPS options



________________________________
From: jlay () slave-tothe-box net
To: snort-users () lists sourceforge net
Date: Thu, 6 Mar 2014 05:15:31 -0700
Subject: Re: [Snort-users] IPS options

On Thu, 2014-03-06 at 06:26 +0000, Y M wrote:
As far as I know, signatures with "alert" keyword should still work as usual when running Snort inline. Only those 
signatures marked with "drop" will be dropped, the rest , i.e.: "alert" signatures, should only alert as normal, at 
least when using the afpacket DAQ. I wouldn't imagine the behavior is different for NFQ, but I never tested it.

We have two sensors running inline (afpacket), and although they do not contain "alert" signatures at the moment, they 
worked as expected during testing in regards to running  "alert" and "drop" signatures at the same time.

YM.

> To: snort-users () lists sourceforge net
> Date: Wed, 5 Mar 2014 16:46:45 -0700
> From: jlay () slave-tothe-box net
> Subject: [Snort-users] IPS options
>
> Hey all,
>
> So....looking at changing a current Snort IDS to IPS...I've gotten some
> good feedback, but wanted to post here as well. The setup is a linux
> box with two nics already bridged. I'm need to just IPS a certain
> protocol/port combination, and still alert as usual on everything else.
> I looked at DAQ NFQ, but found that after getting that to work, other
> alerts stopped. So what are my options for this? I read through the
> daq doc and whatnot, but wanted opinions here as well. Thanks for any
> insight.
>
> James

Thanks YM and waldo...here's what I've tested:

iptables -I INPUT -p tcp --dport 80 -j NFQUEUE --queue-num 1
snort -Q -D --daq nfq --daq-var device=eth0 --daq-var queue=1 -c snort/snort.conf

rules:
drop tcp any any -> any 80 (msg:"Test 80"; sid:10000053;)
alert icmp any any -> any any (msg:"Ping test"; sid:10000054;)

testing:
[05:09:22 jlay@James<mailto:jlay@JamesiMac>:~$] telnet analysis 80
Trying 192.168.1.6...
^C
[05:09:31 jlay@James<mailto:jlay@JamesiMac>:~$] ping analysis
PING analysis (192.168.1.6) 56(84) bytes of data.
64 bytes from analysis (192.168.1.6): icmp_seq=1 ttl=64 time=0.176 ms

results:
03/06-05:09:28.544877  [Drop] [**] [1:10000053:0] Test 80 [**] [Priority: 0] {TCP} 192.168.1.2:34392 -> 192.168.1.6:80

So...looks like this method no workie.  What daq mode are you using YM?

--daq afpacket --daq-mode inline


Thank you.

James
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