Snort mailing list archives
Re: IPS options
From: James Lay <jlay () slave-tothe-box net>
Date: Thu, 06 Mar 2014 05:15:31 -0700
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 gottensomegood feedback, but wanted to post here as well. The setup is alinuxbox with two nics already bridged. I'm need to just IPS a certain protocol/port combination, and still alert as usual on everythingelse.I looked at DAQ NFQ, but found that after getting that to work,otheralerts stopped. So what are my options for this? I read through the daq doc and whatnot, but wanted opinions here as well. Thanks foranyinsight. 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:~$] telnet analysis 80 Trying 192.168.1.6... ^C [05:09:31 jlay@James:~$] 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? Thank you. James
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Current thread:
- IPS options James Lay (Mar 05)
- Re: IPS options waldo kitty (Mar 05)
- Re: IPS options Y M (Mar 05)
- Re: IPS options James Lay (Mar 06)
- Re: IPS options Y M (Mar 06)
- Re: IPS options Russ Combs (rucombs) (Mar 06)
- Re: IPS options James Lay (Mar 06)
- Re: IPS options James Lay (Mar 06)