Snort mailing list archives

Re: reject is identical to drop


From: Kevin Ross <kevross33 () googlemail com>
Date: Thu, 7 Jul 2011 09:02:43 +0100

From the manual:

6. drop - block and log the packet
7. reject - block the packet, log it, and then send a TCP reset if the
protocol is TCP or an ICMP port unreachable message if the protocol is UDP.

The sending station should receive back a RST packet.

On 7 July 2011 01:24, HN Nguyen <nhncontact () gmail com> wrote:

I'm using snort (v2.9.0.5) inline with iptables. I have a rule with
"reject" action, but when it triggers, no packet is sent back to the sender
(tcpdump on all interfaces confirm this).

The rule is:
reject tcp any any -> any 7

The log shows:
07/07-00:15:19.553113  [Drop][Priority: 0] {TCP} 192.168.41.122:38805 ->
192.168.1.57:7

This is identical to the behaviour when I change the action to "drop".

Is there anything I'm missing or doing wrong?

Thanks.


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------------------------------------------------------------------------------
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security 
threats, fraudulent activity, and more. Splunk takes this data and makes 
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2d-c2
_______________________________________________
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Please see http://www.snort.org/docs for documentation

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