From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven M Campbell <Netfilter@SCampbell.net>
Subject: Re: Packets Counting
Date: Wed, 16 Mar 2005 12:54:37 -0500
Message-ID: <423872DD.8020009@SCampbell.net>
References: <4238655B@webmail.wichita.edu>
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To: iptables <netfilter@lists.netfilter.org>

M. A. Imam wrote:

>Hi,
>
>How can i count the number of packets on an interface evry 2 or 5 seconds. and 
>i want to count only specific packets like only arriving packets from port 
>5001
>
>Any ideas...
>
>Muhammad 
>
>
>  
>
iptables -L -v will show packet counts and byte counts on rules so, 
using your specific example and assuming you meant tcp port 5001

First create a matching rule that has no target
#  iptables -I INPUT 1 -p tcp --dport 5001

Then, every x seconds run
iptables -L -v -n
and parse out the counter of interest.

Hope that helps,
SCampbell