From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philip Craig <philipc@snapgear.com>
Subject: Re: icmp and ip_conntrack
Date: Mon, 06 Mar 2006 11:45:45 +1000
Message-ID: <440B9449.70407@snapgear.com>
References: <200603032158.22452.sov.rbsec@gmail.com>
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To: Oleg <sov.rbsec@gmail.com>
Cc: netfilter@lists.netfilter.org

On 03/04/2006 04:58 AM, Oleg wrote:
> Is it possible that when successfully pinging server, which has conntrack 
> enabled, cat /proc/net/ip_conntrack not show icmp entries?
> 
> All ping requests/replyes goes both sides (seen in tcpdump)

There should only be 1 reply packet, so the conntrack is destroyed immediately.
http://iptables-tutorial.frozentux.net/iptables-tutorial.html#ICMPCONNECTIONS