From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: ip neigh output are incomplete, 3.4.1
Date: Thu, 07 Jun 2012 16:22:15 +0200
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Cc: netdev@vger.kernel.org, Stephen Hemminger <shemminger@vyatta.com>
To: Denys Fedoryshchenko <denys@visp.net.lb>
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On Thu, 2012-06-07 at 16:09 +0300, Denys Fedoryshchenko wrote:
> I have a host with large L2 network (around 100 L2TP tunnels bridged to 
> one interface). 3.4.1 kernel, x86, 32bit.
> 
> ip route add 172.16.0.0/16 dev br0
> 
> GlobalNAT ~ # cat /proc/net/arp |wc -l
> 2
> GlobalNAT ~ # cat /proc/net/arp |wc -l
> 3575
> GlobalNAT ~ # cat /proc/net/arp |wc -l
> 4613
> GlobalNAT ~ # cat /proc/net/arp |wc -l
> 5117
> 
> And at same time
> GlobalNAT /config # ip neigh |wc -l
> 52

Thansk for the report, I am testing a fix and send patch ASAP.