Subject: Re: "ip neigh show" not showing arp cache entries?

From: Patrick McHardy <[email-masked]>
Date: Tue, 18 Dec 2007 00:51:36 +0100

Chris Friesen wrote:
> Patrick McHardy wrote:
> 
>>  From a kernel perspective there are only complete dumps, the
>> filtering is done by iproute. So the fact that it shows them
>> when querying specifically implies there is a bug in the
>> iproute neighbour filter. Does it work if you omit "all"
>> from the ip neigh show command?
> 
> Omitting "all" gives identical results.  It is still missing entries 
> when compared with the output of "arp".

In that case the easiest way to debug this is probably if you
add some debugging to ip/ipneigh.c:print_neigh() since I'm
unable to reproduce this problem. A printf for all the filter
conditions (=> return 0) at the top should do.