linux-kernel - Re: "ip neigh show" not showing arp cache entries?

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Message-ID: <20071218003312.GR11220@postel.suug.ch>
Date:	Tue, 18 Dec 2007 01:33:12 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Chris Friesen <cfriesen@...tel.com>, yoshfuji@...ux-ipv6.org,
	dada1@...mosbay.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: "ip neigh show" not showing arp cache entries?

* Patrick McHardy <kaber@...sh.net> 2007-12-18 00:51
> 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.

Alternatively, you can download libnl and run

	NLCB=debug src/nl-neigh-dump brief

and check if the netlink message is sent by the kenrel for the
neighbour in question. 
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