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

[Patrick McHardy]

Thomas Graf wrote:
> * Patrick McHardy <kaber@xxxxxxxxx> 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. 


It should be, according to Chris, "ip neigh show <ip>" does
show the missing entries, and in case of neighbour entries
all filtering is done in userspace.


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