* Patrick McHardy [off-list ref] 2007-12-18 00:51

Chris Friesen wrote:

quoted

Patrick McHardy wrote:

quoted

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.