IP Neighbor cannot force delete in batch mode

[Justin Lamp]

Hey there,

we encountered an error where the ip command in batch mode will fail when trying to delete neighbor entries that aren't there anymore even though the `-force` option is active.

$ ip -force -b /dev/stdin <<EOF
neighbor del 10.244.23.116 dev br-ex
address del 10.244.23.199 dev bgp-nic
EOF

This seems to be similar to the patch submitted by a cumulus engineer: https://<email address hidden>/

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/ipneigh.c#n213

Unfortunately this feature is very important to us, as we need to make sure that the entries are gone for good and need the speed of the batch mode to process the updates.

Thanks and best regards,
Justin Lamp