With following command you are able to manually add an entry
# ip -6 neigh add <IPv6 address> lladdr <link-layer address> dev <device> |
Example:
# ip -6 neigh add fec0::1 lladdr 02:01:02:03:04:05 dev eth0 |
Like adding also an entry can be deleted:
# ip -6 neigh del <IPv6 address> lladdr <link-layer address> dev <device> |
Example:
# ip -6 neigh del fec0::1 lladdr 02:01:02:03:04:05 dev eth0 |
The tool “ip” is less documentated, but very strong. See online “help” for more:
# ip -6 neigh help
Usage: ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ]
[ nud { permanent | noarp | stale | reachable } ]
| proxy ADDR } [ dev DEV ]
ip neigh {show|flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ] |
Looks like some options are only for IPv4...if you can contribute information about flags and advanced usage, pls. send.