Neighbor entry validation is currently delayed.
Max number of probes exceeded without success, neighbor validation has ultimately failed.
The neighbour entry has not (yet) been validated/resolved.
The neighbour entry is valid. No attempts to validate this entry will be made but it can be removed when its lifetime expires.
This is a pseudo state used when initially creating a neighbour entry or after trying to remove it before it becomes free to do so.
The neighbour entry is valid forever and can be only be removed administratively.
Neighbor is being probed.
The neighbour entry is valid until the reachability timeout expires.
The neighbour entry is valid but suspicious.
This option to ip neigh does not change the neighbour state if it was valid and the address
is not changed by this command.
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Neighbour Unreachability Detection (NUD) states.