Arguments:

• to ADDRESS (default)

  -- the protocol address of the neighbour. It is either an IPv4 or IPv6 address.

• dev NAME

  -- the interface to which this neighbour is attached.

• lladdr LLADDRESS

  -- the link layer address of the neighbour. LLADDRESS can also be null.

• nud NUD_STATE

  -- the state of the neighbour entry. nud is an abbreviation for ``Neighbour Unreachability Detection''. The state can take one of the following values:

  1. permanent -- the neighbour entry is valid forever and can be only be removed administratively.
  2. noarp -- the neighbour entry is valid. No attempts to validate this entry will be made but it can be removed when its lifetime expires.
  3. reachable -- the neighbour entry is valid until the reachability timeout expires.
  4. stale -- 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.