additional action; it only starts NUD (Neighbor
Unreachability Detection) after a packet is sent
to the neighbor.
DELAY: A packet is sent to the neighbor in
STALE state. If the STALE state changes to
DELAY, DELAY will be changed to PROBE if no
neighbor reachability notification is received
within DELAY_FIRST_PROBE_TIME seconds
(5s), the NS will be sent to the neighbor to start
NUD.
PROBE: The NUD is started to check the
reachability of the neighbor. The NS packets are
sent to the neighbor at the interval of
RetransTimer milliseconds until the response
from the neighbor is received or the number of
the sent NSs hits MAX_UNICAST_SOLICIT(3).
?: Unknown state.
/R—indicate the neighbor is considered as a
device
/H: The neighbor is a host.
The reachable time of the neighbor. ‟-„ indicates
that the neighbor is always reachable. Note that
the reachability of a static neighbor depends on
the actual situation. ‟expired‟ indicates that the
lifetime of the neighbor expires, and the
neighbor is waits for the triggering of NUD.
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