Each
row of the detailed NDP Monitoring table for the interface displays
the IPv6 address of a neighbor the firewall has discovered, the
corresponding MAC address, corresponding User ID (on a best-case
basis), reachability Status of the address, and Last Reported date
and time this NDP Monitor received an RA from this IP address. A
User ID will not display for printers or other non-user-based hosts.
If the status of the IP address is Stale, the neighbor is not known
to be reachable, per RFC 4861.