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.