This tool shows the IPv6 Network Neighbor Table. The
table is populated using the ICMPv6 Neighbor Discovery (ND)
protocol from RFC 2461 and other sources. It shows both
static broadcast and dynamic IP addresses. The IPv6
addresses are shown along with the physical address. The
physical address can be a MAC address for an actual network
card or in the case of tunnelling adapters like Teredo or
6to4, it can be an IPv4 address followed by the UDP port
number. If it is a MAC address, we can show the interface
manufacturer if it exists. The type of entry is shown along
with the interface names. The last column is the IPv6
ifIndex column which also happens to be the Scope ID for the
interface. Link Local addresses are shown when used. As with
an ARP table, things age so you see notations like 'stale'.
The network neighbors table is the IPv6 version of an IPv4 ARP Cache table except with much more information.
It also uses Multicast Ping (mPing) to freshen the table with the addresses of nearby IPv6 devices.