1. Displaying neighbors using “ip”

With following command you can display the learnt or configured IPv6 neighbors

# ip -6 neigh show [dev <device>]

The following example shows one neighbor, which is a reachable router

# ip -6 neigh show
fe80::201:23ff:fe45:6789 dev eth0 lladdr 00:01:23:45:67:89 router nud reachable