Linux IPv6 HOWTO (en)
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# 8.1. 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

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