As long as we are talking about ARP, I want to mention that IPv6 does not
use ARP. Instead, it uses NDP (neighbor discovery protocol) with some
ICMPv6 multicast messages, and the "modern" iproute2 tool which works
across ipv4 and ipv6 is "ip n", where n stands for "neighbour".
>From the manpage
For future reference for anyone playing along at home, if you discover an dup
ip addr listing in the arp table cache, you can just manually delete it from
the command line. A quick & easy Google search will get you the command.
Also, dup ip addrs are very bad because a broadcast loop storm can
