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Description: 2.6. Practice: Configuring IPv6 Networking
Step 10 shows DUP! packets for one IPv6 IP address. Does this occur because of the netns tricks we are using? It might be worth a note somewhere that explains why we see that.

2.5. IPv6 Networking Configuration shows this as well under the IPv6 Troubleshooting Tools heading, Connectivity subheading.
[root@rhel7 ~]# ping6 ff02::1%eth1
PING ff02::1%eth1(ff02::1) 56 data bytes
64 bytes from fe80::78cf:7fff:fed2:f97b: icmp_seq=1 ttl=64 time=22.7 ms
64 bytes from fe80::f482:dbff:fe25:6a9f: icmp_seq=1 ttl=64 time=30.1 ms (DUP!)
...

It might be good to put the note there.