I am confused by Stephane's orginal opening statement that

| Prior to the switch to nplan, systems (in my case containers) would
| DHCP for IPv4 and let the kernel do IPv6 auto-configuration whenever a
| router advertisement comes in.

I opened bug 1732002 with information to the contrary.
On my system, 16.04 images do *not* get ipv6 addresses, but current
artful and bionic images do.

I'm raising this because it seems that it was used for justification
of a change to a stable release.

$ lxc network show lxdbr0
config:
  ipv4.address: 10.75.205.1/24
  ipv4.nat: "true"
  ipv6.address: fd42:eee5:7c43:3d62::1/64
  ipv6.dhcp.stateful: "true"

$ lxc list "(artful|xenial)-demo"
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
|    NAME     |  STATE  |         IPV4         |                      IPV6      
                |    TYPE    | SNAPSHOTS |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| artful-demo | RUNNING | 10.75.205.208 (eth0) | 
fd42:eee5:7c43:3d62:3a42:611c:3f6f:1184 (eth0) | PERSISTENT | 0         |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| xenial-demo | RUNNING | 10.75.205.143 (eth0) |                                
                | PERSISTENT | 0         |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+

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https://bugs.launchpad.net/bugs/1717404

Title:
  IPv6 support regresses with nplan transition

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