I'm going to have to put this on the back burner for a while, sorry.
I've got a ton of other stuff to do before I can return to this. I want
to set up a VM that I can snapshot and destroy for any testing that you
need.

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https://bugs.launchpad.net/bugs/1605137

Title:
  Can still ping container IP address after removing container

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Using version 2.0.3-0ubuntu2~ubuntu16.04.1~ppa1

  I created a container, and then put a tagged vlan on top of lxdbr0 so
  that I can talk to the host and other containers on a second network.

  I gave the host's lxdbr0.1215 an IP address, and made eth0.1215 in the
  container also with its own IP address.

  After removing the container, I can still ping the address on the
  VLAN!  It also responds with duplicates:

  $ arping -I lxdbr0.1215 192.168.15.20
  ARPING 192.168.15.20 from 192.168.15.1 lxdbr0.1215
  Unicast reply from 192.168.15.20 [00:16:3E:B1:9B:0C]  0.599ms
  Unicast reply from 192.168.15.20 [00:16:3E:B1:9B:0C]  0.607ms
  Unicast reply from 192.168.15.20 [00:16:3E:B1:9B:0C]  0.609ms
  Unicast reply from 192.168.15.20 [00:16:3E:B1:9B:0C]  0.534ms
  Unicast reply from 192.168.15.20 [00:16:3E:B1:9B:0C]  0.541ms

  $ ping 192.168.15.20
  PING 192.168.15.20 (192.168.15.20) 56(84) bytes of data.
  64 bytes from 192.168.15.20: icmp_seq=1 ttl=64 time=0.108 ms
  64 bytes from 192.168.15.20: icmp_seq=1 ttl=64 time=0.126 ms (DUP!)
  64 bytes from 192.168.15.20: icmp_seq=1 ttl=64 time=0.144 ms (DUP!)
  64 bytes from 192.168.15.20: icmp_seq=2 ttl=64 time=0.051 ms

  Bizarrely:

  $ nmap 192.168.15.20

  Starting Nmap 7.01 ( https://nmap.org ) at 2016-07-21 19:01 AEST
  Note: Host seems down. If it is really up, but blocking our ping probes, try 
-Pn
  Nmap done: 1 IP address (0 hosts up) scanned in 3.02 seconds

  (Supplying -Pn shows all ports are closed.)

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