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[Jay Vosburgh <1584092@xxxxxxxxxxxxxxxxxx>]

I haven't tested this patch, but fanctl had the same issue, and I
believe the fix is that the subnet math has to be "overlay_width + ( 32
- underlay_width )", not "overlay_width + underlay_width".

Patch attached.

** Patch removed: "fanatic patch"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-fan/+bug/1584092/+attachment/4667027/+files/fanatic.patch

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https://bugs.launchpad.net/bugs/1584092

Title:
  Docker misconfigured when using non-default overlay/underlay netmask
  size

Status in ubuntu-fan package in Ubuntu:
  New

Bug description:
  Fan allows for variable sized subnet map sizes.  For example, if I
  want to map a /24 to a /16 instead of the default /16 to /8, Fan
  supports this.  However, when configuring this via fanatic, I see that
  docker configuration fails.  In /etc/default/docker, the --fixed-cidr
  flag is defined incorrectly.

  $ sudo fanatic
  Welcome to the fanatic fan networking wizard.  This will help you set
  up an example fan network and optionally configure docker and/or LXD touse this network.  See fanatic(1) for more details.

  Configure fan underlay (hit return to accept, or specify alternative) [192.168.0.0/16]: 192.168.1.0/24
  Configure fan overlay (hit return to accept, or specify alternative) [250.0.0.0/8]: 250.99.0.0/16
  Create LXD networking for underlay:192.168.1.0/24 overlay:250.99.0.0/16 [Yn]: Y
  Profile fan-250-99 created
  Create docker networking for underlay:192.168.1.0/24 overlay:250.99.0.0/16 [Yn]: Y
  Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
  Test LXD networking for underlay:192.168.1.10/24 overlay:250.99.0.0/16
  (NOTE: potentially triggers large image downloads) [Yn]: n
  Test docker networking for underlay:192.168.1.10/24 overlay:250.99.0.0/16
  (NOTE: potentially triggers large image downloads) [Yn]: n
  This host IP address: 192.168.1.10
  Remote test host IP address (none to skip): 
  /usr/sbin/fanatic: Testing skipped

  $ grep "DOCKER_OPTS" /etc/default/docker
  # Use DOCKER_OPTS to modify the daemon startup options.
  #DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
  DOCKER_OPTS=" -b fan-250-99 --mtu=1450 --iptables=false --fixed-cidr=250.99.10.0/40"

  May 20 05:15:30 macbook docker[27364]:
  time="2016-05-20T05:15:30.411933688-07:00" level=fatal msg="Error
  starting daemon: Error initializing network controller: invalid CIDR
  address: 250.99.10.0/40"

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