Public bug reported:

SRU Justification (Zesty/Xenial)

Impact: When /etc/network/fan contains two entries for the same mapping
(for example on mapping for the generic network mapping and one for a
specific interface) it will try to set up the same Fan bridge twice.

Fix: Add a break which exits the setup loop once there has been one
successful run.

Testcase: If in an environment that uses one of the 192.168.0.0/16 subnets, and 
host has for example a 192.168.1.0/24 address. Then trying to use
 fanatic enable-fan -u 192.168.1.x/24 -o 250.0.0.0/8
would show an error now and with the fix applied work ok.

** Affects: ubuntu-fan (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1707610

Title:
  fanctl does not stop setup on first match

Status in ubuntu-fan package in Ubuntu:
  New

Bug description:
  SRU Justification (Zesty/Xenial)

  Impact: When /etc/network/fan contains two entries for the same
  mapping (for example on mapping for the generic network mapping and
  one for a specific interface) it will try to set up the same Fan
  bridge twice.

  Fix: Add a break which exits the setup loop once there has been one
  successful run.

  Testcase: If in an environment that uses one of the 192.168.0.0/16 subnets, 
and host has for example a 192.168.1.0/24 address. Then trying to use
   fanatic enable-fan -u 192.168.1.x/24 -o 250.0.0.0/8
  would show an error now and with the fix applied work ok.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-fan/+bug/1707610/+subscriptions

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