Network cycles interfaces on DCP lease prolongation.

[rew]

I'm running a VMWARE virutal machine. Every time the host renews its DHCP lease, the virtual interface of the VM is cycled.

Jun 7 13:31:47 NetworkManager[1041]: <info> [1465299107.5131] address 192.168.xxx.x
Jun 7 13:31:47 NetworkManager[1041]: <info> [1465299107.5131] lease time 6000
Jun 7 13:31:47 NetworkManager[1041]: <info> [1465299107.5132] nameserver '192.168.xxx.x'
Jun 7 13:31:47 NetworkManager[1041]: <info> [1465299107.5132] dhcp4 (eth0): state changed bound -> bound
Jun 7 13:31:47 assurancetourix kernel: [1870761.608743] userif-3: sent link down event.
Jun 7 13:31:47 assurancetourix kernel: [1870761.608745] userif-3: sent link up event.

I suspect that the state change bound->bound causes a short (unnoticable to humans) interruption of the networking config, which the virtual interface for the VM notices. (in the VM the network then goes down for about ten seconds! Noticeable to humans... ).

Description: Ubuntu 16.04 LTS

network-manager:
  Installed: 1.2.0-0ubuntu0.16.04.2
  Candidate: 1.2.0-0ubuntu0.16.04.2
  Version table:
 *** 1.2.0-0ubuntu0.16.04.2 500
        500 http://nl.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.1.93-0ubuntu4 500
        500 http://nl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages