[Bug 1942375] Re: test failure with some network configurations

[Mathew Hodson]

** Changed in: vip-manager (Ubuntu)
   Importance: Undecided => Low

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Title:
  test failure with some network configurations

Status in vip-manager package in Ubuntu:
  Confirmed
Status in vip-manager package in Debian:
  Unknown

Bug description:
  vip-manager behavior_test can fail, depending on the device network
  configuration.  If the test device has a network device of type ether
  and a zero hardware address, and it selects this network device as the
  one to use, the tests will fail.

  Example failure:

  https://autopkgtest.ubuntu.com/results/autopkgtest-
  impish/impish/armhf/v/vip-manager/20210901_213607_5779b@/log.gz

  2021/09/01 21:35:37 Problems with generating the virtual ip manager: Cannot run vip-manager on the loopback device
  as its hardware address is the local address (00:00:00:00:00:00),
  which prohibits sending of gratuitous ARP messages

  Here is abbreviated output of 'ip link show' for one such test device:

  3: gretap0 at NONE: <BROADCAST,MULTICAST> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
      link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
  44262: eth0 at if44263: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1458 qdisc noqueue state UP mode DEFAULT group default qlen 1000
      link/ether 00:16:3e:0f:a3:f7 brd ff:ff:ff:ff:ff:ff link-netnsid 0

  In this example, gretap0 will be the chosen network device, but will
  fail at runtime of vip-manager due to the all-zeros mac address.
  Instead, eth0 should be chosen.

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