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[Sylvain Bauza <sbauza@xxxxxxx>]

Nova is no longer providing L3 and L4 network layers for the VMs unless
you use nova-net which was deprecated in Newton and only working in
Ocata if you use Cells V1.

So I guess your problem is probably related to Neutron but you should
explain more about the issue I guess.

** Also affects: neutron
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1718954

Title:
  network_data.json contains default routes for 2 interfaces

Status in neutron:
  New
Status in OpenStack Compute (nova):
  Opinion

Bug description:
  On an OpenStack Ocata install a guest with two network interfaces
  attached is provided with network_data.json that describes 2 default
  routes.

  See attached network_data.json and (pretty formatted network_data-pretty.json).
  Also note that the reporter ran 'dhclient -v' which created the attached
  dhclient.leases file.  Only one of the dhcp servers returns a 'routers'
  option.  That would seem to indicate that the platform has some distinction.

  Cloud-init renders the networking in /etc/network/interfaces and ends
  up with 2 default routes, which doesn't do what the user wanted.

  This issue was originally raised in freenode #cloud-init.
  There is discussion surrounding it with the original reporter at:
    https://irclogs.ubuntu.com/2017/09/22/%23cloud-init.html

  Related bugs:
   * bug 1717560: allow to have no default route in DHCP host routes

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