[Bug 1776228] Re: Duplicate default routes on VMs with multiple NICs

Mon Apr 15 22:32:43 UTC 2019

This bug was fixed in the package netplan.io - 0.96-0ubuntu0.18.10.2

---------------
netplan.io (0.96-0ubuntu0.18.10.2) cosmic; urgency=medium

  * d/p/0001-Partially-revert-the-change-for-enabling-systemd-net.patch:
    Partially revert changes to networkd jobs ordering: leave systemd-networkd
    enabled in multi-user.target instead of network-online.target, as in some
    minimal setups there might be no job requiring network-online.target,
    whereas the natural target to reach for booting is multi-user.target.
    (LP: #1821867)

netplan.io (0.96-0ubuntu0.18.10.1) cosmic; urgency=medium

  * Backport netplan.io 0.96 to 18.10.
  * debian/patches/glib_changes.patch: Patch tests to work again on older GLib.
  * debian/control: adjust Depends for cosmic / re-add nplan package.

netplan.io (0.96-0ubuntu1) disco; urgency=medium

  * New upstream release 0.96.
    - Moved netplan-wpa@ services to earlier at boot (LP: #1819014)
    - Restart services when unconfiguring (LP: #1811868)
    - Use the .nmconnection extension for NM keyfiles (LP: #1817655)
    - Fixed integration tests runner to correctly report failures
    - Enforce integrity for use-routes in networkd backend.
    - Ensure terminal state at end of test (LP: #1817660)
    - Various small test fixes.
    - Fix typos in documentation.
  * debian/control: Update Maintainer for ubuntu upload.

netplan.io (0.95-2) unstable; urgency=medium

  * Set Priority to optional (Closes: #920327).

netplan.io (0.95-1) unstable; urgency=medium

  * New upstream release.
  * Update autopkgtests from the upstream.
  * Add debian/watch following GitHub releases.
  * Add Homepage (Closes: #917233).

netplan.io (0.95) disco; urgency=medium

  * New upstream release:
    - Added support for WPA Enterprise / 802.1x authentication (LP: #1739578)
    - Added support for setting up IP tunnels; supporting the types: ipip,
      gretap, VTI, ISATAP (NetworkManager only), sit, gre, ipip6 and ip6ip6.
      + Fixes sit (ipv6) tunnels using Hurricane Electric (LP: #1799487)
    - Add support to override networkd UseMTU setting (LP: #1807273)
    - Generate output files in dependency order
    - Refactored unit and integration tests, along with various cleanups.
    - Add DHCP overrides to control route usage and default metric for DHCP
      routes. (LP: #1776228)
    - Mitigate against bad matching on devices behind bonds then they share
      the same MAC from a physical interface. (LP: #1804861)
    - Added snapcraft.yaml.

netplan.io (0.90.1) disco; urgency=medium

  * Do not assume /etc/network exists in postinst, as netbase 5.5 no longer
    creates it.
  * netplan/cli/commands/ip.py: fix a flake.

netplan.io (0.90) disco; urgency=medium

  * New upstream release:
    - build: fixes for building on RPM-based distros
    - build: code prettiness changes (make indentation consistent)
    - Fix device name-changes detection (LP: #1770082)
    - Add support for IPv6 Privacy Extensions (LP: #1750392)
    - Add dhcp{4,6}-overrides to control DNS, NTP, hostname updates via DHCP
      (LP: #1759014)
    - Clarify MAC and MTU setting requirements (LP: #1800668)
    - Various documentation fixes (LP: #1800669)
    - Improve error reporting to give clearer messages and context
      (LP: #1800670)
    - Skip non-physical/bond interfaces when applying renames (LP: #1802322)

 -- Mathieu Trudel-Lapierre <cyphermox at ubuntu.com>  Thu, 28 Mar 2019
13:57:46 -0400

** Changed in: netplan.io (Ubuntu Cosmic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1776228

Title:
  Duplicate default routes on VMs with multiple NICs

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in netplan.io source package in Bionic:
  Fix Committed
Status in netplan.io source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  DHCP configurations where custom settings (routes) need to be applied. This is a subset of the changes presented in bug 1759014.

  [Test case]
  1) Configure netplan for the particulars of the network by configuring an appropriate dhcp{4,6}-override stanza:

  network:
    version: 2
    ethernets:
      engreen:
        dhcp4: true
        dhcp4-overrides:
          use-routes: false
          route-metric: 3333

  Additionally, if so required, add a custom routes to the
  configuration. e.g.

        routes:
          - to: 10.0.0.0/16
            via: 13.4.55.78

  (See https://netplan.io/reference#dhcp-overrides for the available
  options)

  2) Run 'netplan apply' or reboot to have the configuration applied.
  3) Validate that the routes / DNS are properly ignored and/or replaced by the defined values.

  [Regression potential]
  Minimal; this adds new values to the configuration generated for networkd or NetworkManager. Existing configurations will remain unchanged, but new configurations using the dhcp{4,6}-overrides fields will benefit from additional flexibility.

  ---

  I'm facing issues with OpenStack VMs built from Ubuntu 18.04 cloud
  image and configured with multiple NICs. I have a solution working on
  16.04, which doesn't do any more since the introduction of netplan.

  Requirements:

   - Multiple interfaces connected to different networks.
   - All NICs configured via DHCP to ensure IP address, but also parameters like MTU adapt to the environment automatically.
   - Default route is supposed to use one specific NIC and network.

  The solution on 16.04 was customization of /etc/dhcp/dhclient.conf,
  such that all unique parameters are retrieved from only that
  interface. Example with ens3 being the intended authoritative
  interface:

    option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
    send host-name = gethostname();
    request subnet-mask, broadcast-address, time-offset,
            netbios-name-servers, netbios-scope, interface-mtu,
            rfc3442-classless-static-routes;
    interface "ens3" { request routers, domain-name, domain-name-servers, domain-search, host-name,
                       dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers, ntp-servers; }

  This does no longer work with netplan. I couldn't figure any netplan
  properties to configure DHCP client to that granularity. And
  /etc/dhcp/dhclient.conf no longer seems to be honored. As I can see in
  VM startup console log, each interface is getting default route
  assigned and the system remains unresponsive most of the times.

  How am I supposed to solve this on a netplan managed system?

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