[Bug 1804861] Re: MTU size defined on /etc/netplan/50-cloud-init.yaml not applied

[Launchpad Bug Tracker]

This bug was fixed in the package netplan.io - 0.95

---------------
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.

 -- Mathieu Trudel-Lapierre <cyphermox at ubuntu.com>  Fri, 14 Dec 2018
16:04:05 -0500

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

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https://bugs.launchpad.net/bugs/1804861

Title:
  MTU size defined on /etc/netplan/50-cloud-init.yaml not applied

Status in netplan:
  Fix Committed
Status in maas package in Ubuntu:
  New
Status in netplan.io package in Ubuntu:
  Fix Released

Bug description:
  netplan version: 0.36.3
  Ubuntu Bionic

  """
  network:
      version: 2
      vlans:
          bond0.810:
              addresses:
              - 10.20.33.3/29
              id: 810
              link: bond0
              mtu: 1500
              nameservers: *id001
  """

  Note: bond0 and its slaves have mtu=9000 configured (there are other
  vlans using 9000, too).

  On netplan source code deployed by the package, only "migrate.py" has
  references to "MTU", however, a command does not exist for "migrate".

  I also tried to add /etc/udev/rules.d/70-net.rules:
  """
  SUBSYSTEM=="net", ACTION=="add", KERNEL=="bond0.810", ATTR{mtu}=="9000", ATTR{mtu}="1500"
  """

  But it doesn't get applied.

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