** Tags added: xenial

** Package changed: ubuntu => network-manager (Ubuntu)

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https://bugs.launchpad.net/bugs/1577382

Title:
  Network fails to start if VLAN have bigger MTU than default

Status in network-manager package in Ubuntu:
  New

Bug description:
  Hello,

  Looks like a bug for me.
  If I configure interface VLAN with bigger MTU than 1500, which is default, 
interface with VLAN fail to start.

  May  2 14:40:16 demo-host systemd[1]: Started ifup for eno3.1009.
  May  2 14:40:16 demo-host sh[2184]: Set name-type for VLAN subsystem. Should 
be visible in /proc/net/vlan/config
  May  2 14:40:16 demo-host sh[2184]: RTNETLINK answers: Numerical result out 
of range
  May  2 14:40:16 demo-host sh[2184]: Failed to bring up eno3.1009.

  auto eno3
  iface eno3 inet manual
   mtu 1550

  auto eno3.805
  iface eno3.805 inet manual
          vlan-raw-device eno3
          mtu 1500

  auto eno3.1009
  iface eno3.1009 inet static
          vlan-raw-device eno3
          address 10.20.30.7
          netmask 255.255.255.0
          mtu 1550

  eno3 and eno3.805 starts successfully, but eno3.1009 not. If I look at
  syslog, I can see, that interface boot order goes from last interface
  in config to first:

  ~# cat /var/log/syslog|grep -i "Started ifup for eno3"
  May  2 14:40:16 demo-host systemd[1]: Started ifup for eno3.1009.
  May  2 14:40:16 demo-host systemd[1]: Started ifup for eno3.805.
  May  2 14:40:16 demo-host systemd[1]: Started ifup for eno3.

  This is really strange, I suppose it should have some kind of order in such 
cases.
  If I change configuration, e.g., eno3.1009 configure before eno3, host boots 
successfully with configured VLAN, but I suppose it could fail in some cases 
anyway.

  So looks like we need some kind of "order" configuration in which we
  can setup after what cases we can take up interface.

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