[Bug 1736975] [NEW] netplan does not bring up anonymous bridge on boot

[Colin]

Public bug reported:

Configuring "/etc/netplan/01-netcfg.yaml" with an anonymous bridge seems
to require running "ip link set dev br0 up" to bring the bridge up after
boot. A bridge configured with an IP address is automatically up after
boot.

This is only a problem if you want an anonymous bridge which comes up
automatically after boot. For example, if you preferred to isolate host
traffic from your autostarting virtual machine traffic.

Configuration that results in the bridge being down after boot:
network:
  version: 2
  renderer: networkd
  ethernets:
    enp22s2:
      dhcp4: yes
    enp22s3:
      dhcp4: no
  bridges:
    br0:
      interfaces: [enp22s3]
      dhcp4: false
      parameters:
        stp: false
        forward-delay: 0

Enabling DHCP results in a bridge that is automatically up after boot:
network:
  version: 2
  renderer: networkd
  ethernets:
    enp22s2:
      dhcp4: yes
    enp22s3:
      dhcp4: no
  bridges:
    br0:
      interfaces: [enp22s3]
      dhcp4: true
      parameters:
        stp: false
        forward-delay: 0

Setting a static IP address results in a bridge that is automatically up after boot:
network:
  version: 2
  renderer: networkd
  ethernets:
    enp22s2:
      dhcp4: yes
    enp22s3:
      dhcp4: no
  bridges:
    br0:
      interfaces: [enp22s3]
      dhcp4: false
      addresses: [192.168.1.100/24]
      parameters:
        stp: false
        forward-delay: 0

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: nplan 0.30
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
Date: Thu Dec  7 11:06:25 2017
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=screen
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nplan (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1736975

Title:
  netplan does not bring up anonymous bridge on boot

Status in nplan package in Ubuntu:
  New

Bug description:
  Configuring "/etc/netplan/01-netcfg.yaml" with an anonymous bridge
  seems to require running "ip link set dev br0 up" to bring the bridge
  up after boot. A bridge configured with an IP address is automatically
  up after boot.

  This is only a problem if you want an anonymous bridge which comes up
  automatically after boot. For example, if you preferred to isolate
  host traffic from your autostarting virtual machine traffic.

  Configuration that results in the bridge being down after boot:
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp22s2:
        dhcp4: yes
      enp22s3:
        dhcp4: no
    bridges:
      br0:
        interfaces: [enp22s3]
        dhcp4: false
        parameters:
          stp: false
          forward-delay: 0

  Enabling DHCP results in a bridge that is automatically up after boot:
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp22s2:
        dhcp4: yes
      enp22s3:
        dhcp4: no
    bridges:
      br0:
        interfaces: [enp22s3]
        dhcp4: true
        parameters:
          stp: false
          forward-delay: 0

  Setting a static IP address results in a bridge that is automatically up after boot:
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp22s2:
        dhcp4: yes
      enp22s3:
        dhcp4: no
    bridges:
      br0:
        interfaces: [enp22s3]
        dhcp4: false
        addresses: [192.168.1.100/24]
        parameters:
          stp: false
          forward-delay: 0

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: nplan 0.30
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.5
  Architecture: amd64
  Date: Thu Dec  7 11:06:25 2017
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=screen
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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