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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1736975 Title: netplan does not bring up anonymous bridge on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1736975/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs