Daniel's Notes

netplan  is the default network configuration system for new installs of Ubuntu 18.04 (Bionic). It uses YAML to configure network interfaces, instead of  /etc/network/interfaces . I've been testing netplan for a while, so in light of the release of Bionic, here's my set of examples, caveats, tips and tricks. Contents General tips and tricks Matching Basic IPv4 configuration MTUs Bridges, Bonds and VLANs Wifi IPv6 Supplementing or replacing netplan Going Further General tips and tricks Tabs are not allowed in YAML and currently you get a very useless error message if you use them: "Invalid YAML at //etc/netplan/10-bridge.yaml line 5 column 0: found character that cannot start any token". If you see this, check for tabs! Indentation matters in YAML. Make sure that things line up where they're supposed to. Rebooting is somewhat more reliable than netplan apply , but make sure  there are no errors in your YAML before you reboot or no network ...

netplan is the default network configuration system for new installs of Ubuntu 18.04 (Bionic). Introduced as the default in Artful, it replaces /etc/network/interfaces . One question that gets asked repeatedly is: "How do I set up an anonymous bridge in netplan?" (An anonymous bridge, I discovered, is one where the bridge doesn't have an IP address; it's more akin to a switch or hub.) It's been approached on  Launchpad , and comes up on the IRC channel. If you're trying to create a bridge without an IP address, the obvious first thing to try is this: network: version: 2 ethernets: ens8: match: macaddress: 52:54:00:f9:e9:dd ens9: match: macaddress: 52:54:00:56:0d:ce bridges: br0: interfaces: [ens8, ens9] This is neat, plausible, and wrong - the bridge will be created but will stay 'down'. Per ip a : 5: br0: <BROADCAST,MULTICAST> mtu 15...