LXD-LXC.bridged-network.md

Configure LXD/LXC bridged network

there are several methods to configure bridged networking on Linux/Ubuntu. Why bridged networking for LXD? Well, macvlan is easier to configure, but you will not be able to reach the container via SSH from the LXD host. To enable virtual networking bridged network is the way to go. Some will argue about this...

Create network bridge with nmcli

nmcli - package is preinstalled on Ubuntu server

• see man nmcli for manual
• see nmcli --help for help

Create network bridge

$ sudo nmcli con add ifname br0 type bridge con-name br0 
$ sudo nmcli con add type bridge-slave ifname eno1 master br0 
$ nmcli connection show

Disable STP:

$ sudo nmcli con modify br0 bridge.stp no 
$ nmcli con show 
$ nmcli -f bridge con show br0

The following information will be displayed after issuing the last command:

bridge.mac-address: -- 
bridge.stp: no 
bridge.priority: 32768 
bridge.forward-delay: 15 
bridge.hello-time: 2 
bridge.max-age: 20 
bridge.ageing-time: 300 
bridge.multicast-snooping: yes

Disable the standard network connection. The bridged connection should start automatically:

$ sudo nmcli con down standardconnection1
$ sudo nmcli con up br0

To ensure that the bridge is started on reboot the standard connection may be deleted using nmtui :

$ sudo nmtui

Assign fixed IP to bridge

$ sudo nmcli connection modify br0 ipv4.addresses '192.168.2.200/24'
$ sudo nmcli connection modify br0 ipv4.gateway '192.168.2.1'
$ sudo nmcli connection modify br0 ipv4.dns '192.168.2.1'
$ sudo nmcli connection modify br0 ipv4.dns-search '9.9.9.9'
$ sudo nmcli connection modify br0 ipv4.method manual

Alternatively IP's may be assigned in DHCP using router interface