Network Bridge using Netplan (Ubuntu)

A bridge created by a netplan file will persist after reboot. A basic Ubuntu install creates a netplan file at /etc/netplan/00-installer-config.yaml. This file can be edited to add the br0External bridge.

1. Edit netplan sudo nano /etc/netplan/00-installer-config.yaml
2. Check for errors sudo netplan generate
3. Apply netplan sudo netplan apply

• Example netplan which creates a bridge using the eno1 device.

network:
  ethernets:
    eno1:
      dhcp4: false
  bridges:
    br0External:
      interfaces:
        - eno1
  version: 2

• Example netplan which creates a bridge using the eno1 device and configures the bridge via DHCP.

network:
  ethernets:
    eno1:
      dhcp4: false
  bridges:
    br0External:
      interfaces:
        - eno1
      dhcp4: true
  version: 2

• Example netplan which creates a bridge using the enp81s0f0 device and configures the bridge with an IP address, nameserver, and a default route:

network:
  ethernets:
    enp81s0f0:
      dhcp4: false
  bridges:
    br0External:
      interfaces:
        - enp81s0f0
      addresses:
        - 192.168.1.2/16
      nameservers:
        addresses:
          - 192.168.1.1
      routes:
        - to: default
          via: 192.168.1.1
      dhcp4: false
      dhcp6: false  
  version: 2