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Netplan - Définir une IP fixe

Define a fixed IP with Netplan

https://gist.github.com/jdavidzapatab/cf5db0beb6ab4d7e90ba01033aa06a1f

Find the Newtwork Interface name

sudo ip a

Capture the network interface name. It is NOT the lo but something like eth0 or ens160.

Create or Edit a Netplan configuration file

sudo nano /etc/netplan/01-netcfg.yaml

The contents should be like this:

network:
    version: 2
    renderer: networkd
    ethernets:
        eth0:
            addresses:
                - 192.168.1.70/24
            nameservers:
                addresses: [8.8.8.8, 8.8.4.4]
            routes:
                - to: default
                  via: 192.168.1.1

Notice here the eth0. Replace it with your network interface name. Also, set the static IPv4 address in the addresses section, with the correct submask bits size (/24 in this case). The correct IP to set depends on your network configuration so use one that works for you. Also in the routes section, in via, set the correct IPv4 for your Gateway (Router).

Apply the netplan changes

sudo netplan apply

Create a bond - Agregation of two network cards

Netplan can create an agregation of 2 (or more) network cards.

Sources

  • https://www.server-world.info/en/note?os=Ubuntu_22.04&p=bonding
  • https://geekmungus.co.uk/?p=3981

Netplan config file

Confirm network cards names with this command : ip address show

Create or edit /etc/netplan/00-installer-config.yaml and adapt with the configuration below :

# change all like follows
# replace the interface name, IP address, DNS, Gateway to your environment value
# for [mode] section, set a mode you'd like to use
network:
  ethernets:
    enp1s0:
      dhcp4: false
      dhcp6: false
    enp7s0:
      dhcp4: false
      dhcp6: false
  bonds:
    bond0:
      addresses: [10.0.0.30/24]
      routes:
        - to: default
          via: 10.0.0.1
          metric: 100
      nameservers:
        addresses: [10.0.0.10]
        search: [srv.world]
      interfaces:
        - enp1s0
        - enp7s0
      parameters:
        mode: balance-rr
        mii-monitor-interval: 100
  version: 2

Then apply the changes with this command : netplan apply

In this example, the bond will balance the charge between the two cards because we specified mode: balance-rr. But we can also use mode: active-backup if we want to have a spare network card. If the first is down, the second one will goes up with nearly no network down.