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Ubuntu Network Configuration

Battambang, Cambodia

Check your network settings​

ip a
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 74:d4:35:c7:c2:20 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.53/24 brd 192.168.2.255 scope global enp3s0
       valid_lft forever preferred_lft forever

The current IP address for the Ethernet interface is 192.168.2.53. And the gateway is 192.168.2.1 as seen below:

ip route
default via 192.168.2.1 dev enp3s0 proto static

Configure Netplan​

ls /etc/netplan/
00-installer-config.yaml

sudo nano /etc/netplan/00-installer-config.yaml

Delete / overwrite the configuration inside this file, e.g. :

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp3s0:
      addresses:
        - 192.168.2.110/24
      gateway4: 192.168.2.5
      nameservers:
        addresses:
          - 192.168.2.5
          - 8.8.4.4
        search:
          - workgroup
  version: 2

Test and Apply your Settings​

sudo netplan try
Warning: Stopping systemd-networkd.service, but it can still be activated by:
  systemd-networkd.socket
Do you want to keep these settings?

Press ENTER before the timeout to accept the new configuration

Changes will revert in 107 seconds
Configuration accepted.

If there is no issue, it will return the configuration accepted message. If the configuration file fails the test, it will be reverted to a previous working configuration.

sudo netplan apply

Verify your changes:

ip a
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 74:d4:35:c7:c2:20 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.110/24 brd 192.168.2.255 scope global enp3s0
       valid_lft forever preferred_lft forever
    inet6 fe80::76d4:35ff:fec7:c220/64 scope link 
       valid_lft forever preferred_lft forever


ip route
default via 192.168.2.5 dev enp3s0 proto static

Change Hostname​

hostname
hostnamectl set-hostname new-hostname
nano /etc/hosts

127.0.1.1 new-hostname
hostnamectl