The first thing you must do is locate the name of your network device, DHCP IP address and default Gateway. For that, issue the commands and note down.
To find network interface
ip -c link show
You should at least see two devices, lo (for loopback) and another named device (such as enp0s3).
To find IP address
hostname -I
To find Gateway
ip route | grep default
Next, let’s back up the current network configuration file with the command:
sudo cp /etc/network/interfaces ~/
Open the configuration file for editing with the command:
sudo nano /etc/network/interfaces
With the interfaces file open for editing, you should see a DHCP configuration that looks like this:
# The primary network interface
allow-hotplug enp3s0
iface enp3s0 inet dhcp
Comment that block out so it looks like this:
# The primary network interface
# allow-hotplug enp3s0
# iface enp3s0 inet dhcp
Now, we can add the necessary configuration for a static IP address. Let’s configure enp0s3 to use the address 192.168.0.2, with a gateway of 192.168.0.1, and a DNS nameserver of 8.8.4.4 8.8.8.8 That configuration will look like this:
# The primary network interface
auto enp3s0
iface enp3s0 inet static
address 192.168.0.2
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 8.8.4.4 8.8.8.8
Make sure to edit the above configuration to match your network scheme. Save and close the file.
Finally, restart the networking service with the command:
sudo systemctl restart networking
Make sure the networking configuration is correct, by issuing the command:
hostname -I
You should see the static IP address you configured. You’re good to go.
