Manually Change IP Address in Ubuntu (Versions 18.04 to 24.04)

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Manual IP Change Instructions

Easily update your IP address without server reinstallation. Follow these step-by-step instructions to manually configure the network settings in Ubuntu.

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Access Portal and Launch VNC

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Identify Your Network Interface

1. Open Terminal in the VNC session.
2. Run the command to find your network interface name:

ip a

or

ip link

Take note of the name of the interface you wish to configure, such as ens3 or eth0.

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Edit the Netplan Configuration File

Navigate to the Netplan directory:

cd /etc/netplan/

Open the configuration file (e.g., 50-cloud-init.yaml):

nano /etc/netplan/50-cloud-init.yaml

Note: The filename 50-cloud-init.yaml may differ across servers; for example, it could be 01-network-manager-all.yaml. Ensure you edit the correct file accordingly.

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Change the IP Address

1. Locate the line with the old IP address and change it to your new IP address (e.g., 172.16.30.15).
2. Update the Gateway address in the routes section to the new gateway IP.

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Configure Multiple IPs (Optional)

To add multiple IP addresses, format them like this:

addresses:
        - 172.30.1.16/24
        - 172.30.1.17/24
        - 172.30.1.18/24

Ensure proper indentation in the YAML file.

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SAVE CONFIGURATION

1. Press CTRL + X to save the file.
2. Press Y to confirm changes and then hit Enter to exit.

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Apply Changes

1. Run the following command to apply the new configuration:

sudo netplan apply

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Verify Changes

Check if the new IP is set by running:

ip a

Alternatively, check the specific interface:

ip addr show dev ens3

(Replace ens3 with your network interface name).