Debian 11
Step 1: Disable automatic network configuration
Open the following file path with a text editor:
sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
Enter the following line, then save and exit the editor:
network: {config:disabled}
Creating this configuration file will prevent changes to your network configuration from being made automatically.
Step 2: Create a backup
By default, the configuration file is located in the path etc/network/interfaces.d.
In our example, our file is called 50-cloud-init, so we make a copy of the 50-cloud-init file using the following command:
sudo cp /etc/network/interfaces.d/50-cloud-init /etc/network/interfaces.d/50-cloud-init.bak
In case of a mistake, you will be able to revert the changes, using the commands below:
sudo rm -f /etc/network/interfaces.d/50-cloud-init
sudo cp /etc/network/interfaces.d/50-cloud-init.bak /etc/network/interfaces.d/50-cloud-init
Step 3: Edit the configuration file
The first step is to verify your network interface name with this command:
Next, open the network configuration file for editing with the following command:
sudo nano /etc/network/interfaces.d/50-cloud-init
To configure your Additional IP, you need to add a virtual interface or ethernet alias to your network interface. In our example, our interface is called eth0, so our first alias is eth0:0. Do this for each Additional IP you wish to configure.
Do not modify the existing lines in the configuration file, simply add your Additional IP to the file as follows, replacing NETWORK_INTERFACE, ID and ADDITIONAL_IP with your own values:
auto NETWORK_INTERFACE:ID
iface NETWORK_INTERFACE:ID inet static
address ADDITIONAL_IP
netmask 255.255.255.255
If you are configuring more than one Additional IP, your configuration file should look like this:
auto NETWORK_INTERFACE:ID
iface NETWORK_INTERFACE:ID inet static
address ADDITIONAL_IP1
address ADDITIONAL_IP2
netmask 255.255.255.255
Configuration example:
auto eth0:0
iface eth0:0 inet static
address 203.0.113.0
netmask 255.255.255.255
Step 4: Restart the interface
Apply the changes with the following command:
sudo systemctl restart networking
Debian 12, Ubuntu 22.04 and following
The configuration file for your Additional IP addresses is located in the folder /etc/netplan/. In this example it is called 50-cloud-init.yaml.
The best practice approach is to create a separate configuration file to set up Additional IP addresses. This way, you can easily revert the changes in case of an error.
Step 1: Create the network configuration file
In our example, our file is called 51-cloud-init.yaml:
sudo touch /etc/netplan/51-cloud-init.yaml
Step 2: Edit the configuration file
You can verify your network interface name with this command:
Next, open the network configuration file for editing with the following command:
sudo nano /etc/netplan/51-cloud-init.yaml
Edit the file with the content below, replacing INTERFACE_NAME and ADDITIONAL_IP with your own values:
network:
version: 2
ethernets:
INTERFACE_NAME:
dhcp4: true
addresses:
- ADDITIONAL_IP/32
If you have more Additional IPs to configure, the configuration file should look like this:
network:
version: 2
ethernets:
INTERFACE_NAME:
dhcp4: true
addresses:
- ADDITIONAL_IP1/32
- ADDITIONAL_IP2/32
Warning
It is important to respect the alignment of each element in this file as represented in the example above. Do not use the tab key to create your spacing.
Configuration example:
network:
version: 2
ethernets:
eth0:
dhcp4: true
addresses:
- 203.0.113.0/32
Save and close the file.
Step 3: Apply the new network configuration
You can test your configuration using this command:
If it is correct, apply it using the following command:
AlmaLinux (8/9), Rocky Linux (8/9)
The main configuration file is located in /etc/sysconfig/network-scripts/. In this example it is called ifcfg-eth0. Before making changes, verify the actual file name in this folder.
For each Additional IP to be configured, we create a separate configuration file with the following parameters: ifcfg-NETWORK_INTERFACE:ID. Where NETWORK_INTERFACE is the physical interface and ID is the virtual network interface or ethernet alias starting with a value of 0. For example, for our interface named eth0 the first alias is eth0:0, the second alias is eth0:1, etc...
Step 1: Determine the interface
Step 2: Create the configuration file
First, create the configuration file. Replace NETWORK_INTERFACE:ID with your own values.
sudo nano /etc/sysconfig/network-scripts/ifcfg-NETWORK_INTERFACE:ID
Next, edit the file with the content below, replacing NETWORK_INTERFACE:ID, and ADDITIONAL_IP with your own values:
DEVICE=NETWORK_INTERFACE:ID
ONBOOT=yes
BOOTPROTO=none # For CentOS use "static"
IPADDR=ADDITIONAL_IP
NETMASK=255.255.255.255
BROADCAST=ADDITIONAL_IP
Configuration example:
DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=none # For CentOS use "static"
IPADDR=203.0.113.0
NETMASK=255.255.255.255
BROADCAST=203.0.113.0
Step 3: Restart the interface
sudo systemctl restart NetworkManager
CentOS
sudo systemctl restart network
Fedora 42, AlmaLinux & Rocky Linux (10)
Fedora now uses keyfiles. NetworkManager previously stored network profiles in ifcfg format in this directory: /etc/sysconfig/network-scripts/. However, the ifcfg format is now deprecated. By default, NetworkManager no longer creates new profiles in this format. The configuration file is now found in /etc/NetworkManager/system-connections/.
Step 1: Create a backup
In our example, our file is called cloud-init-eno1.nmconnection, so we make a copy of the cloud-init-eno1.nmconnection file using the following command:
sudo cp -r /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection.bak
In case of a mistake, you will be able to revert the changes, using the commands below:
sudo rm -f /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection
sudo cp /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection.bak /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection
Step 2: Edit the config file
Info
Please note that the name of the network file in our example may differ from yours. Please adapt the commands to your file name.
sudo nano /etc/NetworkManager/system-connections/cloud-init-eno1.nmconnection
Do not modify the existing lines in the configuration file, add your Additional IP to the file as follows, replacing ADDITIONAL_IP/32 with your own values:
[ipv4]
method=auto
may-fail=false
address1=ADDITIONAL_IP/32
If you have two Additional IPs to configure, the configuration should look like this:
[ipv4]
method=auto
may-fail=false
address1=ADDITIONAL_IP1/32
address2=ADDITIONAL_IP2/32
Configuration example:
[ipv4]
method=auto
may-fail=false
address1=203.0.113.0/32
Step 3: Restart the interface
You now need to restart your interface:
sudo systemctl restart NetworkManager
cPanel
Step 1: Access the WHM IP management section
In the WHM control panel, click on IP Functions and select Add a New IP Address in the left-hand sidebar.
Step 2: Add the Additional IP information
Enter your Additional IP in the form xxx.xxx.xxx.xxx into the field “New IP or IP range to add”.
Select 255.255.255.255 as your subnet mask, then click on Submit.
Warning
Please note that if you have more than one IP to configure on the same block and you add them all at once, the WHM system will force you to use the subnet mask 255.255.255.0. We do not recommend using this configuration. Instead, you need to add each IP individually in order to use the proper subnet mask 255.255.255.255.
Step 3: Check the current IP configuration
Back in the section IP Functions, click on Show or Delete Current IP Addresses to verify that the Additional IP address was added correctly.
Plesk
Step 1: Access the Plesk IP management section
In the Plesk control panel, choose Tools & Settings from the left-hand sidebar.
Click on IP Addresses under Tools & Resources.
Step 2: Add the additional IP information
In this section, click on the button Add IP Address.
Enter your Additional IP in the form xxx.xxx.xxx.xxx/32 into the field "IP address and subnet mask", then click on OK.
Step 3: Check the current IP configuration
Back in the section "IP Addresses", verify that the Additional IP address was added correctly.
Windows Servers
Step 1: Verify the network configuration
Right-click on the Start Menu button and open Run.
Type cmd and click OK to open the command line application.
To retrieve the current IP configuration, enter ipconfig at the command prompt.
C:\Users\Administrator>ipconfig
Windows IP Configuration
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . : openstacklocal
Link-local IPv6 Address . . . . . : fe90::30gf:258a:84d6:abcf%5
IPv4 Address. . . . . . . . . . . : 192.0.2.29
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 192.0.2.1
Step 2: Change the IPv4 Properties
Now you need to change the IP properties to a static configuration.
- Go to
Start > Control Panel > Network and Internet > Network and Sharing Centre > Change Adapter Settings (in the left-hand menu).
- Right-click on
Ethernet.
- Click on
Properties.
- Select
Internet Protocol Version 4 (TCP/IPv4), then click on Properties.
- Click on
Use the following IP address and type in your server’s primary IP, subnet mask and default gateway information obtained by using the ipconfig command above. In the "Preferred DNS Server" box, type 213.186.33.99.
Warning
Be careful – the server will no longer be accessible if you enter incorrect information. You will then have to make the corrections in the KVM.
Once done, click on Advanced.
Step 3: Add the Additional IP in the "Advanced TCP/IP Settings"
In the new window, click on Add... under "IP addresses". Enter your Additional IP address and the subnet mask (255.255.255.255).
Confirm by clicking on Add.
Once done, click on OK to apply the configuration.
You will lose the connection to the server for a few seconds.
Step 4: Check the new network configuration
Open the command prompt (cmd) and enter ipconfig. The configuration should now include the new Additional IP address.
C:\Users\Administrator>ipconfig
Windows IP Configuration
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe90::30gf:258a:84d6:abcf%5
IPv4 Address. . . . . . . . . . . : 192.0.2.29
Subnet Mask . . . . . . . . . . . : 255.255.255.255
IPv4 Address. . . . . . . . . . . : 203.0.113.0
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 192.0.2.1
