Activate an Additional Private IPv4 Address

After assigning additional private IPv4 address to your elastic compute instance, you need to access the instance and configure the private IPv4 to make it effective.

Note

• The configuration process may vary slightly depending on the operating system and its version. Please configure accordingly based on your specific circumstances. The following steps are for reference only.

• All the examples use the network interface eth0 as an example. Replace the name with your actual connection name.

Configure Private IPv4 on Linux Instance

RHEL Series Operating Systems

Applicable operating systems: CentOS, AlmaLinux, etc.

1. Check current network information:

   • View current network details on the cloud server and use route -n to check the default gateway.

     route -n

2. Modify network configuration file:

   • If configuring a single private IPv4 address, edit the following file:

     sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0:0

   • Sample configuration file content:

     DEVICE=eth0:0
     BOOTPROTO=static
     HWADDR=00:0C:29:6F:62:A7
     ONBOOT=yes
     IPADDR=172.16.2.6       # Additional private IPv4
     NETMASK=255.255.255.0   # Subnet mask
     GATEWAY=172.16.2.1      # Gateway

3. Activate network interface or restart network service:

   • Activate the network interface:

     sudo ifup eth0:0

   • Or restart the network service:

     sudo systemctl restart network

4. Verify configuration:

   • Check the configuration using ifconfig or ip addr show.

     ifconfig

Rocky Operating System

For Rocky, you can use the nmcli command-line tool provided by NetworkManager to configure additional private IPv4 addresses.

1. Disable cloud-init network configuration:

   • Cloud-init may override network settings on instance restart. To prevent configuration failures, create a file to disable cloud-init network configuration:

     sudo vim /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg

   • Add the following configuration to the file:

     network: {config: disabled}

2. Check current network connections:

   • Run the following command:

     nmcli con show

   • The network connection name varies across different distributions. A sample is shown below:

     
3. Configure additional private IPv4 addresses and gateway:

   • Run the following commands to configure the additional private IPv4 addresses, default gateway, and subnet mask of eth0:

     sudo nmcli con modify "System eth0" ipv4.addresses 172.16.2.1/24,172.16.2.3/24,172.16.2.5/24   # Additional private IPv4
     sudo nmcli con modify "System eth0" ipv4.gateway 172.16.2.1      # Gateway

4. Activate the network configuration:

   • Apply the changes by running:

     sudo nmcli con up "System eth0"

     If a message similar to "Connection successfully activated" is returned, the configurations take effect.

5. Verify configuration:

   • Check the configuration using ifconfig or ip addr show.

     ifconfig

Debian Series Operating Systems

Applicable operating systems: Ubuntu, Debian.

1. Check current network information:

   • View current network details on the cloud server and use route -n to check the default gateway.

     route -n

2. Modify network configuration file:

   • Edit the network configuration file:

     sudo vi /etc/network/interfaces

   • Sample configuration file content:

     auto eth0:0
     iface eth0:0 inet static
     address 172.16.2.2      # Additional private IPv4
     netmask 255.255.255.0   # Subnet mask
     gateway 172.16.2.1      # Gateway

3. Restart network service:

   • Restart the network service:

     sudo systemctl restart networking

4. Verify configuration:

   • Check the configuration with ifconfig or ip addr show.

     ifconfig

SLES Series Operating Systems

Applicable operating systems: OpenSUSE.

1. Modify network configuration file:

   • Edit the network configuration file:

     sudo vi /etc/sysconfig/network/ifcfg-eth0

   • Sample configuration file content:

     IPADDR_0=172.16.2.8     # Additional private IPv4
     NETMASK_0=255.255.255.0 # Subnet mask

2. Restart network service:

   • Restart the network service:

     sudo systemctl restart network

3. Verify configuration:

   • Check the configuration with ifconfig or ip addr show.

     ifconfig

Configure Private IPv4 on Windows Instance

1. View network information:

   • Open Windows PowerShell and run the following command to view IP address, subnet mask and default gateway information:

     ipconfig /all

2. Open Network and Sharing Center:

   • Go to Control Panel > Network and Internet > Network and Sharing Center, and click on the Ethernet adapter to edit.

3. Edit Ethernet properties:

   • In the Ethernet Status dialog, click on Properties.

4. Configure IPv4 settings:

   • Select Internet Protocol Version 4 (TCP/IPv4) and click on Properties.

5. Fill in network information:

   • Fill in the following fields with the values obtained in step 1:

     • IP address

     • Subnet mask

     • Default gateway

     • Preferred DNS server

     • Alternate DNS server (if applicable)

6. Configure additional private IPv4:

   • Click on Advanced and add the additional private IPv4.

   • In the Advanced TCP/IP Settings dialog, click on Add under the IP addresses section.

   • Fill in the additional private IPv4 and subnet mask, then click Add.

7. Save and verify configuration:

   • Click OK to save the settings in all dialogs.

   • In the Ethernet Status dialog, click Details to view the configured IP information.

8. Test connectivity:

   • Test the connectivity of the additional private IPv4 from other instances within the same global VPC using ping.