Adding public IPv4 and IPv6 addresses to a VPS, VPS+, or a migrated Cloud Server (Debian 12 and 13)

This step is only required for Debian 12.

• Change to the /etc/netplan directory.

  [root@localhost ~]# cd /etc/netplan

• Check whether there is already a configuration file in this directory. To do this, enter the following command:

  [root@localhost ~]# ls

• To view the DNS servers being used, enter the following command:

  [root@localhost ~]# resolvectl --no-pager | grep Server

  The DNS servers in use will then be displayed at the end of the output. Example:

  [root@localhost ~]# resolvectl --no-pager | grep Server
  Current DNS Server: 212.227.123.16
       DNS Servers: 212.227.123.16 212.227.123.17

• Make a note of the DNS servers.

• Change to the /etc/netplan directory and identify the name of the configuration file.

  [root@localhost ~]# cd /etc/netplan
  [root@localhost ~]# ls /etc/netplan

• If the file 00-Public_network.yaml is present in this directory, do not rename it, as this file is required for the public network. If there is a configuration file with a different filename in this directory, rename it. To do this, enter the following command and replace the placeholders.

  [root@localhost ~]# mv OLD_CONFIGURATION_FILE.yaml OLD_CONFIGURATION_FILE.yaml.old

  Example:

  [root@localhost ~]# mv 50-cloud-init.yaml 50-cloud-init.yaml.old

• Create the file /etc/netplan/01-netcfg.yaml using the vi editor. To do this, enter the following command:

  [root@localhost ~]# vi /etc/netplan/01-netcfg.yaml

• Insert the following information:

  network:
   version: 2
   renderer: networkd
   ethernets:
     NETWORK_INTERFACE:
       addresses:
         - PRIMARY_IPV4_ADDRESS/32
         - ADDITIONAL_IPV4_ADDRESS/32
         - PRIMARY_IPV6_ADDRESS/64
         - ADDITIONAL_IPV6_ADDRESS_1/64
       nameservers:
         addresses:
           - IP_ADDRESS_OF_NAMESERVER_1
           - IP_ADDRESS_OF_NAMESERVER_2
       routes:
         - on-link: true
           to: default
           via: DEFAULT_GATEWAY_OF_THE_ACTIVE_INTERFACE

  Example:

  network:
   version: 2
   renderer: networkd
   ethernets:
     ens6:
       addresses:
         - 195.20.234.94/32
         - 195.20.234.86/32
         - 2a02:247a:21f:9c00::1/64
         - 2a02:247a:21f:9c00::2/64
       nameservers:
         addresses:
           - 212.227.123.16
           - 212.227.123.17
       routes:
         - on-link: true
           to: default
           via: 195.20.234.1

• Replace the placeholder NETWORK_INTERFACE with the network interface you have identified. In this example, this is the network interface ens6.
• Next, enter the primary IPv4 address and the secondary IPv4 address. To do this, replace the placeholders.
• Enter the primary IPv6 address and the secondary IPv6 address. Replace the placeholders accordingly.
• Replace the IP_ADDRESS_OF_NAMESERVER_1 and IP_ADDRESS_OF_NAMESERVER_2 placeholders with the DNS servers you identified.
• Replace the DEFAULT_GATEWAY_OF_THE_ACTIVE_INTERFACE placeholder with the IPv4 gateway you identified.
• To exit vi and save the file, enter the command :wq and then press the Enter key.

• To change the permissions of the new configuration file so that it can only be read and modified by the root account, adapt the following command and then enter it:

  [root@localhost ~]# sudo chmod 600 /etc/netplan/CONFIGURATION_FILE.yaml

  Example:

  [root@localhost ~]# sudo chmod 600 /etc/netplan/01-netcfg.yaml

• To check the configuration file, enter the following command:

  [root@localhost ~]# netplan --debug apply

• Restart the server so that the changes take effect. To do this, enter the following command:

  [root@localhost ~]# systemctl reboot

• To check whether the additional IPv4 address has been configured correctly, enter the following command:

  [root@localhost ~]# ip addr