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    Home Server & Cloud Infrastructure Dedicated Server Dedicated Server: Adding a Public IPv4 Address

    Adding a Public IPv4 Address to a Dedicated Server (Ubuntu 20.04)

    For Dedicated Servers

    This article explains how to add an additional public IPv4 address on a Dedicated Server where Ubuntu 20.04 is installed.

    Warning

    These instructions are only valid for dedicated servers. You can learn how to add IPv4 and IPv6 addresses on a cloud server in the following article:

    Adding public IPv4 and IPv6 addresses on a Linux server (Ubuntu and Debian)

    To configure an additional public IPv4 address in Ubuntu 20.04, please proceed as follows:

    Requirements

    • In the Cloud Panel, you have assigned an additional public IPv4 address to your server.

    • You have logged on to the server as an administrator.

    • Check which network interface is in use and enter the following command:

      [root@localhost ~]# ip addr

    • Open the /etc/network/interfaces file in the vi Editor.  

      [root@localhost ~]# vi /etc/network/interfaces

    Notes

    • The vi Editor has a command mode and an insert mode. To switch to input mode, press [i] on your keyboard. You can now insert the required content or make the required changes. Press the [ESC] key on your keyboard to exit the input mode.

    • To exit vi and save the file, type the command :wq, then press Enter.

    • Replace the entries with the following information:

      auto lo eth0
      iface lo inet loopback

      allow-hotplug eth0
      iface eth0 inet static
       address MAIN IPv4 ADDRESS/32
      netmask 255.255.255.255
      gateway 10.255.255.1

      auto eth0:0
      allow-hotplug eth0:0
      iface eth0:0 inet static
       address ADDITIONAL IPv4 ADRESS/32

      iface eth0 inet6 manual
            up dhclient -6 -nw -v eth0
      eth0
            down dhclient -6 -r -v eth0

    Example:

    auto lo eth0
    iface lo inet loopback

    allow-hotplug eth0
    iface eth0 inet static
     address 217.160.244.147/32
    netmask 255.255.255.255
    gateway 10.255.255.1

    auto eth0:0
    allow-hotplug eth0:0
    iface eth0:0 inet static
     address 82.165.248.54/32

    iface eth0 inet6 manual
          up dhclient -6 -nw -v eth0
    eth0
          down dhclient -6 -r -v eth0

    • Save the file.

    • Restart the server.

    • To check if the additional public IPv4 address has been added, type the following command:

      [root@localhost ~]# ip addr

      The additional public IPv4 address will now be displayed. Example:

      root@A34C022:~# ip addr
      1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
          link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
          inet 127.0.0.1/8 scope host lo
             valid_lft forever preferred_lft forever
          inet6 ::1/128 scope host
             valid_lft forever preferred_lft forever
      2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
          link/ether ac:1f:6b:9b:22:44 brd ff:ff:ff:ff:ff:ff
          inet 217.160.244.147/32 scope global dynamic eth0
             valid_lft 42230sec preferred_lft 42230sec
          inet 82.165.248.54/32 brd 82.165.248.255 scope global eth0:0
             valid_lft forever preferred_lft forever
          inet6 2001:8d8:1800:1a1::1/128 scope global
             valid_lft forever preferred_lft forever
          inet6 fe80::ae1f:6bff:fe9b:2244/64 scope link
             valid_lft forever preferred_lft forever
      3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
          link/ether ac:1f:6b:9b:22:45 brd ff:ff:ff:ff:ff:ff