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Adding Public IPv4 and IPv6 Addresses on a Dedicated Server (Ubuntu 20.04/22.04 or Debian 11/12)

This article explains how to add additional public IPv4 and IPv6 addresses on a Dedicated Server running Ubuntu 20.04, 22.04, Debian 11 and 12.

Attention

These instructions are valid only for the Dedicated Server. How to add IPv4 addresses and IPv6 addresses on a Cloud Server is described in the following article:

Adding Public IPv4 and IPv6 Addresses on a Cloud Server or vServer (Ubuntu 18.04, Ubuntu 20.04, Debian 10, 11 and Debian 12)

Configuring Public IPv4 and IPv6 Addresses on a Cloud Server or vServer with netplan (Ubuntu 22.04)

How to configure an additional public IPv4 address in Ubuntu 20.04, 22.04, Debian 11 and 12:

Requirements

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

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

  • Determine the file name of the network interface. To do this, enter the following command:

    [root@localhost ~]# ip addr

  • Make a note of the network interface name.

  • Open the /etc/network/interfaces file with the vi editor.

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

Note

The vi editor has an insert mode and a command mode. You can enter the insert mode by pressing the [i] key. In this mode, the entered characters are immediately inserted into the text. To enter the command mode, press [ESC] afterwards. When you use the command mode, your keyboard inputs are interpreted as a command.

  • Replace the existing entries with the information below:

    source /etc/network/interfaces.d/*

    # The loopback network interface
    auto lo 
    iface lo inet loopback

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

    auto NETWORKINTERFACE:0
    allow-hotplug NETWORKINTERFACE:0
    iface NETWORKINTERFACE:0 inet static
     address ADDITIONAL-IPv4-ADDRESS/32

    iface NETWORKINTERFACE inet6 manual
    iface NETWORKINTERFACE inet6 static
        address MAIN-IPv6-ADDRESS
        netmask 64

    iface NETWORKINTERFACE inet6 static
        address ADDITIONAL-IPv6-ADDRESS
        netmask 64

    Example:

    source /etc/network/interfaces.d/*

    # The loopback network interface
    auto lo
    iface lo inet loopback

    allow-hotplug eth0
    iface eth0 inet static
     address 85.215.105.86/32
    netmask 255.255.255.255
    gateway 10.255.255.1

    auto eth0:0
    allow-hotplug eth0:0
    iface eth0:0 inet static
     address 85.215.109.181/32

    iface eth0 inet6 manual
    iface eth0 inet6 static
        address 2a01:239:0:805d::1
        netmask 64

    iface eth0 inet6 static
        address 2a01:239:0:805d::2
        netmask 64

  • Replace the wildcards and, if necessary, the network interface if it differs.

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

  • To reboot the server, type the following command:

    [root@localhost ~]# systemctl reboot

  • To verify that the additional IPv4 and IPv6 addresses have been added, type the following command:

    [root@localhost ~]# ip addr

    The additional public IPv4 and IPv6 addresses are then displayed. Example:

    root@FC01C67:~# 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 3c:ec:ef:91:f6:04 brd ff:ff:ff:ff:ff:ff
        altname eno1np0
        altname enp198s0f0np0
        inet 85.215.105.86/32 brd 85.215.105.86 scope global eth0
           valid_lft forever preferred_lft forever
        inet 85.215.109.181/32 brd 85.215.109.181 scope global eth0:0
           valid_lft forever preferred_lft forever
        inet6 2a01:239:0:805d::3/64 scope global
           valid_lft forever preferred_lft forever
        inet6 2a01:239:0:805d::2/64 scope global
           valid_lft forever preferred_lft forever
        inet6 2a01:239:0:805d::1/64 scope global
           valid_lft forever preferred_lft forever
        inet6 fe80::3eec:efff:fe91:f604/64 scope link
           valid_lft forever preferred_lft forever
    3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
        link/ether 3c:ec:ef:91:f6:05 brd ff:ff:ff:ff:ff:ff
        altname eno2np1
        altname enp198s0f1np1