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Adding a Public IPv4 Address to a Dedicated Server (CentOS 8)

For Dedicated Servers

This article explains how to add an additional public IPv4 address on a Dedicated Server where CentOS 8 is installed.

To configure an additional public IPv4 address in CentOS 8, 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.

  • To check the current network configuration of your server, enter the following command:
    [root@localhost ~]# nmcli connection show
    The network interface will now be displayed. Example:
    [root@localhost ~]# nmcli connection show
    NAME  UUID                                  TYPE      DEVICE
    eth0  5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03  ethernet  eth0

  • To customize the network configuration of your server and use an additional public IPv4 address, enter the following command:
    [root@localhost ~]# nmcli con mod NETWORK INTERFACE +ipv4.addresses "Additional IPv4 ADDRESS"
    Example:
    [root@localhost ~]# nmcli con mod eth0 +ipv4.addresses "123.456.789.12"
    The additional public IPv4 address has now been added.

  • Restart your server. To do this, enter the following command:
    [root@localhost ~]# reboot
    The SSH connection will be interrupted after the command is entered.

  • Log on to the server again.

  • 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@3BB37B1 ~]# 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:9a:76:52 brd ff:ff:ff:ff:ff:ff
        inet 82.165.190.99/32 scope global noprefixroute eth0
           valid_lft forever preferred_lft forever
        inet 217.160.213.17/32 scope global dynamic noprefixroute eth0
           valid_lft 42916sec preferred_lft 42916sec
        inet6 2001:8d8:1800:419::1/128 scope global dynamic noprefixroute
           valid_lft 3317sec preferred_lft 3317sec
        inet6 fe80::ae1f:6bff:fe9a:7652/64 scope link noprefixroute
           valid_lft forever preferred_lft forever
    3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
        link/ether ac:1f:6b:9a:76:53 brd ff:ff:ff:ff:ff:ff