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Adding a public IPv4 addresses to a VPS or a migrated Cloud Server (Rocky Linux 8 and AlmaLinux 8)

For Linux VPS and migrated Cloud Servers with AlmaLinux 8 or Rocky Linux 8, which are managed in the Cloud Panel

This article explains how to add additional public IPv4 addresses to a VPS or a migrated Cloud Server with AlmaLinux 8 or RockyLinux 8 installed.

Note

Instructions on how to establish an encrypted connection to your server with your computer are listed in the following articles:

Establishing an SSH connection to your Linux server on a computer with Microsoft Windows

Establishing an SSH connection to your Linux server on a Linux computer

How to configure additional, public IPv4 addresses in Rocky Linux 8 and AlmaLinux 8:

Requirements
  • You have assigned one or more additional public IPv4 addresses to your server in the Cloud Panel.
  • You have logged in to the server as an administrator.
  • You have noted the IPv4 addresses of the server.

Determine network interface

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

    [root@localhost ~]# ip addr

  • In the following example, the network interface eth0 is used:

    [root@localhost ~]# 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 fq_codel state UP group default qlen 1000
    link/ether 02:01:ef:af:de:4f brd ff:ff:ff:ff:ff:ff:ff
    altname enp0s6
    altname ens6
    inet 82.165.34.29/32 scope global dynamic noprefixroute eth0
    valid_lft 582sec preferred_lft 582sec
    inet6 2a02:247a:21f:9c00::1/128 scope global dynamic noprefixroute
    valid_lft 3685sec preferred_lft 2685sec
    inet6 fe80::1:efff:feaf:de4f/64 scope link noprefixroute
    valid_lft forever preferred_lft forever

Show DNS server

  • To display the DNS servers used, enter the following command:

    [root@localhost ~]# cat /etc/resolv.conf

  • The DNS servers used are then displayed in the nameserver entry. Example:

    [root@localhost ~]# cat /etc/resolv.conf
    # Generated by NetworkManager
    nameserver 212.227.123.16
    nameserver 212.227.123.17

  • Make a note of the DNS servers.

Show gateway for IPv4

To display the default gateway of the active interface, enter the following command:

IPv4:

[root@localhost ~]# ip route show default

This command displays the routing table. The default gateway is listed in the line beginning with default. Example:

[root@localhost ~]# default via 82.165.34.1 dev eth0 proto dhcp src 82.165.34.32 metric 100

Add IPv4 addresses

  • Open the file /etc/sysconfig/network-scripts/ifcfg-eth0 with the vi editor.

    [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0

Notes
  • The vi editor has an insert mode and a command mode. You can call up insert mode with the [i] key. In this mode, the characters entered are immediately inserted into the text. To call up command mode, press [ESC]. If you use command mode, your keyboard input is interpreted as a command.
  • To exit vi and save the file, enter the command :wq and then press Enter.

  • Replace the existing entries with the following information:

    NAME=Public_NETWORK_INTERFACE_NAME
    TYPE=Ethernet
    DEVICE=NETWORK_INTERFACE_NAME
    ONBOOT=yes
    BOOTPROTO=none
    BOOTPROTOv6="dhcp"
    IPADDR=MAIN_IPV4_ADDRESS
    PREFIX=32
    GATEWAY=IPV4-GATEWAY
    DNS1=DNS-SERVER 1
    DNS2=DNS-SERVER 2
    IPV6INIT=yes
    IPV6_FAILURE_FATAL=no
    IPV6_AUTOCONF=yes
    DHCPV6C=yes

  • Replace the placeholder NETWORK_INTERFACE_NAME in all places with the name of the network interface you have determined.
  • Replace the placeholder in the IPADDR line with the main IPv4 address.
  • For DNS1 and DNS2, enter the DNS servers that you have noted.

  • To configure the additional IPv4 address(es), add the following entry(s):

    IPADDR1=ADDITIONAL_IPV4_ADDRESS
    PREFIX1=32
    IPADDR2=ADDITIONAL_IPV4_ADDRESS
    PREFIX2=32
    IPADDRN=ADDITIONAL_IPV4_ADDRESS
    PREFIXN=32

    Replace the ADDITIONAL_IPV4_ADDRESS part with the desired additional IPv4 address.

    The following example shows a complete entry that is used to configure the main IPv4 address and an additional IPv4 address.

    NAME=Public_eth0
    TYPE=Ethernet
    DEVICE=eth0
    ONBOOT=yes
    BOOTPROTO=none
    BOOTPROTOv6="dhcp"
    IPADDR=82.165.34.29
    PREFIX=32
    IPADDR1=85.215.75.125
    PREFIX1=32
    GATEWAY=82.165.34.1
    DNS1=212.227.123.16
    DNS2=212.227.123.17
    IPV6INIT=yes
    IPV6_FAILURE_FATAL=no
    IPV6_AUTOCONF=yes
    DHCPV6C=yes

  • To exit vi and save the file, enter the following command and then press Enter:

    :wq

  • To restart the server, enter the following command:

    [root@localhost ~]# systemctl reboot

  • Log in to the server again.

  • To check whether the desired IPv4 addresses have been configured correctly, enter the command ip addr show:

    [root@localhost ~]# ip addr show

Note

If the server is no longer accessible due to a configuration error, you can log in to the server via the remote console and correct the configuration.

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