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Add public IPv4 and IPv6 addresses to a Dedicated Server (Rocky Linux 9 and AlmaLinux 9)

For Dedicated Servers which are managed in the Cloud Panel

This article explains how to add additional public IPv4 and IPv6 addresses to a Dedicated Server with Rocky Linux 9 or AlmaLinux 9 installed.

Note

Instructions on how to establish an encrypted connection to your server 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 and IPv6 addresses in Rocky Linux 9 or AlmaLinux 9:

Requirements
  • You have assigned one or more additional public IPv4 and/or IPv6 addresses to your server in the Cloud Panel.
  • You have logged in to the server.
  • You have noted the IPv4 addresses and IPv6 addresses of the server.

Create a backup copy of the existing profile

  • Log in to the server as an administrator.

  • Open the directory /etc/NetworkManager/system-connections by entering the following command:

    [root@localhost ~]# cd /etc/NetworkManager/system-connections

  • To display the files located in the directory, enter the following command:

    [root@localhost ~]# ls

  • To create a backup copy of the network profile, adapt the following command. Replace the placeholders and then enter the command:

    sudo cp /etc/NetworkManager/system-connections/CONNECTION_NAME.nmconnection /etc/NetworkManager/system-connections/CONNECTION_NAME.backup


    Example:

    sudo cp /etc/NetworkManager/system-connections/eth0.nmconnection /etc/NetworkManager/system-connections/eth0.nmconnection.backup

Display 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@5B9B34D ~]# 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:88:fe:ee brd ff:ff:ff:ff:ff:ff:ff
altname eno1np0
altname enp198s0f0np0
inet 82.165.19.97/32 scope global dynamic noprefixroute eth0
valid_lft 13527sec preferred_lft 13527sec
inet6 fe80::3eec:efff:fe88:feee/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 3c:ec:ef:88:fe:ef brd ff:ff:ff:ff:ff:ff:ff
altname eno2np1
altname enp198s0f1np1

Determine connection name

  • To display detailed information on the network interface, enter the following command:

    nmcli device show NETWORK_INTERFACE_NAME

    Example:
     

    nmcli device show eth0

  • Make a note of the connection name. This is listed in the GENERAL.CONNECTION: entry.
  • To exit the display, press the q button.

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@5B9B34D ~]# cat /etc/resolv.conf # Generated by NetworkManager
    search online-server.cloud
    nameserver 212.227.123.16
    nameserver 212.227.123.17

  • Make a note of the DNS servers.

Display gateway for IPv4 and IPv6

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

IPv4:

[root@localhost ~]# ip route show | grep 'default'


IPv6:

[root@localhost ~]# ip -6 route show | grep 'default'


or

[root@localhost ~]# ip -6 route show default

Add IPv4 and IPv6 addresses

  • To specify the main IPv4 address, replace the placeholders in the following command. Then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv4.addresses PRIMARY_IPV4_ADDRESS/32

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv4.addresses 217.160.11.143/32

  • To specify the main IPv6 address, replace the placeholders in the following command and then enter it:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv6.addresses PRIMARY_IPV6_ADDRESS/64

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv6.addresses 2001:8d8:1801:83bd::1/64

  • To specify the IPv4 gateway, replace the placeholder IPv4-GATEWAY_ADDRESS in the following command with the IPv4 gateway that you have determined. In addition, replace the placeholder CONNECTION_NAME and then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv4.gateway IPv4-GATEWAY_ADDRESS

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv4.gateway 10.255.255.1

  • To specify the IPv6 gateway, replace the placeholder IPv6-GATEWAY_ADDRESS in the following command with the IPv6 gateway that you have determined. In addition, replace the placeholder CONNECTION_NAME and then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv6.gateway IPv6-GATEWAY_ADDRESS

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv6.gateway fe80::250:56ff:fea8:4cef

  • To specify the DNS servers, replace the DNS_SERVER placeholder in the following command with the DNS servers determined. Separate them with a space and add inverted commas at the beginning and end. In addition, replace the placeholder CONNECTION_NAME and then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv4.dns DNS_SERVER

    Examples:

    [root@localhost ~]# nmcli connection modify "eth0" ipv4.dns 212.227.123.16

    [root@localhost ~]# nmcli connection modify "eth0" ipv4.dns "212.227.123.16 212.227.123.17"

  • To change the assignment of IPv4 addresses from automatic (DHCP) to manual, replace the placeholder CONNECTION_NAME in the following command. Then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv4.method manual

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv4.method manual

  • To change the assignment of IPv6 addresses from automatic (DHCP) to manual, replace the placeholder CONNECTION_NAME in the following command. Then enter the command:

    [root@localhost ~]# nmcli connection modify "CONNECTION_NAME" ipv6.method manual

    Example:

    [root@localhost ~]# nmcli connection modify "eth0" ipv6.method manual

  • To add the additional IPv4 address to the network configuration, replace the placeholders CONNECTION_NAME and ADDITIONAL_IPV4_ADDRESS in the following command. Then enter the command:

    [root@localhost ~]# nmcli con mod "CONNECTION_NAME" +ipv4.addresses "ADDITIONAL_IPV4_ADDRESS/32"

    Example

    [root@localhost ~]# nmcli con mod "eth0" +ipv4.addresses "82.165.236.99/32"

  • To add the additional IPv6 address to the network configuration, replace the placeholders CONNECTION_NAME and ADDITIONAL_IPV6_ADDRESS in the following command. Then enter the command:

    [root@localhost ~]# nmcli con mod "CONNECTION_NAME" +ipv6.addresses "ADDITIONAL_IPV6_ADDRESS/64"

    Example:

    [root@localhost ~]# nmcli con mod "eth0" +ipv6.addresses "2001:8d8:1801:83bd::2/64"

  • To restart the network interface, customise the following command and enter it:

    [root@localhost ~]# nmcli connection down "CONNECTION_NAME"; nmcli connection up "CONNECTION_NAME"

    Example:

    [root@localhost ~]# nmcli connection down "eth0"; nmcli connection up "eth0"

  • To check the new settings, enter the following command:

    [root@localhost ~]# ip address show

Note

If the server is no longer accessible due to a configuration error, you can log in to the server using the Rescue System and correct the configuration.

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