Adding a Public IPv4 Address to a Dedicated Server (Debian 10)

For Dedicated Server

This article explains how to add an additional public IPv4 address on a Dedicated Server where Debian 10 is installed.

To configure an additional public IPv4 address in Debian 10, 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 information with the following:
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 ADDRESS/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 your 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