How to Add Additional IP Address in Ubuntu 22?

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Step 1: Find the Network Interface Name

Open the terminal and run the following command to see the existing network interfaces:

ip a

When you run this command, you'll get an output similar to the following:

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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:00:4c:53 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.5/24 brd 192.168.1.255 scope global dynamic noprefixroute enp0s3
       valid_lft 86386sec preferred_lft 86386sec
    inet6 fe80::a00:27ff:fe00:4c53/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

In this output, the network interface name is enp0s3 and the current IP address is 192.168.1.5/24. Your system's network interface name might be different, such as eth0 or ens192.

Step 2: Create and Edit the Netplan Configuration File

First, create or edit a netplan configuration file. For example, create or edit the 01-netcfg.yaml file:

sudo nano /etc/netplan/01-netcfg.yaml

Paste the following content into the file and adjust it according to your network interface name and IP addresses. In this example, we assume the network interface name is enp0s3:

network:

version: 2

renderer: networkd

ethernets:

enp0s3:

dhcp4: true

addresses: [192.168.1.10/24, 10.0.0.10/24]