Linux Hint published a tutorial about how to assign multiple IP addresses to single NIC in Ubuntu 20.04 LTS.

How to Assign Multiple IP Addresses to Single NIC in Ubuntu 20.04 LTS

While working with computer systems, sometimes you might require multiple IP addresses on your physical machine. One of the solutions is to have multiple NICs installed on your system. However, it is not practical to buy a new NIC and plug it in your system when you have the option to assign multiple IP addresses to a single NIC which is referred to as IP Aliasing. The common use case of IP aliasing is the implementation of IP based virtual hosting.

How to Assign Multiple IP Addresses to Single NIC in Ubuntu 20.04 LTS – Linux Hint