Vitux published a tutorial about how to assign multiple IP addresses to a single network interface on CentOS 8.

How to Assign Multiple IP Addresses to a Single Network Interface on CentOS 8

At times, you might have to assign multiple IP addresses to a single Network Interface Card (NIC). The most common use-case of doing so can be that there is more than one network and you want to connect your machine.

How to Assign Multiple IP Addresses to a Single Network Interface on CentOS 8