Add a Secondary IP Address in Linux!

It's easy to add an IP address temporarily, or permanently in Linux. The process has changed in recent years, but we cover a few ways to accomplish the task in this solution clip from our livestream. Here's the original assignment:

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[AlianeAbdelouahab]

Thank you for the video,
for the record, netplan uses systemd-netword in headeless system (you can for example check with systemctl status systemd-networkd)

[DV-mlfm]

That was awesome. I was thinking of getting a usb network card to have an additional ip. With this tutorial, I don't need to. Thanks

[DomAtWork]

Sadly it doesn't show if it works the same way if your primary ip adress is static and how nmcli would alter the config file in this case.

[DarkFL]

If you minus(ed) the original IP address, would the new IP replace the old one? Or would you have to somehow change the original IP in dhcp? I apologize, I'm a bit new to this. Also, all cards on the table: I'm trying to change an IP address on another machine to a new IP address because there was a data leak. For security reasons, I need to make sure that the old IP and the new IP don't match.

[smeister]

nmtui for the win, works from the cli and easier to walk someone through from over the phone.

[PlanetoftheGaming]

I'm not sure i understand how this works, don't i get my ip address from a DHCP server?

[HussainNagriMe]

wont you have to add a route for the secondary IP?