Welcome to the forum @JereLehtonen
This isn't a node-red issue at all, but if you look at this blog at the section " Optional - Set a fixed IP address" it shows you the options for setting a fixed IP. I know the blog is about setting up a headless server, but that doesn't matter, the section on setting the IP is ok for headless or GUI installations.
Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
The OpenJS Foundation | Terms of Use | Privacy Policy | OpenJS Foundation Bylaws | Trademark Policy | Trademark List | Cookie Policy