I’m not quite clear on what and how you tried to do this, but as I read it I have the following tips & comments:
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Only MineOS (with it’s underlying OS) has an IP adress, and usually only one pr network card (more specifically: one IPv4 address and one IPv6 address (if IPv& is activated) pr NiC). You do not set a separate IP for your minecraft servers. The reccomended way for Minecraft servers is to not enter any IP-address, but leave it as is (0.0.0.0). This means that your Minecraft server will listen for connection on all available interfaces, but only on the port you specified.
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You separate several minecraft servers by giving them unique ports, so you server #1 would get 25565, #2 could then have 25566 (but not 25565, since it is taken), and so on. This means you in the minecraft client have to specify: [server address]:[port number] for any server not running default servers. If you have accsess to a domain and a domain server, you can set up an SRV-record to create a path from an url to an ipadress:port pair.
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You did not specify so: To connect to your LAN-IP-Address server, you need to use your Internet IP-Address. You can find that address with a service like https://www.whatismyip.com/. Port forwarding do not put you r LAN address on the internet, but sets up a path from an internett address to a LAN address by telling your internet router where to pass on requests.