T-Mobile Home Internet - Setup Fixed IP

EdgarOnWheels wrote:

How can I set FIXED IP's? I need fixed IP for my printer and cloud device, because with DHCP, every time I restart devices, with random IP, I lose mappings and have to refresh settings all the time.

This is why you typically give devices a name and you point to the name instead of the IP address. The DHCP lease may be too short, so if any of the devices are disconnected past the time to live (TTL) time, then they will receive a new IP address. If you create a network port using the printer name, then the IP won't matter as the DNS will find the IP with the printer name.

The alternative is a feature called DHCP Reservation on most routers. Not sure if the T-Mobile device can do this. If it doesn't, you can find a cheap home router on eBay that has this feature.  Reservation will assign an IP address you reserve tied to the MAC address of the device. So, whenever your devices talk to the DHCP server, it will always get the IP address you've reserved. This is like giving the device a static IP, but it is managed on the router level not device level.