I could do that, although if I was going to try and convince the owner to change the configuration I should probably ask for a unique address (or block of addresses).

Things mostly work at the moment. But if my needs change there is no guarantee that my landlord’s NAT will support whatever new protocols I want to use. I’m not sure that I want to try and convince my landlord to buy a new NAT box when I want to start doing something his current NAT box breaks.

Unique addressing avoids a potentially Sisyphean escalation between new protocols and the NATs that need to support them.

Leo

Hence you will avoid double NAT, as you can satisfy all your IP address needs with the single NAT from your apartment owner.