

This only guarantees your WANip:8100 will map to 192.168.0.113:81, and doesn’t address whether or not dns resolution is correct. I would also be weary of using port numbers on wikipedia’s known ports list, as some ISPs will filter those upstream. The last thing is that your router may not want to hairpin that traffic, so if you’re not coming in from the outside it might not be a valid test.
Most people don’t have a RAID to fall back on either, and I would argue most cars’ donuts or spares haven’t been checked since the car was new so I think it holds up better than you’re giving it credit for lol