Interesting setup. I would personally attach the NAS to one of the ASUS router 10 G ports, the 10 G switch to the other router 10 G port, and connect the computers to the switch. Did you do it this way to test the MTU capabilities of the AXE16000?
Some people have noted the 10 G ports on the router are not capable of 10 G speed, so I find comfort that you were able to see this throughput. I personally would not be concerned about MTU unless it was slow/not 10 G speed...
How about with the computers both connected to the switch and MTU set to 9000 on both, are they able to connect to the internet/www?
I did a little reading on MTU/jumbo packets and the limitation may be set by your ISP. Ã‚*Since the router is forwarding packets from the ISP if the ISP sets MTU to 1500 that will be the limit for ports connected to it. Ã‚*Since the switch is independent it can support the 9000 among devices connected directly to it. Ã‚*Just wondering then if the internet is accessible as youÃ¢â‚¬â„¢ve forced your computers to 9000 but the ISP is probably set to 1500Ã¢â‚¬Â¦
I was wondering what ISP speed you have? If it were to be 2.5 Gbs or higher, maybe using the 10 Gbs port for your Wan port would have some effect.