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Nighthawk X6 : cannot connect to 2.4G printer when laptop on 5G
I just got a Nighthawk X6. It's got great coverage, but when my laptops are connected via 5G then I cannot print anything. My printer (like all others it seems) can only connect via 2.4g. Wired to ro...
The wireless clients behind the RT-56U cannot see the wireless clients behind the X6 and vice versa. Moreover, the Wired PCs cannot see any wireless clients. Even with wireless disabled, the cable modem is still operating as a router.
My recommendation still stands: convert the X6 and RT-56U to APs. BTW, you could have used cheaper range extenders as APs.
The 2.4 GHz, 5 GHz and wired networks should generally be reachable to each other but there are a few caveats.
Make sure that your printer is not connected to the guest network. For that matter, make sure your computers are not connected to the guest network, too.
If you set up the X6 to use VLANs, then it's possible that you have segregated one or more of the networks (2.4 GHz, 5 GHz, wired) from each other. Unless you have a specific reason to do this, I would remove the VLANs.
If neither of these are the case, then make sure that all of the devices are on the same subnet. You didn't mention if your ISP box has a built-in router. If it does, then it's possible that you have segregated your devices by placing the X6 in between the printer and computers. You could fix this by putting the X6 into AP Mode. This will disable the router/firewall/NAT/DHCP functions on the X6 and let your ISP router handle all these functions. OTOH, if your ISP box is a basic modem, then something else is going on. It might help for you to provide an illustration of your network.