Ok, if a wired connection to your ASUS router is working, then DHCP will be working.
So you've connected a wireless device to the ASUS SSID and it's connecting, however there is no internet?
You haven't set a static IP to this device by any chance? ASUS use a different IP range (192.168.50.x as an example) to the HUB so your old static IPs will no longer be valid.