Maybe you can have a try of this although I don't know if it works : Navigate to the web management page -> Network -> WAN -> MTU Size, input a number less than 1500 such as 1480. If this changes...

There are two ways to configure the ASUS router when the 7210 in your daught's is working on Client mode with DHCP disable: 1. Set the router on AP mode with DHCP disable; 2. Configure the router on...

I think it's helpful for you to provide the LAN IP of all device

@danymarc That's right. Thank you for your reminding. It's a better choice to choose client mode.

Would you please draw a topology image? I feel puzzled for what you describe. A clear and detailed information helps other to solve your problem.

Please have a check on your IP address. If your IP is 192.168.0.x subnet?