C1200's QoS is different from C5,so we have to try this way, input the total bandwidth there and add a devices in the high quality.

no tried that, can't make sure

try this, disconnect everything from this router including modem, other units in the lan port and connect only one computer to its lan port, try that number again. if you can get in, change its lan...

when you select firewall to high, do you see allow port listed in the web management page?

good video!

the only difference is the wireless speed, WPA8730 is 1750Mpbs while 8630 is 1200Mbps. I think 8630 is suitable for you.