> I cannot find the QoS or anything related to that on my router > settings page. [...]
Visit http://netgear.com/support , put in your model number, and look for Documentation. Get the User Manual (at least). Read. Look for "QoS" or "Quality".
If a feature can't be found on the product, and it can't be found in the product documentation, then I'd take the hint.
The R6120 is a bottom-of-the-line router; it's missing many things.
