As you are probably aware, this is a ever green topic.

I have personally tried doing it, testing it and verifying it
and I am myself finding this problem challenging and frustrating.

Most of the scripts will recommend some form of rate limiting
( or policing ) on the download. But the challenge is how to 
determine the correct value for the policing ? 

Lot of the recommendation says use x % over the sales package 
figure. Is this the correct way to do it ? Should it be a more
engineering way to empirically determine it ?

What I noticed is that if I over-specify the x %, then I
will greatly limit the utilizable bandwidth. The LAN users will
noticed significant difference in download speed compared
to when QoS is not running. But if I under specify the
x %, then the entire VoIP QoS has no significance, and
the VoIP quality will be bad.

Any views or comments ?

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