vpn access speed

how could i limit the a group's total internet access speed ?
for example group a has a speed 50 mbit in total
and group b should have 25 mbps
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The following link makes two suggestions for add on software. http://forums.isaserver.org/m_2002032425/mpage_1/tm.htm#2002032475 

I know server 2008 now includes QoS but i think that can only be controlled through group policy rather than regular vpn clients. If possible, I think network switch level QoS may also be an options, for example if certain vpn client traffic comes in or out on a specific network switch port, you may be able to throttle bandwidth at that level.

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