bandwith limitation ...

[Petar Zivanovic]

how or can i limit bandwith from/to some IP or per connection base ...
4.emp.
    we limited out outgoing band. to 512k from news readering server to
users
    limitation of 300 user :) ....
    sometimes there are 100 sometimes 250 users reader/writeing etc...
    some user have up 56k dial-up ... some have cable,dsl,T1,or even 100Mb/s
LAN
    and when someone over net have T1 ... and he peak_out smaller user...
    i want to limit to 64k per connection .. or per IP ... :) ...

can i do it from INN or must i do it from OS ... linux ...
?