Sounds like you are looking for documentation on QoS in the linux kernel.
http://www.google.com/search?hl=en&q=QoS+linux+documentation+2.2&btnG=Google+Search
> Greetings,
>
> I have a Redhat Linux 7.0 box with the 2.2.x kernel. I am trying to
> throttle each network card to 256k up/down. Is this possible? I see
> very little documenation on bandwidth throttling.