this is a cut paste from one of the forums. i was refering to it...
>Please add a panel or a configuration parameter to limit incoming and outgoing bandwidth by ip and port.
You already have the cbq-init script provided in v0.3b2 with SME 5.5
It is a useful and easy way for getting some QOS working with your SME.
You can find it in /sbin/cbq I think.
If you need more info, or if it is too "light" for you, the actual is v0.7, a bit less easy to use. Anyway, you still have the "tc" and "ip" commands of iproute2...