Hi guys,
here I face a little problem about CBQ. I share my internet connection with a simple iptable command ->
iptables -t nat -A POSTROUTING -j MASQUERADE
it work fine. now I control bandwidith with CBQ. my current configuration of CBQ is
My PC IP is 192.168.0.50 . nobody get more than 6 KBps without me. Now I want only those IP that I difined (like 192.168.0.51 and 192.168.0.52) get 6 KBps and all other user get nothing! I try with this configure. .

but it doesn't work. any one can help me??

I see you don't write CBQ rules yourself, you use some kind of script that accepts the parameters you posted. Where can I see the scripts? Where are they from?

those script is contain in -> /etc/sysconfig/cbq/cbq-98.service

Short note for you (may be useful later): CBQ is a special service, in fact. Your /etc/sysconfig/cbq/cbq-98.service is a script setting up CBQ using 'tc' command. There's no 'cbq' one. Also, instead of CBQ you can use different other ones like HTB (they differ in the ways they deal with packets that come to one group - or class as it's called). Settings for such services are made of rules (like for iptables).

I see that you're using a script that's similar to http://www.cs.ut.ee/~mroos/cbq.init (the same variables in config file). Now, there's a default rule. All packets that don't go into other defined ones match the default ones. The program also doesn't like settings with '0'. It was designed to limit traffic, but to a positive value, not block it. The best solution IMO is to block using iptables. You have masquerade set, so now you need to add blocking rule. Something like
iptables -A INPUT -s 192.168.0.51 -j ACCEPT
iptables -A INPUT -s 192.168.0.52 -j ACCEPT
with default policy DROP on INPUT should handle this.