XP bridge problem

We've bridged ethernet and wireless lan cards under windows xp, bridge is working fine, but is there a program to limit traffic or even disable it that's going to another computer behind the bridge on ethernet network, strange thing is that some programs for network monitoring example DUMeter or BWMeter aren't even aware of traffic that's going throught the bridge computer, it's only aware of traffic which is assigned directly to bridge computer, then instaling firewall on bridge computer and trying to solve this problem with it, didn't either stop traffic passing through it to another computer, is there any other program you would recommend me ? thnx