Hi all, that is yet another problem I can't solve. I want to use the iptables to match the packets to be queued but do not know how to tell my tc queues wich marked packages to use. EXAMPLE: ppp0 with (768Kbit downstream and 128Kbit upstream) the privileges local port 27005 should get 512/96 # the marked packets below shall be privileged. $IPTABLES -t mangle -A PREROUTING -o ppp0 -p udp --sport 27005 \ -j MARK --set-mark 21 $IPTABLES -t mangle -A POSTROUTING -i ppp0 -p udp --dport 27005 \ -j MARK --set-mark 22 # the other packets may get the remaining bandwidth # attach cbq to device ppp0 with handle 1: (1:0 ?) $TC qdisc add dev ppp0 root handle 1: cbq bandwidth 768Kbit avpkt mpu 64 # create the root class (1:1) $TC class add dev ppp0 parent 1:0 classid :1 est 1sec 4sec cbq \ bandwidth 768Kbit rate 768Kbit # create class A (privileged 1:10) $TC class add dev ppp0 parent 1:1 classid 1:10 est 1sec 4sec cbq \ bandwidth 768Kbit rate 512Kbit allot 1514 maxburst 50 avpkt 1000 $TC qdisc add dev ppp0 parent 1:10 sfq quantum 1514b perturb 15 # create class B (the remaining 1:20) $TC class add dev ppp0 parent 1:1 class 1:20 est 1sec 4sec cbq \ bandwidth 768Kbit rate 256Kbit allot 1514 maxburst 50 avpkt 1000 $TC qdisc add dev ppp0 parent 1:20 sfq quantum 1514b perturb 15 END EXAMPLE. So. But how do I tell TC to use the iptables marked packets to queue? Many many thanks, Christian.