Hi, I am not sure if this problem has been discussed already. I am running red-hat LINUX 2.2.14 and the version of iproute that comes with it. The problem is that whatever I give as a command it tells me RTNETLINK answers : Invalid argument Example : tc qdisc add dev eth2 handle 10: root estimator 1sec 8sec prio bands 3 priomap 0 1 2 I have tried all kinds of combinations and it refuses to do anything...Can anyone please help me?? Thanks, Anand Get 250 color business cards for FREE! http://businesscards.lycos.com/vp/fastpath/