Hi, Currently I´m using the following iptables rule to mark packets in order to shape traffic: iptables -A PREROUTING -i eth2 -t mangle -p tcp -s 192.168.1.50/32 -j MARK --set-mark 50 So my question is, is there a limit in the numbers that can be used as marks? And also, can only numbers be used as marks? How about: iptables -A PREROUTING -i eth2 -t mangle -p tcp -s 192.168.1.50/32 -j MARK --set-mark 5424 or iptables -A PREROUTING -i eth2 -t mangle -p tcp -s 192.168.1.50/32 -j MARK --set-mark ABC Same question for HTB tc rules'' class id numbers and handle numbers. Thanx, Edo