>> What to do in future if you dont know the Ip Adress of Source because of >> DHCP Server? >That's an other problem. Maybe you can use the dhcp configuration so each >time an ip-address is given to a pc, the tc scripts are updated. And you can >use the hardware address to identify the client who requested an ip. Or use dhcpcd to bind IP's to MAC addresses.. You can do quasi-static IP's that way. An entry in /etc/dhcpcd.conf would look like this: host <HOST-NAME> { hardware ethernet <MAC ADDRESS>; fixed-address <IP ADDRESS>; } Mike.