iptables -t mangle -A PREROUTING -i Quellinterface -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
 iptables -t mangle -A PREROUTING -i Quellinterface -j CONNMARK -p tcp --dport 80 -m conntrack --ctstate NEW --set-mark 0x10