[tproxy] Redirect to proxy via TPROXY target didn't work.

Hi, I'm running Linux 2.6.22, Iptables 1.3.8, with Tproxy 4.0.3 patches I've added the following rules in iptables : iptables -t tproxy -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j TPROXY --on-port 50080 iptables -t tproxy -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j TPROXY --on-port 50080 but nothing happens, connexions to port 80 are not redirected to local port 50080. Can I use NETMAP target in nat table while using tproxy ? Did I miss something ? thank you.