Henrik, The details: >>1. Are you running a TPROXY kernel? yes, we have tried running kernel 2.6.18 and 2.6.16 (following examples in this list) with the patches applyed. lsmod | grep proxy ipt_tproxy 1600 0 iptable_tproxy 15212 0 iptable_nat 7844 1 iptable_tproxy ip_nat 17036 2 iptable_tproxy,iptable_nat ip_conntrack 50264 3 iptable_tproxy,iptable_nat,ip_nat ip_tables 12100 3 iptable_filter,iptable_tproxy,iptable_nat x_tables 11876 5 ipt_TPROXY,ipt_tproxy,xt_tcpudp,iptable_nat,ip_tables >>2. Have you started Squid as root? Yes, i am running it manually and with ./RunCache. We have also tried it starting it as a service, always with all privileges >>3. Do you have appropriate tproxy iptables rules in place? yes, weve tried all kind of rules, always implementing PREROUTING like this one: iptables -t tproxy -A PREROUTING -p tcp -m tcp -i gre0 --dport 80 -j TPROXY --on-port 80 we are now discarting last options, like the MUST tcp_outgoing_address (wich makes that clients times out while surfing)......but any clues are welcome -----Mensaje original----- De: Henrik Nordstrom [mailto:henrik@xxxxxxxxxxxxxxxxxxx] Enviado el: Jueves, 17 de Mayo de 2007 11:12 a.m. Para: Nicolas Royo CC: squid-users@xxxxxxxxxxxxxxx Asunto: RE: Really transparent proxy tor 2007-05-17 klockan 04:37 -0300 skrev Nicolas Royo: > one more thing, > > with tproxy and via on i can see this in our syslog > > May 17 04:37:03 squid-RC9 squid[22653]: tproxy > ip=201.235.156.xxx,0xc29cebc9,port=0 ERROR ASSIGN So something is not quite right with your TPROXY setup. 1. Are you running a TPROXY kernel? 2. Have you started Squid as root? 3. Do you have appropriate tproxy iptables rules in place? Regards Henrik