Hi guys Recently asked on squid mailinglist. But I fear this is more deep issue, so I ask here. Hope someone can help. I configured a transparent proxy environment using TPROXY following the howto on the squid wiki http://wiki.squid-cache.org/Features/Tproxy4 I setup a tproxy port in squid on port 18080 and created the following iptables rule: -A PREROUTING -p tcp --dport 80 -j TPROXY --on-port 18080 --tproxy-mark 0x1/0x1 But squid does never see packets coming in. So I tried with the following tool: https://github.com/kristrev/tproxy-example The same, packets are not seen. By chance I tried to redirect to port 80 instead of 18080, in order that redirection does not happen at all, and then packets were seen by the tproxy-example tool. Seems that redirection is not working correctly or not at all. I proved with iptables logging rules that routing is correct, because packets are coming in the INPUT chain instead of FORWARD and are marked as they should be. Also I see the following debug output when compiled the tproxy iptables modules with -DDEBUG: xt_TPROXY: tproxy socket lookup: proto 6 c0a80b37:37894 -> c2e8688e:18080, lookup type: 2, sock (null) xt_TPROXY: tproxy socket lookup: proto 6 c0a80b37:37894 -> c0a80b0f:18080, lookup type: 1, sock f4453700 xt_TPROXY: redirecting: proto 6 194.232.104.142:80 -> 192.168.11.15:18080, mark: 1 which I would say means socket lookup actually *is* taking place and it even finds the correct squid socket. looks all correct. But why then there is no accept() on server side? I tried with both, squid 3.2.1 and 3.3.8 and with kernels 2.6.32 and 3.2.54 and combinations. Always the same result. (I know 2.6.32 is buggy, that's why I tried with 3.2.54 as well, which should be sufficient according squid wiki) I flushed every iptables rule, no drop rule anywhere, no nat. Routing is this: ip route add local 0.0.0.0/0 dev lo table 100 ip ru add fwmark 1/1 lookup 100 (tried with both lo and eth0) also disabled all rp filters. in fact, it is working with port 80 -> port 80, it is not with port 80 -> port 18080, so setup should be ok i guess. It also does not work when I use another target port, like 9876 instead of 18080. Do I maybe need a more recent glibc?? (I guess not) Does anyone have some hints where I could look at in order to solve this? Thank you in advance Peter -- :: e n d i a n :: security with passion :: peter warasin :: http://www.endian.com :: peter@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
