[tproxy] question about tproxy on bridgy mode

Hi all, I read some one have the expirence on tproxy and squid using in bridgy mode on internet. So I met some problems of this case, I think you can give me some important information. Thanks in advance. When I configure the tproxy and squid in tproxy mode, and run the client requesting. The tproxy target can be called and redirecting the packet, but the request packet is also directly passed to the server. The server gave the reply correctly. But the local host process never client tcp SYN packet. I did not know what's the real problem, I think it is about the routing policy. Could you offer me some help please! Thank you! Alex 2009-02-05