Try this link http://wiki.squid-cache.org/Features/Tproxy4 Anyway tproxy is a great project and a real transparenty, without any special performance request, and you can be a sure that you have some configuration problems Best regards Elyasaf -----Original Message----- From: mtpr [mailto:mtpr@carreira.com.pt] Sent: Friday, May 29, 2009 10:08 PM To: tproxy@lists.balabit.hu Subject: [tproxy] Is tproxy a real transparent proxy? I am testing tproxy with a vmware Centos-5.3 virtual server. I installed squid-3.1, iptables-1.4.3 and kernel-2.6.28.3. Everything seems to be working, unless one... There is a proxy behaviour I thought it would be expectable, but I found it doesn't work the way I thought. Here is the example: If I create a cgi-bin script in a apache webserver that prints the client ip address like this one: #!/bin/env python # coding: utf-8 import os print 'Content-Type: text/plain' print print os.environ['REMOTE_ADDR'] I thought that, in a real transparent proxy, it would give me the original client ip address of the browser computer. But no! Like the old transparent proxy way (not tproxy), it prints the ip address of the proxy server. If I want the original ip address, I need to read the environment variable HTTP_X_FORWARDED_FOR. It doesn't seem to be a "real" transparent proxy. Is this the expectable behaviour, or could be something wrong with the way I setup my tproxy? mtpr