Date: Sat, 21 Jun 2003 13:34:17 +0800 From: "Paul Hamilton" <paul@bdug.org.au> To: "Freebsd-Questions" <freebsd-questions@freebsd.org> Subject: Transparent Proxy going astray Message-ID: <AGEHIFHGNEMPFNCPLONMMEHPEMAA.paul@bdug.org.au>
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Hi all, I have watched/lurked on this list for sometime now, and see a Transparent Proxy question every now or then. None of them have answered my problem. I give it a bash every now and then to see if I will trip over the answer. It hasn't worked, so I will try this list again. I run FreeBSD 4.8 on the gateway, Squid Cache: Version 2.4.STABLE4 Squid.conf has the required lines: http_port 8080 httpd_accel_port 80 httpd_accel_host virtual httpd_accel_with_proxy on httpd_accel_uses_host_header on and the required ipfw2 firewall rules: 00050 271 27520 allow tcp from 192.168.0.10 to any 00060 3 144 fwd 127.0.0.1,8080 tcp from any to any dst-port 80 Interestingly enough when watching the ip traffic on the gateway, I see this on my inside NIC: 08:27:18.735861 192.168.0.2.3276 > 203.10.1.17.53: 1093+ A? www.google.com.au. (35) 08:27:18.922217 203.10.1.17.53 > 192.168.0.2.3276: 1093 2/4/4 CNAME[|domain] 08:27:18.923667 192.168.0.2.3277 > 216.239.39.99.80: S 813553086:813553086(0) win 16384 <mss 1460,nop,nop,sackOK> (DF) 08:27:18.923722 216.239.39.99.80 > 192.168.0.2.3277: R 0:0(0) ack 813553087 win 0 08:27:19.397657 192.168.0.2.3277 > 216.239.39.99.80: S 813553086:813553086(0) win 16384 <mss 1460,nop,nop,sackOK> (DF) 08:27:19.397697 216.239.39.99.80 > 192.168.0.2.3277: R 0:0(0) ack 1 win 0 08:27:19.906095 192.168.0.2.3277 > 216.239.39.99.80: S 813553086:813553086(0) win 16384 <mss 1460,nop,nop,sackOK> (DF) 08:27:19.906153 216.239.39.99.80 > 192.168.0.2.3277: R 0:0(0) ack 1 win 0 and this on my outside NIC: 08:27:18.736970 202.72.147.43.3276 > 203.10.1.17.53: 1093+ A? www.google.com.au. (35) 08:27:18.922026 203.10.1.17.53 > 202.72.147.43.3276: 1093 2/4/4 CNAME www.google.com., (215) The cache_access.log doesn't show any traffic, yet (something) is pretending to be the google website, as there is a reply from 216.239.39.99.80. I have tried to run tcpdump -ni lo0 but there isn't any traffic. Should I be able to see traffic on lo0? Any thoughts on what I am missing? Cheers, Paul Hamilton
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