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Redirect to squid with IPTABLES

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Hello all --

I have a working copy of squid setup -- out of the box install, no config
changes except the allowed hosts.
When I set my browser to use squid directly, everything works fine.
However, I'm trying to redirect traffic from a specific host on my network
to the squid without actually setting up the proxy in the browser using
iptables.

My iptables line is as follows:
$IPTABLES -t nat -A PREROUTING -p tcp --dport 80 -s 192.168.1.140 -j DNAT
--to-destination <external_ip>:3128

This line does route the traffic correctly, but I get an Invalid Request
error from squid:

----

ERROR
The requested URL could not be retrieved

While trying to process the request:

GET / HTTP/1.1
Host: www.google.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.5)
Gecko/20060719 Firefox/1.5.0.5
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=
0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

The following error was encountered:

    * Invalid Request 

Some aspect of the HTTP Request is invalid. Possible problems:

    * Missing or unknown request method
    * Missing URL
    * Missing HTTP Identifier (HTTP/1.0)
    * Request is too large
    * Content-Length missing for POST or PUT requests
    * Illegal character in hostname; underscores are not allowed 

Your cache administrator is webmaster. 

-----

In the squid log:
Cache.log: 2006/07/31 10:12:47| clientReadRequest: FD 12 Invalid Request
Access.log: 1154365967.274     11 <my_ip> TCP_DENIED/400 1750 GET
error:invalid-request - NONE/- text/html

-----

The HTTP header looks fine to me, and squid really isn't giving me enough
data to troubleshoot further...

Any ideas of how I should proceed in troubleshooting this?

Kind regards,

Evan Fribourg
Web Application Developer
Deniro Marketing
mailto:evan@xxxxxxxxxxxxxxxxxxx


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