Transparent proxy single machine question

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I am trying to build a single machine that performs web filtering (using DansGuardian) for several users.
The box (Morphix/Debian system) will be behind a cable router and has five users (kids). I have running Dansguardian and Squid correctly in normal proxy mode. The next step is to make the proxy transparent
so that users cannot bypass the Danguardian/squid path simply by telling their browser to connect directly.
I have looked around and see instructions on this at several places (mostly for non-single machine implementations)
and know I need a line something like like:


iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8181

      where 8181 is where Dansguardian is listening.

I also need to configure squid with (I think) :

http_port 3128     # where squid is listening
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy  on
httpd_accel_uses_host_header on        //
httpd_accel_single_host off

The question is, on a single machine, will this work? The part I can't figure out pertains to when squid finally wants to send out the actual
request to the internet, isn't that a port 80 request that the above iptables rule will redirect back to Danguardian??
Please reply all as I am not quite sure than I have joined the list correctly.
Thanks in advance
Ken S.








http_port 3128
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on


Squid 2.4 needs an /additional/ line added:

httpd_accel_single_host off







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