[K12OSN] transparent proxy setup

Gerald Drouillard gerrylist at drouillard.ca
Wed Sep 3 22:19:28 UTC 2008

Scott Steibel wrote:
> I've got k12ltsp running using centos  (5.0.0EL -64)
> All works fine, except, when I try to run dansquardian with squid as a 
> transparent proxy.   I used IPtables to redirect request to go thru 
> squid to dansguardian then out to the net.
> I followed these instructions.  http://www.linux.com/articles/113733
> The problem seems to be that iptables is bocking either the dhcp or the 
> tftp during the workstation boot up.
> When I stop the iptable service on the server,  the workstations boot 
> right up.   But, of course this leave me with no transparent proxying, 
> no danguardian.
> I googled around a bit, These are my  questions at the moment.
> Seems, like I need to set up a separate box to function as the 
> transparent proxy server with squid?  Is this true?
Another approach is to use the /usr/lib/firefox-3.0/firefox.cfg file and 
There are some other settings, so you may want to google it.

Gerald Drouillard
Technology Architect
Drouillard & Associates, Inc.

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