From: Niki Kovacs contact@kikinovak.net
I'm currently configuring Squid and Squidguard for filtering web access in a public computer room. So far, everything works fine. I know how to configure Firefox to use a proxy, but there's no way to protect that configuration, e. g. a more knowledgeable user might circumvent this configuration. Is there some way to configure an HTTP proxy system-wide?
I think you might have to go this way: http://wiki.squid-cache.org/ConfigExamples/Intercept/IptablesPolicyRoute
JD