One solution pops into my mind: Squid together with Dansguardian.
I dunno if it can do all the things you desire but its worth the look.

more information:


Google has a lot of information as well.
Good luck !


On 8/8/05, Devdas Bhagat wrote:
> Does anyone have suggestions/recommendations for a HTTP proxy (cheap/free=

> which can filter based on content. Preferably something capable of
> Bayesian analysis of content? It needs to work in ISP environments, so
> transparent proxy support would be ideal.
> Traffic to be filtered is outbound from the browser to the server.
> Thanks
> Devdas Bhagat
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> firewall-wizards mailing list

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