[K12OSN] web filtering with SquidGuard

Trond Mæhlum trond at maehlum.net
Tue Feb 7 10:39:47 UTC 2006

Eric Harrison wrote:
> Trond Mæhlum wrote:
>> We are filtering unwanted webpages with SquidGuard. We set the
>> transparent proxy script, using iptables, to redirect all port 80
>> surfing to squid. We have been very happy with our solution. But now it
>> has come to our attention that our efforts to block unwanted webpages
>> are easily bypassed. The students use web-proxies instead. They use
>> pages like proxypop.com to jump directly to the banned pages.
>> We are blocking these sites as we discover them, but there's just too
>> many of them... Our installation of SquidGuard is installed on a Debian
>> Sarge machine. It doesn't auto-update it's databases in any way as far
>> as I know. Is there some way of updating SquidGuards database of blocked
>> urls and domains?
> This is a fun one!
> The quick answer:
> I've recently added a proxy category to the blacklists that I make
> available. Feel free to update from me if you wish...
>   rsync -Pav filter.mesd.k12.or.us::filtering/ /path/to/your/blacklists/
> The K12LTSP update script (/usr/sbin/update_squidguard_blacklist) should
> be easily adapted to your Debian setup.

Thanks a lot for this! This will do nicely.


> The near-future answer:
> The alpha release of the next major Dans Guardian release
> (dansguardian.org) has some interesting features that are useful in
> dealing with the "proxy issue".
> The "reality" answer:
> Filtering technology will always be easily bypassed, it doesn't matter
> what technology you use. Well, maybe not "easily", but if the kids have
> an incentive to get around filters they will ALWAYS be able to do so.
> Supervision is the only truly effective method...
> -Eric
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