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Old 08-09-2004, 07:51 AM   #1
Noerr
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Registered: May 2002
Location: Dalec, HU
Distribution: Redhat 7.3
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Can I Disable Proxy usage?


Hi,

We have blocked certain (guess what kind websites on our corporate net, but now people just use external proxy servers to access them.

Is there any way to detect/disable that, with iptables only?

We have NATed network with only port 80, 443 allowed to be forwarded to web, and aren't using and own proxy server, but still it is possible to use external proxy or even a simple php page on remote server to forward and display blocked website to clients on local net.

Do we need to install squid or similar to be able to block some sites or even that won't help?


Any Clues?

Thanks
 
Old 08-09-2004, 08:10 AM   #2
maxut
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Registered: May 2003
Location: istanbul
Distribution: debian - redhat - others
Posts: 1,188

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are there proxy servers which can use port 80 and 443 ?
if it is so, u can block this type of domains with squid. i think it is not good idea to block them with iptables.

there is a redirect program for squid. it has database which includes porn addware warez proxies.. it is called squidguard. u will be able to block porns warez and etc.. also
www.squidguard.org

redhat and fedora rpms:
http://dag.wieers.com/packages/squidguard/
http://dag.wieers.com/packages/squidguard-blacklists/

u can choose dansguardian too. i didnt use it, so i dont have a certain idea about it.
www.dansguardian.org
 
  


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