you can use opendns (http://opendns.com) as a forwarder in DNS and it will make a trick for you. ( block all unwanted domains as you set it ).
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Using DNS for website blocking.
I was wondering if it's possible to use my DNS server to create false forwards in order to website block. All DNS queries in the company first query the internal DNS server before being forwarded out to the ISP for unknown DNS queries via the DNS roots. Would it be possible to forward say "www.myspace.com" to another internal server that displays a blocked notification page. Obviously people would be able to get around it my using the IP, but blocking 95% of people who don't know better would be good enough for now.
I've screwed around with the DNS entries myself and have been unable to get it to work. What entry and where?
My DNS is an active directory integrated 2003.
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by: DrDave242Posted on 2009-11-04 at 10:20:59ID: 25742185
You can accomplish this by creating forward lookup zones in DNS corresponding to the sites you want to block. If you want to block www.myspace.com, for example, create a forward lookup zone for www.myspace.com. Inside that zone, create a blank host record with the address of the server to which you want to redirect traffic (or a bogus address in your network if you just want it to go nowhere).
If you want to block an entire domain (say, myspace.com instead of just www.myspace.com), create a zone corresponding to the domain name. Then, if you specifically want to redirect certain hostnames in that domain (like www), create host records for those hostnames and point them to whatever addresses you wish.
Like you said, this isn't completely foolproof, as anyone who knows the blocked sites' IP addresses will be able to bypass it.