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Block Pandora using DNS in a AD 2003 environmnet

Posted on 2011-04-20
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Hello Experts,

We have a ton of users that are using pandora and eating up bandwidth.  I would like to configure DNS so that when a user tries to access www.pandora.com, they are rerouted to our internal web page.  Based on information that I have found here and on the web, I have done the following:
1.  From our DNS server (which is also a 2003 domain controller), I have created a new forward lookup zone.  I have tried this as both a primary DNS zone and an AD integrated DNS zone.
2.  Once the zone was created, I added a new A record.  For the name of the A record I entered "*".  For the IP I entered the internal IP of our intranet site 10.10.10.1.
3.  I cleared the DNS cache
4.  Opened IE and typed www.pandora.com and was taken right to the pandora site.

What am I missing here?

Thanks,
Nick
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Question by:ndalmolin_13
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Kaffiend earned 2000 total points
ID: 35437655
1.  Create an A record - www, and point that at your intranet address ?

2.  Also, rather than use " * " for the first A record that you created, you should just leave it blank.
(you can test whether this is good advice by typing in *.pandora.com in your web browser)

Try that.
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by:ndalmolin_13
ID: 35442777
That did it
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by:Kaffiend
ID: 35442920
You blocked Pandora?  Let the phone calls begin !!!  :-)

BTW, you do realize that there will always be some users who get around the DNS trick - an enterprising music-starved person might just use an IP address.  Might be better to do it at the firewall if you have equipment that allows you to do that.
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by:BillMars1849
ID: 35691402
I had a very hard time finding servers to block at my firewall but have had success blocking 208.85.40.0/24.
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by:Kaffiend
ID: 35693196
BillMars  - that's kind of harsh, blocking 200-something IPs.  Hope there's no collateral damage  ;-)
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Expert Comment

by:BillMars1849
ID: 35693259
We are a small company and if we have any users that can't get to a site I will hear about it pretty quickly.  So far it hasn't been an issue.  I know Pandora is using a lot of those IPs although all that I have seen have been in the sub .100 range so I suppose you could probably get away with using a /25 instead.
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