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How best to block all IP traffic to the new .XXX domains

Posted on 2011-09-09
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Last Modified: 2012-05-12
In a Microsoft Windows Server 2003 AD network, is it possible to use Microsoft DNS to block access to all subdomains of the new .XXX TLD? The firewall router is not capable of URL filtering.
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Question by:askrabbit
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Chev_PCN earned 400 total points
ID: 36509463
You can't use DNS to actively block. You CAN stop it from resolving through.
It's as simple as creating a zone for XXX and leaving it empty.
What this does, is it makes your DNS organisation authoritative for that domain (i.e. the only one that can do resolution), so if a client asks for a XXX address, it will come back blank.
Unfortunately if a client uses the IP address, they can still access the site.
You would be best putting in a proxy of some sort.  Free, powerful & easy to administer is squid.
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by:setasoujiro
ID: 36509869
another thing to consider is that people could still use a public dns , instead of your own.
Unless you blocked their ability to change their dns settings
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by:Soulja
ID: 36510150
What type of firewall/ router do you have?
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by:askrabbit
ID: 36510153
Chev_PCN, we did in fact try your suggestion already, but without success. However, I have realised that I was making a mistake when testing by using a fictitious xxx domain/host. I discovered that porn.xxx and sex.xxx are "Safe for Business" placeholder sites. When I used these for testing, I found that the disruption to DNS resolution works fine. Thank you! I understand your point about direct access via IP address. Also, there are plenty of porn sites on .com, etc which would still be accessible. Still, the client asked me a specific question...

Thank you for your comment about proxies. This is also under consideration.

setasoujiro, Fair point, although most users are not local admins and so would not be able to change any workstation IP settings.
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by:setasoujiro
setasoujiro earned 100 total points
ID: 36510271
yeah but they could also just use an online proxy if they really have the pornurge :)
and if this is such a concern to your company i would strongly advice to purchase a webblocking capable device , I can safely say that watchguard offers a strong webblocker/application blocker combined with firewall/Antispam etc,  and is not too expensive either
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by:askrabbit
ID: 36521507
Thank you to both of you for your comments. I have certainly told the company that just focussing on .XXX does not mean no porn... ;-)
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Author Closing Comment

by:askrabbit
ID: 36521520
The first answer was the technical answer to my question strictly speaking, but I appreciate the issues mentioned in the other answer too. Thanks!
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