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I'm trying to restrict all the computers on a network to only be able to use OpenDNS so I can manage what sites they are allowed to access.

I can't really do this by locking users out of the network settings on an OS level so I'm trying to lock down the Airport Extreme that connects them to the web.

I understand that in theory it is possible to prevent access to other DNS servers from this article:

However reading around suggests that the Airport software prevents me from easily doing this.

Can anyone suggest a workaround that doesn't involve replacing the Airport with something with better admin software? :)

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The airport extreme is an AP - how does it connect to the internet? – Paul Aug 15 '12 at 13:41
It's connected to a Virgin supplied cable modem. Tiny little thing, I'm not sure if it has any kind of software I can access. – Rich Aug 15 '12 at 14:22

Nope, it can't be done on your AirPort Extreme. AirPort Extreme does not provide a way to configure egress filtering.

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