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I have a series of routers that I want to have open (no pre shared keys/passwords or MAC filtering). I currently run dd-wrt on all of them and use WifiDog to force people to login when connecting.

Without limiting access to the network, what things could I do to increase security?

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Run a web filter of some kind (I recommend untangle). Blocking access to sites that promote illegal activity, pornography, etc will help keep things secure.

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Would you say something like OpenDNS' filtering suffice? – bjtitus Jul 15 '09 at 16:05
Sure! dd-wrt supports OpenDNS very well, actually. – Russ Warren Jul 15 '09 at 16:14

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