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I know how to edit my hosts file on osx, how can I block the range 78.31.8.0/22? What do I put in the hosts file?

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You cannot.

/etc/hosts is not for blocking – it is for translating domain names to addresses (when other methods are unavailable) – more specifically, an exact name to a single address. If a program tries to access the address directly, the system won't even touch /etc/hosts, because there will be nothing to look up.

Use a proper firewall, such as ipfw.

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A simple way to null a range of ip is:

route add 78.31.8.0/22 lo

Use the routing table to do it :)

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how can I access the routing table? – John Dec 6 '11 at 13:22
    
You can just try the command I posted if you are using GNU/Linux :) – Felix Yan Dec 6 '11 at 14:48

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