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so if i want to ban a user with the 127.0.0.1 (dynamic) i might set the cidr to 8? so ALL the 127.0.0.xxx (or xxx.0.0.1, 127.x.0.1, 127.0.x.1) are banned?
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setting it to 8 would be all of 127.x.x.x To ban 127.0.0.x you need to set it as 24 (32-8)
This wikipedia article explains Cidr ranges in a lot of detail. For a basic idea, take a look at the table about half way down the page:
http://en.wikipedia.org/wiki/Classle...Domain_Routing