How to ban by IP?

So theres a hacker on my server and he just blows everything up usually Infistar catches him but he keeps changing his CD key and im wondering how would i ban him by his ip?
 
Thank you and you wouldent happen you know how to get rid of the auto message that goes off now and then saying This server is monitored and secured by bla bla bla ... it just gets kinda annoying
 
People can change their GUID too.
Yes but isn't that technically more difficult ? Requiring something to generate them and possibly something to tell arma it's legit? I feel like for IP you just need to restart your router? Not sure though.
 
Yes but isn't that technically more difficult ? Requiring something to generate them and possibly something to tell arma it's legit? I feel like for IP you just need to restart your router? Not sure though.

Could even flush your settings, so no need to restart your router :p But most hackers are scriptkiddies and not interested enough to do this. They see they get banned/are banned and move on to the next server
 
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