How to ban an IP address...

I'm getting a few messages like these lately... How can I ban the IP address?

The remote system xx.xx.xxx.xxx was logged attacking host xx.xx.xxx.xxx,
this is an automated warning; please do not ignore this message!

xx.xx.xxx.xxx was found to have exceeded acceptable inbound packet flow, your
APF (Advanced policy firewall) installation on this host is configured
to dispatch this e-mail and/or take other such actions

Hope you can help?

 

 

 

 

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