Don't use Portsentry:
Even though I advocated using Portsentry too:
On Wednesday 11 December 2002 11:13, Conor_D_Wynne at Dell.com wrote:
> Cool, didn't know that, mind you, I suck at hacking.
> From the server's side of the equation, you might want to think about
> leaving some ports in your firewall config open (but not actually running
> any services).
>> On these open ports you set up portsentry.
>> Then you wait for someone to smurf your server with nmap or the like and
> tertly have portsentry block out that user's ip permenantly.
> You might even think about having port sentry do a nmap on 'whoever' it was
> smurfed you to begin with.
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