Read the hosts.allow and hosts.deny man pages for the TCP wrappers.
There are ways to invoke scripts on failed attempts.  I even have
a WAV file of Lt. Wharf on STNG calling a security alert if you really
want to get perverted with this.  ;-)

On Mon, Mar 13, 2000 at 12:41:02AM -0800, Wellington Terumi Uemura wrote:
> Hi,list!
> i want to know,howto make my server BEEP on non autorized access?
> kind a ,grab some not friend IP from log trying to connecting to telnet port 
> for example,then make the computer BEEP for infinite untill some responsable 
> for the server check whats going on.
> 
> Thanks
> 
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-- 
J. Scott Kasten

jsk AT tetracon-eng DOT net

"That wasn't an attack.  It was preemptive retaliation!"


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