North American Network Operators Group
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Re: "portscans" (was Re: Arbor Networks DoS defense product)

  • From: Ralph Doncaster
  • Date: Sun May 19 10:00:03 2002 
> > I often like to know if a particular web server is running Unix or
> > Winblows.  A port scanner is a useful tool in making that determination.
> 
> a full-blown portscan is not required here. A simple telnet to port 80 will
> do the job.

A simple telnet to port 80 will sometimes do the job, but often not.
And even your statement "a full-blown portscan is not required" concedes
that a portscan will work in making this determination.