nmap scan for Dual-OS system

[uday kumar kunta <udaykumar_kunta () yahoo com>]

Hi all,
   
  When we run nmap scan(OS scan) for a Dual-OS system,it should give only two OS details.But in my case it is showing 
comma separeted list of 3 operating systems.But I know that the system is dual-OS one, with Fedora and SuSe.Why it is 
showing like that?
   
  This is the output i am getting:
   
  [uday_kunta@hydhtc47490 ~]$ nmap -O 172.21.130.81
  Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2006-04-21 14:06 IST
Interesting ports on 172.21.130.81:
(The 1644 ports scanned but not shown below are in state: closed)
PORT      STATE SERVICE
21/tcp    open  ftp
22/tcp    open  ssh
23/tcp    open  telnet
80/tcp    open  http
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.4.0 - 2.5.20, Linux 2.5.25 - 2.6.3 or Gentoo 1.2 Linux 2.4.19 rc1-rc7), Linux 2.6.3 - 2.6.8
  Nmap finished: 1 IP address (1 host up) scanned in 2.185 seconds
  ----------------------
  How can we know whether the system is dual-OS or triple-OS using nmap?
   
  Thanks in advance,
  Regards,
  Uday

                        
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