Nmap
Posted by Eric Lubow   
Security Tips Make use of security tools out there to test your server's weaknesses. Nmap is an excellent port scanning tool to test to see what ports you have open. On a remote machine, type the command:
# nmap -sTU

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-08-10 13:51 EST
Interesting ports on eric (172.16.0.1):
(The 3131 ports scanned but not shown below are in state: closed)

   PORT    STATE         SERVICE
   22/tcp  open          ssh
   113/tcp open          auth
Nmap run completed -- 1 IP address (1 host up) scanned in 221.669 seconds

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