5 `nmap` is designed to allow system administrators to scan large
6 networks to determine which hosts are up and what services they are
7 offering. You can use nmap to test your firewall setting, for example
8 to see if the required ports are open.
10 .Test Razor port (tcp port 2703):
12 # nmap -P0 -sS -p 2703 c301.cloudmark.com
14 Starting Nmap 5.00 ( http://nmap.org ) at 2012-07-31 11:10 CEST
15 Interesting ports on c301.cloudmark.com (208.83.137.114):
19 Nmap done: 1 IP address (1 host up) scanned in 0.17 seconds
22 See the manual page (`man nmap`) for more information about nmap.