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Nmap is used under Linux on a large network port scanning tool, which can detect the server tcp / ip port is now open. You can run it to make sure that have banned out unsafe port number should not be open. nmap homepage in http://www.insecure.org/nmap/index.html
Here's a simple example:
[Root @ sh-proxy / etc] # / usr / local / bin / nmap public.sta.net.cn
Starting nmap V. 2.12 by Fyodor (fyodor@dhp.com, www.insecure.org/nmap/)
Interesting ports on public.sta.net.cn (202.96.199.97):
Port State Protocol Service
21 open tcp ftp
23 open tcp telnet
25 open tcp smtp
109 open tcp pop-2
110 open tcp pop-3
143 open tcp imap2
513 open tcp login
514 open tcp shell
7000 open tcp afs3-fileserver
Nmap run completed - 1 IP address (1 host up) scanned in 15 seconds
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I think it is the best use nmap port scanner tool.
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