地址：www.thegeekstuff.com/2010/03/net…\
1.列出所有的端口
netstat -a
列出TCP协议的端口
netstat -at
UDP协议的端口
netstat -au
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2.列出处于监听状态的socket
netstat -l
列出监听的TCP端口
netstat -lt
列出监听的UDP端口
netstat -lu
列出监听的UNIX端口
netstat -lx\
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3.列出协议的统计信息
nestat -s
比如： Ip:
11150 total packets received
1 with invalid addresses
0 forwarded
0 incoming packets discarded
11149 incoming packets delivered
11635 requests sent out
Icmp:
0 ICMP messages received
0 input ICMP message failed.
Tcp:
582 active connections openings
2 failed connection attempts\
