http://www.zrblog.net/7027.html
http://www.2cto.com/Article/201309/245198.html
http://blog.163.com/dk_linux/blog/static/203226166201261323349658/
http://blog.chinaunix.net/uid-26495963-id-3279216.html
telnet ip 端口
举例：telnet 192.168.0.33 22
原文：http://www.cnblogs.com/bandbandme/p/4701208.html