# 可以验证端口是否开放
[root@rexen bin]# telnet 172.20.133.121 10050
Trying 172.20.133.121...
telnet: connect to address 172.20.133.121: No route to host # 未开放的状态
[root@rexen bin]# telnet 172.20.133.122 10050
Trying 172.20.133.122...
Connected to 172.20.133.122.
Escape character is '^]'. # 开放的状态
Connection closed by foreign host.
[root@rexen bin]#