出错现象：
[root@localhost ~]# telnet 192.168.1.128
Trying 192.168.1.128...
telnet: connect to address 192.168.1.128: No route to host
telnet: Unable to connect to remote host: No route to host
解决办法：
在telnet服务器上执行：iptables -F 清除所有规则（太暴力了...）
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