Update README.md

jicahoo · Sep 12, 2018 · 978e4c2 · 978e4c2
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 ## 常见问题
 * 连不上 (Protocl, IP, Port). SSH, DB Server, Web Server and so on.
+    * 心中要有网络结构
     * 网络畅通：ping <IP>
     * 端口开放：telnet IP Port.  Check it on server: netstat -tuanp |grep XXX to make sure BInd Address is open enough.
     * 其他？traceroute?