内网和外网之间的通信

内容：

参考链接

https://cloud.tencent.com/developer/article/1748416
https://www.cnblogs.com/ranyonsue/p/9713992.html
https://blog.csdn.net/hejun1218/article/details/67633238

https://www.cnblogs.com/flashsun/p/10731994.html