When testing VPN, the IP found by the command line is inconsistent with that of Baidu search

Why did Baidu find IP and ipconfig The result of the command is different 、 Detailed public network IP、 The private network IP、 Network classification （A、B、C）- Dandelion cloud recommend ：[Java Network programming summary ][Java][ Original address ][Link 1]`IP` Can be divided into `Public IP` and `Private IP`, The reason for this kind of planning is `IPhttps://www.dandelioncloud.cn/article/details/1507241499128582146 In the use of Linux Of IPtables A firewall , To limit ip When accessing ports , Each test will be all ip Access is restricted 8080 port , It can be successful , But I got it from this machine ip Add release rule , It really didn't succeed in any way , The original reason lies in , Use cmd It's a private network ip, That is, the private address of the intranet , This kind of address is only used in LAN , Cannot connect to the external network . If you are connected to the Internet, you need the one Baidu found ip.