Server can also share network via USB on mobile phone with an optical interface. We have to deal with this for now.

admin

Without light, the network cable suddenly came to mind that I could use mobile USB sharing the network system CentOS7
Before connecting the server's USB interface on the phone
System input ip a
Check what is currently available
Then after connecting the USB interface on the phone, in the input ip a
The extra one is called ens123
In command dhclient ens123
At this time, the network was connected.