Easytether issues in Gl-mt1300 router

After I setup the easytether at the router, the main webpage still shown 3g/4g modem and the light is flashing not stable light status. I also did to ping the google server, but it shown connection timeout. Why? Can somebody else help me to fix it?

The router’s UI and LEDs may not indicate any easytether status.

Does easytether connect and is up nornally?

Yes, it can go through Internet but cannot ping to the google server.

So http or https works but not ping?

Can you ping google on the phone itself?

ok, I will try it later.