Ecm disconnect in Linux

My MangOH Yellow cannot ping to 192.168.2.2 shortly after connecting to the PC (unbuntu 16.04)

I have tried to refer to this (but I have not installed the modem manger on my PC)

How can I keep connection with MangOH in Linux?

how about manually set the following in PC?

sudo ifconfig ecm0 192.168.2.3

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It can help me, thanks!