How to set static route in yocto for rpi


Dear Team,

I'm using yocto-dunfell poky for my CM3(Raspberrypi) OS.

In this I want to set static route for wan port. So how I can do the same.

I've tried several method from Internet for setting static route in linux, not succeeded. 
Please help me with this to solve this.

Thanks and Regards.

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