How to configure and setup OpenWrt router with LTE modem

I have linksys ea3500 running openwrt 18.06.0
I want to setup and use with netgear lte modem lb1120 which comes with one ethernet port. How to configure and setup the linksys router?
Do I have to setup the netgear lte modem in bridge mode and connect it to the lan port or wan port to the linksys router? Please help.

You would connect it to the WAN port.

Bridge mode is only needed if you want to take incoming connections, and more importantly if the LTE service provider's network allows incoming connections, most of them do not.

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