Full connection between lan and wan

I have cisco linksys wrt169nl with openwrt 19.07.9.
This router will be subrouter in my local network and I want to make full connection between wan and lan.
For example, my lan network is 192.168.2.0/24 and wan is 192.168.1.0/24. I want to ping form computer on 192.168.1.10 to 192.168.2.11.
How to do that?
Thanks for help

If you want full connectivity, set it up as a dumb ap?

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