Simple question on gateway

[poisonFW]

Hi, I am new on opnsense and I try to create a simple setup like this image
In this scenario i want to go out with LAN1 towards WAN1, and for this i create a Gateway with IP 192.168.10.1 relaunch pkgs towards default GW of WAN1, and relative rules on firewall to permit all traffic in and out, but this not work, i need something else? like loopback or virtualIP? Or I just wrong with my setup?
Sorry but i can not find some tutorial for that simple things. thx

[bartjsmit]

Your WAN IP is an RFC 1918 address. In the OPNsense web GUI select Interfaces, WAN and untick 'Block private networks'

Bart...