Yes, I would disable dhcp on the wan interface. And leave dhcp enabled on the lan.
You can change the ip ranges if you need to later , but the below should work as a PoC to see it working.
for the lan interface on router one
- use ip 192.168.1.1 (and therefore that whole range up to 254) on the lan port.
- Create a static route for 192.168.2.0 (/24) 255.255.255.0 , gateway 192.168.1.2
On router two,
- use ip 192.168.2.1 for its lan.
- assign 192.168.1.2 to its wan port .
- Add static route for 0.0.0.0 or default gateway if option is available to point to 192.168.1.1
- Disable dhcp on the wan interface, but that should already be the case after assigning an Ip.
- Ensure natting/ masquerade is disabled on the wan interface
Connect an eithernet cable between any lan port on router 1 , into the wan port on router 2.
Should work. The above assumes you haven’t modified the dhcp defaults on the lan interfaces, which only use ip ending between .100 and up to .254 , leaving the low ends from .1 up to .99 available for static assignment.