I'm looking to setup a home network with two APs connected by ethernet.  I think I understand the default network settings for use as a single cerowrt network but I'm struggling how to wrap my brain around how a second router should be configured so that the second access point isn't just another level of NAT deeper inside the first router.

Internet ---- cerowrt A ---- cerowrt B

Configuring the B router is what is confusing me.
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Sandy McArthur