RBK353 AP mode no internet

Thanks again CrimpOn and FURRYe38 for nudging me in the right direction.  I have done multiple factory resets and an enormous number of experiments with different settings.

As it turns out, I have to use AP mode because it is the only way to get DHCP settings served to clients that are wired to one of the satellites.  I have not experienced any problems with AP mode, per se, but thanks for the warnings.

The real problem is that the RBR350 does not accept a comma separated list of gateway IP addresses from a separate DHCP server.  I think this is a bug in RBR350 because, strangely, other Netgear products that I use (e.g. web managed switches GS108Ev3) do correctly pick the first gateway address from the list of those supplied by my DHCP server(s).

A detail: I am operating a HA service, and all storage devices (NAS) and services (e.g. DHCP server) have live copies which reside on more than physical machine with automatic failover capability dropping to an alternative when the first selected becomes unavailable.  When I first experimented with DHCP server settings to see if changing from a list of gateways to a single gateway address made any difference, I missed one of the several locations that I should have changed.  Unbeknown to me, a list of gateways was being served by DHCP to the RBR350 by the one instance that I had failed to adjust.  My mistake, and I paid sorely in time wasted trying to track down what was actually wrong.