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Our current routers fail in spectacular ways when you plug them
into an Internet gateway that issues IP numbers out of 10/8, because
of the way we use 10/8 on the wireless net.  When a gateway
auto-configures, it must refuse 10/8 numbers from DHCP servers.

For our routers to be truly "plug and play," we need for them to
detect a DHCP server offering an Internet connection (default route)
on one of its ethernet ports, and if none is detected, become a
DHCP server for that port, itself.  Routers should periodically
try again to get a DHCP lease, also, just in case they reboot faster
than the DHCP server after a power failure.

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