Disabled Wireless Radio On Westell

I have a westell DSL modem/router supplied by Frontier. It connects only to the telephone line and via cat5 to my main router, a cisco EA6500. Everything seems to be working fine, I just would like to understand a few things.I disabled wireless radio on the westell, enabled it on the cisco, so I have just one WIFI network active.I know I am not supposed to have two DHCP servers active, but I did not know how else to be sure the CISCO would get a good address, so I left DHCP active on the WESTELL, and also enabled it on the CISCO to provide service for the rest of the net.The WESTELL admin interface is at 192.168.1.1, and assigns addresses in this range.According to the WESTELL, the CISCO is at 192.168.1.27, which I assume was assigned by DHCP.The CISCO has an admin interface at 10.144.224.224, and assigns addresses in this range to all the other devices on my net.As I say, everything works.I can access both router admin pages with a browser on my main 10.144.224 network, and can ping both.But I don't understand why it works.What rules allow me to talk to the WESTELL admin page from the CISCO private network, but do NOT propagate the DHCP access which is at the exact same IP address.

It is great that it works. But should I really have disabled DHCP on the WESTELL and assigned a static address to the CISCO? Or is this situation actually provided for in the rules, not just a lucky accident that it works?Why does the scanner say that the CISCO DHCP is "Unknown" rather than Authorized or Unauthorized? Is there something I can or should do to get it to be "Authorized"? I can ping 192.168.1.1, but not the 192.168.1.27 (times out), and yet when I ping a non-existent 192.169.1.3 I get "Reply from 192.168.1.27: Destination host unreachable".