My question would be whether or not the ability to ping inside the SMC network and communicate device to device is important. My home network is very similiar to your diagram, the only difference is an unmanaged gigabit switch in between the two routers. Substitute new CGN3 for SMC and older Dlink DIR-655 for your 891. With nothing else hooked into the switch, my network would look like yours. It can be done very easily. Disable the DHCP on the 891 and set it to accept the address that the SMC assigns to it and leave the firewall functioning. As long as you are not fussy with the device addresses, they will originate from the SMC. I've run this same configuration with the SMC, the DCP3825 and now with the Hitron CGN3. In my case the second router functions as an access point, and is invisible to the network but it will run wired or wireless as required and ping the outside world as required. If I ever have to reset any item, I have to reset back to factory defaults, make the changes, save and reboot. Back in business. I haven't looked at the settings for weeks, and normally have no need to. You could probably set the second router to an address completely outside of the range of the SMC, and enable the DHCP for the 891 in order to assign its own address to devices that are connected to it. In that case you should be able to log into both routers when needed. As long as you are normally running pc's / laptops etc. behind the 891, the first configuration with the DHCP disabled should work for you.
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