Two Routers, one problem. Invisible devices?

IntrepidBongos

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Jan 25, 2015
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Hello all.
I am using a standard Comcast ARRIS TG1682G as the modem in my house.I am using it both in Ethernet and wireless mode.

The walls of my house are particularly signal-resistant, and the back room is a bit far from where the modem in the front of the house is, so I purchased a D-Link AC3200 Ultra Tri-Band Wi-Fi Router, put it in the back room, and connected it to the Arris modem via Ethernet cable.

It works like a charm, with some of the people here using the ARRIS device for wifi, and others in the back using the D-Link.
Except for one thing: I can't see any of the devices connected to the D-Link AC3200, but I can see the D-Link device itself in the list of "connected devices" on the comcast xfinity gateway, (a browser window) along with the other devices connected to the ARRIS modem via wifi.

1: I can't seem to access the address of the d-link window, (I was able to do it when configuring the D-link, via a QRS wifi app on google play) and I want to be able to change the setting from my main computer at will.

2: I want to see all the devices connected to the D-Link wifi signal as well.

Any ideas on how to make that happen?
thanks.
IB