Cant find ip address of network devices

Hi guys,

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So ii recently just got a new router, an Asus AC1200G+, and i'm using it as my hub of my house. This is my network setup at the moment.

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I got my internet cable hooked up to my Adsl router(which has dchp disabled) with my lan cable connecting from my adsl router to the wan port on my Asus AC1200G+, now i connected all my lan cables into my Asus, as well as another router that im using as a switch which also has dchp disabled. This router has a wifi extender connected to it along with a home server. So my problem is that i can not see my main router that provides my adsl as well as my wifi extender as home server, nor can i connect to it via the router setup page. Its like, the asus is blocking or overiding those ip address.

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Thanks so much in advance.