AC1900 R7000 IP configuration invalid issue on multiple devices

[whib96]

Newest firmware.  Connected to a cable modem.  Connected an iPhone and an Xbox and then every other device cannot get a valid IP configuration including phones, Macs, and Windows computers.  

I reset the router to no avail.  After resetting the modem, another laptop got connected.  But now, the Xbox will not connect.  It seems that only two devices are connecting at a time.  What can I do to solve this problem?

[whib96 · Accepted solution]

Figured it out.  My modem was just a gateway, not a router/gateway.  The router was by default in AP mode, and I had to set it to router mode.

[RMinNJ]

Check the lan settings and make sure its capable of giving out more than 2 IP addresses ?

[whib96]

The LAN setup is grayed out in my settings.  I cannot get into it.  Why would this be?

[whib96 · Accepted solution]

Figured it out.  My modem was just a gateway, not a router/gateway.  The router was by default in AP mode, and I had to set it to router mode.