Question I seem to be restricted from changin the LAN/Roter IP address. It won't let me change it to anything other than 192.168.x.x I'd like to use 15.X.X.X Why is this happening?

I have a X5700 deco mesh router connected to a Optimum (ISP) Arris TM1602 modem. The link is fine - Green Light. But there is no internet traffic. Once I connect the X5700 to a standalone ethernet swi