Can't access DPC3939b UI

​I was changing the DPC's private lan IP to 192.168.100.1 so it wouldn't be in the 10 range (as I use the 10 range behind me router and still want to be able to access the DPC's UI and avoid possible overlap of address space.​

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​well now the DPC UI is unreachable.​

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​I did a "show IP arp gi 0/0" on my router and it shows a 192.168.100.1 MAC/IP resolution but I just get time outs if I try to ping it.​

​I even connected my computer directly to the DPC and still can't get it to reply to a ping, though when I connected my computer directly my computer did get a DHCP IP and in the lease info it showed 192.168.100.1 as the DHCP server and gateway but still couldn't access the UI or ping it.​

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​I did try the DPC's public lan side IP and that did bring up the UI but when reaching it that way it won't accept the cusadmin login so still a no go.​

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​Also I want the "xfinitywifi" turned off.​

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​hopefully someone can help.​