AX6000 Router cannot access my Arris Modem Web Manager
I just replaced my Arris SB6190 cable modem with an Arris SB8200. My ISP is Spectrum. When I was using the SN6190, I could bring up the Arris Web Manager at 192.168.100.1. When upgraded my modem to the SB8200, I no longer could access this web address. My router is at 192.168.0.1. I can ping the 192.168.100.1 address. When I run Windows Network Diagnostics Troubleshooting, the response I get is "website (192.168.100.1) is online but isn't responding to connection attempts". If I connect SB8200 directly to my laptop without using the router, I can access the Web Manager.
What settings in my router could be causing this? And how can I resolve this?