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Solved
Netgear R6220 router vs ARRIS T25 cable modem
Hello, I have an ARRIS T25 cable modem. It is hardcoded to the address of 192.168.100.1. I have a Netgear R6220 router that I would like to attach to the modem. This implies that one side of the r...
The arris t25 has 2x ethernet ports on the back of it. The vast majority of ISP's only support 1 device connected to it.
Reason why is most consumer accounts they only allocate 1 public ip address for it. Its then on the router to allocate private ip addresses.
So unplug everything from the t25 and power it and the router off.
Wait 2 minutes.
Power the modem back on with nothing plugged in.
Wait 2 minutes.
Plug the router into port 1 on the modem.
Then power the router on and wait 2 minutes.
Attempt setup/usage of the router.
Make sure nothing else is plugged into the t25 or it can allocate that 1 public ip address to that device and not the router.
The arris t25 has 2x ethernet ports on the back of it. The vast majority of ISP's only support 1 device connected to it.
Reason why is most consumer accounts they only allocate 1 public ip address for it. Its then on the router to allocate private ip addresses.
So unplug everything from the t25 and power it and the router off.
Wait 2 minutes.
Power the modem back on with nothing plugged in.
Wait 2 minutes.
Plug the router into port 1 on the modem.
Then power the router on and wait 2 minutes.
Attempt setup/usage of the router.
Make sure nothing else is plugged into the t25 or it can allocate that 1 public ip address to that device and not the router.
I also did a factory reset on the Netgear router, and let the Genie navigate to the Internet through the T25. I have connectivity now. The connectivity persisted even after changing the IP address away from the default.
Thanks!