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Forum Discussion
CM1200 Modem having to use 2 networking cables for both internet and the configuration page
Since I bought this modem at the end of year 2019, The modem works, but I have a few questions. I guess it's appropriate to have one discussion per question: I have only been able to access the ...
Very bad idea to operate the WAN (resp. the related administration subnet) and the NATed LAN on the very same IP subnet.
If you have your LAN say on the common 192.168.1.0/24 (255.255.255.0) you could always reach the CM1200 management IP 192.168.100.1 passing the WAN router / NAT router.
The WAN IP for the router (also handled by the ISP) but coming in over the CM1200 is typically a public IPv4 address (rarely a carrier grade NAT or private IP subnet). Said that, thre is no need to operate the LAN behind your NAT router "just" to manage the CM1200 - and on the very same IP subnet. The reason is simple: The router requires two different subnets - otherwise it can't route.
Even worse: This second connection bypassing the NAT router will cause many rnadom issues - I don't want to think about it, so could a computer on the LAN receive a public IP address from the ISP, and so on - so it's fully exposed, while not able to talk to other systems on your home [W]LAN.