And that is not a "cable" modem - that is a gateway… Ie modem/router combo device..
Which device do you have here?
http://www.hitrontech.com/product-category/cable/
CGN3ACSMR and it looks like the CGNV4.
Example here hitron cable modem quick start guide
https://www.cox.com/content/dam/cox/residential/support/internet/print_media/Hitron_CDA30360_Quick_Reference_Guide.pdfAnd that states 192.168.100.1, etc..
The sticker on the unit says 192.168.0.1 and that's the address I used to configure it, before I put it in bridge mode.
And I do agree there for sure is misuse of terms.. A modem is just that a modem.. You can't put it i bridge mode because there is no other mode ;) Its a "modem" Now if its a gateway then then it can provide multiple functions - it is the modem and router in 1 box. Which those yes you can put in "bridge mode" which turns off its router functions.. And or they can also have some ports that give you your public while others give you a routed/nated rfc1918 address, etc.
I have it in bridge mode, so it functions strictly as a modem. I haven't seen the router functions in it in about 1.5 years, since I put it in bridge mode. On this device, there are only 4 connectors on the LAN side. In gateway mode, they're just 4 switch ports connected to the gateway. In bridge mode, you can connect 2 devices and get IPv4 & IPv6 addresses for them. In gateway mode, it's the usual NAT on IPv4 and a single /64 on IPv6.
And then there is just routers - that need a modem in front of them to connect to the internet, etc.
Even makers use the wrong terms I have seen where they call their gateway device a modem or router, etc. When its actually a gateway device that has modem and router functions in 1 box..
Well, officially, it's a gateway. But I use it as a modem, with the gateway functions disabled.
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