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Forum Discussion
C7000 Can not change LAN IP to 192.168.100.___
Hey All, So, I bought this REALLY nice C7000 Nighthawk cable modem router and I want to use it instead of the old cheap Comcast cable modem here. I have "upgraded" dozens and dozens of the ch...
Ummmmm ..... Darren ..... I am not even going to take the time to type out what is wrong with your post ..... I will however suggest that you take some basic computer network classes ..... sorry ..... but if you take the time to understand what you are actually doing when you type an I.P. (Internet Protocol) address into a web browser you will understand why you ended up at that page you mentioned AND you will understand what I am saying.
Good bye ..... "Live long and prosper"
Hi, I’ve just started taking some basic computing/networking classes and your post intrigued me. I sort of understand (but really don’t) what you are saying.
Two things pop into my mind. Firstly could you explain to me why you haven’t tried using IP addresses above .254 - maybe one of them would work for you?
It sure seems like if you have spent hours on this problem maybe it would have been quicker to pick IP addresses in a different range other than 192.168.100.___ ?
Hope you’ve found the answer to your problem!
Best wishes!
Two things pop into my mind. Firstly could you explain to me why you haven’t tried using IP addresses above .254 - maybe one of them would work for you?
It sure seems like if you have spent hours on this problem maybe it would have been quicker to pick IP addresses in a different range other than 192.168.100.___ ?
Hope you’ve found the answer to your problem!
Best wishes!
- To answer your question PFY....... That is because these type of cable modem/routers only have the ability to assign UP TO a total of 255 addresses which is standard for all these type of devices.
So here is the bottom line:
But the bigger issue is .... AND major drawback with at least this model Netgear cable modem/router (C7000) is that the engineers at Netgear decided to intentionally allocate ALL the addresses that start with the octet of 192.168.100.xxx to some other purpose which completely blocks them from being used at all by the end user.
It is a common practice for businesses to use 192.168.100.xxx as the IP octet for there static networks....... just like 192.168.1.xxx is usually used for Home based networks. This is not written in stone it just seems to be a common practice.... having supported hundreds of businesses over the years.
Other brand cable modem/routers do NOT design there devices so that 192.168.100.xxx are not available to the end user.I sold this really nice C7000 on Craigslist for just a small loss and purchased a Linksys model which allowed me to use it on this business domain which has ALL of its devices using static IP’s starting with 192.168.100.xxx.
Up until this point I REALLY, REALLY liked Netgear devices.... they always worked (ie no flaws out of the box), are VERY user friendly and most importantly very compatible with other network equipment.
But thanks to this recent design change by Netgear I am going to have to rethink my preferences when purchasing cable modem/routers.
Interestingly enough SEVERAL of the “experts” at Netgear that replied to my support request knew NOTHING of this limitation with there cable modem/routers. If you go back to the very beginning of my post here .... you will see just how many “experts” at Netgear replied to my post and suggested possible “fixes” for something that can not be changed because it was intentionally designed that way by the engineers at Netgear.
it is NOT a flaw. It is by design.
It is as per DOCSIS specification. Please review if you have time.
you have so many private subnets (as per RFC1918) to use and I am not sure why you are just stuck with 192.168.100.x. Also every "Cable Modem Router" should have the same design as well. you can purchase a non-NTGR modem and report back here if you see different behaviour.
**FROM DOCSIS 3.0 OSSI Spec**
The CM MUST support 192.168.100.1, as the well-known diagnostic IP address accessible only from the CMCI interfaces. The CM MUST support the well-known diagnostic IP address, 192.168.100.1, on all physical interfaces associated with the CMCI. **** you can download the specification from CableLabs website. It is free.
you could cross-reference this post on the DSLReports Forum where lot of esteemed Cable Community members post and they can provide you further details as well (https://www.dslreports.com/forum/comcast)
