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Restrict DHCP?
Hello Everyone, Thanks for taking the time to read this. I've got a Netgear Orbi Mesh router with one sattelite. Everything was fine until 3 days ago when the cable modem I own was replac...
OK, first off, you don't have to be a **bleep**. You made a short answer, being "no, you can't" into this whole big long thing and have been throwing shade for most of your replies.
Second, I'm asking if this device will do something that many other devices do. Just because you don't like the question, doesn't make it the wrong one.
Third, I intentionally left off the make/model of the modem to minimize the "Have you tried doing this?" posts that I didn't want. As if I hadn't tried any of the things y'all would've said to log into the modem to try. The cable modem given to us from Altice One needs the DHCP on and the WiFi on for the DVR's to work. Period. Turning those functions off is not an option.
Lastly, I've managed to solve the issue by setting up VLANs on the Cisco switch so that the only devices getting an IP from the cable modem are the DVR devices.
You can reply if you like, but I'm done with this post, and most likely the community as well.
Good day.
StephenCG wrote:Ever since then, the Orbi is handing out IP addresses from the new cable modem instead of it's own range from DHCP.
Do you state the Orbi system does allow to "leak" a WAN/Internet side DHCP server (in your case the one on your new cable modem) randomly or always, instead from the one on the Orbi router LAN/WLAN side? I doubt somehow this is possible on such a consumer device. If yes, you can bring your iptables knowledge back in here.
Please provide us the IP subnet from your old cable modem (probably 192.168.0.0/24) and the IP subnet you had seen on on the on the Orbi system (probably the Orbi default 192.168.1.0/24) before.
And then to compare, provide us with the IP subnet in use by the new ISP provided modem/router/gateway, and the IP subnet on your Orbi router LAN/WLAN.
I suspect your new ISP supplied cable modem does run by default on the IP subnet partially or in all detected as overlapping with the IP subnet you had previously configured on the Orbi LAN/WLAN. Is it possible the Orbi has adopted the LAN subnet on it's own because it detected the same or a similar IP subnet overlap situation. Needless to say - routing would not work on the same or a partially overlapping IP subnet of course. And (not a secret): I've seen this isn't very reliable on the Netgear routers for certain non-standard environments.
The point is that Orbi does just retain the second half of the fixed DHCP table - the network part does change along with the Orbi local subnet.