I have a wired 2 port coda-45 cable modem that has a UI but there are no settings available for config, the ISP stuff all config settings over cable.
I can get internet access connecting LAN port from modem to my computer but I can't seem to get wifi access when connecting some other routers that I have to this cable modem. The only thing I could get to work was a raspberry pi configured as a wifi hotspot with ethernet port connected to the cable modem.
Here's what I've tried: The unconfigurable cable modem gateway is on IP 192.168.100.1, I can't see from it's UI status page what the DHCP range is configured to.
I have configured some other wifi routers I have for test to be on the same subnet with DHCP disabled and have tried setting IP to 192.168.100.2 & 192.168.100.253 as I think the address needs to be set to something outside the main cable modems DHCP range but I can't get internet access when connected to the wifi router.
Maybe this means the DHCP range on the cable modem covers all available IP's on subnet 100, I'm not sure.
I also have Netgear GS108E switch and tried setting up 2 x VLANS, one for the the cable modem and the rest for end devices and wifi router but I can't get internet access here either. For this test I re-enabled DHCP in my wireless router which is on 192.168.0 subnet. I'm not so confident I have configured the VLANS correctly though.
I'm not sure what else to try. In theory should I be able to use my switch to bridge 2x subnets with DHCP enabled on both?
Any pointers here is greatly appreciated!