So I recently moved into a new apartment, and the modem we received from Cox Communications was a Cisco DPQ3925. Unfortunately, I was not here when they set it up. It probably would not have mattered either way, but I would have at least requested a standard modem rather than a modem/router combination. I have my own router that I have configured with Tomato, tons of scripts and configured just the way I want. I thought it would be no problem to put their device in bridge mode. Yikes... I was certainly wrong. I went searching and found this post which explains that the option is there but hidden. The firmware version I have on mine must have corrected that, because it is no longer available. Sure, I can go pay for a new modem, but I would rather not. I called Cox and they said they only offer the combination boxes and of those there were only two models. I looked up the other one they mentioned and it also has no way to change the mode.
I would prefer not to double NAT. Could I just place the router in the combo's DMZ? Would that work fine? Thanks in advance.
Best Answer JJ_ , 14 January 2014 - 23:38
The problem is your router and gateways IPs are in a different subnet. Without making drastic changes to your routers settings, getting your gateway in the same subnet as your router should do the trick and changing the routers IP so it doesn't clash with the gateway. Change to below then if your Cisco gateway doesn't cycle power on saving settings, manually cycle it's power.
Finally change the DMZ host IP in Cisco gateway to 192.168.1.2Go to the full post