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Comcast/Nighthawk IP assignment conflict?
Hi, I recently installed my new Nighthawk, I am impressed and it is working pretty well. But I have a Comcast ISP and they give you a router as part of the cable modem. That Router assigns 10.0....
AP Mode is not the default setting and I don't think the R7000 would have enabled it by itself. You may have been asked during initial setup whether you wanted to set it up as an AP.
In any case, now that we've established that AP Mode is enabled, the R7000 is not acting as a DHCP server. The R7000 will relay DHCP messages back and forth between attached clients and your Comcast router.
If you are not using the Comcast wireless network, then you should turn it off. It'll free up the wireless channel plus remove one thing for people to hack.
Yes, it could. You will want to change one of the routers to use a different subnet. The Nighthawk can normally detect the WAN subnet and adjust the LAN subnet to avoid the conflict, but it appears that this didn't work. You could adjust the Nighthawk to use 192.168.1.X/255.255.255.0.
I appreciate both of your replies and they are guiding my thinking in this matter. But I wish to be a little contrary now. I am looking at the comcast admin attached devices and the nighthawk admin attached devices and somehow they both seem to be able to see devices that are attached to the other router (my nighthawk can see the computers i have ethernet wire connected to the comcast router, which in my mind would be the "blind spot" if there was one). So if they see those devices they can probably avoid assigning ip's on top of each other.
Double NAT is certainly a concern but it's unrelated to the question at hand of the same subnet being used on the Internet and LAN ports of a router. The latter is a no-no and will only lead to grief. I believe Flash7Gordon is either very lucky that an IP address collision hasn't happened or he has enabled AP Mode on the R7000. If he has enabled AP Mode, then everything is ok because the router and DHCP server functionality are disabled.
Flash7Gordon, do you have AP Mode enabled?
If AP Mode is disabled, then can you provide the IP address and subnet mask information from the Internet Setup AND the LAN Setup pages? I'm very doubtful that the R7000 would permit the same subnet on both ports.