model R6400V2 wireless router cannot connect

bearcat22
Aspirant
Oct 15, 2021
You wrote:

Formatting can cause problems and with your long novel anything could happen.

Your ISP modem has a built in router and wifi. This would be a double NAT condition which isn't recommended for use with a external router like the R6400.
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the NG router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the NG router gets from the modem.
3. Or disable all wifi radios on the modem and connect the NG router to the modem, LAN to LAN configure AP mode on the NG router.
You may want to compare the R6400 to your ISP modem router and see if the R series router is really needed?

My response:

Thank you for your reply, it is appreciated.
I do not understand your reference to "formatting". To me, that is a term applied to setting up a hard drive. I also don't understand what you mean by the phrase "your long novel".

Hopefull this was not meant as an insult towards my effort to save time by providing as much detail about the problem up front, to avoid wasted time with back and forth questioning.

Most of your suggestions I do not have the skill or knowledge to follow, but I will make an attempt, and report back here.
- bearcat22
  Aspirant
  Oct 16, 2021
  I don't know how to do any of the things you suggest, and the links lead to pages that are totally confusing.
  - michaelkenward
    Guru - Experienced User
    Oct 16, 2021
    bearcat22 wrote:
    
    I don't know how to do any of the things you suggest, and the links lead to pages that are totally confusing.
    
    The confusion starts on your first very long message.
    
    For example, it says:
    
    "when originally purchased, I believed the computer had a wifi router built in.
    
    It certainly has antennas sticking out of the back of it."
    
    Computers do't have routers built in. The antennae sticking out of the back are probabky for the PC to make a wifi connection to your router. How you do that is down to understanding how Windows connects to a network.
    
    Most of your first message has nothing to do with your network.
    
    You refer to "screenshots". I see none.
    
    Get back to basics. What matters is the stuff on your network and hows you set it up.
    
    You say you have a ARRIS SURFboard SBG10. That is a cable modem/router.
    
    If you add to this the R6400v2.
    
    This means that you have got two routers on your network.
    
    Two routers on your network can cause headaches. For example, you can end up with local address problems. Among other things, the other router can misdirect addresses that the Netgear router usually handles, such as routerlogin.net or the usual IP address for a router, 192.168.1.1.
    
    This explains some of the other drawbacks.
    
    What is Double NAT? | Answer | NETGEAR Support
    
    It may be possible to put the modem/router into modem only (bridge) mode and then to use the second device as the router.
    
    General FAQs: SBG10: Bridge Mode Setup – undefined
    
    Sometimes it is easier to put the second router into AP mode. But that has its own drawbacks:
    
    Disabled Features on the Router when set to AP Mode | Answer | NETGEAR Support
    
    All of this really just repeats the advice that FURRYe38 has offered. There really isn't much more to say. I have just added a few extra details and tried to simplify the format to make it easier to read.
    
    Sadly, you may have to do a bit of homework if you want to get around your confusion.

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model R6400V2 wireless router cannot connect