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hpais's avatar
hpais
Follower
Mar 20, 2020

How to disable Cable Modem on C7800 Nighthawk X4S

Hi folks,

 

I recently switched cable providers, from Xfinitiy to WAVE. Upon connecting my X4S, I couldn't get anywhere the 1Gbit speed and Wave recommended to switch the cable modem to an Arris SB8200.

 

The question is: I want to keep using the wifi/Router portion of the X4S, but with the Modem being the Arris. How can I disable the modem portion of the c7800?

 

I do not see the option to turn off the Modem portion anywhere. Turning off NAT only makes the X4S completely dumb, disabling all Wi-fi functionality.

 

Thanks for any help.

1 Reply

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  • antinode's avatar
    antinode
    Guru
    Mar 20, 2020

    > [...] How can I disable the modem portion of the c7800?

     

       You can't.  A cable-TV-type modem+router model (Cxxxx) doesn't have
    an external WAN/Internet Ethernet port, so it has no place where you
    could connect an external modem.

     

    > [...] Turning off NAT only makes the X4S completely dumb, disabling
    > all Wi-fi functionality.

     

       I wouldn't expect disabling NAT to disable the wireless-network
    capability, but it would not leave you with a working router, either.
    Disabling the DHCP server wouldn't help, either.  You need more
    hardware, not less software.

     

       It's not a complete paperweight.  It should be possible to configure
    a C7800 as a wireless access point.  See, for example:

     

          https://community.netgear.com/t5/x/x/m-p/1463500

     

    But, again, that's not a router.