Setup C7000 as an Access Point?

[RafaelSMI]

I live in Brazil and here do not have internt cable in my city, i bought a modem router C7000 Nighthawk AC1900 and i need use this with as access point. How i do? Thanks

[TheEther]

The C7000 does not have an AP Mode setting, so you will have to set it up the old-fashioned way.

1. Connect a single computer to the C7000, preferably via Ethernet but Wi-Fi is ok.
2. Log in and configure the Wi-Fi settings to your preferences.  If you connected via Wi-Fi in #1, then your connection may drop if you change the Wi-Fi settings.  Just log in again.
3. Go to ADVANCED > Setup > LAN Setup.  Change the IP address so that it is in the same subnet but outside of the range of DHCP addresses managed by your main router.  For example, if your main router has IP address 192.168.1.1/255.255.255.0 and assigns DHCP addresses from 192.168.1.2 to 192.168.1.100, then use 192.168.1.101 for your C7000.  You may have to change the DHCP range in order to free up an address.  If you change the C7000's IP address, don't Apply the change until the next step.  Write down this address.  You will need it in the future to log into the C7000.
4. Disable the DHCP server on the C7000.  Click Apply.  Your computer's connection may drop at this point.  That's ok.  You are done configuring it.
5. Connect the C7000 to your main router via Ethernet.

That's it.  Enjoy your AP.  Your C7000 may report that the Internet is down.  You can ignore it.  It's merely reflecting the fact that it's cable modem interface is down.