You can connect to the internet using the modem alone or the modem router combination device. Connect your router to your modem.

How To Setup Netgear Wireless Router Without Modem Router
How to connect wireless router without modem. Wireless router setup without modem the wndr3400 can serve as a repeater but only the main network has security turned off. To do so you will need to connect your broadband modem to the router. Connect the router and the modem with an ethernet cable. Connect an ethernet cable to the ethernet port on your modem. A second router that doesnt have wireless capability must be connected to the first router with an ethernet cable. Using a standalone modem and router.
Plug one end of the cable into the new routers uplink port sometimes labeled wan or internet. Reset the second router to factory settings and connect it to the main router via ethernet cable. Make sure to note your passwords and security mode wpa2 wpa or wep. Connect your modem to the wall outlet you get your internet through. How to connect a router to a modem. Routers and wireless routers enable you to share your broadband internet connection with multiple devices.
Herere some very good reasons why you should use a separate router and modem. Plug the other end into any free port on the first router other than its uplink port. Select wireless settings and write down the channel wireless mode and the ssid. However the ultimate way of utilizing your isp provided internet connection is by using a standalone modem and router. Connect an ac adapter to your modem and plug it in. Connect the other end of the ethernet cable to the wan port on your.
At this point you can proceed to configure the second router. A router that supports wisp operation able to use wifi as an internet port might be better suited to what you have in mind. Connect a second wireless router. For best results place your router near your modem.