Using the second router as a range extender helps expand coverage.
Using the second router as a range extender helps expand coverage.
You should search for available operating modes on your router. It might be listed as Range Extender, Wireless Bridge with Access Point, or similar. If such modes exist, simply enter your current WiFi network name and password to connect, broadcasting either another network or the existing one. If those settings aren’t available, verify compatibility with DD-WRT. When supported, install DD-WRT and configure it. For more details, see the DD-WRT wiki on supported devices. If not, consider setting it up as an access point by connecting via cable to the router. Disable DHCP, NAT, and QoS, then connect to a LAN port for basic functionality.
Keep in mind that it's wiser to configure it as a second access point connected directly to the router. Unless it uses a different channel, it will cut in half the network bandwidth. If your router allows disabling DHCP, you should be able to do so, but verify its IP doesn't clash with your primary network. Preferably assign a static IP outside the main DHCP range—this gives you control if DHCP isn't available or if neither option works. Usually, access points operate in bridge mode, so their IP doesn't need to match the main network; they simply forward traffic regardless of their address.