The basic connection: what goes where
Your modem receives internet from your provider. Your router takes that signal and broadcasts it wirelessly to your devices. To connect them, you need one ethernet cable running from the modem's "internet out" port (sometimes labeled "WAN" or "uplink") to the router's "internet in" port (also called "WAN").
The modem and router are separate devices for a reason: the modem handles the provider's signal, and the router handles your home network. Keeping them separate makes it easier to restart one without losing the other, and it gives you more control over who can see your devices.
Before you plug anything in, make sure both devices are powered off. This takes 30 seconds and prevents connection errors that can be annoying to troubleshoot later.
Key Takeaways
- Use one ethernet cable to connect the modem's internet port to the router's WAN port, then power both devices on and wait three to five minutes for them to fully start.
- The router's other ethernet ports are for wired devices like computers or printers; wireless devices connect through the router's Wi-Fi network name and password.
- If the router shows no internet light after five minutes, restart the modem first, wait two minutes, then restart the router.
- Changing your router's default Wi-Fi password from the one printed on the back is the single most important security step you can take right now.
- Your modem and router should sit in a central, elevated location away from metal objects and thick walls to reach all parts of your home.
Physical setup: placement and cable routing
Where you place these devices matters more than most people think. Put both the modem and router in a central location — ideally in a hallway or living room rather than a closet or corner. Elevation helps: a shelf or wall mount works better than the floor. Avoid placing them inside cabinets, behind televisions, or near microwave ovens, which can interfere with the wireless signal.
Run the ethernet cable directly from the modem to the router without coiling it tightly or running it alongside power cables. If the cable must cross a power line, do it at a right angle rather than running parallel. This reduces electrical interference.
If your modem and router are far apart, you may need a longer ethernet cable. Standard ethernet cables work at any length up to 100 meters, so distance is not a constraint. Avoid cheap cables with loose connectors; they can drop your connection intermittently.
Powering on and waiting for lights
Turn on the modem first and wait two full minutes before turning on the router. The modem needs time to connect to your provider's network before the router can use that connection.
Once both are powered on, watch the lights on the front of each device. On the modem, you should see a "power" light come on when ready, then a "downstream" or "online" light within 30 to 60 seconds. On the router, the power light comes on right away, and the internet or WAN light should turn on within two to three minutes. If the router's internet light never comes on, the cable connection is either loose or plugged into the wrong port.
Wait a full five minutes before assuming something is wrong. Modems and routers take time to negotiate with each other and with your provider's network. Restarting them too quickly can interrupt this process.
Checking the connection on your devices
Once the lights stabilize, open a web browser on any device connected to the router's Wi-Fi network and try to load a website. If a page loads, the connection is working. If you see an error or a login page, the router may not have received the internet signal yet — wait another minute and try again.
If the page still does not load, check that your device is actually connected to the router's Wi-Fi network, not to a neighbor's network or a saved network from before. On phones and computers, look for the router's network name (printed on a sticker on the router itself) in the available Wi-Fi list, and make sure you are connected to it.
If you are connected to the right network but still have no internet, restart the modem by unplugging it for 30 seconds, plugging it back in, and waiting two minutes. Then restart the router the same way. This clears temporary errors that prevent the devices from talking to each other.
Changing the router's default Wi-Fi password
The Wi-Fi network name and password printed on the back of your router are the same for thousands of identical routers. Anyone who knows the model number can look them up online. Change the password when ready after the connection works.
Open a web browser and go to the router's admin page — usually 192.168.1.1 or 192.168.0.1, printed on the router's sticker. Log in with the default username and password (also on the sticker). Look for a section called "Wi-Fi", "Wireless", or "Network Settings". Change the Wi-Fi password to something you choose, at least 12 characters long, mixing uppercase, lowercase, numbers, and symbols.
Write down the new password somewhere safe, or use a password manager to store it. You will need it to connect new devices to your network later. Once you save the change, the router will restart and your devices will disconnect. Reconnect them using the new password.
Ethernet ports and wired connections
Your router has multiple ethernet ports on the back. One is the WAN (internet in) port, which connects to the modem. The others are LAN (local area network) ports for wired devices in your home.
If you have a computer, printer, or gaming console near the router, plug it directly into one of the LAN ports with an ethernet cable. Wired connections are faster and more stable than Wi-Fi, and they do not broadcast a signal that others can intercept. This is especially useful for devices that handle sensitive information or need consistent speed.
You can use as many LAN ports as the router has. Most home routers have four. If you need more wired connections, you can add a network switch — a small device that plugs into one LAN port and gives you four or eight more.
Troubleshooting a connection that keeps dropping
If your internet works for a while and then stops, the problem is usually one of three things: the ethernet cable is loose, the modem needs a restart, or the router needs a restart.
First, check that the ethernet cable is fully inserted into both the modem and the router. Push it in until you hear a click. If it is already tight, unplug it, wait five seconds, and plug it back in. This resets the connection without restarting either device.
If the connection still drops, restart the modem by unplugging it for 30 seconds. If that does not fix it, restart the router the same way. If the problem continues after both restarts, the cable itself may be damaged — try a different ethernet cable if you have one available.
If the connection drops only when you are far from the router, the issue is Wi-Fi signal strength, not the modem-to-router connection. Move closer to the router or consider adding a Wi-Fi extender or mesh system to reach farther parts of your home.
Frequently Asked Questions
Can I use Wi-Fi instead of an ethernet cable between the modem and router?
No. Modems and routers must be connected with an ethernet cable. Wi-Fi is not reliable enough for this critical link, and it would create a circular connection problem. Use a cable, even if it means running it through walls or along baseboards.
What if my modem and router are in different rooms?
You will need a longer ethernet cable, which you can buy at any electronics store or online. Standard ethernet cables work reliably up to 100 meters. If the distance is longer than that, or if running a cable is impossible, you may need a powerline adapter or mesh Wi-Fi system, but the direct cable connection is always the most find and stable option.
Do I need to restart my modem and router regularly?
Not unless you have connection problems. Most modems and routers can run for months without a restart. If your connection becomes slow or drops frequently, a restart often fixes it. Unplug the modem, wait 30 seconds, plug it back in, wait two minutes, then do the same for the router.
What do all the lights on the modem and router mean?
Power light means the device is on. Online or internet light means the modem is connected to your provider, or the router is connected to the modem. Activity lights blink when data is being sent or received. If the online light is off, the connection is broken — check the ethernet cable and restart both devices.
Is it safe to leave the default Wi-Fi password unchanged?
No. The default password is public information. Anyone nearby with the router model number can find it online and connect to your network without your knowledge. Change it to a strong password unique to your home within the first hour of setup.