Router vs. Modem: Which One Should You Reboot (and in What Order)?
They sit next to each other and look almost identical, so people reboot the wrong one all the time. How to tell your router from your modem — and the power-on order that actually matters.
By Byron Johnson — Founder of Johnson Creative & engineer behind Keep Connect
Written by a networking hardware engineerUpdated July 2026
When your internet goes down, you’re told to “reboot your router.” But most homes have twoboxes with blinking lights, and they do completely different jobs. Reboot the wrong one — or bring them back in the wrong order — and you can end up more offline than when you started. Here’s how to tell them apart and do it right.
What each box actually does
The modem is your bridge to the outside world. It connects to your internet service provider through the cable, phone, or fiber line coming into your home and translates that signal into something your network can use. One job: get the internet into the building.
The router takes that single connection and shares it with all your devices — over Wi-Fi and Ethernet — and manages the traffic between them. One job: distribute the internet around your home.
Plenty of people have a combined modem-router(a “gateway”), usually the single unit an ISP rents you. If you’ve only got one box, this whole router-vs-modem question is moot — you just reboot the one device.
How to tell which is which
- Follow the cable from the wall. The box that the coax, phone, or fiber line from outside plugs into is your modem.
- Look for antennas and Wi-Fi. The box broadcasting your Wi-Fi (often with antennas, and the one your phone connects to) is the router.
- Count the ports. A modem usually has just one or two ports; a router has several LAN ports for wired devices.
- Check the labels. Modems typically show downstream / upstream / online lights; routers show Wi-Fi / WLAN and numbered LAN lights.
Which one should you reboot?
The honest answer: reboot both. Since they work as a chain — modem to router to your devices — power-cycling the pair together clears the most problems and avoids the guesswork of trying to diagnose which link is at fault. The trick is the order you bring them back.
The order that matters
- Unplug both the modem and the router from power. Wait a full 30 seconds.
- Plug the modem in first. It has to establish the connection to your ISP before anything can route through it. Wait ~2 minutes until its lights are solid and stable.
- Then plug the router in. Give it another ~2 minutes to boot and start broadcasting Wi-Fi.
Why this order? If you power the router up before the modem has a live connection, the router can come online without a valid internet link and fail to hand out working connections — leaving you to reboot the router again. Modem first, router second, every time. It’s the same sequence in our step-by-step reboot guide.
Quick reference
| Modem | Router | |
|---|---|---|
| Job | Brings the internet into your home | Shares it with your devices |
| Connects to | The ISP line from the wall | The modem, then your devices |
| Broadcasts Wi-Fi | No | Yes |
| Power back on | First | Second |
Do it once, or never again
Getting the order right by hand is easy enough when you’re standing there. The hard part is doing it at 2 a.m. when the connection drops and you’re asleep. An automatic rebooter like Keep Connect can power-cycle your router (and modem) in the correct order automatically, the moment it detects an outage — so you never have to remember which box comes back first. For the full manual walk-through, see how to reboot your router the right way.