Restarting a Home Network in the Right Order

Why this matters

"Unplug it and plug it back in" fixes a lot of home network trouble, and done in the wrong order it fixes it halfway. Restart the router before the modem has its connection and the router can sit for an hour thinking the internet is down. Restart a device before the router is handing out addresses and the device can give up and wait for a long time before trying again. The customer sees two devices back and three still offline, and concludes the three are broken.

There is a right order, it takes 15 to 20 minutes, and every step in it exists because the box downstream depends on the one upstream being fully up before it starts asking.

The chain, and what each link waits for

STREET
  |
MODEM or ONT ...... wait: online light solid
  |                 (2 to 5 min)
ROUTER ............ wait: internet light solid
  |                 (1 to 3 min)
MAIN MESH NODE .... (often IS the router)
  |
SATELLITE NODES ... wait: each shows linked
  |                 (2 to 3 min each, in
  |                  parallel is fine)
DEVICES ........... rejoin on their own;
                    power-cycle stragglers

The rule the diagram encodes: bring the network up from the street inward, and do not start a link until the one above it says it is ready. The wait times are a common starting point; watch the lights, not the clock, because a modem on a noisy line can take longer and a fast one less. What each light is called and what color means "ready" varies by model, so check the manual or the provider's support page for the unit in front of you.

Before you touch anything: ask, and check what else rides on the network

A restart drops the whole house off the internet for 10 to 20 minutes. Ask the customer first, and ask specifically:

• is anyone working from home or on a call right now;
• is there an alarm system or medical monitoring device that reports over the internet (some do, with cellular backup and some without; see related: Cellular Backup and Alarm Communicators);
• does anything else depend on it that they would miss.

Why: a restart is harmless to the equipment and not always harmless to the household. A security system that loses its path to the monitoring center for 15 minutes without the customer knowing is a real gap, and the customer should hear about it before it happens, not after.

Restarting someone's network is also touching their equipment. Get the yes; if the gateway belongs to the provider, it is still the customer's call to restart it, but anything beyond a power cycle (settings, resets) goes through the shop's authorization step. See related: The Customer Network Change Authorization SOP.

Step 1: Find every box in the chain before unplugging any

Walk the chain and locate the modem (or ONT on fiber), the router, and every mesh node. In many homes the modem and router are one gateway unit. Note which lights are on and what color, and photograph them with your phone.

Why first: you cannot restart in order what you have not found, and a mesh satellite in a bedroom closet that you missed will come up out of sequence on its own schedule. The photo is your "before" state. If something is worse after the restart, it tells you what normal looked like.

What breaks if skipped: you restart the gateway, everything except the far end of the house comes back, and the satellite you never found is still linked to nothing.

Step 2: Power everything in the chain off, router side first

Unplug the satellites, then the router, then the modem. Leave them all off for 30 seconds.

Why this order for shutdown: it is the reverse of startup, and it means nothing downstream is left running and hammering a modem that is not there. The 30 seconds lets the power supplies drain so the units truly restart instead of flickering.

Use the power button or the plug, never the reset pinhole. A recessed reset button held for several seconds factory-resets most routers, wiping the network name and password, which takes every device in the house offline until each one is set up again. A restart is a power interruption, nothing more.

On fiber: many ONTs run from a power supply with a backup battery. Unplugging the ONT's adapter from the wall may not turn the ONT off, because the battery takes over. Most of the time the ONT does not need restarting at all; restart the router and leave the ONT alone unless the provider asks. Never disconnect the fiber itself from the ONT, and never look into the fiber end or the port, because the light in it can be invisible and can injure an eye (IEC 60825-2 covers optical fiber safety).

Hazard, reaching the boxes: gateways live on closet shelves and nodes sit high on bookcases. Use a stepladder, not a chair, and do not pull a unit off a high shelf by its cables. If a unit is plugged into a power strip behind furniture with water nearby (a fish tank, a wet bar, a basement with standing water), unplug at a dry outlet you can reach without standing in water, or leave it and ask the customer to move the unit.

Step 3: Start the modem and wait for its online light

Plug in the modem (or restore the ONT, if it was restarted). Wait until its online or internet light is solid in its normal color, typically 2 to 5 minutes.

Why wait for the light, not the power light: the power light comes on in seconds. The online light means the modem has finished talking to the provider and has a connection to hand on. A router started before that moment asks for a connection, gets nothing, and depending on the model may wait a long time before asking again.

What breaks if skipped: the classic half-restart, where the router shows "no internet" for an hour after everything looks plugged in.

Stop rule: if the online light does not go solid within about 10 minutes, the fault is upstream of the house. Stop restarting things. Have the customer check the provider's outage page on cellular data, and route it to the provider. See related: ISP Equipment and Where the Problem Actually Is.

Step 4: Start the router and wait for its internet light

Plug in the router. Wait for its internet or WAN indicator to show connected, typically 1 to 3 minutes. If the router is part of a gateway, Step 3 and Step 4 happen together and you just wait for the gateway's internet light.

Why: the router is what hands every device in the house its address. Devices that wake up before the router is ready get no address, and some back off and retry slowly for a long time. Check it the reliable way: a phone on the home Wi-Fi with cellular data turned off should load a web page. If it does, the internet and the router are both up.

Step 5: Start the satellite nodes and wait for each to link

Plug in each mesh satellite. These can come up at the same time. Wait for each to show it has linked to the main unit, usually a light changing to solid or the mesh app listing it as online, typically 2 to 3 minutes.

Why after the router: a satellite is useless until it finds the main node. Started first, it searches, fails, and may sit in a fallback state.

Step 6: Let devices rejoin on their own, then power-cycle only the stragglers

Give the connected devices 5 minutes. Most rejoin without help. Then check each one in its app.

For any still offline, restart that device only. Plug-in devices restart at the plug. Hardwired devices (a thermostat, a water shutoff hub on a dedicated circuit, an irrigation controller wired in) restart at their own power switch if they have one, or at the breaker. Before switching a breaker off, find out what else it feeds: a freezer, a sump pump, a well pump or a medical device on the same circuit should not lose power without the customer agreeing, and a sump pump in particular should not be off during rain. Switch the breaker with the panel cover on, standing to the side, and confirm the device restarted rather than assuming it.

Why stragglers only: restarting every device wastes time and risks losing settings on the few that store them only in memory.

Worked example: after the thunderstorm

A customer called the morning after a storm with a brief power flicker. The thermostat, the water shutoff hub and the irrigation controller showed offline; the doorbell and two smart plugs were fine.

The flicker had restarted everything at once. The router finished booting before the cable modem regained its connection, so the router came up with no internet and was sitting there. Devices that happened to start late had found the router's Wi-Fi and gotten addresses; the ones that came up early had gotten nothing and backed off.

The tech asked first: nobody was working from home, and the alarm system had cellular backup. The customer said yes.

• Step 1, 3 minutes: no gateway here, a separate modem and router in the office closet, one satellite node upstairs. Photo of the lights: modem online light solid, router internet light amber.
• Step 2, 1 minute: satellite, router, modem unplugged; 30 seconds off.
• Step 3, 4 minutes: modem online light solid at about the 4-minute mark.
• Step 4, 2 minutes: router internet light solid; the customer's phone with cellular off loaded a page.
• Step 5, 2 minutes: satellite linked.
• Step 6, 5 minutes of waiting, then checks: the thermostat and the shutoff hub had rejoined on their own. The irrigation controller had not. It was hardwired on a garage circuit that also fed the chest freezer; the tech told the customer, switched it off for 30 seconds and back on with the panel cover on, and it rejoined in 2 minutes.

Total: 3 + 1 + 4 + 2 + 2 + 5 + 2 = 19 minutes. Three of three offline devices back, confirmed in their apps from the customer's phone on cellular data, so the check proved the devices reached the internet and not only the router. The router's amber light in the "before" photo is what told the tech the problem had been the boot race and not the devices.

What would have changed the plan: if the modem's online light had not gone solid in Step 3, the storm had likely damaged something on the provider's side or the modem itself. No amount of restarting downstream would help, and the stop rule in Step 3 hands it to the provider.

Checking you got it right

Two tests, both from the customer's phone with cellular data turned off: a web page loads, and every connected device on the record shows online in its app. Then turn cellular back on, and check one device's remote control from outside the house's Wi-Fi if the customer relies on remote access. If the same restart is needed again within a week, the restart is not the fix; something in the chain is failing and the four-question location sequence in the ISP equipment sibling is the next move.

References

• See related: ISP Equipment and Where the Problem Actually Is
• See related: The Customer Network Change Authorization SOP
• See related: Cellular Backup and Alarm Communicators
• See related: Mesh Systems, Extenders and Dead Zones
• IEC 60825-2, safety of optical fiber communication systems (never view a live fiber end or port)