One Ethernet cable can fix a weak mesh Wi-Fi connection

If Wi-Fi keeps dropping in part of your home even with a mesh system, the fix may be one Ethernet cable. A recent How-To Geek piece by Sydney Butler says wiring just one mesh box to another can get around walls and floors that block wireless signals. It also costs far less than buying another box.

Why walls still cause trouble

Wi-Fi uses radio waves, and radio waves are affected by what they pass through. A thin drywall wall is easier to get through than thick brick. A wall full of metal wiring and piping is harder to get through than one that is mostly empty.

The type of signal matters too. The 2.4GHz band reaches far and passes through walls well, but it is slower. The newer 5GHz and 6GHz bands are faster, but they lose more strength going through walls.

Where mesh systems fall short

Mesh boxes, called nodes, talk to each other over a link known as the backhaul. In many systems that link is wireless. To be fast enough, it also uses a high-frequency signal, so walls can weaken it just as they weaken your phone's connection.

Some systems have a dedicated radio for this link. Others share the same bands your devices use.

The cable fix

Most mesh nodes have Ethernet ports. Many people use them to plug in a desktop PC, but they can also link the nodes themselves. This is called wired backhaul. One example from the article: run a cable from the main node on the first floor to a node upstairs. That upstairs node can then feed other nodes on that floor wirelessly.

Not every node needs a cable. Some can be wired while others stay wireless, and the setup still works.

What to do

• Place a node at the edge of the dead zone, not in the middle, so it still gets a good signal from the next node.
• Keep line of sight between nodes, or as few obstructions as possible.
• Test the main node first, the one connected to your internet gateway.

That last check matters. If the main node's Wi-Fi is just as slow as a distant one, the article says the problem is likely something else entirely, and a cable between nodes will not solve it.