Client Isolation

What is client isolation?

Client isolation is a network setting that prevents devices connected to the same WiFi network from talking to each other. Normally, any device on your network can reach any other device; your laptop can see your printer, your phone can talk to your smart TV, and so on. Client isolation blocks this lateral communication so each device can only reach the internet, not its neighbors.

Think of it like cubicles in an office. Without isolation, everyone is in an open room and can walk up to anyone else's desk. With isolation, each person is in their own booth and can only communicate through the front door (the internet).

Why it matters

On your main home network, you probably want devices to talk to each other; that is how your laptop finds your printer and your phone controls your smart speaker. But on a guest network or an IoT network, isolation is important for security.

Without isolation on a guest network, a visitor's infected laptop could scan and attack your other devices. On an IoT network, a compromised smart bulb or cheap security camera could be used as a foothold to reach more valuable devices. Client isolation contains each device in its own bubble, so even if one device is compromised, it cannot spread to others on the same network.

What you can do

• Enable client isolation on your guest WiFi network; most routers have this option in the wireless settings, sometimes called "AP isolation" or "station isolation"
• Create a separate network (VLAN or SSID) for IoT devices and enable isolation on that network too
• Do not enable isolation on your main network if you need local services like printers, file sharing, or Chromecast
• On UniFi equipment, look for "Client Device Isolation" in the network or WiFi settings
• On consumer routers, check the guest network settings for an "isolate clients" or "AP isolation" toggle
• If you use a mesh WiFi system, check whether it supports isolation; some consumer mesh systems do not expose this setting

What Network Weather shows you

Network Weather checks whether client isolation is enabled on networks where it should be, such as guest WiFi and IoT networks, and warns you if devices on those networks can communicate with each other.