If you prefer using a computer, you can use the router's web-based interface.
This usually means your guest network is stuck on 2.4 GHz interference.
Tap on the Toolbox or Network Settings tab at the bottom of the screen.
: Launch the Mi Home or Mi Wi-Fi app and select your AX1800 router. Go to Toolbox : Tap on Toolbox or More Tools at the bottom. Select Guest Wi-Fi : Tap the Guest Wi-Fi icon. create guest network on xiaomi mi router ax1800 fixed
| Setting | Recommended Value | Why? | | :--- | :--- | :--- | | | YourName_Guest | Do not hide SSID (hidden networks cause reconnection failures on Xiaomi) | | Band | 2.4 GHz Only | Avoids the 5GHz driver crash bug on AX1800 | | Security | WPA2-PSK | WPA3 on guest network breaks many legacy client devices | | Guest DNS | 8.8.8.8 / 1.1.1.1 | Bypasses the router’s internal DNS cache bug | | Speed Limit | 10 Mbps up/down | Prevents guests from saturating your 1Gbps fiber line | | Access Local | OFF | Security (Turn ON only if you have a guest printer) | | Access Each Other | OFF | Prevents infected guest devices from spreading malware | | Validity | No expiry | If you set a time limit, the AX1800 sometimes fails to auto-renew |
What do you see if the connection fails?
A: In standard AP mode, the router's built-in guest network feature usually becomes disabled. To maintain guest isolation in AP mode, you would need to use advanced features like VLANs from your main router, which is a more complex setup. If you prefer using a computer, you can
If none of the above works, your router is likely running the which has a completely broken guest network stack.
The AX1800 sometimes fails to route Guest VLAN traffic to the WAN DNS. It tries to use the router’s own internal DNS (127.0.0.1), which guests cannot access.
: Launch the Mi Home or Mi WiFi app and ensure you are logged into your account. : Launch the Mi Home or Mi Wi-Fi
The guest network should now be active and ready for your visitors.
This is the most direct way to access full router settings from a computer or mobile browser. Access the Admin Panel : Open a web browser and navigate to 192.168.31.1 miwifi.com