DDNS in the Xiaomi router: how to work dynamic DNS and why you need it

Have you ever tried to connect to a home camera or file server from another network, but have encountered a problem: IP-Is your Xiaomi router’s address constantly changing? This is typical for most providers who assign dynamic routers. IP — They're cheaper for the operator, but they create headaches for users who need remote access. DDNS (Dynamic DNS), built-in firmware of Xiaomi routers (Mi Router series) 4A/4C/4Q/AX, Redmi Router, et al.).

In this article, we will explain what is DDNS Xiaomi router, how it solves the problem of changing IP, What services are supported (including Mi) DDNS, No-IP, DynDNS, and let's give you a step-by-step setup instruction via the MiWiFi app or web interface. DDNS-services and alternative ways of organizing remote access without "dancing with diamond".

What is DDNS and why you need it in the Xiaomi router

DDNS (Dynamic Domain Name System) is a service that automatically updates your DNS record by linking your dynamic IP to a permanent domain name. Simply put, instead of remembering or checking your current external router IP (e.g. 93.125.47.210), you use an easily memorable address like myhome.no-ip.org.

Why is this important for Xiaomi routers?

• 📌 Remote access to devices: Connect to Xiaomi Mi Home cameras, NAS-servers or home PCs via the Internet.
• 🔧 Outside router management: port setup, reboot or traffic monitoring without VPN.
• 🖥️ Hosting services: deploy a home web server, a game server (Minecraft, CS:GO) Or Nextcloud.
• 🔒 Bypassing locks: if the provider blocks ports, DDNS + Ports will help to organize a white port" IP.

Without DDNS, when you change your IP (which happens every 24 to 48 hours for most providers), all your port-over settings become useless – the external address has changed, and you can’t connect to your home network. DDNS solves this problem by constantly synchronizing the domain name with the current IP.

How DDNS works in Xiaomi firmware: technical details

Xiaomi routers (based on the firmware MiWiFi ROM or OpenWRT) support DDNS through an embedded client that interacts with external services via HTTP/HTTPS.

1. The router receives a new IP from the provider (e.g. after a reboot or expiration of the DHCP lease time).
2. Built-in DDNS-The client sends a request to the server (e.g., No-IP) by transmitting the current request. IP and authentication data.
3. The server updates the DNS record by linking a domain name (such as yourdomain.ddns.net) to the new IP.
4. All external connections to your domain are automatically redirected to the current IP.

It is important to understand that Xiaomi does not provide its own. DDNS-Service (as opposed to service) ASUS Instead, routers support popular third-party services:

Critical feature of Xiaomi routers: built-in DDNS-Client does not support encryption (HTTPS) Some services, which can be a problem when using public networks, also lacks Cloudflare support. DDNS DuckDNS – you will have to manually configure them through scripts.

Step-by-step setting up DDNS on Xiaomi router

Let's look at two ways to set up: through the MiWiFi app (mobile) and the web interface. Make sure you:

Registered account for DDNS-Service (e.g. No-IP)

The router is connected to the Internet and has an external IP (not grey)

Required ports are open in the section "Port forwarding"

Double NAT disabled (if there is a second router)

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Method 1: Configure via the MiWiFi application

1. Open the MiWiFi app and go to Settings → Additional → DDNS.
2. Turn on the DDNS switch and select a service from a list (e.g. No-IP).
3. Enter the login details: Host name: your domain name (e.g. myrouter.ddns.net). User name/password: credentials from DDNS-service.

Save.

Connected.

Method 2: Configure via web interface

1. Connect to your router at 192.168.31.1 (or miwifi.com).
2. Go to the Additional settings → Network → DDNS.
3. Select the service (e.g. 3322.org) and fill in the fields: Hostname: yourname.vicp.net User: your login Password: your password Update interval: 600 seconds (recommended)
4. Save the settings and check the status in the DDNS Status section.

If the status remains a connection error, check:

• 🔌 Correctness of the entered data (login / password / host).
• 🌐 Availability of service DDNS (No-IP can block requests from certain regions).
• 🔒 No port 80 or 443 locks by the provider.

💡

If your ISP uses CG-NAT (gray IP), DDNS will not work. Check the external IP on 2ip.ru - if it matches the address in the router's web interface (192.168.x.x), contact the ISP for white IP or use alternatives like Tailscale or ZeroTier.

Common mistakes and their solutions

Even after you set it up properly, DDNS may not work, and here are the typical problems and ways to fix them:

⚠️ Warning: If you use No-IP, remember to confirm your account every 30 days! otherwise the domain will be blocked and the connection will stop working.

Another common problem is delaying IP updates. By default, the router sends a request for an update every 10 minutes, but some services (such as No-IP) may ignore too frequent requests.

1. Increase the refresh interval to 3600 seconds (1 hour).
2. Use the script to force the update (via SSH or Task Scheduler).

DDNS alternatives for Xiaomi routers

If the built-in DDNS is not comfortable (for example, due to the limitations of free services), consider alternative ways to organize remote access:

• 🔗 VPN-Services: Tailscale or ZeroTier — create an encrypted network on top of the Internet without port port overflow. WireGuard — you can configure on a router with OpenWRT firmware.
• ☁️ Cloud services: Cloudflare Tunnel (free) - allows you to access local services without port rollover. Ngrok is paid, but easy to set up.
• 📡 P2P-Solutions: Syncthing for file synchronization. RustDesk for remote PC management.

The advantage of these methods is that they don't depend on external IP and port overlay, for example, Tailscale automatically creates a secure connection between devices, even if they are behind the NAT, and the disadvantage is that there are possible traffic restrictions or the need to install a client on all devices.

⚠️ Attention: Use of third-party VPN or P2P-Services may conflict with Mi Home settings or other Xiaomi devices on the local network. Before setting up, disable UPnP in the router to avoid unexpected port spills.

Security with DDNS on Xiaomi

Opening up your home network through DDNS is always a risk, and here are the key security measures:

1. Use complex passwords to DDNS-account and router. Avoid standard combinations like admin/admin.
2. Disable remote router management (Settings → Remote access) if you do not need it.
3. Set up firewall: Close all ports except those required (e.g. 80 for web server or 3389 for RDP) and use non-standard ports (e.g. 8080 instead of 80).

Fail2Ban

OpenWRT

Update your firmware regularly

If you need to connect to a router from the outside, you’d better use a VPN instead of directly opening the web interface. For example, OpenWRT firmware can configure OpenVPN or WireGuard, which is safer than port 80.

💡

Never open ports 22 (SSH) or 3389 (RDP) directly to the Internet without additional protection (e.g. Fail2Ban or two-factor authentication).

FAQ: Frequent questions about DDNS in Xiaomi routers