Sixin F3X34/F3X24/F3X25/F3B3X Router Configuration Manual

About this manual

This manual explains how to access the router’s web interface, set up various WAN connection types (3G/4G, static IP, PPPoE), configure Wi‑Fi client mode, VPN services, NAT port forwarding, serial‑port applications and dynamic DNS. It also provides instructions for dual‑link operation, including Wi‑Fi primary with 3G backup and load‑balancing.

Each section includes step‑by‑step settings, example parameters and notes on online keep‑alive methods to ensure reliable connectivity. The guide is intended for technical staff and end‑users who need to customize the router for their network environment. This manual is written in Chinese.

What's inside

• Entering Router Configuration
• Internet Configuration
• Wi‑Fi Client Mode
• VPN Configuration
• NAT Port Forwarding
• Serial Port Application
• Dynamic DNS (DDNS)
• Dual‑Link Version (Wi‑Fi + 3G)
• Online Keep‑Alive Settings

Specifications

Frequently asked questions

How do I access the router’s web configuration page?

Connect a PC to the router’s LAN port, open a browser and enter the gateway address – 192.168.1.1 for F3X34 or 192.168.1.2 for F3X24.

How can I keep a 3G connection alive when there is no traffic?

Enable the online keep‑alive feature, choose the ping method, set a detection interval and a reachable server IP (e.g., 8.8.8.8). The router will periodically ping the server to stay online.

How do I configure dual‑link with Wi‑Fi as primary and 3G as backup?

Set the WAN connection type to Wi‑Fi client, configure the Wi‑Fi SSID and security to match the upstream AP, then enable the 3G backup link and choose an online‑keep method (e.g., ping) to switch automatically when Wi‑Fi fails.