Dorm WiFi Sharing: Bypassing Campus Network Restrictions

Preface

Dormitory broadband generally requires account login, which makes it impossible to directly use a router to share WiFi. This article will introduce how to bypass the campus network's "one account per person" restriction by configuring a router (using Asuswrt-Merlin firmware as an example).

Note: This tutorial is based on testing with Mobile Broadband (Pingfeng Campus). For other carriers, please refer to the idea and configure it yourself.

Screenshot

Preliminary Preparation

• Router (recommended models such as Newifi 3, K2P that can be flashed)
• Unbrickable Breed
• Asuswrt-Merlin firmware
• School's broadband account and password
• Network cable

Cost estimate: Approximately ￥150

Purchase advice: Can be purchased on platforms such as Taobao.

• If you have strong hands-on skills, you can buy a brand new, unopened device and flash it yourself.
• If you are not familiar with flashing, please purchase a device that has been flashed with Unbrickable Breed and Asuswrt-Merlin firmware, which is usually more worry-free.

Hint: This article does not include flashing tutorials, please search for relevant information yourself.

Preliminary Configuration and Router Usage

Important: If you find that you cannot connect to the Internet suddenly after using it normally for a period of time, your device may have been blacklisted. Solution: Enter the router backend → External Network (WAN) → scroll down to find MAC Address → click the + sign to modify your MAC address.

1. Unbind Device (Important)

First, connect to the school's official WiFi Wlan-edu. After connecting, ignore the pop-up authentication window.

Enter 192.168.210.100 in the browser address bar to enter the User Self-Service System.

Account: Student ID
Password: Last eight digits of your ID card (or your modified password)

After logging in, find and click Unbind All MAC Addresses. After completion, disconnect from Wlan-edu WiFi.

2. Connect the Router

1. Connect the router to power.
2. Use a network cable to connect the wall network port (usually a protruding port dedicated to mobile broadband) to the router's WAN port (usually a blue port).
3. After the router starts, connect to its WiFi (the default SSID is usually PDCN or PDCN 5G).

Default WiFi name: PDCN or PDCN 5G
Default password: 1234567890

Configuration Method

1. Log in to the Firmware Backend

After connecting to the router's WiFi, open your browser and enter 192.168.123.1 in the address bar (Asuswrt-Merlin firmware default backend address).

Enter the default username and password:

Account: admin
Password: admin

If you can't log in

1. Please try changing your browser (Chrome is recommended).
2. Please check that you are correctly connected to the router's WiFi.

2. VPN Configuration

After logging into the backend, find and click External Network (WAN) in the left menu.

On the External Network (WAN) settings page, configure as follows:

1. WAN Connection Type: Select L2TP
2. VPN Server: 192.168.113.1 (Pingfeng Campus, please check for other campuses)
3. Username: hzxhaXXXXXXX (Pingfeng campus defaults to hzxha + last eight digits of your phone number)
4. Password: XXXXXX (Pingfeng campus defaults to the last six digits of your phone number)

To prevent detection by the carrier (not necessarily effective), you can make the following settings:

• Find the Do not decrease TTL option and change it to for all packets.

Click Apply at the bottom of the page to save the configuration.

3. Log in to the Campus Network

After saving the settings, wait a moment. Open any web page, and theoretically it will automatically redirect to the campus network login page.

Hint: If it does not automatically redirect, please manually enter 192.168.210.111 in the browser.

Enter your account and password:

Account: Student ID
Password: Last eight digits of your ID card (or your modified password)

After logging in successfully, you can share the network through the router.

Information Summary

1. User Self-Service System (for unbinding)

• Address: 192.168.210.100
• Account: Student ID
• Password: Last eight digits of your ID card

2. Campus Network Login Page (for connecting to the network)

• Address: 192.168.210.111
• Account: Student ID
• Password: Last eight digits of your ID card

3. Router Backend (for configuration)

• Address: 192.168.123.1
• Account: admin
• Password: admin

The article may contain errors, and corrections are welcome.