Dorm WiFi Sharing: Bypassing the Campus Network Limit

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 break through the campus network's "one account per person" restriction by configuring a router (taking 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 ideas and configure it yourself.

Screenshots

Preliminary Preparation

• Router (Recommended Newifi 3, K2P and other flashable models)
• Unbrickable Breed
• Asuswrt-Merlin firmware
• School broadband account and password
• Network cable

Cost Estimation: Approximately ￥150

Purchase Suggestions: 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 already 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 related information yourself.

Preliminary Configuration and Router Usage

Important: If you find that you suddenly cannot connect to the Internet 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 authentication window that pops up.

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 the password you changed)

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

2. Connect Router

1. Power on the router.
2. Connect the wall network port (usually a prominent port dedicated to mobile broadband) to the router's WAN port (usually a blue port) with a network cable.
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 a browser and enter in the address bar: 192.168.123.1 (default backend address for Asuswrt-Merlin firmware).

Enter the default account password:

Account: admin
Password: admin

If you cannot log in

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

2. VPN Configuration

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

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

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 the mobile phone)
4. Password: XXXXXX (Pingfeng Campus defaults to the last six digits of the mobile phone number)

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

• Find the Do not decrease TTL for routed packets option and change it to 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 webpage and it should automatically redirect to the Campus Network Login Page.

Hint: If you are not automatically redirected, 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 the password you changed)

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, corrections are welcome.