XZ

Xiao Z's blog

Learn, build, share

Complete Guide to Getting IPv6 Address on China Telecom Broadband

get ipv6 addresschina telecom broadbandipv6 configurationtewa-500ebridge mode
Published·Modified·

IPv6 is an abbreviation for "Internet Protocol Version 6," the next-generation IP protocol designed by the Internet Engineering Task Force (IETF) to replace IPv4. Its address space is vast enough to assign an address to every grain of sand on Earth.

The biggest issue with IPv4 is the limited number of network addresses, which severely restricts the application and development of the Internet. The use of IPv6 not only solves the problem of insufficient network address resources but also removes obstacles for multiple access devices connecting to the Internet.

— Excerpt from Baidu Baike

Currently, some regions already support IPv6 addresses. You can consult your network operator (customer service may not know what IPv6 is) or search online. From testing, Chengdu Telecom mobile networks already support IPv6, but Chengdu Telecom broadband requires some effort. Xiaoz records and shares this process here. Methods for other regions are largely similar; this content is for reference only. If there are errors, please correct them.

Preparation

  • Call 10000 to change the broadband to bridge mode + public IP. This requires the router to perform PPPoE dialing. Do not attempt this if you do not know your broadband account and password.
  • Telecom Optical Modem (TEWA-500E).
  • Router (must support IPv6). Xiaoz uses the "ASUS RT-ACRH17" router, which supports IPv6 by default.

Obtaining the Optical Modem (TEWA-500E) Super Account

Method 1:

  1. Open a browser and visit http://192.168.1.1/. Log in with the modem's standard account and password (found on the bottom of the modem).
  2. Visit http://192.168.1.1/backupsettings.conf again to download the configuration file.
  3. Open the configuration file with a text editor, search for password to get the password string, and decrypt it using Base64 at http://tool.chinaz.com/Tools/Base64.aspx. The super administrator account is telecomadmin.

Method 2:

If the downloaded backupsettings.conf does not contain the password, your modem firmware may have been updated to a new version that fixes this vulnerability. You can try logging in via SSH to get the super password.

By default, SSH login is enabled on the modem. You can test port 22 on 192.168.1.1 using telnet.

  1. Use PuTTY to connect to 192.168.1.1 with the username admin and password admin. (Due to encryption protocol issues, Xshell may fail to connect; PuTTY is recommended here).
  2. Enter the command telecomadmin get to retrieve the modem's super password.

Configure the Optical Modem

Open the modem at http://192.168.1.1/ again and log in with the super administrator account telecomadmin and the password obtained in the previous step.

Navigate to Network > Network Settings. Change the Connection Name to the one containing "INTERNET" and set the IP Mode to "IPV4&IPV6". See the screenshot below.

Configure the Router

In the ASUS router backend, go to IPv6. Change the Connection Type to "Native" and the Interface to "PPP". Keep other settings as default and save. This completes the basic setup.

IPv6 Test

Wait a few minutes for the IPv6 address to be automatically obtained. Then visit https://test-ipv6.com/ to test. If the test passes, congratulations! Your local network now supports IPv6 access.

IPv6 DNS

  • 240c::6666
  • 240c::6644
  • 2001:da8::666 (USTC)

Some Notes

  1. Obtaining the modem super password (requires connecting via SSH using PuTTY; other tools may fail).
  2. Change to bridge mode and use the router for PPPoE dialing.
  3. The router must support IPv6.
  4. It is recommended to manually set IPv6 DNS on your computer (settings on the router may not take effect).

Related Articles

References

This article references the following works (ranked in no particular order):