Why is the Debian R4 system unable to access the Internet when China Telecom is installed?

Why is the Debian R4 system unable to access the Internet when China Telecom is installed? -- Linux general technology-Linux technology and application information. For details, refer to the following section. I re-installed China Telecom broadband after tietong broadband expired the day before yesterday.
Problem:
In the Debian 4.0r4 system, dial-up access is not allowed (Windows XP system is normal ).
In the past, iron broadband was no problem whether it was a single dial-up Internet access or shared Internet access through a vro.

Google once said that China Telecom prohibits Internet access through routing and adds a new password to the Internet account and password. In this way, if you use a third-party dialing software or use a router to access the Internet, the connection will fail, I wonder if you have any suggestions?
If you cannot access the Internet in the Debian 4.0r4 system, nothing can be done.