Beautiful colleague DL-624 + a Home Office Wireless routing solution!

DL-624 + A cannot get WAN connection solution:
Symptom: 1
My colleague asked me to help her configure the wireless network in the house. the hardware devices are: DL-624 + a wireless router with homeaccess cat. monthly Telecom broadband Internet access, set according to instructions, all indicators are displayed OK, wireless can also be connected, but is unable to obtain WAN connection, D-link system information always prompts pppoe offline.

Possible problems and solutions:
1. China Telecom blocked the Internet sharing service ??? ---> Call China Telecom. However, this situation is almost impossible.
. Conflicts with other software ??? --> Delete the dialing software used in the system to connect to the original dialing.
. China Telecom dialing is related to binding (or limiting) MAC numbers. --> Call China Telecom to ask.
. Hardware driver question :??? --> Update the firmware driver of D-link as follows:
Http://www.dlink.com.cn/service/faq/faq_view.asp? Id = 429
Driver download:
Http://www.dlink.com.cn/service/downloads/downloads_view.asp? Id = 706 & type = % C2 % B7 % D3 % C9 % C6 % F7

I found a lot of information on the Internet, and discussed the D-link firmware most. So,
Symptom 2:
From the solution of symptom 1, we can see that even communication software can be used normally. however, it is very slow to open a webpage. I found the relevant information, presumably because of downloading tools such as Bt and Xunlei. but now I am not sure. therefore, you only need to perform another test tomorrow morning. the test result of the next day is consistent with the speculation last night. it proves that the download tool is indeed used.
Symptom 3:
The company also uses D-LINK DL-624 + A, but appear, sometimes the signal is very good, sometimes no signal. And often dropped symptoms.
Solution:
3.1: Driver problem --> Update the driver of the wireless Nic
3.2: When a LAN user performs a BT or PPLIVE or a P2P application such as thunder, the webpage cannot be opened normally. In severe cases, the network connection is disconnected and the router is disconnected. same as symptom 2.