Dear ADSL users:
As we all know, ADSL cat (MODEM) has two working methods: bridging and routing. When the ADSL cat is set to bridge mode (the default setting method at factory), the user needs to dial PPPoE through the computer connected to the ADSL cat before surfing the Internet; when the ADSL cat is set to routing mode (the user can set it to this mode by himself), the user directly surfing the Internet through the built-in PPPoE dial-up function of the ADSL cat. At present, most ADSL users use ADSL cats to access the Internet by default, but some users set ADSL cats to access the Internet by themselves.
We found that some models of ADSL cats in some manufacturers have security risks when setting them as routing. For example: In March this year, some ADSL users reported that they often disconnected from the Internet. After our inspection, we found that some ADSL users set up ADSL cats to access the Internet by themselves, which was attacked by network hackers and viruses, resulting in frequent disconnection from the Internet. The reason is: When some models of ADSL cats are set to routing, there are certain defects, and their ability to defend against network hackers and virus attacks is poor, which causes ADSL cats' CPU and other resources to be exhausted, greatly reducing their performance, causing disconnection from the Internet.
Recently, we have found that when some models of ADSL cats are set as routing, some network criminals have launched network attacks against the security vulnerabilities of adsl cats. This network attack will only affect the adsl cats working in the router mode, which is commonly referred to as adsl cats’ built-in dialing (hard dialing) method, such as not being able to access the network; in addition, network hackers can also obtain the Internet account and password information set by ADSL users in the ADSL cat through illegal channels, and use this information to consume (such as purchasing Q coins, etc.), which has a great impact on the user's interests; while the soft dialing method of adsl cats working in the bridging method, that is, through PPPoE dialing software such as Guangdong Telecom's vnetclient, the soft dialing method has no impact.
In order to avoid attacks and protect the interests of ADSL users, we provide the following solutions:
1. It is strongly recommended that those users who set ADSL cats to access the Internet through routing to modify the dial-up Internet access method of ADSL MODEM, change from the built-in dial-up mode (i.e. routing method) to the bridge method, and use China Telecom's VnetClient and other PPPoE dial-up software to dial-up Internet access through the computer;
2. Enables the firewall feature that the ADSL MODEM device itself has.
3. Modify the default username and password of the adsl cat configuration management interface.
Please all users who set ADSL cats as routing methods should pay attention to prevent problems caused by network attacks and other issues, and take measures to solve security risks as soon as possible.
Previous content:
The recent thunderstorm in Zhaoqing has caused damage to a large number of broadband user equipment (MODEM and network cards). How can we keep high-load surges out and avoid the losses caused by lightning strikes on the equipment? Telecom companies remind users to pay attention to some basic lightning protection methods:
1. Pay attention to regularly checking the grounding wire used by household appliances regularly. The shells of most household appliances are almost connected to this grounding wire. The main purpose is to protect personal safety. The grounding wire can also eliminate the impact of static electricity on the equipment.
2. The choice of power sockets cannot be ignored. Use sockets with lightning protection functions! As the first "window" to connect a home and an external current, the power socket actually acts as a "family protector". (Note: The ground wire at the front end of the socket must be smooth).
3. Try not to surf the Internet during thunderstorms, because lightning strikes can be introduced through power cords or telephone lines, burning out the MODEM, or even burning out the computer network card, motherboard and other devices.
4. Household appliances must be kept at a certain distance from the exterior walls and columns of the building. Because when direct or side lightning strikes occur in the building where the residents are located, the powerful lightning current will flow into the ground along the exterior walls and columns of the building. During this process, due to strong lightning current flowing through the exterior walls or columns of the building, an electric and magnetic field is generated in the surrounding space. If household appliances are too close to the exterior walls or columns, they may be damaged.
5. Special reminder: Some users are connected to other users or devices through network cables (the same is true for telephone cables). Never expose the network cables outside the building, such as connecting between two buildings, crossing the roof to other places, etc. This can become a lightning-induced wire. Recently, telecom companies have found that many user equipment is burned like this, so be careful.
Because home users rarely install some professional lightning protection facilities, lightning protection can only start from small things to ensure the safety of household appliances.
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Article entry: csh Editor in charge: csh