How to resolve the threat of wireless network security (i)

Low-grade wireless LAN networks have been rapidly gaining popularity in recent years, along with lower prices for Low-cost wireless network devices and easier operations. In order to facilitate the sharing of resources, wireless printing, mobile office operations, we only cost hundreds of yuan to buy a common wireless router and a wireless network card equipment, you can quickly build a simple wireless LAN network. However, the continuous popularization of low-grade wireless LAN network, but also easy to the unit's information security to bring no small threat. In this case, how can we solve the low grade wireless network security threats, enjoy the fast and convenient network?

The security drawbacks of low grade network

Wireless connection to the community broadband network, and through the broadband network to share access to the Internet in the network environment, we often only first through the common twisted pair of low-end wireless router WAN port and community broadband network of the exchange port together, Then the reference instructions to the wireless router connection port parameters to the appropriate settings, you can access the Internet. Because in the default state, the low-end wireless router will automatically enable the DHCP service function, when we have the wireless network card device installed correctly on the normal computer, no need to make any parameter settings can automatically connect to the wireless LAN network. However, in the enjoyment of networking facilities at the same time, the low grade wireless router's signal coverage can reach up to 300 meters, if not to take precautions, then the 300 meters within the range of installed wireless network card equipment of the ordinary computer can automatically join the local wireless LAN network, That way, local wireless LANs are vulnerable to illegal attacks.

From the current point of view, the establishment of a convenient low grade wireless LAN has some of the following security drawbacks:

1, the security mechanism is not very sound

Low-grade wireless LAN most of the use of the security performance of the general WEP protocol to the wireless internet signal encryption transmission, but not the use of security can be high WAP protocol to protect the transmission of wireless signals. Ordinary Internet users even use the WEP encryption protocol, with WEP key settings, the illegal attacker can still easily decipher the encrypted signal through some professional attack tools, making it very easy to intercept information such as the client's Internet address, network identification name, wireless channel information, WEP key content, and so on, with this information in hand, Illegal attackers can easily steal privacy or other illegal intrusion operations on the local WLAN network.

In addition, low grade wireless LAN almost does not support the System log management, intrusion detection and other functions, it can be said that the low grade wireless local area network security mechanism is not very sound.

2. Physical isolation is not possible

Low-grade wireless LAN from the establishment of the success of the moment, directly exposed to the outside world, wireless network access can not be any effective physical isolation, a variety of intentional, unintentional illegal attacks at any time, then wireless LAN in a variety of privacy information will be secretly stolen, access.

3, the user security awareness is not enough

Low-grade wireless LANs tend to support simple address bindings, address filtering, and encrypted transmission functions, which have little protection against illegal attackers. However, some people who are not familiar with the wireless network knowledge in order to quickly realize mobile office, resource sharing and other purposes, often will not hesitate to choose the Low-cost Network, management and maintenance of a simple low grade wireless LAN, as to the security of Wireless LAN, It is believed that these novice internet users will hardly take any consideration. Coupled with these novice users who are less familiar with the wireless network knowledge, less aware of the knowledge of the network security, these users in the process of using the wireless network is very little conscious of some security settings operations.

4, the ability to resist external interference is poor

Wireless LAN in the process of working, often choose a specific work frequency band, in the same working band too much wireless network, the signal coverage will overlap each other, this will seriously affect the strength of the effective signal, the end may affect the wireless LAN signal transmission stability; In addition, wireless internet signal in the transmission process, Particularly vulnerable to wall-like buildings such as blocking or interference, this will also have a certain impact on the stability of wireless LAN. For those low grade wireless LAN, its ability to resist external interference is even worse, obviously such wireless LAN is unable to meet the requirements of High-quality network access applications.

Back to the column page: http://www.bianceng.cnhttp://www.bianceng.cn/Network/Security/