Several common wireless network faults and Solutions

This article describes in detail how to troubleshoot and solve network faults for wireless router users. How can we solve these problems? I believe this article will benefit you a lot.

Wireless Network Fault 1

Access fails when the network environment changes.

Fault description: wireless networks are built in the office and home. While in the office, the laptop can connect to the company's wireless network normally; however, after returning home, it is found that it cannot connect to the wireless network.

Fault analysis: the causes of the fault may be as follows:

(1) The Service Set Identifier configuration is not modified in time. Different wireless networks use different SSID. If the SSID configuration is incorrect, the AP cannot be pinged. In addition, the laptop will ignore this AP and search for a new AP Based on the SSID configuration.

(2) WEP encryption. If the WEP Key used is different, the wireless client cannot connect to the new Wireless AP. If WEP is not configured correctly, the wireless client cannot obtain the IP address from the DHCP server. If a static IP address is used, the wireless client cannot even ping the IP address of the AP.

(3) ip address information. Generally, the Wireless AP automatically assigns an IP address to the wireless client. If the IP address of the wireless client is set manually, the client cannot communicate with the new AP.

Troubleshooting: the following solutions can be used:

(1) when accessing a new wireless network, change the SSID settings of the client in time.

(2) If a key is required to access the wireless network, you must first obtain the key of the network for access to the new wireless network.

(3) generally, you can use the IP address assigned by the Wireless AP. To use a static IP address, make sure that the static IP address and the IP address of the Wireless AP are in the same network segment.

Wireless Network Fault 2

The settings are all correct, but the wireless network cannot be connected.

Fault description: other users in the wireless network have configured the network, including WEP encryption, SSID, and IP address (the IP address is automatically obtained), and the wireless signal is displayed as full, but cannot access the wireless network.

Fault Analysis: In this case, the network administrator may have set a MAC address filter for the Wireless AP, allowing only the specified MAC address to be connected to the wireless network, and rejecting unauthorized users, to ensure the security of the wireless network.

Troubleshooting: You can contact the Administrator to tell him the MAC address of your wireless network card and ask him to add the MAC address to the list of MAC addresses allowed for access.

Wireless Network Fault 3

Connect your laptop to your home network wirelessly for Internet sharing

Fault description: the home network uses the "ADSL Modem + Broadband Router" method to achieve Internet sharing, without the need for PPPoE dialing. The new laptop cannot be connected to a wireless network for Internet sharing.

Fault analysis: a Wireless AP generally has only one LAN interface. Therefore, when a Wireless AP is connected to the network, it occupies the network interface used by the original host unless the Broadband Router has more ports, otherwise, the Wireless AP and the original host cannot be connected to a Broadband Router to share the Internet connection.

Troubleshooting: If the Broadband Router does not have more ports for use, you can purchase a wireless router. The WAN port is connected to the Broadband Router, And the lanport is connected to the host, and provides wireless access for laptops. In addition, the "SOHO switch + Wireless AP" method can also be used to connect the SOHO switch to a Broadband Router, and then connect the Wireless AP and the host to the SOHO switch.

Wireless Network Fault 4

Wireless AP does not have the routing function

Fault description: Use the ADSL virtual dialing method to access the Internet, and connect the Wireless AP to the ADSL Modem. The desktop (the lanport connected to the Wireless AP) can access the Internet normally. The laptop also receives wireless signals, but cannot access the Internet normally, and the IP address and default gateway are displayed as "unavailable ".

Fault Analysis: If the ADSL Modem does not support the routing function, Wireless AP cannot be used for Internet Connection Sharing.

Troubleshooting: You can solve the problem as follows:

(1) Enable the routing function of the ADSL Modem to share network connections.

(2) purchase a wireless router, connect the LAN to the desktop, and connect the WAN to the ADSL Modem.

(3) install two NICs on the desktop and set them as ICS hosts. One network adapter is connected to the ADSL Modem, And the other network adapter is connected to the Wireless AP.

Wireless Network Fault 5

Build a peer network using a wireless network adapter

Fault description: two desktops access the Internet through ADSL. Now we need to connect two computers wirelessly.

Troubleshooting: the solution is simple. You only need to buy two wireless NICs. Install the two NICs on two computers respectively to build a peer-to-peer network, implement all Ethernet functions, and share the internet. It should be noted that when this method is used, the transmission rate will be about 6 Mb/s of the IEEE 802.11b protocol theoretical speed (11 Mb/s.

Wireless Network Fault 6

No other computers in the wireless network

Fault description: the wireless network card is displayed to work normally, but other computers in the network cannot be seen in the network neighbors.

Fault Analysis and Solution:

(1) Check the SSID and WEP parameter settings to make sure the spelling and case are correct.

(2) Check whether file and printer sharing is enabled on the computer, and confirm that the Microsoft network file and printer sharing check box is selected on the "General" tab of wireless network properties.

Wireless Network Fault 7

Low transmission rate of IEEE 802.11g

Fault description: to ensure the compatibility of wireless network standards, we generally select wireless APs and wireless NICs that support IEEE 802.11b/g when selecting wireless products. However, in the actual network test, we found that the transmission rate of the wireless link is still low without interference and limited transmission distance, and cannot reach the nominal 54 Mb/s.

Fault Analysis: IEEE 802.11g not only delivers 54 Mbit/s transmission speed, but also is compatible with IEEE 802.11b wireless devices, so as to smoothly upgrade 802.11b wireless networks to 802.11g wireless networks.

Troubleshooting: to be compatible with the existing 802.11b wireless LAN equipment, in addition to using the same GHz band as 802.11b, 802.11g also uses two different OFDM (Orthogonal Frequency Division Multiplexing) encoding technologies, and the corresponding 802.11b or 802.11g device. That is to say, in a network that uses both 802.11b and 802.11g wireless devices, wireless devices that use 802.11g can communicate with 802.11b devices at a rate of 54 Mb/s, it can also communicate with the 802.11b device at a speed of 11 Mb/s.

However, in a wireless LAN, shared channels are used. The data link layer uses CSMA/CA (multi-channel access to audio frames with conflicting avoidance) to control wireless channels. That is to say, when a host is communicating with the AP, other hosts can only be in the listening status. Once the communication between the host is complete, other hosts can control the channel through competition.

Therefore, in a wireless network that uses both 802.11b and 802.11g, because 802.11b cannot monitor the Communication Status of 802.11g, it is possible to seize the wireless channel while the 802.11g device communicates, this seriously interferes with the communication between 802.11 devices.

To solve this problem, the 802.11g protocol adopts the "RTS/CTS" technology. Before sending data, a wireless LAN device must Send an RTS (Request To Send) frame To the Wireless AP To Request wireless resources. If the AP does not communicate with other devices, send a CTS (Clear To Send) frame To the device To notify it To communicate with the Wireless AP. In this way, the above interference problems are avoided.