Wireless network connection failure processing method (1)

Wireless networks, especially wireless LANs, have brought great convenience to our lives, providing us with ubiquitous, high-bandwidth network services, but due to the unique nature of wireless channels, wireless network connections With instability, which greatly affects the quality of service, this article will introduce some common wireless network faults and troubleshooting methods to help users eliminate these faults in a timely and effective manner.

1. Hybrid wireless networks are often dropped

Symptoms

Build wireless LANs using Linksys WPC54G NICs and Linksys WRT54G APs, all using IEEE 802.11g protocol. There are also a few 802.11b network cards in the network. When using the WRT54G for 54Mb/s connection, it is often dropped.

Fault Analysis

In theory, the IEEE 802.11g protocol is backward compatible with the 802.11b protocol. Devices using these two protocols can simultaneously connect to APs using the IEEE 802.11g protocol. . However, from the practical experience, as long as there is a network card using the IEEE 802.11b protocol in the network, the connection speed of the entire network will be reduced to 11 Mb/s (the transmission speed of the IEEE 802.11b protocol).

Troubleshooting

When mixing IEEE 802.11b and IEEE 802.11g wireless devices, be sure to set the wireless AP to MIXED mode. With this mode, you can also be compatible with IEEE. 802.11b and 802.11g two modes.

2. Wireless client can't receive signal

Symptom

After building a wireless LAN, the client is not able to receive the wireless AP signal.

Fault Analysis

The causes of this fault may be as follows:

(1) The wireless network card is too far away from the wireless AP or wireless router, exceeding The coverage of the wireless network is already very weak when the wireless signal arrives at the wireless network card, making the wireless client unable to make a normal connection.

(2) The wireless AP or wireless router is not powered or does not work properly, causing the wireless client to be unable to connect at all.

(3) When the wireless client is far away from the wireless AP, we often use directional antenna technology to enhance the propagation of wireless signals. If there is a problem with the angle of the directional antenna, the wireless client will not be able to connect properly. .

(4) If the wireless client does not correctly set the network IP address, it cannot communicate with the wireless AP.

(5) For security reasons, the wireless AP or wireless router will filter some MAC addresses. If the MAC address of the network card is filtered out, normal network connection cannot be performed.

Troubleshooting

The following methods can be used to solve:

(1) Install an antenna on the wireless client to enhance the receiving capability. If there are many clients that cannot connect to the wireless AP, install an omnidirectional antenna at the wireless AP to enhance the transmission capability.

(2) Check the LED indicator to check if the wireless AP or wireless router is working properly and use a laptop for close-range testing.

(3) If the wireless client uses the antenna, try to adjust the direction of the antenna to face the direction of the wireless AP or wireless router.

(4) Set the correct IP address for the wireless client.

(5) Check the security settings of the wireless AP or wireless router, and set the wireless client's MAC address to a trusted MAC address.

3. The wireless client can receive the signal normally but cannot access the wireless network

Symptom

The wireless client displays the wireless signal but cannot access the wireless network< Br>

Fault Analysis

The cause of the fault may be:

(1) The IP address of the wireless AP or wireless router has been assigned. When the wireless client is set to automatically obtain an IP address, it will not be able to access the wireless network because there is no available IP address.

(2) The wireless network card is not set to the correct IP address. When the user manually sets the IP address, if the set IP address and the IP address of the wireless AP are not in the same network segment, the wireless network will not be accessible.

Troubleshooting

The following solutions can be used:
<1> (1) Increase the address range of the wireless AP or wireless router.

(2) Set the correct IP address for the wireless network card to ensure that it is in the same network segment as the wireless AP's IP address.