The processing method of wireless network connection fault

1. Mixed wireless networks often fall off the line

Failure phenomenon

Use the Linksys WPC54G network card and Linksys WRT54G AP to build a wireless LAN that uses IEEE 802.11G protocols and a few 802.11B network adapters. The line is often dropped when using wrt54g for 54mb/s connections.

Fault analysis

In theory, the IEEE 802.11g protocol is backward-compatible with the 802.11B protocol, and devices using both protocols can be connected simultaneously to AP using the IEEE 802.11g protocol. However, from a practical point of view, as long as there is an IEEE 802.11B protocol in the network, the connection speed of the entire network will be reduced to 11MB/S (IEEE 802.11B Protocol transfer Speed).

Fault resolution

When mixing IEEE 802.11b and IEEE 802.11g wireless devices, be sure to set the wireless AP into a mixed (MIXED) mode, which can be compatible with both IEEE 802.11b and 802.11g two modes.

2. Wireless clients do not receive a signal

Failure phenomenon

After building the wireless LAN, the client is found to receive no signal from the wireless AP.

Fault analysis

There are several possible causes for this failure:

(1) wireless network card distance from the wireless AP or wireless router is too far, more than the coverage of wireless networks, wireless signal to reach the wireless network card has been very weak, so that wireless clients can not be normal connection.

(2) The wireless AP or wireless router does not power up or does not work properly, causing the wireless client to not connect at all.

(3) When the wireless client distance from the wireless AP, we often use directional antenna technology to enhance the transmission of wireless signals, if the angle of the antenna has problems, will also lead to wireless clients can not connect properly.

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

(5) For security reasons, wireless AP or wireless router will filter some MAC address, if the MAC address of the network card is filtered out, then also can not do normal network connection.

Fault resolution

The following methods can be used to resolve:

(1) Install antennas on the wireless client to enhance reception capability. If many clients are unable to connect to the wireless AP, install the omnidirectional antenna at the wireless AP to enhance the delivery capability.

(2) Check the LED indicator to see if the wireless AP or wireless router is working properly, and use the portable computer for close-range testing.

(3) If the wireless client uses the antenna, then try to adjust the direction of the antenna, so that it faces the wireless AP or wireless router direction.

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

(5) View the security settings of the wireless AP or wireless router and set the MAC address of the wireless client to a trustworthy MAC address.

3. Wireless client can receive signal normally but can't access wireless network

Failure phenomenon

Wireless client displays wireless signal but cannot connect to wireless network

Fault analysis

The cause of this failure may be:

(1) The IP address of the wireless AP or wireless router has been assigned. When a wireless client is set to automatically obtain an IP address, it cannot access the wireless network because it does not have an available IP address.

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

Fault resolution

The following solutions can be taken:

(1) Increase the address range of the wireless AP or wireless router.

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