Wireless network can not even go to do?

Source: Internet
Author: User
Tags mixed

1. Set all correct, but unable to access wireless network

Failure phenomenon

The network settings are based on other users within the wireless network, including WEP encryption, SSID and IP address (automatically obtaining an IP address), and the wireless signal is displayed as Mange but cannot be connected to the wireless network.

Fault analysis

This may be the case where the network administrator has set up MAC address filtering on the wireless AP, allowing only the specified MAC address to be connected to the wireless network, and denying unauthorized users to secure the wireless network.

Fault resolution

Can contact with the management, the MAC address of your wireless card to tell him, ask him to add this MAC address to allow access to the MAC address list.

2. Wireless access to the home network for notebook computers for Internet sharing

Failure phenomenon

The home network uses "ADSL Modem + Broadband router" to achieve Internet sharing without the need for PPPoE dialing. The new notebook computer is not connected to the wireless network for Internet sharing.

Fault analysis

The wireless AP generally has only one LAN interface, therefore, when the wireless AP is connected to the network, it will occupy the network interface used by the original host, unless the broadband router has more ports, the wireless AP and the original host can not be connected to the broadband router, thereby sharing the Internet connection.

Fault resolution

If there are no more ports available for broadband routers, you can purchase a wireless router, a WAN port to a broadband router, a LAN port to the host, and wireless access to your laptop. In addition, the SOHO switch + wireless AP can also be used to connect the SOHO switch to the broadband router, and then connect the wireless AP and host to the SOHO switch.

3. Mixed wireless networks often fall off the line

Failure phenomenon

4. 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 transmission 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.

5. 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. Wireless network has no signal

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

You can use the following methods 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, 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.

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

Failure phenomenon

The wireless network has a signal connection.

Fault analysis

The wireless network has a signal why is it not connected? The cause of the 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.

7. The wireless network can communicate normally, but cannot communicate with the Ethernet connected with the wireless router.

Failure phenomenon

Wireless clients can communicate with the wireless router normally, but cannot communicate with the Ethernet that is connected to the wireless router.

Fault analysis

The cause of this failure may be:

(1) Local area network (LAN) port connectivity failure.

(2) The IP address is set incorrectly.

Fault resolution

You can use the following workaround:

(1) Check the LAN port for the correct Ethernet connection by looking at the LAN LEDs. You should use a crossover line to connect LAN ports and Ethernet hubs.

(2) to see whether the wireless network and Ethernet are in the same IP address segment, and only hosts within the same IP address segment can communicate.

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