Laptop cannot detect home WLAN server

15 pts.
Tags:
IBM T42 Thinkpad
Internet connectivity
Routers
Siemens Gigaset WLAN server
Wireless routers
WLAN
I have two T42 laptops which connect to a Siemens Gigaset Wlan server. One has been used by my son at boarding school and the settings have probably been changed. It now does not see the home Wlan server any more, even so it still sees weaker servers in surrounding houses. The second T42 sees and connects to the home Wlan without problems. Which settings can I check and change to enable my sons laptop to connect to our Wan again?
ASKED: January 31, 2009  9:23 PM
UPDATED: February 4, 2009  7:46 PM

Answer Wiki

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go to network places and check if the wireless connection has been enabled if else enabled it and just obtain the ip automatically enable to connect to the internet

If you have an old connection, go to wireless connection and either manually edit or delete the connectoid for your home wireless network. Then try to rediscover. There is a bug where the connection can be changed from automatically connect to manually connect which can cause you some issues. Also, if you have disabled the SSID broadcast in the wireless router, that can cause you issues. It is recommendeed that you use encription (WPA or WPA2 (prefered)) to protect your wireless connection and leave the SSID broadcast enabled.

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  • Wlannovice
    Thank you very much for your answer Admin89, wireless connection is enabled on the T42 in question and automatic IP as well.
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  • Pjb0222
    And yes, there are a number of places that say to "hide" the SSID. That is a different discussion (done by people with better technical skills than mine). It only prevents the SSID from being automatically added to the available networks list and in no way prevents someone with bad intentions from finding your AP (if it is on, it is sending out a BEACON) or the SSID (there are several methods of discovering, having it in the BEACON is only one). What "hiding" the SSID actually does. The AP will send a service BEACON anytime it is enabled. Within the BEACON the AP advertises its services (networks). In this advertisement the SSID is included in the broadcast, hence SSID broadcast. To "hide" the SSID the AP inserts a NULL SSID into the BEACON broadcast. So, your AP is still discoverable and the information that there is a configured service is there for all to see. An attacker will see the NULL SSID and know to use an alternative method to obtain the SSID. To obtain the actual SSID all the attacker must do is one of three things: 1. Wait for a system to connect/reconnect to the AP which will broadcast the SSID as part of the connection sequence. 2. Send a forged disconnect packet to a connected system so that it sends a reconnect request which broadcasts the SSID. 3. Simplest, it asks the AP what SSIDs are configured. It just sends a broadcast connect message to the AP which triggers the AP to send it a list of services which includes the SSID. By the way, some systems have included broadcast discovery in their systems. They will discover even "hidden" SSIDs. Current OS/X anyone?
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