Knowledgebase
My laptop or PC cannot connect by wireless to my router
Posted by Gabriel Yu on 14 March 2008 06:53 AM
This is most commonly caused by a mismatch in the wireless security settings.

If you are adding a new device to an existing Wireless LAN, please :
  • check the wireless security method(s) you are using - i.e. MAC Address Control, WEP or WPA, SSID stealthing.  
  • If these seem correct, please try turning OFF all wireless security at both ends, and establish the wireless security one step at a time (as described below).
  • Note that some older wireless cards (which do not support WPA  encryption) can become very confused when they receive WPA-encrypted  packets .  In this situation we recommend you use 128-bit WEP, or or replace the older card(s).
If you are creating a new WLAN, we strongly suggest you turn on the security one step at a time...  Please
  • Turn off all Wireless security - i.e. MAC Address Control, WEP or WPA, SSID stealthing - and see if the laptop(s) & wireless PC(s) can connect to the router and acess the network.  Any device which cannot connect is probably a hardware, driver, or signal strength issue; and should be sorted out before turning security on.
  • If the wireless devices do connect OK, you can turn ON the security - one step at a time - and check after each step.  If you encounter a problem you will only have made one change, so will know exactly what to check to fix it.
  • Note that SSID stealthing, MAC Address filtering and WEP/WPA encryption all independent, and you can enable any combination. 
    However WEP and WPA are both encryption techniques, and each client device can only use one.  Most Draytek routers also allow for some devices using WEP and some other devices using WPA to be connected; though this is not always reliable.
  • If the wireless doesn't get a DHCP address with NO security enabled, please capture a syslog and post here for us to investigate further.
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