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Why Should I Not Set Link Local for Both the Wired and the Wireless Configurations?

Hardware: Multifunction DAQ (MIO)>>Wireless DAQ>>WLS-9163

Problem:
I'm setting up the wired and wireless configuration for my WLS-9163, and both have been set to link local. After this setup is done, if I disconnect the ethernet connection, I get an error message like the one in figure 1, with error number -201250:

 



Solution:
The first thing you will do is to connect your WLS-9163 with an ethernet cable to your computer. When connecting your WLS-9163 in this way, obtaining the IP address will default to "Link Local", due to the fact that you probably don't have a DHCP server running on your computer.

The second step will be to set the wireless configuration. If you also set the wireless on the WLS-9163 to use "Link Local" the computer will communicate with the device through the wire link while both links are up. This will allow you to use the WLS-9163 without problems while the wire link is up. 

If you unplug the cable and you try to "refresh" Measurement and Automation Explorer, error message -201250 will pop up since your computer is still trying to access the device through the ethernet link. Moreover, if you delete the WI-FI DAQmx configuration at this point, the WLS-9163 won't show up agian in MAX by pressing “Find Network NI-DAQmx Devices” or "Refresh list". To solve this press the RESET button on the WLS-9163 till the STATUS LED comes up (more then 5 secs).

To solve this problem you have three options:
  1. Best: don't use link local and set your devices with static IP configuration for either the wireless link or the wired link.
  2. Better: modify the routing table in windows to route traffic to the wireless card. (This is beyond the scope if this knowledge base).
  3. Good: Disable your ethernet connection to force all the traffic to go through the wireless connection.


Related Links:
External Site: Link Local Request for Comments 3927

Attachments:





Report Date: 08/28/2008
Last Updated: 10/15/2010
Document ID: 4ORFG8D2

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