Wireless DHCP doesn't work until wired Ethernet plugged in

Posted by MT_Head on Super User See other posts from Super User or by MT_Head
Published on 2009-10-07T18:01:30Z Indexed on 2010/03/09 11:08 UTC
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A client of mine has an Asus R1F tablet running Windows XP Tablet SP3. It has an Intel 3945ABG wireless card; wired Ethernet is a Realtek something-or-other. In the past few days, it's developed an odd problem:

  • WiFi authenticates, but can't get an address via DHCP.
  • plug in wired Ethernet - both interfaces get good addresses
  • unplug cable, WiFi continues to work until shutdown.
  • Next morning, repeat process.

I've tried:

  • turning WiFi off/on (there's a slider switch)
  • disabling/re-enabling via Device Mangler
  • uninstalling and reinstalling the driver for the 3945ABG...
  • changing from Intel Pro/SET to Windows Wireless Zero Config (and back)
  • restarting the router
  • changing the static DHCP assignments at the router
  • upgrading the router firmware, just on general principles

The router/access point is pfSense 1.2.3RC1 (was 1.2.2); wireless card is Atheros-based. None of the 12 other users (5 with tablets) are having problems.

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