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DHCP ACK client intermittent drop

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  • 1.  DHCP ACK client intermittent drop

    Posted Nov 11, 2013 12:38 PM

    We are seeing an odd issue with clients that have the intel centrino N 2230 wireless card.  These systems are all running windows 7 and are showing the same issue.  We are using 802.1x user based authentication with PEAP.  Users can connect to the network and they never "loose" their connection, but they experience intermittent connection drops and the dhcp server will ACK for a dhcp address every minute or so.  

     

    ------ from debug log (aruba) ------

    Nov 11 12:20:22authmgrDHCP ACK seen for 60:36:dd:0f:9e:0c.
    Nov 11 12:20:22authmgrDHCP assigned address and server address updated for 60:36:dd:0f:9e:0c 192.168.253.253 192.168.253.253.
    Nov 11 12:20:22authmgrDHCP ACK seen for 60:36:dd:0f:9e:0c.
    Nov 11 12:20:22authmgrDHCP assigned address and server address updated for 60:36:dd:0f:9e:0c 192.168.253.253 192.168.253.253.
    Nov 11 12:21:25authmgrDHCP ACK seen for 60:36:dd:0f:9e:0c.
    Nov 11 12:21:25authmgrDHCP assigned address and server address updated for 60:36:dd:0f:9e:0c 192.168.253.253 192.168.253.253.
    Nov 11 12:21:25authmgrDHCP ACK seen for 60:36:dd:0f:9e:0c.
    Nov 11 12:21:25authmgrDHCP assigned address and server address updated for 60:36:dd:0f:9e:0c 192.168.253.253 192.168.253.253.
    Nov 11 12:22:27authmgrDHCP ACK seen for 60:36:dd:0f:9e:0c.

     

    I am not seeing anything unusual on my DHCP server, and these wifi cards are the only ones on our network that are having this issue.  Anyone see anything similar, and or know of a way to resolve this issue?  

     

    I did run across this forum as these users seem to be experiencing the same issues we are... and it is yet to be resolved...

    https://communities.intel.com/thread/38676?start=120&tstart=0

     



  • 2.  RE: DHCP ACK client intermittent drop

    Posted Nov 11, 2013 05:07 PM

    I am seeing the same issue (I have a thread open under education), but with Macbooks both 10.8 and 10.9.  We also use 802.1x-PEAP (and TTLS), but strange thing I also see the issue on the wired (with no authentication).  However, open wireless works fine.  I see the same exact log on my controllers as yours.



  • 3.  RE: DHCP ACK client intermittent drop

    EMPLOYEE
    Posted Nov 11, 2013 05:23 PM

    I would do a packet capture at your DHCP server to see what is really going on.  A single log is a point of view, but the actual packet capture will tell what conversation is going on and who initiated what.