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Dual DHCP Leases?

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  • 1.  Dual DHCP Leases?

    Posted Jan 06, 2015 10:14 AM

    Hello All,

     

    I have a group of medical devices that obtain a user role on a PSK SSID that assigns them to a VLAN based on MAC OUI.  I notcied in the logs upon connection that the devices get a DHCP address on the default VLAN and then grab another DHCP address on their appropriate VLAN.  I can see why this could occur on a wireless network but in anyone's experience, is this the expected behavior?  

     

    Thanks in advance!



  • 2.  RE: Dual DHCP Leases?

    EMPLOYEE
    Posted Jan 06, 2015 10:37 AM

    dhbennett,

     

    What method are you using to move the device to a different VLAN, a user derivation rule?

    You should enable debugging on a client to see what VLAN it ends up in and for how long:

     

    config t

    logging level debug user-debug <mac address of user>

     

     

    When you have connected the device, you should type "show log user-debug all" to see if you see what VLAN(s) your client ends up in...

     



  • 3.  RE: Dual DHCP Leases?

    Posted Jan 06, 2015 10:46 AM
      |   view attached

    Hi,

     

    Thanks for your reply.  That's what I have done (I was debugging the device for another issue when I noticed this).  I am using a user derivation rule and it does end up on the correct VLAN.  I'm attaching a log which will hopeful clarify what I am experiencing.

    Attachment(s)

    txt
    userdebug.txt   4 KB 1 version


  • 4.  RE: Dual DHCP Leases?
    Best Answer

    EMPLOYEE
    Posted Jan 08, 2015 02:40 AM

    Is that a vlan-derivation rule you have?

     

    I would expect to see that behaviour if it was a dhcp fingerprint rule, but not for a normal vlan-derivation.

     

    Have you tried a role derivation rule, but in the role you specify the vlan?