Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Error With enforce DHCP

  • 1.  Error With enforce DHCP

    Posted Jul 30, 2013 09:42 AM

    Hi.

     

    When I enable the option "enforce DHCP" all works good except for a few users.

    I enable the logging for them and get the logs.

    Jul 30 01:59:28 :522026: <INFO> |authmgr| MAC=00:1b:77:88:ac:ce IP=10.1.146.106 User miss: ingress=0x10014, VLAN=40 flags=0x40
    Jul 30 01:59:28 :522141: <DBUG> |authmgr| 00:1b:77:88:ac:ce IP 10.1.146.106: drop pkt as ip not assigned through dhcp.

     


    The problem is that the user is not using an static IP. Is getting the Ip through DHCP. 

     

    The only thing different that I can saw is (prefered) after the IP address in the output of ipconfig. 

     

    Sufijo DNS específico para la conexión. . :
    Dirección IPv4. . . . . . . . . . . . . . : 10.1.146.106 (prefered)
    Máscara de subred . . . . . . . . . . . . : 255.255.255.128
    Puerta de enlace predeterminada . . . . . : 10.1.146.1

     

     

    I´m using AOS: 6.2.1.3

    Clients: Windows 7 

    Controller : 3600

    APs: 135

     

     

    Thanks in advance. 

     

     


    #AP135
    #3600


  • 2.  RE: Error With enforce DHCP

    Posted Jul 30, 2013 09:57 AM

    "Preferred" is an autoconfigured address, so that device would not have gotten it from DHCP.



  • 3.  RE: Error With enforce DHCP

    Posted Jul 30, 2013 10:02 AM

    Ok thanks but. 

     

    When I check the ipv4 configuration on the adapter it doesn´t have any IP configured.

    Where can I find that preferred configuration?

     

     



  • 4.  RE: Error With enforce DHCP

    Posted Jul 30, 2013 10:06 AM

    @erickyruz wrote:

    Ok thanks but. 

     

    When I check the ipv4 configuration on the adapter it doesn´t have any IP configured.

    Where can I find that preferred configuration?

     

     


    Check to make sure you did not run out of ip addresses in your DHCP scope.  Or, you can try the info at the link here:  http://social.technet.microsoft.com/Forums/windows/en-US/e96f0ec5-4a71-4beb-b403-06cfc4017999/autoconfiguration-ip-address-preferred



  • 5.  RE: Error With enforce DHCP

    Posted Jul 27, 2015 05:32 AM

    What does "drop pkt as ip not assigned through dhcp" actually mean? ____



  • 6.  RE: Error With enforce DHCP

    Posted Jul 27, 2015 06:48 AM

    msaw,

     

    That means that the controller did not observe the device getting its ip address using DHCP, so it does not allow it to enter the user table.



  • 7.  RE: Error With enforce DHCP

    Posted Jul 28, 2015 02:15 AM

    Hi Colin,

     

    Thank you for the explanation :)

     

    Can I check with you what would be some of the ways a client can get the IP address without controller observing?

    Perhaps the client used Static IP, 169.x.x.x IP or maybe client got its IP through another controller (local controller)? 



  • 8.  RE: Error With enforce DHCP

    Posted Jul 28, 2015 05:01 AM

    Msaw, yes those are two of the best reasons.



  • 9.  RE: Error With enforce DHCP

    Posted Jul 28, 2015 09:58 PM

    Clients can also bleed IPs from the last network they were attached to -- sometimes even their 4G radio through software glitches.  A lot of wireless providers use reserved DoD ranges so if you see addresses that map back to the DoD that's why.

     

    A lot of home networks use low-numbered subnets of 10.x especially 10.1.X.X.  If you are handing out 10.x addresses, changing your local IP range to a more unusual subnet can help you tell when this is hapenning.

     



  • 10.  RE: Error With enforce DHCP

    Posted Jul 30, 2013 10:05 AM
    We initially experienced this when we started using AOS 6.2 and it happened to certain devices . It worked fine on 6.1.2.6

    At the time we were working on other more important issues that we just decided to turn it off.

    My suggestion is to open a TAC case .