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  • 1.  Connected devices mac address missing from interface??!!

    Posted Aug 25, 2024 12:21 PM

    Hi,

    I have network running on fw 10.13.1030 with fully functional FreeRadius setup and mac authentication enabled in switch ports with following configuration:

    interface 1/1/4
        no shutdown 
        flow-control rxtx
        vlan access 1
        aaa authentication port-access client-limit 8
        aaa authentication port-access mac-auth
            enable
     

    At this moment in this port there is 100mbps video controller with static ip connected at the moment and last log entry for the port says:
    2024-08-25T14:01:29.896816+03:00 ..... hpe-mstpd[2642]: Event|2012|LOG_INFO|AMM|1/1|CIST - Topology Change generated on port 1/1/4 going in to forwarding...

    But mac-address table for the port is empty?!? How is that possible? Does port-access drop mac off in some situations? Another thing is that I cannot see mac-address in log entries either.

    I have about 1500 devices in this network and from that count about 99% works just fine with port-access configuration above but there seems to be few device models wich refuses to pass mac-address to switch if device has static ip address (I'm not absolutely sure if dhcp/static ip addressing has nothing to do with this problem) Rest of the devices does not have any problems what so ever.

    Is there something missing from my configuration?



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    Jori Luoto
    AV-IT Specialist
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  • 2.  RE: Connected devices mac address missing from interface??!!

    Posted Aug 26, 2024 06:03 AM

    If the device does not send any traffic, you won't see a mac address (nor for authentication, nor in the mac-address table).

    Some devices, when configured with a static IP, behave like that. And they may need some incoming traffic first before they respond and start sending traffic. Please verify that the device is sending traffic.... Some devices can be configured with NTP, which in many cases is a good way to force sending traffic; or use DHCP (with a fixed lease allocation to make sure it always gets the IP address that you want).

    If you configure a port-mirror on the device's port, you may be able to see if there is something coming in on the port.



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------



  • 3.  RE: Connected devices mac address missing from interface??!!

    Posted Aug 26, 2024 02:58 PM

    This was good one, thanks! I checked out traffic situation with port mirror and device did not communicate with network at all. I tested also with static vlan (no auth stuff what so ever) and there still were no mac address available in port so I wonder how can there be incoming traffic at all to trigger device to send something if there is no mac address available in first place?



    ------------------------------
    Jori Luoto
    AV-IT Specialist
    ------------------------------



  • 4.  RE: Connected devices mac address missing from interface??!!

    Posted Aug 27, 2024 04:47 AM

    Common options: configure NTP, configure syslog, configure DHCP (with static lease if you need 'static-like' behavior).

    Another option would be to ping the device from a network management system, and make sure that in the initial role/vlan the device is reachable and will respond to the ping (or first with an ARP), triggering the port authentication.



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------



  • 5.  RE: Connected devices mac address missing from interface??!!

    Posted Aug 27, 2024 12:15 PM

    Such silent devices are terrible for MAC-Auth. The authentication type is dependent on data traffic, no incoming packets at the switch port means no authentication. 



    ------------------------------
    Regards,

    Waldemar
    ACCX # 1377, ACEP, ACX - Network Security
    If you find my answer useful, consider giving kudos and/or mark as solution
    ------------------------------



  • 6.  RE: Connected devices mac address missing from interface??!!

    Posted Aug 27, 2024 12:35 PM

    I agree! There is no way to authenticate without mac and my problematic gear (merely RS232->Ethernet component transforming about 200 buttons and fader data to control traffic over udp) really don't talk to network at all if they have no connectivity to server. I will checkout the document sent if there would be fix there...



    ------------------------------
    Jori Luoto
    AV-IT Specialist
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