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MacOS 10.8/9 Strange Network Behavior

  • 1.  MacOS 10.8/9 Strange Network Behavior

    Posted Nov 06, 2013 01:04 PM

    We have seen several Mavericks now that constantly go on and offline.  This is not the 30 second EAP roaming issue, I am on top of that one.  The symptom on this one is constantly going on and offline in our 802.1x wireless network.  Packet capture does not show anything strange, just the Macbook re-requesting an IP every time it comes back online.  The VERY strange thing is that is also happening on the wired interface, almost like a bad jack or cable.  No auth or encryption of any kind in the test wired network I'm using.  The only stable connection these machines have is with our open wireless network.  I think this is probably particular to our network somehow, but thought I throw it out there.  We have seen about 4 (and one this morning running 10.8.3) so far showing this behavior.



  • 2.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 06, 2013 01:41 PM

    We did experienced really weird issues (non-roaming ) with 10.8 but haven't seen many issues with 10.9 yet .

     

    Symptom :

     

    - Device will have session going and out of nowhere it drops and it takes a while to reconnect , and according to the packet capture the device starts the EAPOL converstation and it never responds to the identity request send from the controller

     

    vfabian@brandeis.edu - Brandeis University Mail_2013-11-06_13-38-24.png" alt="Mac OSX WiFi Issues - vfabian@brandeis.edu - Brandeis University Mail_2013-11-06_13-38-24.png" src="https://higherlogicdownload.s3.amazonaws.com/HPE/MigratedInlineFiles/56c4ce14dd014b93b712e22d5d3c40f7_d9481f9b5a194b1fa6e1e0acbd15d8b4" align="center" border="0">

    - The other issue we saw was the device is able to associate / authenticate gets a valid IP address but then is unable to reach anything on the network, but in the packet capture you can see that the device is sending the traffic but not replying 

     

    I saw this issues on 6.2.1.3 and on 6.3.1.x after users upgraded to 10.9  we haven't these issues again

     

     



  • 3.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 06, 2013 05:33 PM

    From our release notes...

     

    Symptom: 802.11ac MacOS clients are unable to pass traffic to APs in tunnel forwarding mode. Scenario: This issue may be triggered by issues in the client Broadcom drivers, when there are three MPDUs in an AMSDU packet.

     

    Workaround: Change the Maximum number of MSDUs in an A-MSDU parameters in the high-throughput SSID profile to a value of 2.

     

    wlan ht-ssid-profile <profile>

    max-tx-a-msdu-count-be 2

    max-tx-a-msdu-count-bk 2

    max-tx-a-msdu-count-vi 2 



  • 4.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 06, 2013 06:25 PM

    Sorry for going slightly off topic, but regarding the "known" 30 second EAP roaming issue, could someone tell me if this behavior happens with EAP-TTLS or is only EAP-PEAP?

     

    We are using 2048 bit InCommon certs with AddTrust (intermediate) and have many reports of Macs going "off the air" repeatedly.

     

    Any info is appreciated.

     

    MIke



  • 5.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 11, 2013 10:59 AM

    I saw it on both, PEAP and TTLS.

    I was able to fix the roaming issue with this knob under ssid profile: "Rate Optimization for delivering EAPOL frames"



  • 6.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 12, 2013 04:32 PM

    @mlew2433 wrote:

    I saw it on both, PEAP and TTLS.

    I was able to fix the roaming issue with this knob under ssid profile: "Rate Optimization for delivering EAPOL frames"


    From another thread I saw you're on 6.2, right?  This knob didn't seem to help me with 6.1.3.8 or 6.3.0.2.



  • 7.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 12, 2013 04:45 PM
    FYI. This setting will be enabled by default in 6.4

    Sent from my iPhone


  • 8.  RE: MacOS 10.8/9 Strange Network Behavior

    Posted Nov 12, 2013 06:37 PM

    In my testing - also with a 2048 inCommon cert - the ~ 30 second roaming issue happens for both EAP-TTLS and EAP-PEAP

    In both cases having the Macbook trust the cert for SSL - removes the cert validation delay.


    @mldickson wrote:

    Sorry for going slightly off topic, but regarding the "known" 30 second EAP roaming issue, could someone tell me if this behavior happens with EAP-TTLS or is only EAP-PEAP?

     

    We are using 2048 bit InCommon certs with AddTrust (intermediate) and have many reports of Macs going "off the air" repeatedly.

     

    Any info is appreciated.

     

    MIke