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Network Drop issue RRS feed

  • Question

  • Hi Friends,

    We have a scenario. 

    Os: Windows 2012/2012R2 running on 2 Hosts.

    On top of this Hyper-v is Enabled with Clustering configuration.

    On top of Hyper-v, Exchange 2010 CAS Servers are running on two VMs

    On both CAS VMs,  Under Private NIC Configuration, MAC Spoofing is enabled.

    On Exch CAS Servers, WNLB is configured in Unicast Mode

    Issue is:

    When WNLB Cluster in formed, after sometime, all other VMs running on two Hosts experience network drop issue. When we remove the WNLB Configuration, after some time, issue disappears.

    Wondering, what could be the issue and any suggestion towards troubleshooting are welcome.


    Best Regards, Ranjit Singh

    Thursday, April 23, 2015 2:11 PM

Answers

  • Are they experience drop issues to the Exchange Servers (CAS) or other servers?

    What you are doing should work properly. But. depending on your network scenario NLB in unicast mode can casuse issues when each CAS is located on another Hyper-V host. I highly recommend you to configure NLB in IGMP Multicast mode. It is certainly the best mode and is easy to configure. But, you have to know how it works and what it involves in your network.

    I am using IGMP Multicast all the way. It work flawless.


    Boudewijn Plomp | BPMi Infrastructure & Security

    This posting is provided "AS IS" with no warranties, and confers no rights. Please remember, if you see a post that helped you please click "Vote as Helpful", and if it answered your question, please click "Mark as Answer".

    • Proposed as answer by Elton_Ji Sunday, May 10, 2015 1:55 PM
    • Marked as answer by Elton_Ji Monday, May 11, 2015 9:29 PM
    Tuesday, April 28, 2015 2:16 PM

All replies

  • Hi Sir,

    >>

    Os: Windows 2012/2012R2 running on 2 Hosts.

    On top of this Hyper-v is Enabled with Clustering configuration.

     

    This is VM cluster or Hyper-v Host Cluster ? Hyper-v cluster consists of  2012 and 2012R2 host ? 

    As we know cluster needs identical OS .

    As to CAS NLB configuration please refer to following article :

    http://blog.morecoffeeany1.com/2010/03/19/building-nlb-exchange-2010-rtm-cas-ht-servers-hyper-v-%e2%80%93-part-1/

    Best Regards,

    Elton Ji


    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com .

    • Proposed as answer by Elton_Ji Sunday, May 10, 2015 1:54 PM
    Sunday, April 26, 2015 9:36 AM
  • Hi,

    There is a Hyper-v Cluster running on Windows 2012 R2 OS

    Do we need MAC Address Spoofing enabled for forming WNLB Cluster on Windows 2012?

    Does this network drop issue occurs due to MAC Address Spoofing enabled?

    Could be Unicast WNLB Cluster Configuration causing the issues? Currently Unicast is configured and issue is there.


    Best Regards, Ranjit Singh


    Monday, April 27, 2015 6:02 AM
  • Are they experience drop issues to the Exchange Servers (CAS) or other servers?

    What you are doing should work properly. But. depending on your network scenario NLB in unicast mode can casuse issues when each CAS is located on another Hyper-V host. I highly recommend you to configure NLB in IGMP Multicast mode. It is certainly the best mode and is easy to configure. But, you have to know how it works and what it involves in your network.

    I am using IGMP Multicast all the way. It work flawless.


    Boudewijn Plomp | BPMi Infrastructure & Security

    This posting is provided "AS IS" with no warranties, and confers no rights. Please remember, if you see a post that helped you please click "Vote as Helpful", and if it answered your question, please click "Mark as Answer".

    • Proposed as answer by Elton_Ji Sunday, May 10, 2015 1:55 PM
    • Marked as answer by Elton_Ji Monday, May 11, 2015 9:29 PM
    Tuesday, April 28, 2015 2:16 PM