Load Balancing SMTP traffic on Exchange 2010 RRS feed

  • Question

  • Hi Everybody.

    My organization using Exchange 2010 SP1 UR5 and we have 2 Hubtransport server config Windows NLB.

    Message come from internet to MTA using postfix and routing through IP NBL. But message from MTA going only to Hub1 or Hub2 not balancing on each Hub.

    Please help me explain and advice solution to load balancing SMTP Traffic.

    Many Thanks.

    Monday, August 3, 2015 9:48 AM


  • Check your NLB affinity settings. Probably it is set to "Single". I think the correct is:

    The Affinity parameter is applicable only for the Multiple hosts filtering mode.

    • The None option specifies that multiple connections from the same client IP address can be handled by different cluster hosts (there is no client affinity). To allow Network Load Balancing to properly handle IP fragments, you should avoid using None when selecting UDP or Both for your protocol setting.


    Monday, August 3, 2015 11:32 AM

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