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Can we use DNS and HLB together ?

    Question

  • Can we use DNS and hardware LB together for Lync deployment ? Is it supported topology ?

    Friday, September 23, 2011 12:23 PM

Answers

  • It's not a supported topology by Microsoft . As per my understanding , you may have to use either DNS load balencing or HLB . Both can't go together .

    There was a corruction , "You cannot use DNS load balancing on one interface and hardware load balancing on another. You must use hardware load balancing on both interfaces or DNS load balancing for both. A combination is not supported"

    Friday, September 23, 2011 12:26 PM

All replies

  • It's not a supported topology by Microsoft . As per my understanding , you may have to use either DNS load balencing or HLB . Both can't go together .

    There was a corruction , "You cannot use DNS load balancing on one interface and hardware load balancing on another. You must use hardware load balancing on both interfaces or DNS load balancing for both. A combination is not supported"

    Friday, September 23, 2011 12:26 PM
  • Actually for Lync you need both as there are two different types of traffic with two different load balancing requirements in Lync.

    DNS load balancing applies to the majority of traffic: authentication, signaling, media, etc.  But all of the web services traffic (80/443) needs to be handled by a traditional Hardware Load Balancer; DNS load balancing cannot be used for this.

    You can bypass the HLB requirement and hard-code a single Front End server, losing redundancy for web services traffic but still providing load balancing for signaling and media.


    Jeff Schertz | Microsoft Solutions Architect - Polycom | Lync MVP
    Friday, September 23, 2011 3:49 PM
    Moderator