DirectAccess Load Balancing Error RRS feed

  • Question

  • Hi 

    Just seeing if anyone has come across the following error when trying to enable Network Load Balancing in DA 2012.

    Error is The length of the prefix used to assign IPv6 addresses to DirectAccess clients connecting over IP-HTTPS should be 59 bits.

    Any help would be good


    Wednesday, March 25, 2015 3:24 PM

All replies

  • Hi,

    By default, DirectAccess accept a /64 prefix for the IP-HTTPS range on a single server.
    This is the IPv6 range for your clients.

    When moving to NLB, you must use a /59 range because each DirectAccess server in the Cluster will receive a /64 range based on the range you defined in the console.

    Let's say you implement a 2001::1000:/59, server1 will use 2001::1000:/64 for the clients, server2 will use 2001::1001:/64, etc...


    Edit: Carriage Returns problem on the forum when posting from my smartphone, will correct that later :-)

    Wednesday, March 25, 2015 7:09 PM
  • Hi Gerald

    Thanks for the reply.  I have set up a number of these load balanced DA environments but never had to change any IPv6 addresses.  is this something that is required in this instance?


    Wednesday, March 25, 2015 9:40 PM
  • Hello,

    Yes it is.

    Have a look there: https://technet.microsoft.com/en-us/library/jj134175.aspx

    • When NLB or an external load balancer is used, the IPHTTPS prefix cannot be changed to anything other than /59.


    Thursday, March 26, 2015 4:58 AM