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CAS Arrray + NLB + VLAN RRS feed

  • Question

  • Hi!

    I have a two CAS(LECAS1 and LECAS2) servers and they are configured to same NLB. I have also made the CAS array in exchange management shell  and both of the server are configured to be in that array.  I pointed the database to use the NLB address outlook.le.konserni. I also added the outlook.le.konserni(172.16.210.222) to our dns. NLB is configured to use unicast.

    The problem is that everything works from our default VLAN. but then if i try to access the outlook.le.konserni from another VLAN it will not work. Outlook says that the server must be online. It's strange that ping is working from every VLAN. And there are also no restrictions in VLANS. Then if change the mailbox database to use lecas1 or lecas2 servers as default servers it will work perfectly from all the VLANS(of course no NLB then..)..  I have also tried multicast. NLB console says that everything is okay..

    ANy idea what might be the problem?

     

    Thursday, May 6, 2010 11:27 AM

All replies

  • Are these physical or virtual machines?
    Casper Pieterse, Principle Consultant - UC, Dimension Data South Africa, Microsoft Certified Master: Exchange 2007
    Thursday, May 6, 2010 11:50 AM
  • Mostly it's a router / switch L3 issue..

    because the "new" NLB vip is a new "unknown" mac address, you have to let the router learn this.

    please have a look in the following cisco example: http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a0080a07203.shtml

    this shows how to add a static arp with cisco switches/routers.

    Hope this helps :)

    Ilantz

    Thursday, May 6, 2010 12:38 PM
  • Hi there, which NLB you are using is it unicast or multicast. I think that you are using multicast, if you are using multicast please note that the multicast IP is not routable and thus cannot be accessed from outside its VLAN wihout NAT. if you are using unicast please let me know
    Regards, Mahmoud Magdy http://busbar.blogspot.com http://ingazat.wordpress.com
    Thursday, May 6, 2010 6:56 PM
  • Hi there, which NLB you are using is it unicast or multicast. I think that you are using multicast, if you are using multicast please note that the multicast IP is not routable and thus cannot be accessed from outside its VLAN wihout NAT. if you are using unicast please let me know
    Regards, Mahmoud Magdy http://busbar.blogspot.com http://ingazat.wordpress.com

    Sorry but that's incorrect. When you use NLB in multicast mode you are NOT using Class D IP space. You are using a MAC out of this space but your VIP is still standard routable space.
    Active Directory, 4th Edition - www.briandesmond.com/ad4/
    Friday, May 7, 2010 10:27 PM
  • Mostly it's a router / switch L3 issue..

    because the "new" NLB vip is a new "unknown" mac address, you have to let the router learn this.

    please have a look in the following cisco example: http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a0080a07203.shtml

    this shows how to add a static arp with cisco switches/routers.

    Hope this helps :)

    Ilantz

    I'd second this recommendation. I've also seen issues on Windows 2008 boxes with two NICs in Unicast mode. What's the OS/NIC config here?

    Active Directory, 4th Edition - www.briandesmond.com/ad4/
    Friday, May 7, 2010 10:28 PM