The issue with the multicast mode is the virtual IP address NLB address becomes unreachable when accessed from outside the local subnet because Cisco devices do not accept an arp reply for a unicast IP address that contains a multicast MAC address. Are you pinging them from the same subnet or from a diffrent one?
I tried to ping both IP addresses from another host on the same subnet. I got a Destination host unreachable. However the address that I was pinging from, Office Office Exchange Server. Not an IT pro?
Resources for IT Professionals. Sign in. United States English. Ask a question. Quick access. To learn more about the cookies we use and to set your own preferences, see our Privacy and Cookie Policy. Skip to content. Network Load Balancing: Multicast vs Unicast. You must choose either Unicast or Multicast operational mode. So which one should you chose? And why? Thanks — this confirmed my suspicions that I was seeing at the switch level with the mac-addy. I have two windows server configured in nlb features on separate nic on citrix xen server host.
Please help me in this regards so that i can live this setup. This site uses Akismet to reduce spam. Learn how your comment data is processed. Are you back? On to the switch itself! What MAC address do I feed my switch configurations? We make unregistered multicast is set to forwarding default. The Results No over the top switch flooding, I can simultaneously live migrate multiple WLNB nodes and have them land on the same switch without duplicate IP address warning.
Wait, you forgot the duplicate IP Address Warning! For example, consider an environment that contains eight hypervisor hosts. Each hypervisor host has two network adapters, and all of the adapters connect to a switch. This mode is basically the same as multicast mode, except that the switches can automatically build their MAC address tables in this mode.
These messages indicate the group membership of the NLB nodes. The switches use this information to configure the MAC address table. Some of the articles that are listed in the Multicast section include the correct configuration parameters for their devices for multicast with IGMP. To verify that your equipment can support this mode, contact your hardware vendor.
From an NLB standpoint, the configuration is straightforward: Install the role, open the console, create a load-balancing cluster, select the nodes, set the NLB mode, and then set the ports and affinity. To configure a cluster node by using NLB Manager, you must be a member of the Administrators group on the cluster node. This tool is available on any computer that has NLB installed, and it is very easy to use. To start the tool, open a Command Prompt window and run the following command:.
As the screenshot shows, you can get the MAC address for each mode easily by using this command. As an alternative, you can do your math, considering the following guidelines the numbers correspond to the red numbers in the screenshot :.
This is followed by a series of hexadecimal codes that represent each octet of the VIP address. Again, this is followed by a series of hexadecimal codes that represent each octet of the VIP address. The last two parts of the address are the last two octets of the VIP address. The third-party products that this article discusses are manufactured by companies that are independent of Microsoft.
Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products. Microsoft provides third-party contact information to help you find additional information about this topic.
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