In unicast mode, NLB uses the NLB MAC address to replace the original hardware MAC address of each adapter in each node of the cluster. In actuality, you may have to modify the infrastructure to manage network traffic. ![]() In theory, you don't have to do anything else in your network infrastructure. Unicast is the simplest operation mode to configure. Each mode has different implications for the network infrastructure. However, serious problems can develop if you haven't prepared your network infrastructure to support the mode that you are using. All three modes work very well if your infrastructure is correctly configured. You can configure an NLB cluster in one of three operation modes: Unicast, multicast, or IMGP multicast. Requires that the network hardware have specific capabilities that the other modes do not need Additional advantage of automatic configuration.The network switches must be capable of IGMP snooping. Each adapter uses its built-in MAC address.More efficient use of bandwidth and lower risk of performance impacts than unicast mode.The network infrastructure must use a static ARP entry and a static MAC address table entry. Not appropriate for more complex environments.May flood other systems with network traffic, causing performance issues (you may have to use additional hardware to resolve those issues). ![]() ![]() NLB must be able to change the MAC adapter address. The following table summarizes the requirements, advantages, and disadvantages of each mode. All of the nodes in a cluster must use the same operation mode.
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