NLBの操作モード（ユニキャスト、マルチキャスト）の違い

Cluster Operation Mode

· Multicast:

• Choose this option if you want cluster nodes to be accessed through both their Public IP and Private IP address.
• This option is optimal if you have one Network Card installed because Private IP would be functional as well as no application using this Private IP would be affected
• AC address is changed into multicast MAC address.
• If clients are accessing Cluster through a Router (in another LAN) make sure that the router support ARP (mapping more than IP address to one MAC address).
• IGMP can be enabled which eliminate switch flooding (only cluster ports can pass)

· Unicast

• Choose this option if you want cluster nodes to be accessed only by Public IP, If you had one Network card and you chose Unicast then your server would not be accessed through its Private IP anymore. You would access it only through its public IP.
• his option is optimal if you have two network cards, where you can configure one as public IP and the other as Private IP.
• Using Unicast would provide more performance gain than Multicast.
• Cluster MAC address overrides built-in MAC address (some adapters don’t allow this ,in this case you need to replace it with another one).

When you use the unicast method, all cluster hosts share an identical unicast MAC address. Network Load Balancing overwrites the original MAC address of the cluster adapter with the unicast MAC address that is assigned to all the cluster hosts.

When you use the multicast method, each cluster host retains the original MAC address of the adapter. In addition to the original MAC address of the adapter, the adapter is assigned a multicast MAC address, which is shared by all cluster hosts. The incoming client requests are sent to all cluster hosts by using the multicast MAC address.

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