Article ID: 233279 - View products that this article applies to.
This article was previously published under Q233279
The dedicated Internet Protocol (IP) address you configure during Windows NT Load Balancing Service (WLBS) or Windows 2000 Network Load Balancing (NLB) Setup is the local host's unique IP address used for dedicated traffic to the host or network traffic not associated with the cluster. The WLBS or NLB driver passes all packets addressed to the dedicated IP to the TCP/IP stack.
There are two types of dedicated traffic:
WLBS and NLB use the dedicated IP address when you use a single network adapter to handle both cluster network traffic and dedicated traffic. In this case, the cluster's IP address and the dedicated IP address are bound to the same network adapter. WLBS and NLB ensure that all traffic to the dedicated IP address is not affected (even when the WLBS or NLB host is not part of a cluster because of problems).
NetBT (NetBIOS over TCP/IP) binds only to the first IP address on a network adapter. When you use a single network adapter, the first IP address is either the cluster IP address or the dedicated IP address. If an IP address is not the first one listed, it does not communicate using NetBT.
An additional network adapter is recommended for separating cluster and dedicated traffic on each host. If you use separate network adapters to handle cluster network traffic and dedicated traffic, only the cluster's network adapter is bound to the WLBS or NLB driver. Network traffic to the dedicated IP address is not associated with the WLBS or NLB driver.
For additional information, please see the following article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/197991/EN-US/ )How to Configure WLBS Using Multiple Network Interface Cards