Microsoft Windows Network Load Balancing (“NLB”) is the “free” out-of-the-box software load balancing solution available for Windows 2003-based Terminal Servers.
§ NLB is available with all editions of Windows Server 2003 (All versions of Windows Server 2003 come with Network Load Balancing installed)
§ Network Load Balancing works by assigning a single virtual IP address to those multiple servers that can respond.
§ Then assign a DNS name to the virtual IP address. RDP clients connect to this DNS name.
§ The system responds by automatically connecting the user to the least-busy server.
§ Network Load Balancing enables all of the configured nodes on a single subnet to detect incoming network traffic for the cluster's virtual IP address.
§ If one server has failed but is still responding to the network, the NLB system will continue to send users to it.
§ If a server failure in an NLB cluster will be detected by the other servers (through the cluster’s heartbeat packets)
Advantage of Load Balancing with Windows NLB
- It’s the “free” solution that’s built-in to Windows.
Disadvantages of Load Balancing with Windows NLB
- Load calculations are only based on network load.
- You can’t natively load-balance more than 32 servers.
- All servers must be located on the same subnet.
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