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Windows NLB load balancing is free to use with Windows Server.

If 2 servers are setup in cluster: Server 1 and Server 2

General Logic#

• There is a Virtual IP address (VIP) bound to 2 network cards (NICS), the main site domain is setup to point at this.
• All requests use sticky sessions
• Server 1 is the primary server and all routing is directed via server 1

If Server 1 fails#

• any new connections are refused
• existing users on Server 2 are ok

If Server 1 is gracefully removed from cluster#

• Server 2 becomes primary
• Existing users on Server 1 will lose session and be redirected to Server 2

If Server 2 fails or is gracefully removed from cluster#

• All requests are handled by Server 1
• Existing users on Server 2 will lose session and be redirected to Server 1

If Server 1 fails server 2 can be made the primary server manually.#

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