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Network Load Balancer Setup Configuration

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					     Quick Reference                                                                     NLB Setup & Configuration



                       Network Load Balancer Setup & Configuration
Introduction
This quick reference is the result of a simple lab intended to understand the basics of a Windows 2008 Network Load
Balancer (NLB) Cluster. It was created in a Hyper-V environment using one physical server with only one Network Interface
Card (NIC). Two NICs are ideal but we decided to still enjoy the learning curve despite Sandbox hardware limitations.

NLB Server (192.168.1.10)
1.   Installed the Server Core version of Windows Web Server 2008 R2. Then used SConfig to configure network settings,
     computer name, domain, remote management, remote desktop, date/time, and Windows Update settings. The initial
     screen of SConfig follows:




2.   Installed the NLB role on Server Core using the following Windows Optional Component Setup command:

     Ocsetup NetworkLoadBalancingHeadlessServer

Server Hosts (192.168.1.11 and 192.168.1.12)
3.   Added the NLB feature to two full server VM installations of Windows 2008 R2.




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     Quick Reference                                                                  NLB Setup & Configuration

Remote Server Administration Tools (RSAT) for Windows 7
4.   Downloaded and installed RSAT on a Windows 7 PC. Turned on Network Load Balancing Tools.




NLB Configuration
5.   Started Network Load Balancing Manager in Windows 7 Administrative Tools. Then selected New->Cluster to
     configure the first server host (192.168.1.11):




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     Quick Reference                                                                           NLB Setup & Configuration

6.   As part of the configuration of the first server host, specified the IP address of the NLB Server (in other words, the IP
     address of the primary server that acts as the entry point for the NLB Cluster).




7.   Indicated the full Internet name of the NLB Server and the cluster operation mode.




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     Quick Reference                                                                    NLB Setup & Configuration

8.   Removed the default port rule and added a new one to accept HTTP connections in port 80.




9.   Added and configured the second server host (192.168.1.12):




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    Quick Reference                                                                       NLB Setup & Configuration




10. After a minute or two, noticed that the server hosts were not being bound to the NLB cluster.




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    Quick Reference                                                                      NLB Setup & Configuration

11. To correct the NLB not bound problem, changed manually the Advanced TCP/IP Settings of the server hosts: (a) added
    the IP address of the NLB Server below the unique IP address of each server host, and (b) added the IP address of the
    default gateway.




12. After restarting the corresponding VMs, started each server host in the cluster using the Network Load Balancing
    Manager.




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    Quick Reference                                                                        NLB Setup & Configuration

13. Deployed a simple HTML page to each server host (192.168.1.11 and 192.168.1.12) to display server information
    (Server 1 or Server 2). Then tested the rendering of this page through the NLB Server to confirm that the cluster was
    working.




14. Suspended/Resumed the server hosts alternatively as part of the overall testing.



Resources
A good Microsoft reference to troubleshoot Network Load Balancing clusters is available at the following link:
http://technet.microsoft.com/en-us/library/cc732592.aspx




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    Quick Reference                                                                      NLB Setup & Configuration

Copyright 2010 by eWorldTree, LLC. Some Rights Reserved.
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