Issue: Exchange 2010 CAS NLB configuration - netsh

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Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Configuring NLB for Exchange 2010 CAS Load Balancing

Next Steps

Before you start using your new NLB cluster for CAS functionality, you should complete two final tasks.  First, IP forwarding should be enabled on each cluster member’s NLB LAN NIC.  By default, Windows 2008 disables IP forwarding, which causes problems with NLB.  IP forwarding enabled allows, from an NLB perspective, requests sent from one NIC to be sent out the other.  IP forwarding can be enabled on your NLB LAN NIC by running netsh interface ipv4 set int “NLB LAN” forwarding=enabled from a command prompt.

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netsh interface show int

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  • That will show you the interfaces in the server.  Find the name of the cluster NIC and put it in quotes in the following command:
    • netsh interface ipv4 set interface "Cluster NIC" forwarding=enabled

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  • You can confirm that it is changed by running the command:
    • netsh interface ipv4 show interface l=verbose

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