Netscaler Exchange 2010 SMTP load balancing
I've been looking for a way to make our NetScalers load balance the SMTP traffic to our Exchange 2010 environment. Here's a blog posting which shows you how to do it. http://citrix.stefanriek.de/citrix/howto-load-balance-while-preserving-a-clients-source-ip-but-not-using-the-netscaler-as-your-gateway/ Basically you need to make a new service group with ANY as the protocol on which you have enabled USIP. Then in the Virtual Server (again protocol ANY) you select the service group and enable MAC redirection. Here is the kicker. You now need to edit your Exchange server! Well you need to add a loopback adapter with the IP of the Virtual Server in NetScaler. Then enable weakhost receive and send on the loopback adapter and enable weakhost receive on the live adapter. netsh interface ipv4 set interface "Your production network adaptor name" weakhostreceive=enabled netsh interface ipv4 set interface "Your loopback network adaptor name" weakhostrecei