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[Archive] Using DX to load balance client connections between two target servers when load balancing Steel Belted Radius (SBR) Authentication.

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Summary:
Using DX to load balance client connections between two target servers when load balancing Steel Belted Radius Authentication.
Symptoms:
Unable to load balance client connections when using two Target Servers within the Server Load Balancer (SLB) group after hard pausing one of the targets for maintenance.
Cause:

Solution:
The client connections (active sessions) to a DX SLB group when load balancing Steel Belted Radius Authentication are the Network Attached Storage (NAS) devices.

In order to load balance evenly between the target servers (hosts) you must set both targets to hard paused and then set them both back to unpaused at the same time using the "WebUI select all" feature. Unpausing the target servers one at a time will result in one target server (host) processing all the traffic, while the other never takes any traffic unless the other target server goes down. All client connections from the NAS devices are created instantly once the target servers are available and if one target server is available before the other it will take all the of the client connections.

One other solution would be to set a max limit on each target server, however you will need to remember to change this number when you are adding NAS devices or lower the number when you add additional target servers. It is best just to hard pause all target servers and then unpause all target servers to verify proper load balancing of the client (NAS) connections and selecting round robin as the load balance algorithm.

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