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In environments where the NetScaler appliance is deployed, external clients (Source IPs) communicate via the NetScaler appliance to access applications hosted on the servers (Destination IPs). The NetScaler appliance is deployed in front of the web or database servers and routes requests to the servers from the external clients through it. When multiple servers are responding to the requests received from the clients through the NetScaler device, it is impossible for the administrators to keep track of which server is sending the maximum amount of data to the clients while responding to the requests. In order to identify the topmost servers that are contributing to the maximum data transfer between the server and the client, adminsitrators can use the NSTopDesTest test.

This test dynamically lists the top servers and for each server reports the amount of data sent from the server to the client and amount of data received by the server from the client. By comparing the measures reported by this test, administrators can identify the topmost server (Destination IP) in terms of data transfer.

For this test to run and report metrics, the NetScaler device should be configured to create a Syslog file in a remote Syslog server, where the details of all interactions with the NetScaler appliance will be logged. To know how to configure the Syslog server where this Syslog file should be created, Click Here,

Outputs of the test : One set of results for each Destination IP address configured on the target Citrix NetScaler

Measurement	Description	Measurement Unit	Interpretation
des_byte_sent	Indicates the total amount of data sent from this destination IP to the source IP.	KB	Compare the value of this measure across the destination IP addresses to know which destination IP address is sending the maximum amount of data. The detailed diagnosis of this measure if enabled, lists the Destination IP, Source IP, start time, End time, total byte sent and the total byte received.
des_byte_recv	Indicates the total amount of data received by this destination IP from the source IP.	KB	Compare the value of this measure across the destination IP addresses to know which destination IP address is receiving the maximum amount of data. The detailed diagnosis of this measure if enabled, lists the Destination IP, Source IP, start time, End time, total byte sent and the total byte received.