How to populate sender username information generated by the network monitor servers

Products

• Data Loss Prevention Core Package

Issue/Introduction

The sender information generated by the network monitor servers is seem as the ip address. 
Is there a definition that can be made for this part to appear as username?

Environment

Release : 15.8

Resolution

Please ensure the below has been configures i.e.

Go to System > Servers and Detectors > Logs > configuration tab you will need to configure the Enforce Server to start collecting the "Custom Attribute Lookup Logging". 

Click on System > Incident Data > Lookup Plugins > Lookup Parameters button

Select the Incident and sender parameters

Save the settings