I was asked this question today and tried the following solution which seemed the simplest.
- Create a shared folder on each Web Front (WFE) Server.
Name it the name of the server (or a friendly name you want to use to identify a server e.g. WFE01) and grant it full read rights to"everyone".
- Open the URL, e.g. Http://intranet.stealth.com in the browser as normal and let the page load.
- Now open file explorer and put the same URL (without http://) you normally access the load balancer with e.g. \\intranet.stealth.com
You should now see a folder share which should show you the shared folder representing the server name.
This is the server you are being directed to by the load balancer.
NB: This will only work if you have network or single affinity configured on the NLB.
This will give you a starting point to troubleshoot issues i.e. Performance or erratic behavior with multiple WFE's.