This is not just DNS, you have make sure the name servername and helpdesk are pointing to the IIS server (assuming you have just one IIS, you have two, point them to the according ones).
After that you need to configure the IIS to redirect a page (http://servername:88/ that will be listening on port 88 on IIS) to another URL (http://helpdesk/)
Here is a website with how to do the redirect on IIS:
http://www.microsoft.com/t
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by: mikeewaltonPosted on 2009-09-01 at 13:28:45ID: 25235660
You do this with bindings in IIS
om/en-us/l ibrary/ cc7 31692(WS.1 0).aspx
net/suppor t/kb/defau lt.asp?id= 1472
http://technet.microsoft.c
http://hosting.intermedia.