Thanks 'anonymous',
I read through that post once again.  However, this is no mention of how to do this in the 
Airport Extreme.  I can't find anywhere in the menus where I can direct the data to the DVR.  
I am trying to understand this but there is a lot of information here.  So much, I don't really know what it means or what may apply to my situation.  
Simply put, I have a DVR hooked straight to my router (no computer).  My MAC router does not show an IP address.  It shows a MAC address.  This is not covered in the posted link.  
Is there anyone else...anonymous or not that can shed more light?
Best,
E.