How to set PTR

I set in my DNS(win2k3) a CNAME name to have a subdomain on my domain. Then another server that is running on win2k3 with IIS has redirection to another server(linux) just for that subdomain.
Now when I access the sudomain through browser it redirects me to the server that i intended but the address in the browser is replaced with IP of that server where that subdomain is. How can i set DNS so that the name stayes instead of changing into server's IP ?

 

 

 

 

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