Redirecting without change of address in browser address bar

I have a different but similar question. I have a dynamic dns account where I map my machine's dynamic IP to an address say, www.xxx.yyy.net

Now, I have registered another short domain name say www.yyy.com, the hosting is on a linux server.

Now, my machine is actually a webserver which runs .net website which can be accessed by www.xxx.yyy.net I need my homepage(i开发者_运维问答ndex.php) in my www.yyy.com handle the redirection in a way that the pages to be loaded from www.xxx.yyy.net/.... but it should look in the browser as www.yyy.com/...

Is there any way to do this using php?

I dont think there is an easy way. If you are using Apache you can write a .htaccess with some rewrite rule in it to to a transparent redirect.