>Is it possible to set up in IIS that a URL would be redirected to another URL?
>
>For example, when user enters URL http:\Server1\Site1\page.aspx to be automatically redirected to http:\Server2\Site2\page.aspx?

Yes, this is possible.

I assume you have IIS 7.5 or more. There is an option "HTTP Redirect" from the main pane. In there, you can define your references for redirection.