I have a site that is actually a tumblr account for a client. I need to set it to that: blog.foo.net actually redirects to blah.tumblr.com, while still using blog.foo.net. This would be simple using GoDaddy's control panel, but this isn't possible with the control panel in use by the client, which only allows me to create a blog.foo.net and point it to one of my own webservers. My workplace only has Windows 2008 R2 servers.
I keep finding information on URL Rewrite, but how do I get URL Rewrite to do what I need here? I just need to forward the blog.foo.net to blah.tumblr.com without losing the URL.