We have a client that uses a DNS CNAME to forward internal requests for example.client.com from their server to our server at redirect.host.com. Our server is an IIS 6.0 server.
Should the redirect be allowed in by IIS on our server? Or is there a list of allowed IPs somewhere, where we can restrict the IPs that redirect to this site?
The client mentioned updating host headers, but I am not aware of how to do this.
Any help appreciated.