We are in the process of developing a .NET based IIS hosted web application as part of a re-platforming project. The original web app is on a Netscape server, in the process of migration we need to point the dns to the IIS server so that the requests are responded by IIS. at the same time we would still need the Netscape server so as to redirect the users from the IIS web app for the regions of the web site which the new application doesn't process (yet).
The old application is frame based, so we plan on using IFrames in the content area (of a master page in web client software factory) and use a URL rewrite engine to render pages from the old system in the iframe.
We also need to point the DNS entry which currently points to the Netscape server to IIS.
Are there and best practices for the above activities?