To redirect to a specific SharePoint site or page:
1. Create c-name entry in DNS and point to SharePoint server
2. Create directory in c:\inetpub\wwwroot and create one html file called "index.htm" in the folder with this content:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=http://sharepoint/sites/default.aspx">
3. Open IIS and create a new Web site. The port is the same as the default Web application. Fill in a host header value- make it the same as you specified in the c-name entry. Also, add a host header for the FQDN. Specify the Home Directroy as the same folder that was created in step one.
4. Start the Web site in IIS.