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Alternate access mappings tell SharePoint how to map web requests to the correct web applications and sites so that SharePoint can serve the correct content back to you, translating the URLs properly in the process.
Manage alternate access mappings
- On the SharePoint Central Administration website, click System Settings.
- On the System Settings page, in the Farm Management section, click Configure alternate access mappings.
How to configure alternate access mappings in SharePoint?
Click the Configure alternate access mappings link under Application Management. In the Alternate Access Mappings page, click on the Edit Public URLs link. On the Edit Public Zone URLs page, make sure that you select the correct web application that you want to configure for alternate access mappings.
How to change the alternate access mapping collection?
On the Alternate Access Mappings page, click Edit Public URLs. If the mapping collection that you want to change is not specified, then choose one. In the Alternate Access Mapping Collection section, on the Alternate Access Mapping Collection menu, click Change alternate access mapping collection.
How to define mappings for resources outside the intranet?
You can also define mappings for resources outside intranet applications. To do so, you must supply a unique name, initial URL, and a zone for that URL. (The URL must be unique to the farm.) On the Alternate Access Mappings page, click Map to External Resource.
How many mappings can a web application support?
Each web application supports five collections of mappings per URL. The five collections correspond to five zones (default, intranet, extranet, Internet, and custom). When the web application receives a request for an internal URL in a particular zone, links on the pages returned to the user have the public URL for that zone.