Here is a quick and easy way to set up your Alternate Access Mappings.
- Open SharePoint Central Administration
- Click “Operations”
- Click “Alternate Access Mappings”
- Choose the correct Alternate Access Mappings Collection (This Changes your Web App)
- Click “Edit Public URLs”
- The “Default” URL should be your fully qualified URL (ex: http://mysite.com)
- The “Intranet” URL should be your short/friendly URL (ex: http://mysite)
- The “Internet” URL should be the IP address associated with your portal. (ex: http://10.34.132.43)
- If you have more than 1 front end in the farm, you can add the IPs to the “Custom” or “Extranet” fields
- Now ensure that your DNS Entries and your Host Headers are set up correctly.
The above method is the way that I set up my alternate access mappings. There are many different ways this can be configured, but I have found that this works for pretty much all of the common routing scenarios.