How to change DNS or URL of a MOSS 2007 site ?

Scenario:
I developed a sharpoint site on server[server1] having default URL "http://server1:1515/sites/site1". Sharepoint server machine is member of a domain xyz.com. End user of this intranet site is member of another domain in the intranet. When user is trying to browse this intranet site FQDN [http://server1.xyz.com:1515/sites/site1], then s/he is getting sharepoint error saying "File not found".

Solution:

• Open Sharepoint Central Admin & go to Operations tab
• Under Global configuration heading select Alternate access mappings.
• Select the desired web application i.e. http://server1:1515 (in this example)
• On Edit Internal URLs page set the change the value of "http://server1:1515" to "http://server1.xyz.com:1515".
• Now this site[http://server1.xyz.com:1515] will be accessible throughout the intranet from any domain.