80 Domain Name For Local Server New

Can someone please guide me on how to obtain the domain name of the servers remotely.
Domain name for local server. The reason that is given for the change is that the internal server names are not unique and therefore easy to falsify. We will walk you through steps that need to be taken to the setup domain name on your linux server. I need to get the domain name for hunderds of servers.
The ad domain name is not the same as the dns name but they are linked. I have a webserver running on ubuntu server on my local network. Run your own dns server and tell your router to use it as the default resolver for your network.
First of all check if your server is having domain name already set up or not using below command. Get a public domain name. For such a scenario you have to configure the domain name for your linux server.
If you go with local as of november 2015 you will not be able to get an ssl certificate with the subject alternative name to include the local netbios name of the exchange server. The server itself may only be accessible inside your network but the dns will be available anywhere. This technique is a little bit easier than method one.
Is there a router that can do this or do i have to set up a local dns server. Ad domain names are mainly used within ad operations mostly ldap queries for ad functionality while dns is rather a network level solution for name resolution on ip level to resolve the machines or application names to ip addresses. Change localhost to domain name in window ad your favorite domain name method two.
Any help would be highly appreciated.