Two physical servers with sql server on same network IS there a way I can remotely access sql server DB having two different servers in the same network/public IP? 

The first Server is configured to listen to 1433 port but we make the connections using No-Ip provider. 

As both servers will be under the same DNS, how can I configure my app/sql server to connect to the DB in the second server?
Solved that by changing SQL port on SQL Server Configuration Manager, but you'll always have to specify the port for every connections that is different from the standard 1433 port. If you have an APP, you'll also have to change the connection string method to set up a different port or work the code to get it from an external file.