The suggestion about using your firewall or network switch configuration is the best way to achieve this.
One way to think of the TCP address and port numbers is to think of your home.
Your home can have a number of different addresses. You can call it 'Willow Cottage', '143 Shady Lane', '2nd house after the pub'. These all relate to TCP addresses, and people can find your house by any of these addresses.
Inside your house you have rooms. These relate to port numbers. If you have something that needs a room to itself (e.g. a teenager or a SQL Server instance), you cannot make it share with another instance of the same thing.
The firewall or other address translation tool allows you to have a level of indirection between what the application servers know about your SQL Server machine and the reality of what actually runs on your SQL Server machine.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 14 Mar 2017
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