Ruby on Rails

Not sure I understand all of this but

As long as you can send some-new-app.com to your IP address and some-old-app.com to the same address it should not be a problem

You could use a CNAME record to forward both of these to myrouter.asuscomm.com which is your actual device

Once it gets there I assume you forward the traffic to your web host where it should still be receiving requests (Host: headers)  for some-old-app.com and some-new-app.com.

Then your web server should be directing the traffic to the correct rails app

It's a bit difficult to diagnose without more information but hopefully this is a pointer

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