As you may or may not know, redirects were added into the CMS as a feature starting in version 8.6. If you're running a version that's older than that, the method of redirecting aliases isn't clear.
So how can you set up alias redirects?
Unfortunately, there isn't a direct way to do this 'out-of-the-box'. In versions prior to 8.6, the way to set up redirects was through IIS.
The element you'll want to utilize is httpRedirect. With this, you'll need to set only the enabled and destination attributes in order to redirect your site visitors to a new location.
The complete article is included down in the References and Links section which includes step by step setup methods, sample code, and other important details.