Default vs Inner-tunnel concepts

[Tom Yard]

Dear, I want to use eap with TLS authentication in Freeradius.

At this moment, I've setup both default and inner.-tunnel files, and
everything works OK.

Am I right or do I have to use just inner-tunnel file?

Please can you help me in this concept?

Because I think if I have to use eap with TLS, I have to edit default and
inner tunnel files, but maybe I'm wrong and I just have to edit
inner-tunnel file and let default file as it comes from package
installation.

Special thanks,

TOM