Setting Framed-MTU in Freeradius

[Kat]

Gday,

Google Gemini is insisting quite strongly that, after changing fragment 
size in the /etc/raddb/mods-enabled/eap, I also need to put something in 
the post-auth part.

The problem is that sometimes AI can be wrong and I cannot find 
alternate sources that back this claim up. My Google-fu may be weak.

Google Gemini wants me to copy and paste this snippet:

post-auth {
     update reply {
         Framed-MTU := 1024
     }
}


into /etc/raddb/sites-enabled/default in the post-auth section. Gemini 
points to a comment block that says: "# Please do not put "unlang" 
configurations into the "authenticate"
# section. Put them in the "post-auth" section instead. That's what
# the post-auth section is for."


is Google Gemini correct? Does this belong in the post-auth and is 
perfectly fine to do?

In a previous email, 
https://lists.freeradius.org/pipermail/freeradius-users/2022-March/101630.html, 
  to this list, it sounds like it could be in sites-available/default

Aren't they symlinks?

I can't find anything specific to comment or uncomment, and I would have 
thought it would have been there, as an example. This makes me hesitant. 
The example is for a State attribute when I want to set a configuration. 
Even if the syntax is the same.

So it would look like this:
#  Post-Authentication
#  Once we KNOW that the user has been authenticated, there are
#  additional steps we can take.
post-auth {
	#
	#  If you need to have a State attribute, you can
	#  add it here.  e.g. for later CoA-Request with
	#  State, and Service-Type = Authorize-Only.
	#
#	if (!&reply:State) {
#		update reply {
#			State := "0x%{randstr:16h}"
#		}
#	}

	update reply {
         	Framed-MTU := 1024
     	}


Yay or Nay?

Kat