/usr/share/freeradius/dictionary.fdxtended is in freeradius-common 2.2.8+dfsg-0.1ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15  | VENDOR		fdXtended			34536
BEGIN-VENDOR	fdXtended
ATTRIBUTE	fdXtended-Bandwidth-Up			1	integer
ATTRIBUTE	fdXtended-Bandwidth-Down		2	integer
ATTRIBUTE	fdXtended-PostAuthURL			3	string
ATTRIBUTE	fdXtended-One2onenat-IP			4	string
ATTRIBUTE	fdXtended-ContentFilter			5	integer
ATTRIBUTE	fdXtended-NetworkPolicy			6	integer
ATTRIBUTE	fdXtended-BytesDown			7	integer
ATTRIBUTE	fdXtended-BytesUp			8	integer
ATTRIBUTE	fdXtended-Expiration			9	string
ATTRIBUTE	fdXtended-SessionTimeout		10	integer
ATTRIBUTE	fdXtended-Wan-Interface			11	string
END-VENDOR fdXtended
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