/usr/share/freeradius/dictionary.lantronix is in freeradius-common 3.0.12+dfsg-5+deb9u1.
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 | # dictionary.lantronix
#
# Lantronix SLC Secure Lantronix Console Manager
# Provides SLC-specific user attributes
#
VENDOR Lantronix 244
BEGIN-VENDOR Lantronix
ATTRIBUTE Lantronix-User-Attributes 1 string
END-VENDOR Lantronix
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