radsniff(8) on Linux
The text 0f84601ed1a4, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
dump radius protocol
Flags it lists
-
-F -
-I -
-R -
-S -
-c -
-d -
-f -
-h -
-i -
-m -
-p -
-r -
-s -
-w -
-x