radsniff(8) on Linux
The text 599e491eb822, as Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
dump radius protocol
Flags it lists
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-F -
-I -
-S -
-c -
-d -
-f -
-h -
-i -
-m -
-p -
-r -
-s -
-w -
-x