nfreplay(1) on Linux
The text 533f05a40f60, as Debian 5.0 (Lenny) shipped it.
netflow replay program
Flags it lists
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-4 -
-6 -
-H -
-V -
-b -
-c -
-d -
-h -
-j -
-p -
-r -
-t -
-v