ndp(8) on OpenBSD
The text 61d2f450064d, as OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9 shipped it.
control/diagnose IPv6 neighbor discovery protocol
Flags it lists
-
-A -
-H -
-P -
-R -
-a -
-c -
-d -
-f -
-n -
-p -
-r -
-s -
-t