ndp(8) on OpenBSD
The text f4b3cbc62b5f, as OpenBSD 2.7 shipped it.
control/diagnose IPv6 neighbor discovery protocol
Flags it lists
-
-A -
-H -
-P -
-R -
-a -
-c -
-d -
-f -
-l -
-n -
-p -
-r -
-s -
-t