dhcrelay(8) on OpenBSD
The text 7842825b2eb0, as OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4 shipped it.
Dynamic Host Configuration Protocol relay agent
Flags it lists
-
-d -
-i -
-o