- Some bugs were fixed in the 'emergency relay agent options hologram'

which is used to retain relay agent option contents from when the
  client was in INIT or REBIND states.  This should solve problems where
  relay agent options were not echoed from the server, even when giaddr
  was set.  [ISC-Bugs #16787]

includes/dhcpd.h

@@ -347,6 +347,12 @@ struct packet {
 
 	int known;
 	int authenticated;
+
+	/* If we stash agent options onto the packet option state, to pretend
+	 * options we got in a previous exchange were still there, we need
+	 * to signal this in a reliable way.
+	 */
+	isc_boolean_t agent_options_stashed;
 };
 
 /* A network interface's MAC address. */