Hi,
  I've attached a patch for adding configtest option for ospfd/ospf6d.

OK?

Index: ospf6d
===================================================================
RCS file: /cvs/src/etc/rc.d/ospf6d,v
diff -u -p -r1.3 ospf6d
--- ospf6d	11 Jan 2018 19:52:12 -0000	1.3
+++ ospf6d	24 Feb 2024 14:25:53 -0000
@@ -6,4 +6,8 @@ daemon="/usr/sbin/ospf6d"
 
 . /etc/rc.d/rc.subr
 
+rc_configtest() {
+	${daemon} ${daemon_flags} -n
+}
+
 rc_cmd $1
Index: ospfd
===================================================================
RCS file: /cvs/src/etc/rc.d/ospfd,v
diff -u -p -r1.3 ospfd
--- ospfd	11 Jan 2018 19:52:12 -0000	1.3
+++ ospfd	24 Feb 2024 14:25:53 -0000
@@ -6,4 +6,8 @@ daemon="/usr/sbin/ospfd"
 
 . /etc/rc.d/rc.subr
 
+rc_configtest() {
+	${daemon} ${daemon_flags} -n
+}
+
 rc_cmd $1