.Pp
The following options are available:
.Bl -tag -width indent
+.It Fl d
+Run in debug-only mode, i.e., do not actually modify the routing table.
.It Fl n
Bypass attempts to print host and network names symbolically
when reporting actions. (The process of translating between symbolic
names and numerical equivalents can be quite time consuming, and
may require correct operation of the network; thus it may be expedient
to forget this, especially when attempting to repair networking operations).
+.It Fl t
+Run in test-only mode.
+.Pa /dev/null
+is used instead of a socket.
.It Fl v
(verbose) Print additional details.
.It Fl q
itself may be given, in which case the route remains valid even
if the local or remote addresses change.
.Pp
-For AF_INET, the
+For AF_INET and AF_INET6, the
.Fl ifscope
modifier specifies the additional property of the route related to
the interface scope derived from interface