Sorry I'm not man enough...err savvy enough to know the man page ways
to write the needed lingo.
Could somebody update the man page for route with the following gist:
In a change or add command where the destination and gateway are not suf-
ficient to specify the route, the -ifp or -ifa modifiers may be used to
determine the interface or interface address.
+ -ifa specifies an interface by its IP address (not name).
+
+ -ifp specifies an interface by name and link layer address:
+
+ -ifp interface name:link layer address
+
+ example:
+
+ route add 192.1.2.3 10.10.0.34 -ifp em0:08:00:69:ff:ff:ff
dmo
