Index: sys/net/ethernet.h
===================================================================
--- sys/net/ethernet.h
+++ sys/net/ethernet.h
@@ -406,6 +406,12 @@
 	    void *, u_int);
 struct mbuf  *ether_vlanencap(struct mbuf *, uint16_t);
 
+#ifdef _SYS_EVENTHANDLER_H_
+/* new ethernet interface attached event */
+typedef void (*ether_ifattach_event_handler_t)(void *, struct ifnet *);
+EVENTHANDLER_DECLARE(ether_ifattach_event, ether_ifattach_event_handler_t);
+#endif
+
 #else /* _KERNEL */
 
 #include <sys/cdefs.h>
Index: sys/net/if_ethersubr.c
===================================================================
--- sys/net/if_ethersubr.c
+++ sys/net/if_ethersubr.c
@@ -38,6 +38,8 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/eventhandler.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
@@ -931,6 +933,11 @@
 		if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
 
 	uuid_ether_add(LLADDR(sdl));
+
+	/* Add necessary bits are setup; announce it now. */
+	EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
+	if (IS_DEFAULT_VNET(curvnet))
+		devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
 }
 
 /*