diff --git a/kame/sys/net/if_sec.c b/kame/sys/net/if_sec.c
index e846ec1627..d0b3635129 100644
--- a/kame/sys/net/if_sec.c
+++ b/kame/sys/net/if_sec.c
@@ -1,4 +1,4 @@
-/*	$KAME: if_sec.c,v 1.13 2001/07/27 18:45:13 itojun Exp $	*/
+/*	$KAME: if_sec.c,v 1.14 2001/07/28 03:09:39 itojun Exp $	*/
 
 /*
  * Copyright (C) 2001 WIDE Project.  All rights reserved.
@@ -231,6 +231,9 @@ sec_establish(psrc, pdst)
 		}
 	}
 
+	/* bring the interface up, we are willing to receive traffic */
+	if_up(ifp);
+
 	((struct sec_softc *)ifp)->sc_refcnt++;
 	return ifp;
 }