diff --git a/TODO b/TODO
index 3f7db5cd..5ba0433b 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,5 @@
 Core
 ~~~~
-- debug: interfaces
 - debug: static
 - debug: pipe
 - debug: krt
diff --git a/nest/config.Y b/nest/config.Y
index a4863dd2..f4e8cdd7 100644
--- a/nest/config.Y
+++ b/nest/config.Y
@@ -19,7 +19,7 @@ CF_DECLS
 
 CF_KEYWORDS(ROUTER, ID, PROTOCOL, PREFERENCE, DISABLED, DEBUG, ALL, OFF, DIRECT)
 CF_KEYWORDS(INTERFACE, IMPORT, EXPORT, FILTER, NONE, TABLE, STATES, ROUTES, FILTERS)
-CF_KEYWORDS(PASSWORD, FROM, PASSIVE, TO, ID, EVENTS, PACKETS, PROTOCOLS)
+CF_KEYWORDS(PASSWORD, FROM, PASSIVE, TO, ID, EVENTS, PACKETS, PROTOCOLS, INTERFACES)
 
 CF_ENUM(T_ENUM_RTS, RTS_, DUMMY, STATIC, INHERIT, DEVICE, STATIC_DEVICE, REDIRECT,
 	RIP, RIP_EXT, OSPF, OSPF_EXT, OSPF_IA, OSPF_BOUNDARY, BGP, PIPE)
@@ -177,6 +177,7 @@ debug_flag:
    STATES	{ $$ = D_STATES; }
  | ROUTES	{ $$ = D_ROUTES; }
  | FILTERS	{ $$ = D_FILTERS; }
+ | INTERFACES	{ $$ = D_IFACES; }
  | EVENTS	{ $$ = D_EVENTS; }
  | PACKETS	{ $$ = D_PACKETS; }
  ;
diff --git a/nest/iface.c b/nest/iface.c
index 4fa2c72e..cf91833b 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -6,7 +6,7 @@
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
-#define LOCAL_DEBUG
+#undef LOCAL_DEBUG
 
 #include "nest/bird.h"
 #include "nest/iface.h"
@@ -99,15 +99,44 @@ if_copy(struct iface *to, struct iface *from)
   to->mtu = from->mtu;
 }
 
+static inline void
+ifa_send_notify(struct proto *p, unsigned c, struct ifa *a)
+{
+  if (p->ifa_notify)
+    {
+      if (p->debug & D_IFACES)
+	log(L_TRACE "%s < %s address %I/%d on interface %s %s",
+	    p->name, (a->flags & IA_PRIMARY) ? "primary" : "secondary",
+	    a->prefix, a->pxlen, a->iface->name,
+	    (c & IF_CHANGE_UP) ? "added" : "removed");
+      p->ifa_notify(p, c, a);
+    }
+}
+
 static void
 ifa_notify_change(unsigned c, struct ifa *a)
 {
   struct proto *p;
 
-  debug("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
+  DBG("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
   WALK_LIST(p, active_proto_list)
-    if (p->ifa_notify)
-      p->ifa_notify(p, c, a);
+    ifa_send_notify(p, c, a);
+}
+
+static inline void
+if_send_notify(struct proto *p, unsigned c, struct iface *i)
+{
+  if (p->if_notify)
+    {
+      if (p->debug & D_IFACES)
+	log(L_TRACE "%s < interface %s %s", p->name, i->name,
+	    (c & IF_CHANGE_UP) ? "goes up" :
+	    (c & IF_CHANGE_DOWN) ? "goes down" :
+	    (c & IF_CHANGE_MTU) ? "changes MTU" :
+	    (c & IF_CHANGE_CREATE) ? "created" :
+	    "sends unknown event");
+      p->if_notify(p, c, i);
+    }
 }
 
 static void
@@ -122,7 +151,7 @@ if_notify_change(unsigned c, struct iface *i)
       c |= IF_CHANGE_CREATE | IF_CHANGE_MTU;
     }
 
-  debug("Interface change notification (%x) for %s\n", c, i->name);
+  DBG("Interface change notification (%x) for %s\n", c, i->name);
   if_dump(i);
 
   if (c & IF_CHANGE_UP)
@@ -135,8 +164,7 @@ if_notify_change(unsigned c, struct iface *i)
       }
 
   WALK_LIST(p, active_proto_list)
-    if (p->if_notify)
-      p->if_notify(p, c, i);
+    if_send_notify(p, c, i);
 
   if (c & IF_CHANGE_UP)
     WALK_LIST(a, i->addrs)
@@ -261,16 +289,15 @@ if_feed_baby(struct proto *p)
   struct iface *i;
   struct ifa *a;
 
-  if (!p->if_notify && !p->ifa_notify)
+  if (!p->if_notify && !p->ifa_notify)	/* shortcut */
     return;
-  debug("Announcing interfaces to new protocol %s\n", p->name);
+  DBG("Announcing interfaces to new protocol %s\n", p->name);
   WALK_LIST(i, iface_list)
     {
-      if (p->if_notify)
-	p->if_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
-      if (p->ifa_notify && (i->flags & IF_UP))
+      if_send_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
+      if (i->flags & IF_UP)
 	WALK_LIST(a, i->addrs)
-	  p->ifa_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
+	  ifa_send_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
     }
 }
 
@@ -399,7 +426,7 @@ auto_router_id(void)
       j = i;
   if (!j)
     die("Cannot determine router ID (no suitable network interface found), please configure it manually");
-  debug("Guessed router ID %I (%s)\n", j->addr->ip, j->name);
+  log(L_INFO, "Guessed router ID %I according to interface %s", j->addr->ip, j->name);
   config->router_id = ipa_to_u32(j->addr->ip);
 #endif
 }
diff --git a/nest/protocol.h b/nest/protocol.h
index f4ce3843..9dd32fc4 100644
--- a/nest/protocol.h
+++ b/nest/protocol.h
@@ -240,9 +240,10 @@ void proto_notify_state(struct proto *p, unsigned state);
 
 #define D_STATES 1		/* [core] State transitions */
 #define D_ROUTES 2		/* [core] Routes passed by the filters */
-#define D_FILTERS 4		/* [core] Filtering of routes */
-#define D_EVENTS 8		/* Protocol events */
-#define D_PACKETS 16		/* Packets sent/received */
+#define D_FILTERS 4		/* [core] Routes rejected by the filters */
+#define D_IFACES 8		/* [core] Interface events */
+#define D_EVENTS 16		/* Protocol events */
+#define D_PACKETS 32		/* Packets sent/received */
 
 /*
  *	Known unique protocol instances as referenced by config routines