diff --git a/core/net/rime/collect.c b/core/net/rime/collect.c
index 951c5e8b1..0cc831e84 100644
--- a/core/net/rime/collect.c
+++ b/core/net/rime/collect.c
@@ -36,7 +36,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: collect.c,v 1.13 2008/07/03 22:02:10 adamdunkels Exp $
+ * $Id: collect.c,v 1.14 2008/08/15 19:00:38 adamdunkels Exp $
  */
 
 /**
@@ -68,7 +68,7 @@ static const struct rimebuf_attrlist attributes[] =
     RIMEBUF_ATTR_LAST
   };
 
-#define NUM_RECENT_PACKETS 4
+#define NUM_RECENT_PACKETS 2
 
 struct recent_packet {
   rimeaddr_t originator;
@@ -115,12 +115,18 @@ update_rtmetric(struct collect_conn *tc)
       }
       tc->rtmetric = RTMETRIC_MAX;
     } else {
-
       /* We set our rtmetric to the rtmetric of our best neighbor plus
 	 the expected transmissions to reach that neighbor. */
       if(n->rtmetric + neighbor_etx(n) != tc->rtmetric) {
-	tc->rtmetric = n->rtmetric + neighbor_etx(n);
-	neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
+	uint16_t new_rtmetric = n->rtmetric + neighbor_etx(n);
+	
+	if(tc->rtmetric == RTMETRIC_MAX) {
+	  neighbor_discovery_start(&tc->neighbor_discovery_conn, new_rtmetric);
+	} else {
+	  neighbor_discovery_set_val(&tc->neighbor_discovery_conn, new_rtmetric);
+	}
+	tc->rtmetric = new_rtmetric;
+
 	PRINTF("%d.%d: new rtmetric %d\n",
 	       rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
 	       tc->rtmetric);
@@ -156,8 +162,13 @@ node_packet_received(struct runicast_conn *c, rimeaddr_t *from, uint8_t seqno)
 
   for(i = 0; i < NUM_RECENT_PACKETS; i++) {
     if(recent_packets[i].seqno == rimebuf_attr(RIMEBUF_ATTR_EPACKET_ID)&&
-	  rimeaddr_cmp(&recent_packets[i].originator,
-		       rimebuf_addr(RIMEBUF_ADDR_ESENDER))) {
+       rimeaddr_cmp(&recent_packets[i].originator,
+		    rimebuf_addr(RIMEBUF_ADDR_ESENDER))) {
+      PRINTF("%d.%d: collect: dropping duplicate packet %d from %d.%d\n",
+	     rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
+	     rimebuf_attr(RIMEBUF_ATTR_EPACKET_ID),
+	     rimebuf_addr(RIMEBUF_ADDR_ESENDER)->u8[0],
+	     rimebuf_addr(RIMEBUF_ADDR_ESENDER)->u8[1]);
       /* Drop the packet. */
       return;
     }
@@ -284,7 +295,7 @@ collect_open(struct collect_conn *tc, uint16_t channels,
   channel_set_attributes(channels + 1, attributes);
   tc->rtmetric = RTMETRIC_MAX;
   tc->cb = cb;
-  neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
+  neighbor_discovery_set_val(&tc->neighbor_discovery_conn, tc->rtmetric);
 }
 /*---------------------------------------------------------------------------*/
 void
@@ -331,6 +342,9 @@ collect_send(struct collect_conn *tc, int rexmits)
 #if NETSIM
       ether_set_line(n->addr.u8[0], n->addr.u8[1]);
 #endif /* NETSIM */
+      PRINTF("%d.%d: sending to %d.%d\n",
+	     rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
+	     n->addr.u8[0], n->addr.u8[1]);
       return runicast_send(&tc->runicast_conn, &n->addr, rexmits);
     } else {
       /*      printf("Didn't find any neighbor\n");*/
diff --git a/core/net/rime/neighbor-discovery.c b/core/net/rime/neighbor-discovery.c
index ed5c3dbae..e54b7aa39 100644
--- a/core/net/rime/neighbor-discovery.c
+++ b/core/net/rime/neighbor-discovery.c
@@ -33,7 +33,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: neighbor-discovery.c,v 1.9 2008/07/09 09:33:58 adamdunkels Exp $
+ * $Id: neighbor-discovery.c,v 1.10 2008/08/15 19:00:38 adamdunkels Exp $
  */
 
 /**
@@ -115,7 +115,7 @@ adv_packet_received(struct broadcast_conn *ibc, rimeaddr_t *from)
   /* If we receive an announcement with a lower value than ours, we
      cancel our own announcement. */
   if(msg->val < c->val) {
-    ctimer_stop(&c->t);
+    ctimer_stop(&c->send_timer);
   }
   
   if(c->u->recv) {
@@ -128,10 +128,9 @@ send_timer(void *ptr)
 {
   struct neighbor_discovery_conn *tc = ptr;
 
-  /*  send_adv(tc, tc->max_interval);*/
-  ctimer_set(&tc->t,
+  ctimer_set(&tc->send_timer,
 	     tc->max_interval / 2 + random_rand() % (tc->max_interval / 2),
-	     send_timer, tc);
+	     send_adv, tc);
   ctimer_set(&tc->interval_timer,
 	     tc->max_interval,
 	     send_timer, tc);
@@ -152,14 +151,20 @@ neighbor_discovery_open(struct neighbor_discovery_conn *c, uint16_t channel,
   c->initial_interval = initial;
   c->min_interval = min;
   c->max_interval = max;
-  ctimer_set(&c->interval_timer, max, send_timer, c);
 }
 /*---------------------------------------------------------------------------*/
 void
 neighbor_discovery_close(struct neighbor_discovery_conn *c)
 {
   broadcast_close(&c->c);
-  ctimer_stop(&c->t);
+  ctimer_stop(&c->send_timer);
+  ctimer_stop(&c->interval_timer);
+}
+/*---------------------------------------------------------------------------*/
+void
+neighbor_discovery_set_val(struct neighbor_discovery_conn *c, uint16_t val)
+{
+  c->val = val;
 }
 /*---------------------------------------------------------------------------*/
 void
@@ -173,7 +178,8 @@ neighbor_discovery_start(struct neighbor_discovery_conn *c, uint16_t val)
     interval = c->min_interval;
   }
   c->val = val;
-  ctimer_set(&c->t, interval / 2 + random_rand() % (interval / 2),
+  ctimer_set(&c->interval_timer, interval, send_timer, c);
+  ctimer_set(&c->send_timer, interval / 2 + random_rand() % (interval / 2),
 	     send_adv, c);
 }
 /*---------------------------------------------------------------------------*/
diff --git a/core/net/rime/neighbor-discovery.h b/core/net/rime/neighbor-discovery.h
index 9336b97c6..0b3c5b81f 100644
--- a/core/net/rime/neighbor-discovery.h
+++ b/core/net/rime/neighbor-discovery.h
@@ -47,7 +47,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: neighbor-discovery.h,v 1.6 2008/07/09 09:33:58 adamdunkels Exp $
+ * $Id: neighbor-discovery.h,v 1.7 2008/08/15 19:00:38 adamdunkels Exp $
  */
 
 /**
@@ -73,7 +73,7 @@ struct neighbor_discovery_callbacks {
 struct neighbor_discovery_conn {
   struct broadcast_conn c;
   const struct neighbor_discovery_callbacks *u;
-  struct ctimer t, interval_timer;
+  struct ctimer send_timer, interval_timer;
   clock_time_t initial_interval, min_interval, max_interval;
   uint16_t val;
 };
@@ -85,6 +85,7 @@ void neighbor_discovery_open(struct neighbor_discovery_conn *c,
 			     clock_time_t max,
 			     const struct neighbor_discovery_callbacks *u);
 void neighbor_discovery_close(struct neighbor_discovery_conn *c);
+void neighbor_discovery_set_val(struct neighbor_discovery_conn *c, uint16_t val);
 
 void neighbor_discovery_start(struct neighbor_discovery_conn *c, uint16_t val);