diff --git a/src/node/arp.cc b/src/node/arp.cc
index acf7035ae..3414d1d12 100644
--- a/src/node/arp.cc
+++ b/src/node/arp.cc
@@ -81,7 +81,8 @@ Arp::Receive(Packet& packet, NetDevice &device)
   if (arp.IsRequest () && 
       arp.GetDestinationIpv4Address () == cache->GetInterface ()->GetAddress ()) 
     {
-      NS_DEBUG ("got request from " << arp.GetSourceIpv4Address () << " -- send reply");
+      NS_DEBUG ("node="<<m_node->GetId () <<", got request from " << 
+                arp.GetSourceIpv4Address () << " -- send reply");
       SendArpReply (cache, arp.GetSourceIpv4Address (),
                     arp.GetSourceHardwareAddress ());
     } 
@@ -95,7 +96,8 @@ Arp::Receive(Packet& packet, NetDevice &device)
         {
           if (entry->IsWaitReply ()) 
             {
-              NS_DEBUG ("got reply from " << arp.GetSourceIpv4Address ()
+              NS_DEBUG ("node="<<m_node->GetId ()<<", got reply from " << 
+                        arp.GetSourceIpv4Address ()
                      << " for waiting entry -- flush");
               MacAddress from_mac = arp.GetSourceHardwareAddress ();
               Packet waiting = entry->MarkAlive (from_mac);
@@ -105,14 +107,15 @@ Arp::Receive(Packet& packet, NetDevice &device)
             {
               // ignore this reply which might well be an attempt 
               // at poisening my arp cache.
-              NS_DEBUG ("got reply from " << arp.GetSourceIpv4Address () << 
-                     " for non-waiting entry -- drop");
+              NS_DEBUG ("node="<<m_node->GetId ()<<", got reply from " << 
+                        arp.GetSourceIpv4Address () << 
+                        " for non-waiting entry -- drop");
 	      // XXX report packet as dropped.
             }
         } 
       else 
         {
-          NS_DEBUG ("got reply for unknown entry -- drop");
+          NS_DEBUG ("node="<<m_node->GetId ()<<", got reply for unknown entry -- drop");
 	  // XXX report packet as dropped.
         }
     }
@@ -130,19 +133,22 @@ Arp::Lookup (Packet &packet, Ipv4Address destination,
         {
           if (entry->IsDead ()) 
             {
-              NS_DEBUG ("dead entry for " << destination << " expired -- send arp request");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", dead entry for " << destination << " expired -- send arp request");
               entry->MarkWaitReply (packet);
               SendArpRequest (cache, destination);
             } 
           else if (entry->IsAlive ()) 
             {
-              NS_DEBUG ("alive entry for " << destination << " expired -- send arp request");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", alive entry for " << destination << " expired -- send arp request");
               entry->MarkWaitReply (packet);
               SendArpRequest (cache, destination);
             } 
           else if (entry->IsWaitReply ()) 
             {
-              NS_DEBUG ("wait reply for " << destination << " expired -- drop");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", wait reply for " << destination << " expired -- drop");
               entry->MarkDead ();
 	      // XXX report packet as 'dropped'
             }
@@ -151,18 +157,21 @@ Arp::Lookup (Packet &packet, Ipv4Address destination,
         {
           if (entry->IsDead ()) 
             {
-              NS_DEBUG ("dead entry for " << destination << " valid -- drop");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", dead entry for " << destination << " valid -- drop");
 	      // XXX report packet as 'dropped'
             } 
           else if (entry->IsAlive ()) 
             {
-              NS_DEBUG ("alive entry for " << destination << " valid -- send");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", alive entry for " << destination << " valid -- send");
 	      *hardwareDestination = entry->GetMacAddress ();
               return true;
             } 
           else if (entry->IsWaitReply ()) 
             {
-              NS_DEBUG ("wait reply for " << destination << " valid -- drop previous");
+              NS_DEBUG ("node="<<m_node->GetId ()<<
+                        ", wait reply for " << destination << " valid -- drop previous");
               Packet old = entry->UpdateWaitReply (packet);
 	      // XXX report 'old' packet as 'dropped'
             }
@@ -172,7 +181,8 @@ Arp::Lookup (Packet &packet, Ipv4Address destination,
   else
     {
       // This is our first attempt to transmit data to this destination.
-      NS_DEBUG ("no entry for " << destination << " -- send arp request");
+      NS_DEBUG ("node="<<m_node->GetId ()<<
+                ", no entry for " << destination << " -- send arp request");
       entry = cache->Add (destination);
       entry->MarkWaitReply (packet);
       SendArpRequest (cache, destination);