diff --git a/DAS/simulator.py b/DAS/simulator.py
index 3701167..6a369a6 100644
--- a/DAS/simulator.py
+++ b/DAS/simulator.py
@@ -61,8 +61,8 @@ class Simulator:
             for u, v in G.edges:
                 val1=rowChannels[id][u]
                 val2=rowChannels[id][v]
-                val1.rowNeighbors[id].append(val2)
-                val2.rowNeighbors[id].append(val1)
+                val1.rowNeighbors[id].append(Neighbor(val2))
+                val2.rowNeighbors[id].append(Neighbor(val1))
 
             if (len(columnChannels[id]) < self.shape.netDegree):
                 self.logger.error("Graph degree higher than %d" % len(columnChannels[id]), extra=self.format)
@@ -72,8 +72,8 @@ class Simulator:
             for u, v in G.edges:
                 val1=columnChannels[id][u]
                 val2=columnChannels[id][v]
-                val1.columnNeighbors[id].append(val2)
-                val2.columnNeighbors[id].append(val1)
+                val1.columnNeighbors[id].append(Neighbor(val2))
+                val2.columnNeighbors[id].append(Neighbor(val1))
 
     def initLogger(self):
         logger = logging.getLogger("DAS")
diff --git a/DAS/validator.py b/DAS/validator.py
index 278c7cd..c2c0124 100644
--- a/DAS/validator.py
+++ b/DAS/validator.py
@@ -7,6 +7,14 @@ from DAS.block import *
 from bitarray import bitarray
 from bitarray.util import zeros
 
+class Neighbor:
+
+    def __repr__(self):
+        return str(self.node.ID)
+
+    def __init__(self, v):
+        self.node = v
+
 class Validator:
 
     ID = 0
@@ -122,14 +130,14 @@ class Validator:
         if line.any():
             self.logger.debug("col %d -> %s", columnID, self.columnNeighbors[columnID] , extra=self.format)
             for n in self.columnNeighbors[columnID]:
-                n.receiveColumn(columnID, line)
+                n.node.receiveColumn(columnID, line)
 
     def sendRow(self, rowID):
         line = self.getRow(rowID)
         if line.any():
             self.logger.debug("row %d -> %s", rowID, self.rowNeighbors[rowID], extra=self.format)
             for n in self.rowNeighbors[rowID]:
-                n.receiveRow(rowID, line)
+                n.node.receiveRow(rowID, line)
 
     def sendRows(self):
         if self.amIproposer == 1: