diff --git a/esds/helpers/platform.py b/esds/helpers/platform.py
index b7e5637..e2f780d 100644
--- a/esds/helpers/platform.py
+++ b/esds/helpers/platform.py
@@ -3,7 +3,7 @@ import yaml, os
 import numpy as np
 
 class UnitsParser:
-    def range(r,limit):
+    def node_range(r,limit):
         if r == "all":
             return(range(0,limit))
         r=r.replace("@",str(limit-1))
@@ -11,9 +11,9 @@ class UnitsParser:
         if len(elt) == 2:
             min = int(elt[0])
             max = int(elt[1])
-            if min < 0 or max > limit:
+            if min < 0 or max >= limit:
                 raise Exception("Outside of range limit [0-"+str(limit)+"]")
-            return(range(min,max))
+            return(range(min,max+1))
         else:
             return(list(map(int, r.split(","))))
 
@@ -85,15 +85,15 @@ class YAMLPlatformFile:
         words=link.split()
         if len(words) == 4:
             return((
-                UnitsParser.range(words[0],self.default["node_count"]),
+                UnitsParser.node_range(words[0],self.default["node_count"]),
                 UnitsParser.bandwidth(words[1]),
                 UnitsParser.latency(words[2]),
-                UnitsParser.range(words[3],self.default["node_count"])))
+                UnitsParser.node_range(words[3],self.default["node_count"])))
         self.parsing_error("Invalide link \""+link+"\"")
 
     def parse_txperf(self,txperf):
         elts=txperf.split()
-        return((UnitsParser.range(elts[0],self.default["node_count"]),UnitsParser.bandwidth(elts[1]),UnitsParser.latency(elts[2])))
+        return((UnitsParser.node_range(elts[0],self.default["node_count"]),UnitsParser.bandwidth(elts[1]),UnitsParser.latency(elts[2])))
 
     def parse_interfaces(self):
         interfaces=self.platform["interfaces"]
@@ -124,6 +124,8 @@ class YAMLPlatformFile:
                     for node in p[0]:
                         BW[node][node]=p[1]
                         LAT[node][node]=p[2]
+                if (BW.diagonal()==0).any():
+                    self.parsing_error("Not all node have a txpref on the wireless interface "+i)
 
             self.default["interfaces"][i]={
                 "is_wired": is_wired,
@@ -145,7 +147,7 @@ class YAMLPlatformFile:
             self.default["implementations"]=[None]*self.default["node_count"]
             for impl in nodes["implementations"]:
                 words=impl.split()
-                r=UnitsParser.range(words[0],self.default["node_count"])
+                r=UnitsParser.node_range(words[0],self.default["node_count"])
                 file="".join(words[1:])
                 if not os.path.exists(file):
                     self.parsing_error("File "+file+ " not found")
diff --git a/example/platform.yaml b/example/platform.yaml
index cf8c3f8..0e1c820 100644
--- a/example/platform.yaml
+++ b/example/platform.yaml
@@ -18,7 +18,7 @@ interfaces:
         links:
             - 0 1Bps 10s 0 
         txperfs:
-            - all 1Bps 10s
+            - 0-4 1Bps 10s
     eth0:
         type: "wired"
         links: