diff --git a/src/mpConfig.py b/src/mpConfig.py
index d0b7832..1888324 100644
--- a/src/mpConfig.py
+++ b/src/mpConfig.py
@@ -1,4 +1,7 @@
 class MpConfig:
+	
+	PING_OUTPUT = "ping.log"
+
 	def __init__(self, topo, param):
 		self.topo = topo
 		self.param = param
@@ -35,4 +38,9 @@ class MpConfig:
 		s = "ip route add default via " + via
 		print(s)
 		return s
-
+	
+	def pingCommand(self, fromIP, toIP, n=5):
+		s = "ping -c " + str(n) + " -I " + fromIP + " " + toIP + \
+				" >> " + MpConfig.PING_OUTPUT
+		print(s)
+		return s
diff --git a/src/mpMultiInterfaceConfig.py b/src/mpMultiInterfaceConfig.py
index 4de1a39..7c05f03 100644
--- a/src/mpMultiInterfaceConfig.py
+++ b/src/mpMultiInterfaceConfig.py
@@ -97,3 +97,12 @@ class MpMultiInterfaceConfig(MpConfig):
 	
 	def getServerInterface(self):
 		return  MpTopo.serverName + "-eth0"
+
+	def pingAllFromClient(self, n = 5):
+		i = 0
+		self.topo.commandTo(self.client, "rm " + MpConfig.PING_OUTPUT)
+		for l in self.topo.switch:
+			cmd = self.pingCommand(self.getClientIP(i),
+					self.getServerIP(), n)
+			self.topo.commandTo(self.client, cmd)
+			i = i + 1
diff --git a/src/mpParamTopo.py b/src/mpParamTopo.py
index 0daa592..120d880 100644
--- a/src/mpParamTopo.py
+++ b/src/mpParamTopo.py
@@ -34,7 +34,7 @@ class MpParamTopo:
 
 	def loadLinkCharacteristics(self):
 		i = 0 
-		for k in self.paramDic:
+		for k in sorted(self.paramDic):
 			if k.startswith("path"):
 				tab = self.paramDic[k].split(",")
 				if len(tab) == 3:
diff --git a/src/mpPerf.py b/src/mpPerf.py
index 1a6387b..7e24353 100755
--- a/src/mpPerf.py
+++ b/src/mpPerf.py
@@ -42,6 +42,7 @@ if __name__ == '__main__':
 			mpConfig = MpMultiInterfaceConfig(mpTopo, param)
 			mpTopo.startNetwork()
 			mpConfig.configureNetwork()
+			mpConfig.pingAllFromClient()
 			mpTopo.getCLI()
 			mpTopo.stopNetwork()
 	else: