diff --git a/src/mpECMPSingleInterfaceConfig.py b/src/mpECMPSingleInterfaceConfig.py
index aa77c64..74c9886 100644
--- a/src/mpECMPSingleInterfaceConfig.py
+++ b/src/mpECMPSingleInterfaceConfig.py
@@ -154,3 +154,14 @@ class MpECMPSingleInterfaceConfig(MpConfig):
 	def getServerInterface(self):
 		return  MpTopo.serverName + "-eth0"
 
+	def getMidLeftName(self, id):
+		return MpTopo.routerNamePrefix + str(id)
+
+	def getMidRightName(self, id):
+		return MpTopo.switchNamePrefix + "1"
+
+	def getMidL2RInterface(self, id):
+		return self.getMidLeftName(id) + "-eth1"
+
+	def getMidR2LInterface(self, id):
+		return self.getMidRightName(id) + "-eth" + str(id+2)
diff --git a/src/mpExperience.py b/src/mpExperience.py
index 80ed614..a7b0f98 100644
--- a/src/mpExperience.py
+++ b/src/mpExperience.py
@@ -100,11 +100,13 @@ class MpExperience:
 
 	def runTcpDump(self):
 		#todo : replace filename by cst
-		if self.xpParam.getParam(MpParamXp.CLIENTPCAP) == "yes" :
+		cpcap = self.xpParam.getParam(MpParamXp.CLIENTPCAP)
+		spcap = self.xpParam.getParam(MpParamXp.SERVERPCAP)
+		if cpcap == "yes" :
 			self.mpTopo.commandTo(self.mpConfig.client,
 					"tcpdump -i any -w client.pcap &")
-		if self.xpParam.getParam(MpParamXp.SERVERPCAP) == "yes" :
+		if spcap == "yes" :
 			self.mpTopo.commandTo(self.mpConfig.client,
 					"tcpdump -i any -w server.pcap &")
-		self.mpTopo.commandTo(self.mpConfig.client,
-				"sleep 5")
+		if spcap == "yes" or cpcap == "yes":
+			self.mpTopo.commandTo(self.mpConfig.client,"sleep 5")