Take in account the case of `ip neigh add` failure

creationRoutesVM.sh

@@ -176,6 +176,12 @@ for ID_RANGE_V4 in ${ID_RANGES_V4}; do
 		echo "${COMMAND}"
 		write_log INFO "${COMMAND}"
 		${COMMAND}
+
+		# If the previous command fails, it’s because trafic has
+		# already be sent to the VM
+		if [ $? =2 ]; then
+			ip neigh replace ${VM_IPV4} lladdr ${MAC} dev tap${VM_ID}i0
+		fi
 	else
 		# En cas d'echec, on continue de parcourir les autres RANGES
 		write_log WARN 'Empty value or doen’t correspond to an IPv4'
@@ -213,6 +219,12 @@ for ID_RANGE_V6 in ${ID_RANGES_V6}; do
 		echo "${COMMAND}"
 		write_log INFO "${COMMAND}"
 		${COMMAND}
+
+		# If the previous command fails, it’s because trafic has
+		# already be sent to the VM
+		if [ $? =2 ]; then
+			ip neigh replace ${VM_NH} lladdr ${MAC} dev tap${VM_ID}i0
+		fi
 	else
 		# En cas d'echec, on continue de parcourir les autres RANGES
 		echo "Valeur vide ou ne correspond pas à un range IPV6"