diff --git a/gns3server/compute/dynamips/nodes/ethernet_hub.py b/gns3server/compute/dynamips/nodes/ethernet_hub.py
index e2377b50..df811e7e 100644
--- a/gns3server/compute/dynamips/nodes/ethernet_hub.py
+++ b/gns3server/compute/dynamips/nodes/ethernet_hub.py
@@ -49,7 +49,7 @@ class EthernetHub(Bridge):
         if ports is None:
             # create 8 ports by default
             self._ports = []
-            for port_number in range(1, 9):
+            for port_number in range(0, 8):
                 self._ports.append({"port_number": port_number,
                                     "name": "Ethernet{}".format(port_number)})
         else:
diff --git a/gns3server/compute/dynamips/nodes/ethernet_switch.py b/gns3server/compute/dynamips/nodes/ethernet_switch.py
index 298d718e..482e8bc3 100644
--- a/gns3server/compute/dynamips/nodes/ethernet_switch.py
+++ b/gns3server/compute/dynamips/nodes/ethernet_switch.py
@@ -52,7 +52,7 @@ class EthernetSwitch(Device):
         if ports is None:
             # create 8 ports by default
             self._ports = []
-            for port_number in range(1, 9):
+            for port_number in range(0, 8):
                 self._ports.append({"port_number": port_number,
                                     "name": "Ethernet{}".format(port_number),
                                     "type": "access",
diff --git a/gns3server/controller/topology.py b/gns3server/controller/topology.py
index 1ea40cb3..b94dcff5 100644
--- a/gns3server/controller/topology.py
+++ b/gns3server/controller/topology.py
@@ -204,8 +204,8 @@ def _convert_1_3_later(topo, topo_path):
             node["properties"]["ports_mapping"] = []
             for port in old_node["ports"]:
                 node["properties"]["ports_mapping"].append({
-                    "name": "Ethernet{}".format(port["port_number"]),
-                    "port_number": port["port_number"]
+                    "name": "Ethernet{}".format(port["port_number"] - 1),
+                    "port_number": port["port_number"] - 1
                 })
         elif old_node["type"] == "EthernetSwitch":
             node["node_type"] = "ethernet_switch"
@@ -214,8 +214,8 @@ def _convert_1_3_later(topo, topo_path):
             node["properties"]["ports_mapping"] = []
             for port in old_node["ports"]:
                 node["properties"]["ports_mapping"].append({
-                    "name": "Ethernet{}".format(port["port_number"]),
-                    "port_number": port["port_number"],
+                    "name": "Ethernet{}".format(port["port_number"] - 1),
+                    "port_number": port["port_number"] - 1,
                     "type": port["type"],
                     "vlan": port["vlan"]
                 })
diff --git a/tests/topologies/1_5_builtins/after/builtins.gns3 b/tests/topologies/1_5_builtins/after/builtins.gns3
index 0c0c5f22..7cdf6b1c 100644
--- a/tests/topologies/1_5_builtins/after/builtins.gns3
+++ b/tests/topologies/1_5_builtins/after/builtins.gns3
@@ -62,6 +62,10 @@
                 "first_port_name": null,
                 "properties": {
                     "ports_mapping": [
+                        {
+                            "name": "Ethernet0",
+                            "port_number": 0
+                        },
                         {
                             "name": "Ethernet1",
                             "port_number": 1
@@ -89,10 +93,6 @@
                         {
                             "name": "Ethernet7",
                             "port_number": 7
-                        },
-                        {
-                            "name": "Ethernet8",
-                            "port_number": 8
                         }
                     ]
                 },
@@ -120,6 +120,12 @@
                 "first_port_name": null,
                 "properties": {
                     "ports_mapping": [
+                        {
+                            "name": "Ethernet0",
+                            "port_number": 0,
+                            "type": "access",
+                            "vlan": 1
+                        },
                         {
                             "name": "Ethernet1",
                             "port_number": 1,
@@ -161,12 +167,6 @@
                             "port_number": 7,
                             "type": "access",
                             "vlan": 1
-                        },
-                        {
-                            "name": "Ethernet8",
-                            "port_number": 8,
-                            "type": "access",
-                            "vlan": 1
                         }
                     ]
                 },