diff --git a/gns3server/modules/dynamips/backends/vm.py b/gns3server/modules/dynamips/backends/vm.py
index 9b6055ee..99fa0f87 100644
--- a/gns3server/modules/dynamips/backends/vm.py
+++ b/gns3server/modules/dynamips/backends/vm.py
@@ -479,7 +479,11 @@ class VM(object):
 
         # Update the ghost IOS file in case the RAM size has changed
         if self._hypervisor_manager.ghost_ios_support:
-            self.set_ghost_ios(router)
+            try:
+                self.set_ghost_ios(router)
+            except DynamipsError as e:
+                self.send_custom_error(str(e))
+                return
 
         self.send_response(response)
 
diff --git a/gns3server/modules/dynamips/schemas/atmsw.py b/gns3server/modules/dynamips/schemas/atmsw.py
index 5d96e8c5..b545880b 100644
--- a/gns3server/modules/dynamips/schemas/atmsw.py
+++ b/gns3server/modules/dynamips/schemas/atmsw.py
@@ -24,8 +24,9 @@ ATMSW_CREATE_SCHEMA = {
             "description": "ATM switch name",
             "type": "string",
             "minLength": 1,
-        }
-    }
+        },
+    },
+    "additionalProperties": False,
 }
 
 ATMSW_DELETE_SCHEMA = {
@@ -38,6 +39,7 @@ ATMSW_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -56,6 +58,7 @@ ATMSW_UPDATE_SCHEMA = {
             "minLength": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -73,6 +76,7 @@ ATMSW_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -237,6 +241,7 @@ ATMSW_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port", "port_id", "mappings", "nio"],
 }
 
@@ -255,5 +260,6 @@ ATMSW_DELETE_NIO_SCHEMA = {
             "minimum": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port"]
 }
diff --git a/gns3server/modules/dynamips/schemas/ethhub.py b/gns3server/modules/dynamips/schemas/ethhub.py
index db1b1a29..efea271c 100644
--- a/gns3server/modules/dynamips/schemas/ethhub.py
+++ b/gns3server/modules/dynamips/schemas/ethhub.py
@@ -24,8 +24,9 @@ ETHHUB_CREATE_SCHEMA = {
             "description": "Ethernet hub name",
             "type": "string",
             "minLength": 1,
-        }
-    }
+        },
+    },
+    "additionalProperties": False,
 }
 
 ETHHUB_DELETE_SCHEMA = {
@@ -38,6 +39,7 @@ ETHHUB_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -56,6 +58,7 @@ ETHHUB_UPDATE_SCHEMA = {
             "minLength": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -73,6 +76,7 @@ ETHHUB_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -234,6 +238,7 @@ ETHHUB_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id", "port", "nio"]
 }
 
@@ -252,5 +257,6 @@ ETHHUB_DELETE_NIO_SCHEMA = {
             "minimum": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port"]
 }
diff --git a/gns3server/modules/dynamips/schemas/ethsw.py b/gns3server/modules/dynamips/schemas/ethsw.py
index c68a3565..0c8b8074 100644
--- a/gns3server/modules/dynamips/schemas/ethsw.py
+++ b/gns3server/modules/dynamips/schemas/ethsw.py
@@ -24,8 +24,9 @@ ETHSW_CREATE_SCHEMA = {
             "description": "Ethernet switch name",
             "type": "string",
             "minLength": 1,
-        }
-    }
+        },
+    },
+    "additionalProperties": False,
 }
 
 ETHSW_DELETE_SCHEMA = {
@@ -38,6 +39,7 @@ ETHSW_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -71,6 +73,7 @@ ETHSW_UPDATE_SCHEMA = {
 #                 },
 #         },
     },
+    #"additionalProperties": False,
     "required": ["id"]
 }
 
@@ -88,6 +91,7 @@ ETHSW_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -258,6 +262,7 @@ ETHSW_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id", "port", "port_type", "vlan", "nio"],
 
     "dependencies": {
@@ -281,5 +286,6 @@ ETHSW_DELETE_NIO_SCHEMA = {
             "minimum": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port"]
 }
diff --git a/gns3server/modules/dynamips/schemas/frsw.py b/gns3server/modules/dynamips/schemas/frsw.py
index 984d2c24..72272782 100644
--- a/gns3server/modules/dynamips/schemas/frsw.py
+++ b/gns3server/modules/dynamips/schemas/frsw.py
@@ -24,8 +24,9 @@ FRSW_CREATE_SCHEMA = {
             "description": "Frame relay switch name",
             "type": "string",
             "minLength": 1,
-        }
-    }
+        },
+    },
+    "additionalProperties": False,
 }
 
 FRSW_DELETE_SCHEMA = {
@@ -38,6 +39,7 @@ FRSW_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -56,6 +58,7 @@ FRSW_UPDATE_SCHEMA = {
             "minLength": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -73,6 +76,7 @@ FRSW_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -237,6 +241,7 @@ FRSW_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port", "port_id", "mappings", "nio"],
 }
 
@@ -255,5 +260,6 @@ FRSW_DELETE_NIO_SCHEMA = {
             "minimum": 1,
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port"]
 }
diff --git a/gns3server/modules/dynamips/schemas/vm.py b/gns3server/modules/dynamips/schemas/vm.py
index 7ab8e3fe..99b9096c 100644
--- a/gns3server/modules/dynamips/schemas/vm.py
+++ b/gns3server/modules/dynamips/schemas/vm.py
@@ -58,13 +58,14 @@ VM_CREATE_SCHEMA = {
             "minimum": 1,
             "maximum": 65535
         },
-        "mac_address": {
+        "mac_addr": {
             "description": "base MAC address",
             "type": "string",
             "minLength": 1,
             "pattern": "^([0-9a-fA-F]{4}\\.){2}[0-9a-fA-F]{4}$"
         }
     },
+    "additionalProperties": False,
     "required": ["platform", "image", "ram"]
 }
 
@@ -78,6 +79,7 @@ VM_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -91,6 +93,7 @@ VM_START_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -104,6 +107,7 @@ VM_STOP_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -117,6 +121,7 @@ VM_SUSPEND_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -130,10 +135,11 @@ VM_RELOAD_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
-#TODO: platform specific properties?
+#TODO: improve platform specific properties (dependencies?)
 VM_UPDATE_SCHEMA = {
     "$schema": "http://json-schema.org/draft-04/schema#",
     "description": "Request validation to update a VM instance",
@@ -237,7 +243,7 @@ VM_UPDATE_SCHEMA = {
             "minimum": 1,
             "maximum": 65535
         },
-        "mac_address": {
+        "mac_addr": {
             "description": "base MAC address",
             "type": "string",
             "minLength": 1,
@@ -326,7 +332,39 @@ VM_UPDATE_SCHEMA = {
             "description": "private configuration base64 encoded",
             "type": "string"
         },
+        # C7200 properties
+        "npe": {
+            "description": "NPE model",
+            "enum": ["npe-100",
+                     "npe-150",
+                     "npe-175",
+                     "npe-200",
+                     "npe-225",
+                     "npe-300",
+                     "npe-400",
+                     "npe-g2"]
+        },
+        "midplane": {
+            "description": "Midplane model",
+            "enum": ["std", "vxr"]
+        },
+        "sensors": {
+            "description": "Temperature sensors",
+            "type": "array"
+        },
+        "power_supplies": {
+            "description": "Power supplies status",
+            "type": "array"
+        },
+        # I/O memory property for all platforms but C7200
+        "iomem": {
+            "description": "I/O memory percentage",
+            "type": "integer",
+            "minimum": 0,
+            "maximum": 100
+        },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -340,6 +378,7 @@ VM_SAVE_CONFIG_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -357,6 +396,7 @@ VM_IDLEPCS_SCHEMA = {
             "type": "boolean"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -374,6 +414,7 @@ VM_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -542,6 +583,7 @@ VM_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id", "slot", "port", "nio"]
 }
 
@@ -567,5 +609,6 @@ VM_DELETE_NIO_SCHEMA = {
             "maximum": 49  # maximum is 16 for regular port numbers, WICs port numbers start at 16, 32 or 48
         },
     },
+    "additionalProperties": False,
     "required": ["id", "slot", "port"]
 }
diff --git a/gns3server/modules/iou/schemas.py b/gns3server/modules/iou/schemas.py
index 657590aa..1723f4a8 100644
--- a/gns3server/modules/iou/schemas.py
+++ b/gns3server/modules/iou/schemas.py
@@ -38,6 +38,7 @@ IOU_CREATE_SCHEMA = {
             "minLength": 1,
         }
     },
+    "additionalProperties": False,
     "required": ["path"],
 }
 
@@ -51,6 +52,7 @@ IOU_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -117,6 +119,7 @@ IOU_UPDATE_SCHEMA = {
             "type": "string"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -130,6 +133,7 @@ IOU_START_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -143,6 +147,7 @@ IOU_STOP_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -156,6 +161,7 @@ IOU_RELOAD_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -173,6 +179,7 @@ IOU_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -341,6 +348,7 @@ IOU_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id", "slot", "port", "nio"]
 }
 
@@ -367,5 +375,6 @@ IOU_DELETE_NIO_SCHEMA = {
             "maximum": 3
         },
     },
+    "additionalProperties": False,
     "required": ["id", "slot", "port"]
 }
diff --git a/gns3server/modules/vpcs/schemas.py b/gns3server/modules/vpcs/schemas.py
index 681b48f6..015b2313 100644
--- a/gns3server/modules/vpcs/schemas.py
+++ b/gns3server/modules/vpcs/schemas.py
@@ -33,6 +33,7 @@ VPCS_CREATE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
 }
 
 VPCS_DELETE_SCHEMA = {
@@ -45,6 +46,7 @@ VPCS_DELETE_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -78,6 +80,7 @@ VPCS_UPDATE_SCHEMA = {
             "type": "string"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -91,6 +94,7 @@ VPCS_START_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -104,6 +108,7 @@ VPCS_STOP_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -117,6 +122,7 @@ VPCS_RELOAD_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id"]
 }
 
@@ -134,6 +140,7 @@ VPCS_ALLOCATE_UDP_PORT_SCHEMA = {
             "type": "integer"
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id"]
 }
 
@@ -296,6 +303,7 @@ VPCS_ADD_NIO_SCHEMA = {
             ]
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port_id", "port", "nio"]
 }
 
@@ -315,5 +323,6 @@ VPCS_DELETE_NIO_SCHEMA = {
             "maximum": 0
         },
     },
+    "additionalProperties": False,
     "required": ["id", "port"]
 }
diff --git a/gns3server/version.py b/gns3server/version.py
index 1dafced7..f2a2a65b 100644
--- a/gns3server/version.py
+++ b/gns3server/version.py
@@ -23,5 +23,5 @@
 # or negative for a release candidate or beta (after the base version
 # number has been incremented)
 
-__version__ = "1.0a5.dev2"
+__version__ = "1.0a5.dev3"
 __version_info__ = (1, 0, 0, -99)