diff --git a/gns3server/modules/dynamips/nodes/router.py b/gns3server/modules/dynamips/nodes/router.py
index bcb2886c..95944ff7 100644
--- a/gns3server/modules/dynamips/nodes/router.py
+++ b/gns3server/modules/dynamips/nodes/router.py
@@ -22,6 +22,7 @@ http://github.com/GNS3/dynamips/blob/master/README.hypervisor#L77
 
 from __future__ import unicode_literals
 from ..dynamips_error import DynamipsError
+import sys
 import os
 
 import logging
@@ -68,15 +69,18 @@ class Router(object):
         self._idlesleep = 30
         self._ghost_file = ""
         self._ghost_status = 0
-        self._exec_area = None  # Megabytes (None = default for the router platform)
+        if sys.platform.startswith("win"):
+            self._exec_area = 16  # 16 MB by default on Windows (Cygwin)
+        else:
+            self._exec_area = 64  # 64 MB on other systems
         self._jit_sharing_group = None
         self._disk0 = 0  # Megabytes
         self._disk1 = 0  # Megabytes
-        self._confreg = '0x2102'
+        self._confreg = "0x2102"
         self._console = None
         self._aux = None
         self._mac_addr = None
-        self._system_id = None  # processor board ID in IOS
+        self._system_id = "FTX0945W0MY"  # processor board ID in IOS
         self._slots = []
 
         self._hypervisor.send("vm create {name} {id} {platform}".format(name=self._name,
@@ -90,6 +94,7 @@ class Router(object):
             self.console = self._hypervisor.baseconsole + self._id
             self.aux = self._hypervisor.baseaux + self._id
 
+            # get the default base MAC address
             self._mac_addr = self._hypervisor.send("{platform} get_mac_addr {name}".format(platform=self._platform,
                                                                                      name=self._name))[0]
         else:
diff --git a/tests/dynamips/test_c1700.py b/tests/dynamips/test_c1700.py
index 2202a50f..4ed3a2d2 100644
--- a/tests/dynamips/test_c1700.py
+++ b/tests/dynamips/test_c1700.py
@@ -89,7 +89,7 @@ def test_iomem(router_c1700):
 
 def test_mac_addr(router_c1700):
 
-    assert router_c1700.mac_addr == None  # default value
+    assert router_c1700.mac_addr != None
     router_c1700.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c1700.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -102,7 +102,7 @@ def test_bogus_mac_addr(router_c1700):
 
 def test_system_id(router_c1700):
 
-    assert router_c1700.system_id == None  # default value
+    assert router_c1700.system_id == "FTX0945W0MY"  # default value
     router_c1700.system_id = "FTX0945W0MO"
     assert router_c1700.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_c2600.py b/tests/dynamips/test_c2600.py
index d17ee345..ae94f1b4 100644
--- a/tests/dynamips/test_c2600.py
+++ b/tests/dynamips/test_c2600.py
@@ -165,7 +165,7 @@ def test_iomem(router_c2600):
 
 def test_mac_addr(router_c2600):
 
-    assert router_c2600.mac_addr == None  # default value
+    assert router_c2600.mac_addr != None
     router_c2600.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c2600.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -178,7 +178,7 @@ def test_bogus_mac_addr(router_c2600):
 
 def test_system_id(router_c2600):
 
-    assert router_c2600.system_id == None  # default value
+    assert router_c2600.system_id == "FTX0945W0MY"  # default value
     router_c2600.system_id = "FTX0945W0MO"
     assert router_c2600.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_c2691.py b/tests/dynamips/test_c2691.py
index 8cda066a..64acc6c1 100644
--- a/tests/dynamips/test_c2691.py
+++ b/tests/dynamips/test_c2691.py
@@ -29,7 +29,7 @@ def test_iomem(router_c2691):
 
 def test_mac_addr(router_c2691):
 
-    assert router_c2691.mac_addr == None  # default value
+    assert router_c2691.mac_addr != None
     router_c2691.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c2691.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -40,12 +40,11 @@ def test_bogus_mac_addr(router_c2691):
         router_c2691.mac_addr = "zz:zz:zz:zz:zz:zz"
 
 
-def test_system_id(hypervisor):
-    router = C2691(hypervisor, "test system id")
-    assert router.system_id == None  # default value
-    router.system_id = "FTX0945W0MO"
-    assert router.system_id == "FTX0945W0MO"
-    router.delete()
+def test_system_id(router_c2691):
+
+    assert router_c2691.system_id == "FTX0945W0MY"  # default value
+    router_c2691.system_id = "FTX0945W0MO"
+    assert router_c2691.system_id == "FTX0945W0MO"
 
 
 def test_get_hardware_info(router_c2691):
diff --git a/tests/dynamips/test_c3600.py b/tests/dynamips/test_c3600.py
index f3bd06cb..435f1b27 100644
--- a/tests/dynamips/test_c3600.py
+++ b/tests/dynamips/test_c3600.py
@@ -60,7 +60,7 @@ def test_iomem(router_c3600):
 
 def test_mac_addr(router_c3600):
 
-    assert router_c3600.mac_addr == None  # default value
+    assert router_c3600.mac_addr != None
     router_c3600.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c3600.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -73,7 +73,7 @@ def test_bogus_mac_addr(router_c3600):
 
 def test_system_id(router_c3600):
 
-    assert router_c3600.system_id == None  # default value
+    assert router_c3600.system_id == "FTX0945W0MY"  # default value
     router_c3600.system_id = "FTX0945W0MO"
     assert router_c3600.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_c3725.py b/tests/dynamips/test_c3725.py
index 5bb6f6e9..a4a923cf 100644
--- a/tests/dynamips/test_c3725.py
+++ b/tests/dynamips/test_c3725.py
@@ -29,7 +29,7 @@ def test_iomem(router_c3725):
 
 def test_mac_addr(router_c3725):
 
-    assert router_c3725.mac_addr == None  # default value
+    assert router_c3725.mac_addr != None
     router_c3725.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c3725.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -42,7 +42,7 @@ def test_bogus_mac_addr(router_c3725):
 
 def test_system_id(router_c3725):
 
-    assert router_c3725.system_id == None  # default value
+    assert router_c3725.system_id == "FTX0945W0MY"  # default value
     router_c3725.system_id = "FTX0945W0MO"
     assert router_c3725.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_c3745.py b/tests/dynamips/test_c3745.py
index 78cc53e3..c58b5c2e 100644
--- a/tests/dynamips/test_c3745.py
+++ b/tests/dynamips/test_c3745.py
@@ -29,7 +29,7 @@ def test_iomem(router_c3745):
 
 def test_mac_addr(router_c3745):
 
-    assert router_c3745.mac_addr == None  # default value
+    assert router_c3745.mac_addr != None
     router_c3745.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c3745.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -42,7 +42,7 @@ def test_bogus_mac_addr(router_c3745):
 
 def test_system_id(router_c3745):
 
-    assert router_c3745.system_id == None  # default value
+    assert router_c3745.system_id == "FTX0945W0MY"  # default value
     router_c3745.system_id = "FTX0945W0MO"
     assert router_c3745.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_c7200.py b/tests/dynamips/test_c7200.py
index d3929188..7b74cc7f 100644
--- a/tests/dynamips/test_c7200.py
+++ b/tests/dynamips/test_c7200.py
@@ -57,7 +57,7 @@ def test_power_supplies(router_c7200):
 
 def test_mac_addr(router_c7200):
 
-    assert router_c7200.mac_addr == None  # default value
+    assert router_c7200.mac_addr != None
     router_c7200.mac_addr = "aa:aa:aa:aa:aa:aa"
     assert router_c7200.mac_addr == "aa:aa:aa:aa:aa:aa"
 
@@ -70,7 +70,7 @@ def test_bogus_mac_addr(router_c7200):
 
 def test_system_id(router_c7200):
 
-    assert router_c7200.system_id == None  # default value
+    assert router_c7200.system_id == "FTX0945W0MY"  # default value
     router_c7200.system_id = "FTX0945W0MO"
     assert router_c7200.system_id == "FTX0945W0MO"
 
diff --git a/tests/dynamips/test_router.py b/tests/dynamips/test_router.py
index 50cc7b79..1affa539 100644
--- a/tests/dynamips/test_router.py
+++ b/tests/dynamips/test_router.py
@@ -1,5 +1,6 @@
 from gns3server.modules.dynamips import Router
 from gns3server.modules.dynamips import DynamipsError
+import sys
 import pytest
 import tempfile
 import base64
@@ -140,9 +141,12 @@ def test_idlesleep(router):
 
 def test_exec_area(router):
 
-    assert router.exec_area == None  # default value
-    router.exec_area = 64
-    assert router.exec_area == 64
+    if sys.platform.startswith("win"):
+        assert router.exec_area == 16  # default value
+    else:
+        assert router.exec_area == 64  # default value
+    router.exec_area = 48
+    assert router.exec_area == 48
 
 
 def test_disk0(router):
@@ -218,7 +222,7 @@ def test_bogus_mac_addr(router):
 
 def test_system_id(router):
 
-    assert router.system_id == None  # default value
+    assert router.system_id == "FTX0945W0MY"  # default value
     router.system_id = "FTX0945W0MO"
     assert router.system_id == "FTX0945W0MO"