diff --git a/gns3server/modules/dynamips/nodes/c1700.py b/gns3server/modules/dynamips/nodes/c1700.py
index 241601a2..906abe3e 100644
--- a/gns3server/modules/dynamips/nodes/c1700.py
+++ b/gns3server/modules/dynamips/nodes/c1700.py
@@ -44,7 +44,7 @@ class C1700(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c1700")
 
         # Set default values for this platform
-        self._ram = 64
+        self._ram = 128
         self._nvram = 32
         self._disk0 = 0
         self._disk1 = 0
diff --git a/gns3server/modules/dynamips/nodes/c2600.py b/gns3server/modules/dynamips/nodes/c2600.py
index 56866235..b5e46e89 100644
--- a/gns3server/modules/dynamips/nodes/c2600.py
+++ b/gns3server/modules/dynamips/nodes/c2600.py
@@ -59,7 +59,7 @@ class C2600(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c2600")
 
         # Set default values for this platform
-        self._ram = 64
+        self._ram = 128
         self._nvram = 128
         self._disk0 = 0
         self._disk1 = 0
diff --git a/gns3server/modules/dynamips/nodes/c2691.py b/gns3server/modules/dynamips/nodes/c2691.py
index 339fada9..0dc0ef28 100644
--- a/gns3server/modules/dynamips/nodes/c2691.py
+++ b/gns3server/modules/dynamips/nodes/c2691.py
@@ -40,7 +40,7 @@ class C2691(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c2691")
 
         # Set default values for this platform
-        self._ram = 128
+        self._ram = 192
         self._nvram = 112
         self._disk0 = 16
         self._disk1 = 0
diff --git a/gns3server/modules/dynamips/nodes/c3600.py b/gns3server/modules/dynamips/nodes/c3600.py
index b0117a16..32e2bbe7 100644
--- a/gns3server/modules/dynamips/nodes/c3600.py
+++ b/gns3server/modules/dynamips/nodes/c3600.py
@@ -42,7 +42,7 @@ class C3600(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c3600")
 
         # Set default values for this platform
-        self._ram = 128
+        self._ram = 192
         self._nvram = 128
         self._disk0 = 0
         self._disk1 = 0
diff --git a/gns3server/modules/dynamips/nodes/c3745.py b/gns3server/modules/dynamips/nodes/c3745.py
index f8392cc3..8002909a 100644
--- a/gns3server/modules/dynamips/nodes/c3745.py
+++ b/gns3server/modules/dynamips/nodes/c3745.py
@@ -40,7 +40,7 @@ class C3745(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c3745")
 
         # Set default values for this platform
-        self._ram = 128
+        self._ram = 256
         self._nvram = 304
         self._disk0 = 16
         self._disk1 = 0
diff --git a/gns3server/modules/dynamips/nodes/c7200.py b/gns3server/modules/dynamips/nodes/c7200.py
index a473f954..21ab4aa6 100644
--- a/gns3server/modules/dynamips/nodes/c7200.py
+++ b/gns3server/modules/dynamips/nodes/c7200.py
@@ -43,7 +43,7 @@ class C7200(Router):
         Router.__init__(self, hypervisor, name, router_id, platform="c7200")
 
         # Set default values for this platform
-        self._ram = 256
+        self._ram = 512
         self._nvram = 128
         self._disk0 = 64
         self._disk1 = 0
diff --git a/gns3server/modules/virtualbox/__init__.py b/gns3server/modules/virtualbox/__init__.py
index 561c5131..9fc547d1 100644
--- a/gns3server/modules/virtualbox/__init__.py
+++ b/gns3server/modules/virtualbox/__init__.py
@@ -721,7 +721,7 @@ class VirtualBox(IModule):
         """
 
         try:
-            result = subprocess.check_output(command, stderr=subprocess.STDOUT, timeout=30)
+            result = subprocess.check_output(command, stderr=subprocess.STDOUT, timeout=60)
         except (OSError, subprocess.SubprocessError) as e:
             raise VirtualBoxError("Could not execute VBoxManage {}".format(e))
         return result.decode("utf-8", errors="ignore")
diff --git a/gns3server/modules/virtualbox/virtualbox_vm.py b/gns3server/modules/virtualbox/virtualbox_vm.py
index deb34e1f..130afc9c 100644
--- a/gns3server/modules/virtualbox/virtualbox_vm.py
+++ b/gns3server/modules/virtualbox/virtualbox_vm.py
@@ -25,7 +25,6 @@ import re
 import os
 import subprocess
 import tempfile
-import shutil
 import json
 import socket
 import time
@@ -535,7 +534,7 @@ class VirtualBoxVM(object):
                                                                                                  id=self._id,
                                                                                                  adapter_type=adapter_type))
 
-    def _execute(self, subcommand, args, timeout=30):
+    def _execute(self, subcommand, args, timeout=60):
         """
         Executes a command with VBoxManage.