diff --git a/api/src/org/apache/cloudstack/api/command/user/network/CreateNetworkCmd.java b/api/src/org/apache/cloudstack/api/command/user/network/CreateNetworkCmd.java
index 580948ac2b1..bbd8b5a7447 100644
--- a/api/src/org/apache/cloudstack/api/command/user/network/CreateNetworkCmd.java
+++ b/api/src/org/apache/cloudstack/api/command/user/network/CreateNetworkCmd.java
@@ -268,6 +268,10 @@ public class CreateNetworkCmd extends BaseCmd {
     @Override
     // an exception thrown by createNetwork() will be caught by the dispatcher.
     public void execute() throws InsufficientCapacityException, ConcurrentOperationException, ResourceAllocationException{
+        if (getStartIpv6() != null && getStartIp() != null) {
+        	throw new InvalidParameterValueException("Cannot support dualstack at this moment!");
+        }
+        
         Network result = _networkService.createGuestNetwork(this);
         if (result != null) {
             NetworkResponse response = _responseGenerator.createNetworkResponse(result);
diff --git a/api/src/org/apache/cloudstack/api/command/user/vm/DeployVMCmd.java b/api/src/org/apache/cloudstack/api/command/user/vm/DeployVMCmd.java
index 83025905cbf..b21b53c831c 100644
--- a/api/src/org/apache/cloudstack/api/command/user/vm/DeployVMCmd.java
+++ b/api/src/org/apache/cloudstack/api/command/user/vm/DeployVMCmd.java
@@ -302,6 +302,9 @@ public class DeployVMCmd extends BaseAsyncCreateCmd {
                 if (requestedIpv6 != null) {
                 	requestedIpv6 = requestedIpv6.toLowerCase();
                 }
+                if (requestedIpv6 != null) {
+                	throw new InvalidParameterValueException("Cannot support specified IPv6 address!");
+                }
                 IpAddresses addrs = new IpAddresses(requestedIp, requestedIpv6);
                 ipToNetworkMap.put(networkId, addrs);
             }
@@ -404,6 +407,10 @@ public class DeployVMCmd extends BaseAsyncCreateCmd {
     @Override
     public void create() throws ResourceAllocationException{
         try {
+        	if (getIp6Address() != null) {
+        		throw new InvalidParameterValueException("Cannot support specified IPv6 address!");
+        	}
+        	
             //Verify that all objects exist before passing them to the service
             Account owner = _accountService.getActiveAccountById(getEntityOwnerId());
 
diff --git a/server/src/com/cloud/network/NetworkServiceImpl.java b/server/src/com/cloud/network/NetworkServiceImpl.java
index e1c020b828b..a5fd0e929b7 100755
--- a/server/src/com/cloud/network/NetworkServiceImpl.java
+++ b/server/src/com/cloud/network/NetworkServiceImpl.java
@@ -735,10 +735,6 @@ public class NetworkServiceImpl implements  NetworkService, Manager {
 
         UserContext.current().setAccountId(owner.getAccountId());
 
-        if (startIPv6 != null && startIP != null) {
-        	throw new InvalidParameterValueException("Cannot support dualstack at this moment!");
-        }
-        
         boolean ipv4 = false, ipv6 = false;
         if (startIP != null) {
         	ipv4 = true;