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committedJul 16, 2015
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‎articles/best-practices-resource-manager-security.md

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@@ -196,7 +196,7 @@ You can associate an NSG with a VM, or to a subnet within a virtual network. Whe
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received by the VM instance. When applied to a subnet within your virtual network, it applies to all the traffic that is sent and received by all the VM instances
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in the subnet. A VM or subnet can be associated with only 1 NSG, but each NSG can contain up to 200 rules. You can have 100 NSGs per subscription.
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> [AZURE.NOTE] Endpoint-based ACLs and network security groups are not supported on the same VM instance. If you want to use an NSG and have an endpoint ACL already in place, first remove the endpoint ACL. For information about how to do this, see [Managing Access Control Lists (ACLs) for Endpoints by using PowerShell](https://msdn.microsoft.com/library/azure/dn376543.aspx).
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>[AZURE.NOTE] Endpoint-based ACLs and network security groups are not supported on the same VM instance. If you want to use an NSG and have an endpoint ACL already in place, first remove the endpoint ACL. For information about how to do this, see [Managing Access Control Lists (ACLs) for Endpoints by using PowerShell](https://msdn.microsoft.com/library/azure/dn376543.aspx).
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### How network security groups work
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BGP routes are used in the same way as default routes and user defined routes in each Azure subnet. For more information see
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[ExpressRoute Introduction](expressroute-information.md).
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> [AZURE.NOTE] When ExpressRoute on NRP is supported, you will be able to configure your Azure environment to use force tunneling through your on-premises network by creating a user defined route for subnet 0.0.0.0/0 that uses the VPN gateway as the next hop. However, this only works if you are using a VPN gateway, not ExpressRoute. For ExpressRoute, forced tunneling is configured through BGP.
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>[AZURE.NOTE] When ExpressRoute on NRP is supported, you will be able to configure your Azure environment to use force tunneling through your on-premises network by creating a user defined route for subnet 0.0.0.0/0 that uses the VPN gateway as the next hop. However, this only works if you are using a VPN gateway, not ExpressRoute. For ExpressRoute, forced tunneling is configured through BGP.
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### User-defined routes
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2. BGP route (when ExpressRoute is used)
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3. Default route
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> [AZURE.NOTE] User defined routes are only applied to Azure VMs and cloud services. For instance, if you want to add a firewall virtual appliance between your on-premises network and Azure, you will have to create a user defined route for your Azure route tables that forward all traffic going to the on-premises address space to the virtual appliance. However, incoming traffic from the on-premises address space will flow through your VPN gateway or ExpressRoute circuit straight to the Azure environment, bypassing the virtual appliance.
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>[AZURE.NOTE] User defined routes are only applied to Azure VMs and cloud services. For instance, if you want to add a firewall virtual appliance between your on-premises network and Azure, you will have to create a user defined route for your Azure route tables that forward all traffic going to the on-premises address space to the virtual appliance. However, incoming traffic from the on-premises address space will flow through your VPN gateway or ExpressRoute circuit straight to the Azure environment, bypassing the virtual appliance.
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### IP forwarding
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