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Merge pull request #192114 from asudbring/nat-patch
Fix typo in paragraph
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articles/virtual-network/nat-gateway/nat-overview.md

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@@ -44,41 +44,41 @@ A NAT gateway can be created in a specific availability zone. Redundancy is buil
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Virtual Network NAT is scaled out from creation. There isn't a ramp up or scale-out operation required. Azure manages the operation of Virtual Network NAT for you. A NAT gateway always has multiple fault domains and can sustain multiple failures without service outage.
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* Outbound connectivity can be defined for each subnet with a NAT gateway. Multiple subnets within the same virtual network can have different NAT gateways associated. Multiple subnets within the same virtual network can use the same NAT gateway. A subnet is configured by specifying which NAT gateway resource to use. All outbound traffic for the subnet is processed by the NAT gateway without any customer configuration. A NAT gateway takes precedence over other outbound scenarios and replaces the default Internet destination of a subnet.
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* Outbound connectivity can be defined for each subnet with a NAT gateway. Multiple subnets within the same virtual network can have different NAT gateways associated. Multiple subnets within the same virtual network can use the same NAT gateway. A subnet is configured by specifying which NAT gateway resource to use. All outbound traffic for the subnet is processed by the NAT gateway without any customer configuration. A NAT gateway takes precedence over other outbound scenarios and replaces the default Internet destination of a subnet
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* Presence of custom UDRs for virtual appliances and ExpressRoute override NAT gateway for directing internet bound traffic (route to the 0.0.0.0/0 address prefix). See [Troubleshooting NAT gateway](./troubleshoot-nat.md#virtual-appliance-udrs-and-vpn-expressroute-override-nat-gateway-for-routing-outbound-traffic) to learn more.
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* Presence of custom UDRs for virtual appliances and ExpressRoute override NAT gateway for directing internet bound traffic (route to the 0.0.0.0/0 address prefix). See [Troubleshooting NAT gateway](./troubleshoot-nat.md#virtual-appliance-udrs-and-vpn-expressroute-override-nat-gateway-for-routing-outbound-traffic) to learn more
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* Virtual Network NAT supports TCP and UDP protocols only. ICMP isn't supported.
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* Virtual Network NAT supports TCP and UDP protocols only. ICMP isn't supported
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* A NAT gateway resource can use a:
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* Public IP
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* Public IP prefix
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* Virtual Network NAT is compatible with standard SKU public IP addresses or public IP prefix resources or a combination of both. You can use a public IP prefix directly or distribute the public IP addresses of the prefix across multiple NAT gateway resources. The NAT gateway will groom all traffic to the range of IP addresses of the prefix. Basic resources, such as basic load balancer or basic public IPs aren't compatible with Virtual Network NAT. Basic resources must be placed on a subnet not associated to a NAT gateway. Basic load balancer and basic public IP can be upgraded to standard to work with a NAT gateway.
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* Virtual Network NAT is compatible with standard SKU public IP addresses or public IP prefix resources or a combination of both. You can use a public IP prefix directly or distribute the public IP addresses of the prefix across multiple NAT gateway resources. The NAT gateway will groom all traffic to the range of IP addresses of the prefix. Basic resources, such as basic load balancer or basic public IPs aren't compatible with Virtual Network NAT. Basic resources must be placed on a subnet not associated to a NAT gateway. Basic load balancer and basic public IP can be upgraded to standard to work with a NAT gateway
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* To upgrade a basic load balancer too standard, see [Upgrade a public Basic Azure Load Balancer](../../load-balancer/upgrade-basic-standard.md)
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* To upgrade a basic load balancer too standard, see [Upgrade a public basic Azure Load Balancer](../../load-balancer/upgrade-basic-standard.md)
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* To upgrade a basic public IP too standard, see [Upgrade a public IP address](../ip-services/public-ip-upgrade-portal.md)
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* Virtual Network NAT is the recommended method for outbound connectivity. A NAT gateway doesn't have the same limitations of SNAT port exhaustion as does [default outbound access](../ip-services/default-outbound-access.md) and [outbound rules of a load balancer](../../load-balancer/outbound-rules.md).
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* Virtual Network NAT is the recommended method for outbound connectivity. A NAT gateway doesn't have the same limitations of SNAT port exhaustion as does [default outbound access](../ip-services/default-outbound-access.md) and [outbound rules of a load balancer](../../load-balancer/outbound-rules.md)
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* To migrate outbound access to a NAT gateway from default outbound access or load balancer outbound rules, see [Migrate outbound access to Azure Virtual Network NAT](./tutorial-migrate-outbound-nat.md)
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* A NAT gateway can’t be associated to an IPv6 public IP address or IPv6 public IP prefix. It can be associated to a dual stack subnet.
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* A NAT gateway can’t be associated to an IPv6 public IP address or IPv6 public IP prefix. It can be associated to a dual stack subnet
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* A NAT gateway allows flows to be created from the virtual network to the services outside your virtual network. Return traffic from the Internet is only allowed in response to an active flow. Services outside your virtual network can’t initiate an inbound connection through NAT gateway.
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* A NAT gateway allows flows to be created from the virtual network to the services outside your virtual network. Return traffic from the Internet is only allowed in response to an active flow. Services outside your virtual network can’t initiate an inbound connection through NAT gateway
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* A NAT gateway can’t span multiple virtual networks.
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* A NAT gateway can’t span multiple virtual networks
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* Multiple NAT gateways can’t be attached to a single subnet.
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* Multiple NAT gateways can’t be attached to a single subnet
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* A NAT gateway can’t be deployed in a [gateway subnet](../../vpn-gateway/vpn-gateway-about-vpn-gateway-settings.md#gwsub)
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* The private side of a NAT gateway, virtual machine instances or other compute resources, sends TCP reset packets for attempts to communicate on a TCP connection that doesn't exist. An example is connections that have reached idle timeout. The next packet received will return a TCP reset to the private IP address to signal and force connection closure. The public side of a NAT gateway doesn't generate TCP reset packets or any other traffic. Only traffic produced by the customer's virtual network is emitted.
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* Virtual machine instances or other compute resources, send TCP reset packets or attempt to communicate on a TCP connection that doesn't exist. An example is connections that have reached idle timeout. The next packet received will return a TCP reset to the private IP address to signal and force connection closure. The public side of a NAT gateway doesn't generate TCP reset packets or any other traffic. Only traffic produced by the customer's virtual network is emitted
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* A default TCP idle timeout of 4 minutes is used and can be increased to up to 120 minutes. Any activity on a flow can also reset the idle timer, including TCP keepalives.
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* A default TCP idle timeout of 4 minutes is used and can be increased to up to 120 minutes. Any activity on a flow can also reset the idle timer, including TCP keepalives
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## Pricing and SLA
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## Next steps
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* Learn [how to get better outbound connectivity using an Azure NAT gateway](https://www.youtube.com/watch?v=2Ng_uM0ZaB4)
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* Learn about [NAT gateway resource](./nat-gateway-resource.md)
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* Learn more about [NAT gateway metrics](./nat-metrics.md)
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* To create and validate a NAT gateway, see [Tutorial: Create a NAT gateway using the Azure portal](tutorial-create-nat-gateway-portal.md)
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* To view a video on more information about Azure Virtual Network NAT, see [How to get better outbound connectivity using an Azure NAT gateway](https://www.youtube.com/watch?v=2Ng_uM0ZaB4)
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* Learn about the [NAT gateway resource](./nat-gateway-resource.md)
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