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Copy file name to clipboardExpand all lines: articles/vpn-gateway/vpn-gateway-about-vpngateways.md
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title: 'Azure VPN Gateway | Microsoft Docs'
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title: 'About Azure VPN Gateway'
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description: Learn about what a VPN gateway is and the ways you can use a VPN gateway to connect to Azure virtual networks. Including IPsec/IKE Site-to-Site cross-premises and VNet-to-VNet solutions, as well as Point-to-Site VPN.
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services: vpn-gateway
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author: cherylmc
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Customer intent: As someone with a basic network background, but is new to Azure, I want to understand the capabilities of Azure VPN Gateway so that I can securely connect to my Azure virtual networks.
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ms.service: vpn-gateway
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ms.topic: overview
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ms.date: 10/31/2019
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ms.date: 11/13/2019
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ms.author: cherylmc
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---
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## <aname="gwsku"></a>Gateway SKUs
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When you create a virtual network gateway, you specify the gateway SKU that you want to use. Select the SKU that satisfies your requirements based on the types of workloads, throughputs, features, and SLAs. For more information about gateway SKUs, including supported features, production and dev-test, and configuration steps, see the [VPN Gateway Settings - Gateway SKUs](vpn-gateway-about-vpn-gateway-settings.md#gwsku) article. For Legacy SKU information, see [Working with Legacy SKUs](vpn-gateway-about-skus-legacy.md).
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When you create a virtual network gateway, you specify the gateway SKU that you want to use. Select the SKU that satisfies your requirements based on the types of workloads, throughputs, features, and SLAs.
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* For more information about gateway SKUs, including supported features, production and dev-test, and configuration steps, see the [VPN Gateway Settings - Gateway SKUs](vpn-gateway-about-vpn-gateway-settings.md#gwsku) article.
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* For Legacy SKU information, see [Working with Legacy SKUs](vpn-gateway-about-skus-legacy.md).
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### <aname="benchmark"></a>Gateway SKUs by tunnel, connection, and throughput
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Unlike S2S connections, P2S connections do not require an on-premises public-facing IP address or a VPN device. P2S connections can be used with S2S connections through the same VPN gateway, as long as all the configuration requirements for both connections are compatible. For more information about Point-to-Site connections, see [About Point-to-Site VPN](point-to-site-about.md).
Copy file name to clipboardExpand all lines: includes/vpn-gateway-faq-ipsecikepolicy-include.md
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ms.custom: include file
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### Is Custom IPsec/IKE policy supported on all Azure VPN Gateway SKUs?
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Custom IPsec/IKE policy is supported on Azure **VpnGw1, VpnGw2, VpnGw3, Standard**, and **HighPerformance** VPN gateways. The **Basic** SKU is **not** supported.
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Custom IPsec/IKE policy is supported on all Azure SKUs except the Basic SKU.
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### How many policies can I specify on a connection?
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You can only specify ***one*** policy combination for a given connection.
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### What are the algorithms and key strengths supported in the custom policy?
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The following table lists the supported cryptographic algorithms and key strengths configurable by the customers. You must select one option for every field.
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|**IPsec/IKEv1, IKEv2**|**Options**|
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| --- | --- |
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|IKEv1, IKEv2 Encryption | AES256, AES192, AES128, DES3, DES |
> 1. DHGroup2048 & PFS2048 are the same as Diffie-Hellman Group **14** in IKE and IPsec PFS. See [Diffie-Hellman Groups](#DH) for the complete mappings.
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> 2. For GCMAES algorithms, you must specify the same GCMAES algorithm and key length for both IPsec Encryption and Integrity.
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> 3.IKEv1 and IKEv2 Main Mode SA lifetime is fixed at 28,800 seconds on the Azure VPN gateways.
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> 3. IKEv2 Main Mode SA lifetime is fixed at 28,800 seconds on the Azure VPN gateways.
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> 4. QM SA Lifetimes are optional parameters. If none was specified, default values of 27,000 seconds (7.5 hrs) and 102400000 KBytes (102GB) are used.
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> 5. UsePolicyBasedTrafficSelector is an option parameter on the connection. See the next FAQ item for "UsePolicyBasedTrafficSelectors"
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author: cherylmc
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ms.service: vpn-gateway
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ms.topic: include
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ms.date: 11/04/2019
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ms.date: 11/12/2019
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ms.author: cherylmc
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ms.custom: include file
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---
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When you create a virtual network gateway, you need to specify the gateway SKU that you want to use. Select the SKU that satisfies your requirements based on the types of workloads, throughputs, features, and SLAs. For virtual network gateway SKUs in Azure Availability Zones, see [Azure Availability Zones Gateway SKUs](../articles/vpn-gateway/about-zone-redundant-vnet-gateways.md).
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When you create a virtual network gateway, you need to specify the gateway SKU that you want to use. Select the SKU that satisfies your requirements based on the types of workloads, throughputs, features, and SLAs. For virtual network gateway SKUs in Azure Availability Zones, see [Azure Availability Zones gateway SKUs](../articles/vpn-gateway/about-zone-redundant-vnet-gateways.md).
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### <aname="benchmark"></a>Gateway SKUs by tunnel, connection, and throughput
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[!INCLUDE [Aggregated throughput by SKU](./vpn-gateway-table-gwtype-aggtput-include.md)]
> VpnGw SKUs (VpnGw1, VpnGw1AZ, VpnGw2, VpnGw2AZ, VpnGw3, VpnGw3AZ, VpnGw4, VpnGw4AZ, VpnGw5, and VpnGw5AZ) are supported for the Resource Manager deployment model only. Classic virtual networks should continue to use the old (legacy) SKUs.
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> * For information about working with the legacy gateway SKUs (Basic, Standard, and HighPerformance), see [Working with VPN gateway SKUs (legacy SKUs)](../articles/vpn-gateway/vpn-gateway-about-skus-legacy.md).
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> * For ExpressRoute gateway SKUs, see [Virtual Network Gateways for ExpressRoute](../articles/expressroute/expressroute-about-virtual-network-gateways.md).
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>
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### <aname="feature"></a>Gateway SKUs by feature set
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* On a single tunnel a maximum of 1 Gbps throughput can be achieved. Aggregate Throughput Benchmark in the above table is based on measurements of multiple tunnels aggregated through a single gateway. The Aggregate Throughput Benchmark for a VPN Gateway is S2S + P2S combined. **If you have a lot of P2S connections, it can negatively impact a S2S connection due to throughput limitations.** The Aggregate Throughput Benchmark is not a guaranteed throughput due to Internet traffic conditions and your application behaviors.
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*To help our customers understand the relative performance of SKUs using different algorithms, we used publicly available iPerf and CTSTraffic tools to measure performances. The table below lists the results of performance tests for Generation 1, VpnGw SKUs. As you can see, the best performance is obtained when we used GCMAES256 algorithm for both IPsec Encryption and Integrity. We got average performance when using AES256 for IPsec Encryption and SHA256 for Integrity. When we used DES3 for IPsec Encryption and SHA256 for Integrity we got lowest performance.
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To help our customers understand the relative performance of SKUs using different algorithms, we used publicly available iPerf and CTSTraffic tools to measure performances. The table below lists the results of performance tests for Generation 1, VpnGw SKUs. As you can see, the best performance is obtained when we used GCMAES256 algorithm for both IPsec Encryption and Integrity. We got average performance when using AES256 for IPsec Encryption and SHA256 for Integrity. When we used DES3 for IPsec Encryption and SHA256 for Integrity we got lowest performance.
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|**Generation**|**SKU**|**Algorithms<br>used**|**Throughput<br>observed**|**Packets per second<br>observed**|
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