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added include file blurb for basic sku
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‎articles/load-balancer/load-balancer-configure-sqlao.md

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# Configure load balancer for SQL always on
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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SQL Server AlwaysOn Availability Groups can now be run with ILB. Availability Group is SQL Server's flagship solution for high availability and disaster recovery. The Availability Group Listener allows client applications to seamlessly connect to the primary replica, irrespective of the number of the replicas in the configuration.
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The listener (DNS) name is mapped to a load-balanced IP address and Azure's load balancer directs the incoming traffic to only the primary server in the replica set.

‎articles/load-balancer/load-balancer-custom-probe-overview.md

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# Understand load balancer probes
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Azure Load Balancer offers the capability to monitor the health of server instances by using probes. When a probe fails to respond, Load Balancer stops sending new connections to the unhealthy instance. The existing connections are not affected, and new connections are sent to healthy instances.
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Cloud service roles (worker roles and web roles) use a guest agent for probe monitoring. TCP or HTTP custom probes must be configured when you use virtual machines behind Load Balancer.

‎articles/load-balancer/load-balancer-distribution-mode.md

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# Configure the distribution mode for load balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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## Hash-based distribution mode
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The default distribution algorithm is a 5-tuple (source IP, source port, destination IP, destination port, protocol type) hash to map traffic to available servers. It provides stickiness only within a transport session. Packets in the same session will be directed to the same datacenter IP (DIP) instance behind the load balanced endpoint. When the client starts a new session from the same source IP, the source port changes and causes the traffic to go to a different DIP endpoint.

‎articles/load-balancer/load-balancer-get-started-ilb-arm-cli.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-ilb-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-ilb-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-ilb-intro-include.md](../../includes/load-balancer-get-started-ilb-intro-include.md)]
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> [!NOTE]

‎articles/load-balancer/load-balancer-get-started-ilb-arm-portal.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-ilb-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-ilb-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-ilb-intro-include.md](../../includes/load-balancer-get-started-ilb-intro-include.md)]
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> [!NOTE]

‎articles/load-balancer/load-balancer-get-started-ilb-arm-ps.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-ilb-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-ilb-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-ilb-intro-include.md](../../includes/load-balancer-get-started-ilb-intro-include.md)]
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> [!NOTE]

‎articles/load-balancer/load-balancer-get-started-ilb-arm-template.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-ilb-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-ilb-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-ilb-intro-include.md](../../includes/load-balancer-get-started-ilb-intro-include.md)]
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> [!NOTE]

‎articles/load-balancer/load-balancer-get-started-internet-arm-cli.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-internet-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-internet-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-internet-intro-include.md](../../includes/load-balancer-get-started-internet-intro-include.md)]
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[!INCLUDE [azure-arm-classic-important-include](../../includes/azure-arm-classic-important-include.md)]

‎articles/load-balancer/load-balancer-get-started-internet-arm-ps.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-internet-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-internet-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-internet-intro-include.md](../../includes/load-balancer-get-started-internet-intro-include.md)]
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[!INCLUDE [azure-arm-classic-important-include](../../includes/azure-arm-classic-important-include.md)]

‎articles/load-balancer/load-balancer-get-started-internet-arm-template.md

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> * [Azure CLI](../load-balancer/load-balancer-get-started-internet-arm-cli.md)
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> * [Template](../load-balancer/load-balancer-get-started-internet-arm-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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[!INCLUDE [load-balancer-get-started-internet-intro-include.md](../../includes/load-balancer-get-started-internet-intro-include.md)]
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[!INCLUDE [azure-arm-classic-important-include](../../includes/azure-arm-classic-important-include.md)]

‎articles/load-balancer/load-balancer-internal-overview.md

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# Internal load balancer overview
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Unlike the Internet facing load balancer, the internal load balancer (ILB) directs traffic only to resources inside the cloud service or using VPN to access the Azure infrastructure. The infrastructure restricts access to the load balanced virtual IP addresses (VIPs) of a Cloud Service or a Virtual Network so that they will never be directly exposed to an Internet endpoint. This enables internal line of business (LOB) applications to run in Azure and be accessed from within the cloud or from resources on-premises.
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## Why you may need an internal load balancer

‎articles/load-balancer/load-balancer-internet-overview.md

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# Internet facing load balancer overview
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Azure load balancer maps the public IP address and port number of incoming traffic to the private IP address and port number of the virtual machine and vice versa for the response traffic from the virtual machine. Load balancing rules allow you to distribute specific types of traffic between multiple virtual machines or services. For example, you can spread the load of web request traffic across multiple web servers or web roles.
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For a cloud service that contains instances of web roles or worker roles, you can define a public endpoint in the service definition (.csdef) file.

‎articles/load-balancer/load-balancer-ipv6-for-linux.md

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# Configuring DHCPv6 for Linux VMs
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Some of the Linux virtual machine images in the Azure Marketplace do not have DHCPv6 configured by default. To support IPv6, DHCPv6 must be configured in within the Linux OS distribution that you are using. Different Linux distributions have different ways of configuring DHCPv6 because they use different packages.
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> [!NOTE]

‎articles/load-balancer/load-balancer-ipv6-internet-cli.md

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> * [Azure CLI](load-balancer-ipv6-internet-cli.md)
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> * [Template](load-balancer-ipv6-internet-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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An Azure load balancer is a Layer-4 (TCP, UDP) load balancer. The load balancer provides high availability by distributing incoming traffic among healthy service instances in cloud services or virtual machines in a load balancer set. Azure Load Balancer can also present those services on multiple ports, multiple IP addresses, or both.
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## Example deployment scenario

‎articles/load-balancer/load-balancer-ipv6-internet-ps.md

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> * [Azure CLI](load-balancer-ipv6-internet-cli.md)
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> * [Template](load-balancer-ipv6-internet-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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An Azure load balancer is a Layer-4 (TCP, UDP) load balancer. The load balancer provides high availability by distributing incoming traffic among healthy service instances in cloud services or virtual machines in a load balancer set. Azure Load Balancer can also present those services on multiple ports, multiple IP addresses, or both.
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## Example deployment scenario

‎articles/load-balancer/load-balancer-ipv6-internet-template.md

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> * [Azure CLI](load-balancer-ipv6-internet-cli.md)
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> * [Template](load-balancer-ipv6-internet-template.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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An Azure load balancer is a Layer-4 (TCP, UDP) load balancer. The load balancer provides high availability by distributing incoming traffic among healthy service instances in cloud services or virtual machines in a load balancer set. Azure Load Balancer can also present those services on multiple ports, multiple IP addresses, or both.
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## Example deployment scenario

‎articles/load-balancer/load-balancer-ipv6-overview.md

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# Overview of IPv6 for Azure Load Balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Internet-facing load balancers can be deployed with an IPv6 address. In addition to IPv4 connectivity, this enables the following capabilities:
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* Native end-to-end IPv6 connectivity between public Internet clients and Azure Virtual Machines (VMs) through the load balancer.

‎articles/load-balancer/load-balancer-monitor-log.md

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# Log analytics for Azure Load Balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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You can use different types of logs in Azure to manage and troubleshoot load balancers. Some of these logs can be accessed through the portal. All logs can be extracted from Azure blob storage, and viewed in different tools, such as Excel and PowerBI. You can learn more about the different types of logs from the list below.
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* **Audit logs:** You can use [Azure Audit Logs](../monitoring-and-diagnostics/insights-debugging-with-events.md) (formerly known as Operational Logs) to view all operations being submitted to your Azure subscription(s), and their status. Audit logs are enabled by default, and can be viewed in the Azure portal.

‎articles/load-balancer/load-balancer-multiple-ip-cli.md

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> * [CLI](load-balancer-multiple-ip-cli.md)
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> * [PowerShell](load-balancer-multiple-ip-powershell.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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This article describes how to use Azure Load Balancer with multiple IP addresses on a secondary network interface (NIC). For this scenario, we have two VMs running Windows, each with a primary and a secondary NIC. Each of the secondary NICs have two IP configurations. Each VM hosts both websites contoso.com and fabrikam.com. Each website is bound to one of the IP configurations on the secondary NIC. We use Azure Load Balancer to expose two frontend IP addresses, one for each website, to distribute traffic to the respective IP configuration for the website. This scenario uses the same port number across both frontends, as well as both backend pool IP addresses.
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![LB scenario image](./media/load-balancer-multiple-ip/lb-multi-ip.PNG)

‎articles/load-balancer/load-balancer-multiple-ip-powershell.md

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> * [CLI](load-balancer-multiple-ip-cli.md)
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> * [PowerShell](load-balancer-multiple-ip-powershell.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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This article describes how to use Azure Load Balancer with multiple IP addresses on a secondary network interface (NIC). For this scenario, we have two VMs running Windows, each with a primary and a secondary NIC. Each of the secondary NICs have two IP configurations. Each VM hosts both websites contoso.com and fabrikam.com. Each website is bound to one of the IP configurations on the secondary NIC. We use Azure Load Balancer to expose two frontend IP addresses, one for each website, to distribute traffic to the respective IP configuration for the website. This scenario uses the same port number across both frontends, as well as both backend pool IP addresses.
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![LB scenario image](./media/load-balancer-multiple-ip/lb-multi-ip.PNG)

‎articles/load-balancer/load-balancer-multiple-ip.md

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> * [PowerShell](load-balancer-multiple-ip-powershell.md)
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> * [CLI](load-balancer-multiple-ip-cli.md)
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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This article describes how to use Azure Load Balancer with multiple IP addresses on a secondary network interface (NIC).For this scenario, we have two VMs running Windows, each with a primary and a secondary NIC. Each of the secondary NICs have two IP configurations. Each VM hosts both websites contoso.com and fabrikam.com. Each website is bound to one of the IP configurations on the secondary NIC. We use Azure Load Balancer to expose two frontend IP addresses, one for each website, to distribute traffic to the respective IP configuration for the website. This scenario uses the same port number across both frontends, as well as both backend pool IP addresses.
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![LB scenario image](./media/load-balancer-multiple-ip/lb-multi-ip.PNG)

‎articles/load-balancer/load-balancer-multivip-overview.md

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# Multiple VIPs for Azure Load Balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Azure Load Balancer allows you to load balance services on multiple ports, multiple IP addresses, or both. You can use public and internal load balancer definitions to load balance flows across a set of VMs.
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This article describes the fundamentals of this ability, important concepts, and constraints. If you only intend to expose services on one IP address, you can find simplified instructions for [public](load-balancer-get-started-internet-portal.md) or [internal](load-balancer-get-started-ilb-arm-portal.md) load balancer configurations. Adding Multiple VIPs is incremental to a single VIP configuration. Using the concepts in this article, you can expand a simplified configuration at any time.

‎articles/load-balancer/load-balancer-multivip.md

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# Configure multiple VIPs for a cloud service
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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You can access Azure cloud services over the public Internet by using an IP address provided by Azure. This public IP address is referred to as a VIP (virtual IP) since it is linked to the Azure load balancer, and not the Virtual Machine (VM) instances within the cloud service. You can access any VM instance within a cloud service by using a single VIP.
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However, there are scenarios in which you may need more than one VIP as an entry point to the same cloud service. For instance, your cloud service may host multiple websites that require SSL connectivity using the default port of 443, as each site is hosted for a different customer, or tenant. In this scenario, you need to have a different public facing IP address for each website. The diagram below illustrates a typical multi-tenant web hosting with a need for multiple SSL certificates on the same public port.

‎articles/load-balancer/load-balancer-outbound-connections.md

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# Understanding outbound connections in Azure
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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A Virtual Machine (VM) in Azure can communicate with endpoints outside of Azure in public IP address space. When a VM initiates an outbound flow to a destination in public IP address space, Azure maps the VM's private IP address to a public IP address and allows return traffic to reach the VM.
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Azure provides three different methods to achieve outbound connectivity. Each method has its own capabilities and constraints. Review each method carefully to choose which one meets your needs.

‎articles/load-balancer/load-balancer-overview.md

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Azure Load Balancer delivers high availability and network performance to your applications. It is a Layer 4 (TCP, UDP) load balancer that distributes incoming traffic among healthy instances of services defined in a load-balanced set.
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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Azure Load Balancer can be configured to:
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* Load balance incoming Internet traffic to virtual machines. This configuration is known as [Internet-facing load balancing](load-balancer-internet-overview.md).
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---
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title: Azure Standard Load Balancer overview | Microsoft Docs
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description: Overview of Azure Standard Load Balancer features
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services: load-balancer
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documentationcenter: na
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author: kumudd
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manager: timlt
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editor: ''
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ms.assetid:
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ms.service: load-balancer
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ms.devlang: na
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ms.topic: article
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ms.tgt_pltfrm: na
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ms.workload: infrastructure-services
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ms.date: 08/23/17
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ms.author: kumud
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---
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# Azure Standard Load Balancer overview
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TBD
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## Next steps
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- Create an [Internet-facing load balancer](load-balancer-get-started-internet-portal.md)
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- Learn about some of the other key [networking capabilities](../networking/networking-overview.md) of Azure
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‎articles/load-balancer/load-balancer-tcp-idle-timeout.md

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# Configure TCP idle timeout settings for Azure Load Balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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In its default configuration, Azure Load Balancer has an idle timeout setting of 4 minutes. If a period of inactivity is longer than the timeout value, there's no guarantee that the TCP or HTTP session is maintained between the client and your cloud service.
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When the connection is closed, your client application may receive the following error message: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server."

‎articles/load-balancer/load-balancer-troubleshoot.md

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# Troubleshoot Azure Load Balancer
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[!INCLUDE [load-balancer-basic-sku-include.md](../../includes/load-balancer-basic-sku-include.md)]
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This page provides troubleshooting information for common Azure Load Balancer questions. When the Load Balancer connectivity is unavailable, the most common symptoms are as follows:
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- VMs behind the Load Balancer are not responding to health probes
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- VMs behind the Load Balancer are not responding to the traffic on the configured port
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Azure Load Balancer supports two types of load balancers: Basic Load Balancer and Standard Load Balancer. This article discusses Basic Load Balancers. For more information about Standard Load Balancers, see [Overview of Standard Load Balancer](load-balancer-standard-overview.md).
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This Standard Load Balancer Public Preview may not have the same level of availability and reliability as features that are in general availability release. The feature is not supported, may have constrained capabilities, and may not be available in all Azure locations. For the most up-to-date notifications on availability and status of this feature, check the [Azure Load Balancer updates](https://azure.microsoft.com/en-us/updates/?product=load-balancer) page.

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