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• Microsoft Nlb Multicast Mac Address Free
• Microsoft Nlb Multicast Mac Address Range
• Microsoft Nlb Multicast Mac Address Converter
• Microsoft Nlb Multicast Mac Address Change

Jun 24, 2006 For example, if the NLB cluster node were configured with the number three as its priority (unique) number, then it would identify itself to the switch as being MAC address 02-03-c0-a8-02-0b. This allows the switch to happily enter the MAC Address in its table and have a one to one mapping of MAC Addresses to ports. The Network Load Balancing (NLB) feature distributes traffic across several servers by using the TCP/IP networking protocol. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers. As previously referenced, multicast NLB requires that you have a unicast IP address mapped to a multicast MAC address. If you have a Catalyst switch, you can follow the configuration in Catalyst Switches for Microsoft Network Load Balancing Configuration Example. The Nexus 7000 follows the same concept, but the configurations are different.

Applies to: Windows Server (Semi-Annual Channel), Windows Server 2016

In this topic, we provide you with an overview of the Network Load Balancing (NLB) feature in Windows Server 2016. You can use NLB to manage two or more servers as a single virtual cluster. NLB enhances the availability and scalability of Internet server applications such as those used on web, FTP, firewall, proxy, virtual private network (VPN), and other mission-critical servers.

Note

Windows Server 2016 includes a new Azure-inspired Software Load Balancer (SLB) as a component of the Software Defined Networking (SDN) infrastructure. Use SLB instead of NLB if you are using SDN, are using non-Windows workloads, need outbound network address translation (NAT), or need Layer 3 (L3) or non-TCP based load balancing. You can continue to use NLB with Windows Server 2016 for non-SDN deployments. For more information about SLB, see Software Load Balancing (SLB) for SDN.

The Network Load Balancing (NLB) feature distributes traffic across several servers by using the TCP/IP networking protocol. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers.

The servers in an NLB cluster are called hosts, and each host runs a separate copy of the server applications. NLB distributes incoming client requests across the hosts in the cluster. You can configure the load that is to be handled by each host. You can also add hosts dynamically to the cluster to handle increased load. NLB can also direct all traffic to a designated single host, which is called the default host.

NLB allows all of the computers in the cluster to be addressed by the same set of IP addresses, and it maintains a set of unique, dedicated IP addresses for each host. For load-balanced applications, when a host fails or goes offline, the load is automatically redistributed among the computers that are still operating. When it is ready, the offline computer can transparently rejoin the cluster and regain its share of the workload, which allows the other computers in the cluster to handle less traffic.

Practical applications

NLB is useful for ensuring that stateless applications, such as web servers running Internet Information Services (IIS), are available with minimal downtime, and that they are scalable (by adding additional servers as the load increases). The following sections describe how NLB supports high availability, scalability, and manageability of the clustered servers that run these applications.

High availability

A high availability system reliably provides an acceptable level of service with minimal downtime. To provide high availability, NLB includes built-in features that can automatically:

• Detect a cluster host that fails or goes offline, and then recover.

• Balance the network load when hosts are added or removed.

• Recover and redistribute the workload within ten seconds.

Scalability

Scalability is the measure of how well a computer, service, or application can grow to meet increasing performance demands. For NLB clusters, scalability is the ability to incrementally add one or more systems to an existing cluster when the overall load of the cluster exceeds its capabilities. To support scalability, you can do the following with NLB:

• Balance load requests across the NLB cluster for individual TCP/IP services.

• Support up to 32 computers in a single cluster.

• Balance multiple server load requests (from the same client or from several clients) across multiple hosts in the cluster.

• Add hosts to the NLB cluster as the load increases, without causing the cluster to fail.

• Remove hosts from the cluster when the load decreases.

• Enable high performance and low overhead through a fully pipelined implementation. Pipelining allows requests to be sent to the NLB cluster without waiting for a response to a previous request.

Manageability

To support manageability, you can do the following with NLB:

• Manage and configure multiple NLB clusters and the cluster hosts from a single computer by using NLB Manager or the Network Load Balancing (NLB) Cmdlets in Windows PowerShell.

• Specify the load balancing behavior for a single IP port or group of ports by using port management rules.

• Define different port rules for each website. If you use the same set of load-balanced servers for multiple applications or websites, port rules are based on the destination virtual IP address (using virtual clusters).

• Direct all client requests to a single host by using optional, single-host rules. NLB routes client requests to a particular host that is running specific applications.

• Block undesired network access to certain IP ports.

• Enable Internet Group Management Protocol (IGMP) support on the cluster hosts to control switch port flooding (where incoming network packets are sent to all ports on the switch) when operating in multicast mode.

• Start, stop, and control NLB actions remotely by using Windows PowerShell commands or scripts.

• View the Windows Event Log to check NLB events. NLB logs all actions and cluster changes in the event log.

Important functionality

NLB is installed as a standard Windows Server networking driver component. Its operations are transparent to the TCP/IP networking stack. The following figure shows the relationship between NLB and other software components in a typical configuration.

Following are the primary features of NLB.

• Requires no hardware changes to run.

• Provides Network Load Balancing Tools to configure and manage multiple clusters and all of the hosts from a single remote or local computer.

• Enables clients to access the cluster by using a single, logical Internet name and virtual IP address, which is known as the cluster IP address (it retains individual names for each computer). NLB allows multiple virtual IP addresses for multihomed servers.

Note

When you deploy VMs as virtual clusters, NLB does not require servers to be multihomed to have multiple virtual IP addresses.

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• Enables NLB to be bound to multiple network adapters, which enables you to configure multiple independent clusters on each host. Support for multiple network adapters differs from virtual clusters in that virtual clusters allow you to configure multiple clusters on a single network adapter.

• Requires no modifications to server applications so that they can run in an NLB cluster.

• Can be configured to automatically add a host to the cluster if that cluster host fails and is subsequently brought back online. The added host can start handling new server requests from clients.

• Enables you to take computers offline for preventive maintenance without disturbing the cluster operations on the other hosts.

Hardware requirements

Following are the hardware requirements to run an NLB cluster.

• All hosts in the cluster must reside on the same subnet.

• There is no restriction on the number of network adapters on each host, and different hosts can have a different number of adapters.

• Within each cluster, all network adapters must be either multicast or unicast. NLB does not support a mixed environment of multicast and unicast within a single cluster.

• If you use the unicast mode, the network adapter that is used to handle client-to-cluster traffic must support changing its media access control (MAC) address.

Software requirements

Following are the software requirements to run an NLB cluster.

• Only TCP/IP can be used on the adapter for which NLB is enabled on each host. Do not add any other protocols (for example, IPX) to this adapter.

• The IP addresses of the servers in the cluster must be static.

Note

NLB does not support Dynamic Host Configuration Protocol (DHCP). NLB disables DHCP on each interface that it configures.

Installation information

You can install NLB by using either Server Manager or the Windows PowerShell commands for NLB.

Optionally you can install the Network Load Balancing Tools to manage a local or remote NLB cluster. The tools include Network Load Balancing Manager and the NLB Windows PowerShell commands.

Installation with Server Manager

In Server Manager, you can use the Add Roles and Features Wizard to add the Network Load Balancing feature. When you complete the wizard, NLB is installed, and you do not need to restart the computer.

Installation with Windows PowerShell

To install NLB by using Windows PowerShell, run the following command at an elevated Windows PowerShell prompt on the computer where you want to install NLB.

Microsoft Nlb Multicast Mac Address Free

After installation is complete, no restart of the computer is required.

Microsoft Nlb Multicast Mac Address Range

For more information, see Install-WindowsFeature.

Network Load Balancing Manager

To open Network Load Balancing Manager in Server Manager, click Tools, and then click Network Load Balancing Manager.

Additional resources

The following table provides links to additional information about the NLB feature.

Content type	References
Deployment	Network Load Balancing Deployment Guide Configuring Network Load Balancing with Terminal Services
Operations	Managing Network Load Balancing Clusters Setting Network Load Balancing Parameters Controlling Hosts on Network Load Balancing Clusters
Troubleshooting	Troubleshooting Network Load Balancing Clusters NLB Cluster Events and Errors
Tools and settings	Network Load Balancing Windows PowerShell cmdlets
Community resources	High Availability (Clustering) Forum

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by Walter Oliver

Introduction

Network load balancing (NLB) in Windows Server速 2008 provides traffic distribution using TCP/IP and can be used with the IIS shared configuration feature to create a Web farm that provides redundancy and fault-tolerance. NLB works by balancing traffic between the nodes in a Web farm or cluster. Servers emit a heartbeat message to other hosts in the cluster and listen for the heartbeat of other hosts. If a host fails, the remaining hosts adjust and redistribute the workload.

NLB does not monitor the health of your application. Instead, it allows the application developer to determine how healthy a load-balanced application is. Since each application has its own notion of load and health, measuring and monitoring these quantities is best achieved by the application itself. By using collected measurements from your application and the NLB public WMI provider, it is a relatively simple task to add load and health monitoring to your load-balanced application.

Note

It is recommended that the servers have two networks. One is for the public cluster IP address that is shared by every host or node in the cluster. This will likely be used as the IP for Web sites on the server. The second one is for private traffic between the nodes of a Web farm. For example, if the server is using an internal network for traffic to internal resources like the file server or Active Directory servers, this could be used for traffic between the nodes.

Installing and Configuring

To install NLB

1. Navigate to Administrative Tools and click Server Manager.
2. Scroll down to the Features section or click the Features node in the left-hand tree view.
3. Click Add Features.
4. In the Add Features Wizard, select Network Load Balancing from the list of available optional components.
5. Click Next, and Install, as applicable to complete the wizard.

Microsoft Nlb Multicast Mac Address Converter

To configure NLB

Microsoft Nlb Multicast Mac Address Change

1. Navigate to Administrative Tools and click Network Load Balancing Manager, or run nlbmgr from a command prompt.

2. Right-click Network Load Balancing Clusters and click New Cluster.

3. Connect to the host that will be part of the cluster, in this case the Web server. In the Host text box, type the name of the host, and then click Connect.

4. Select the interface you want to use with the cluster, and then click Next.

5. On the Host Parameters page, select a value from the Priority (unique host identifier) drop-down list.

6. In the Dedicated IP Addresses area, click Add to type the IP address that is shared by every host in the cluster. NLB will add this IP address to the TCP/IP stack on the selected interface of all hosts chosen to be part of the cluster. Click Next to continue.

7. On the Cluster IP Addresses page, click Add.

8. In the Add IP Address dialog box, type the IP address and subnet mask, and then click OK.

9. Click Next.

10. On the Cluster Parameters page, in the Cluster operation mode area, click Unicast to specify that a unicast media access control (MAC) address should be used for cluster operations. Click Next to continue.

11. On the Port Rules page, click Edit to modify the default port rules if you need advanced rules. Otherwise, use the default.

12. Click Finish to create the cluster.

    To add more hosts to the cluster, right-click the new cluster, and then click Add Host to Cluster.