Network Load Balancing

Network Load Balancing is a clustering technology. NLB uses a distributed algorithm to balance network traffic across a number of hosts, helping to enhance the scalability and availability of mission-critical, IP-based services, such as Web, Virtual Private Networking, etc. It also provides high availability by detecting host failures and automatically redistributing traffic to operational hosts.

Benefits of Network Load Balancing

Network Load Balancing servers (also called hosts) in a cluster communicate among themselves to provide essential benefits
Network Load Balancing scales the performance of a server-based program, such as a Web server, by distributing its client requests across multiple servers within the cluster. As traffic increases, additional servers can be added to the cluster.
High availability
High availability
Network Load Balancing provides high availability by automatically detecting the failure of a server and repartitioning client traffic among the remaining servers within ten seconds while providing users with continuous service.
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.

Network Load Balancing Solution

Please contact us for a quote based on your needs.
Network PC

Solution 1 - IIS ARR + Microsoft NLB + IIS

Making IIS website Highly Available using IIS ARR and Microsoft NLB. Applies to: Windows Server 2022/2019/2016, IIS 7.0 and above.
Example of implementation
Configure ARR1+NLB, ARR2+NLB to be Windows Load Balancing servers, which provides high availability and scalability for the content servers. ARR is built as a module on top of IIS and is designed to make the routing decisions at layer 7 (application). NLB makes the routing decisions at layer 3.

Solution 2 - LVS/HAProxy + Keepalived + Nginx

Making Nginx website Highly Available using LVS/HAProxy and Keepalived. Applies to: CentOS 8.x/7.x, Ubuntu 20.x/18.x LTS
Implementation example
Prepare 7 CentOS 7.x hosts and a virtual IP(VIP) address:
The load balancer will use 2 hosts, one primary and one standby
lb1 (default primary):
lb2 (default standby):
The back-end web servers powered by nginx
web servers: Web-1 Web-2 Web-3
image servers: Img-1 Img-2

Network Load Balancing FAQs

Frequently asked questions about our Network Load Balancing service

What is a Network Load Balancing (NLB) technology?

Network Load Balancing (NLB) is a feature that distributes network traffic among multiple servers or virtual machines within a cluster to avoid overloading any one host and improve performance.

When would you use an NLB?

When you need to seamlessly support spiky or high-volume inbound TCP reanswerts.When you need to support a static or elastic IP address.If you are using container services and/or want to support more than one port on a VPS instance.

What is ARR load balancing?

Application Reanswert Routing (ARR) is a Microsoft Internet Information Services (IIS) feature that you can use to enable SnapCenter load balancing across multiple servers with a user interface. Network Load Balancing (NLB) is a Microsoft feature that SnapCenter uses to provide server high availability.

What is Linux Virtual Server (LVS)?

LVS is a free and open-source project started by Wensong Zhang in May 1998, subject to the requirements of the GNU General Public License (GPL), version 2. The mission of the project is to build a high-performance and highly available server for Linux using clustering technology, which provides good scalability, reliability and serviceability.

How does an NLB work?

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.

What are the benefits of network load balancing?

Load balancing lets you evenly distribute network traffic to prevent failure caused by overloading a particular resource. This strategy improves the performance and availability of applications, websites, databases, and other computing resources. It also helps process user reanswerts quickly and accurately.

What is HAProxy?

HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers a significant portion of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms.

Releated articles

Useful Resources about our NLB service
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