How to deal with low network performance Hyper-V

Original author: Marissa Comeau
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Network performance can “make” your virtual environment or disrupt its operation. With Hyper-V networking tools, you can maintain high network performance and evenly distribute resources. Although you should not remind about this, virtual networks can have a serious impact on physical servers and, therefore, on your virtual environment. Although virtualization has numerous advantages, its main disadvantage is that it introduces new virtual machines that consume valuable resources, such as bandwidth and occupy the input / output systems of the physical server, which leads to poor performance.

This problem is exacerbated when multiple virtual servers compete for a single communications system, resulting in massive delays. One solution to this problem is to logically distribute network resources using tools such as virtual switches and virtual network cards.

Designed to help users create and manage virtual environments, the Hyper-V hypervisor includes tools to address these issues and control resource allocation. Since  Hyper-V Port Mirroring and ending logic networks Hyper-VThere are several ways to ensure that your virtual networks - and, in turn, the virtual environment - are at peak performance levels. Below are 5 tips to reduce the number of Hyper-V network performance issues .

Hyper-V Port Mirroring Simplifies Network Traffic

When it comes to working with virtual machines as part of a multi-tier virtual network architecture, just keeping a close eye on the load is not only important, but also necessary. Port Mirroring, included with Windows Server 2012 Hyper-V , captures network traffic from virtual machines in Windows Server 2012 and transfers this information to the virtual machines configured for monitoring. Port Mirroring can control internal traffic from virtual machines connected to a virtual switch, and external traffic from a physical server to a virtual machine. In addition to this, Port Mirroring can also be used to capture tagged VLAN traffic, as well as block unwanted network traffic, eliminating poor network performance. Using Hyper-V Port Mirroring administrators can easily optimize network performance while ensuring security and assessing potential network problems.

Virtual switches

As you know, a virtual network connection is established and managed in a Hyper-V environment using Hyper-V Manager technology . With  Hyper-V Manager, administrators can configure and manage virtual switches through which all host operating system messages pass. In the Hyper-V environment, there are three types of virtual switches, each of which performs several different tasks, from the ability to connect to a physical network to work with network segments isolated from the  host server . When used effectively, these switches can improve Hyper-V network performance while increasing security all the time.

Enhanced Network Security with  Hyper-V

With the release of Windows Server 2012, a new version of Hyper-V was also released with several significant changes and a number of new features. The new version includes advanced network functions, including Router Guard and Dynamic Host Configuration Protocol (DHCP) Guard, which can be accessed using Hyper-V Manager technology . The first prevents the virtual machine from functioning as a router by eliminating router messages and forwarded messages. This creates an extra layer of security if your computer’s OS is at risk.

The latter, DHCP Guard, has several potential uses. DHCP Guard authorizes DHCP serversActive Directory level, preventing access to spoofed DHCP servers. It also imposes restrictions on authorized DHCP servers , limiting their capabilities. As a result, both Router Guard and DHCP Guard strengthen the protection of virtual machines in a virtual network environment from illegal network services.

Hyper-V logical networks and virtualization scaling

Despite its usefulness, Hyper-V Manager is not suitable for network environments of any size. Hyper-V Manager can only function as a server-level management tool, which makes it incompatible with larger environments. In order to move virtual machines from one host to another using Hyper-V Manager, you need to make several identical virtual switches, which takes a lot of time. Earlier Hyper-V virtual networks also face problems in multi-tenant environments. If you intend to work with a large network environment, you will need to build a Hyper-V Manager logical network to scale connections.

Logical networks exclude local networks by grouping virtual local networks and subnets in order to assign them to host groups. Logical networks are defined and managed by Microsoft System Center Virtual Machine Manager. In order to take full advantage of the logical network and prevent a decrease in network performance, you will also need to create a network of virtual machines and define logical switches to work on your logical network. Once all the necessary parts for building and starting the logical network are assembled, you can reuse these components in the future when creating new managed networks.

Squeeze of  Hyper-V utmost

When it comes to preventing conflicts on a physical server, avoiding the low network performance of Hyper-V  is just the beginning. You will want to make sure that your virtual environments look decent at all levels. This means making performance adjustments for Hyper-V dynamic migration , removing background activities, and tuning hardware acceleration tools to speed up GPU offloading, in addition to optimizing network performance.

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