What is Network Virtualization?

Photo of author

By admin

All About Network Virtualization

Network virtualization (NV) combines hardware, software, and network functionality of a computer system as part of a segmented operation to create a single virtual network. For the primitive functioning of the software, the engineers use this as a means of stimulation. Virtualization of a network can oversee and focus on traffic in segments of a network that may be split among multiple outer networks. By utilizing this capability, administrators can perform their duties more efficiently, manage assets, and ensure security. NVGRE was created by Microsoft primarily with the collaboration of Intel, Dell, and HP.

The Primary Characteristics of Network Virtualization using GRE:

  • Under GRE Network Virtualization uses MAC-in-IP tunneling.
  • Every network and overlay is known as a virtual layer of two networks.
  • GRE virtual networks are identified by a 24-bit Virtual Subnet Identifier.
  • The tunnels used in GRE in Network virtualization are stateless.

NV can streamline how advanced specialist co-ops use their worker assets, permit them to utilize standard workers for capacities that once required costly restrictive equipment, and by and large work on their organizations’ speed, adaptability, and dependability.

There are two classifications of Network Virtualization:

  • Internal Virtualization
    Interior virtualization is intended to utilize programming holders to repeat the usefulness of a solitary network .
  • External Virtualization
    External Virtualization can be described as the process of combining multiple local networks into a single “virtual” network in order to increase network efficiency.

Complementary Relation between Internal and External Virtualization

In addition to maximizing network virtualization, a number of organizations are leveraging cloud advances.
Network virtualization in cloud computing follows a similar approach, but it relies on cloud-based assets to function: outer and interior virtualization.

NV can logically join frameworks truly attached to a similar local area network (LAN) into isolated virtual local area networks (VLANs), or separate various LANs into a similar VLAN. Organizations can leverage it to develop a broad network’s proficiency.

In contrast to External Network Virtualization, which follows up on frameworks outside a solitary worker, Interior Network Virtualization works inside one server to copy an actual network. The process commonly involves the development of a worker with software holders to work on enhancing server proficiency. Using compartments, distinct applications can be contained or different working frameworks can run on the same worker.

Network Virtualization in Cloud Computing

NV is a cycle of consistently gathering actual networks and working them as single or different autonomous networks called Virtual Networks.

Tools for Network Virtualization :

  1. Physical switch OS
    Physical switch OS is basically the place where the OS should contain the functionality of network virtualization.
  2. Hypervisor –
    Under Hypervisor, systems administration and the functions of network virtualization are controlled from the outside.

The fundamental usefulness of the OS is to give the application or the executing system a straightforward arrangement of guidelines. Framework calls made by the OS and executed through the Libc library are equivalent to the assistance locals given at the interface between the application and the organization through the SAP (Service Access Point).

The Hypervisor is utilized to make a virtual switch and arrange virtual networks on it. Outsider programming is introduced on top of the hypervisor, replacing the local administration benefit of the hypervisor. We can run multiple virtual machines on a single piece of hardware using a hypervisor.

Network Virtualization in Virtual Data Centre:

  1. Physical Network
  • Network connectors, switches, spans, repeaters, switches, and hubs points are the fundamental actual segments.
  • It enables the connectivity among physical servers running a hypervisor, between physical servers and storage systems, and between physical servers and clients.
  1. VM Network
  • It consists of virtual switches.
  • It provides connectivity to the hypervisor kernel.
  • You can connect to the physical network.
  • Resides inside the physical server.

What are the Advantages and Disadvantages of Network Virtualization?


Improves manageability –
  • Grouping and regrouping of nodes are eased.
  • Configuration of VM is allowed from a centralized management workstation using management software.
Reduces CAPEX –
  • To set up a separate physical network it requires reducing the various node groups.
Improves utilization –
  • Multiple VMs are enabled to share the same physical network, which enhances the utilization of network resources.
Enhances performance –
  • It enhances the VM performance and also restricts the Network broadcast.
Enhances security –
  • The crucial data is moved from one virtual machine to another and hidden.
  • It also restricts the access to nodes in a VM from another VM.


  • It demands to maintain the IT in the abstract.
  • The cloud-integrated hybrid environment must exist side by side with actual devices.
  • Increased complexity.
  • Upfront cost.
  • Possible learning curve.

Practical Demonstration of Network Virtualization

L2TP (Layer 2 Tunneling Protocol) is a tunnelling protocol that can be used by VPNs or ISPs to deliver their services. There is no encryption or privacy provided by L2TP. For protection, it depends on an encryption convention that it passes through the passage.

  • PPP (Point-to-Point Protocol) is an information interface (layer 2) convention used to set up an immediate association between two nodes. This device connects two switches directly without the need for a host or any other networking device. The device can perform association confirmation, transmission encryption, and compression.
  • VLAN (Virtual Local Area Networks) is any broadcast domain partitioned and isolated in a computer network at the data link layer.

The Secure Sockets Layer (SSL) is a security innovation that provides an encrypted connection between a server and a client – normally a website and a program, or a mail worker and a mail client – by scrambling information over the transport layer.er.

Applications of Network Virtualization

  • NV might be utilized in the advancement of application testing to emulate certifiable equipment and framework programming.
  • It assists us with incorporating a few actual networks into a solitary network or separate single biological networks into various logical networks.
  • In application operational efficiency, NV permits the recreation of associations between applications, administrations, dependencies, and end-clients for programming testing.
  • It assists us with conveying applications in a speedier time span, in this way supporting a quicker go-to-showcase.
  • Network virtualization helps the software testing groups to determine genuine outcomes with expected examples and clog issues in a networked climate.


Today, many digital service providers trust and commit to Network functions virtualization (NFV) because of the following reasons:

  • Uses less (and less expensive) hardware.
  • Increases flexibility and workload portability.
  • Provides the ability to spin workloads up and down with minimal effort.

The economic benefits of virtualizing network infrastructure can be significant, with the Radio Access Network (RAN) representing a vital transformation opportunity for service providers. ACG Research estimates that network operators who virtualize the entire RAN can see total cost of ownership (TCO) savings of 44%. Network virtualization software allows organizations to control which types of traffic go through the physical network.

The majority of attackers depend on the fact that when they penetrate the security edge, there are few security controls in place. Using network virtualization, organizations can more readily combat security risks by creating miniature edges within the network. Using this control, microsegmentation, sensitive data can be kept within a particular virtual network that only authorized users can access.

For example, an organization could secure VoIP data by placing it within its virtual network with restricted user access. Forrester Consulting states: “Micro-segmentation enabled by network virtualization allows for the implementation of a Zero Trust model. In contrast to past security models that assumed the danger lay outside the network, Zero Trust accepts that the network is not secure.”

Furthermore, network virtualization programming can decrease or even dispense with blackouts made by equipment disappointments and further develop calamity recuperation times. The procedure of recovering from a failure on a customary network requires numerous manual, time-consuming steps, including changing the IP address of the system and refreshing the firewall. This is all obsolete with network virtualization.

Leave a Comment