Virtual Firewall: What is it?

Application and network firewall services used to filter packets on a virtual machine are called virtual firewalls. Communications between entities are managed and controlled by virtual firewalls. Networks along similar lines to those involved with a physical firewall such as switches and servers are equipped with it.

What is a Virtual Firewall?

A virtual firewall is a kind of firewall service or device that offers network traffic filtering and examining for virtual machines (VMs) in a virtualized environment.

A network firewall inspects packets for observing and supervising incoming and outgoing network traffic based on encoded security policy rules. A virtual firewall has the same job. It delivers network traffic filtering and monitoring for virtual machines (VMs) in virtualized environments.

Virtual firewalls can be moved easily from cloud to cloud. This is the reason they were preferred a lot. It may be better for smaller organizations that labor outside a company network due to the system’s flexibility. It is also simple to update and sustain.

It is a system or a network firewall device that offers packet filtering in a virtualized environment. It is responsible for managing and controlling all kinds of traffic. It works with switches and has almost the same functions as a hardware firewall; how can it help us?

A virtual firewall works in a bridge mode and a hypervisor mode. Like any ideal firewall system, a bridge mode is responsible for diagnosing and observing the virtual machine’s incoming and outgoing traffic. In hypervisor mode, the virtual firewall controls inaccessibility from the physical network, existing in the center of the hypervisor and handling both sides traffic of the virtual machine.

virtual firewall

How does it work?

A virtual firewall is an application or network firewall service that provides packet filtering within a virtualized environment. It manages and controls incoming and outgoing traffic. It works in conjunction with switches and servers similar to a physical firewall.

It prevents an unauthorized user from accessing and transmitting data and files and prevents an organization’s employees from transferring any sensitive data or documents.

It works in two modes: bridge mode and hypervisor mode. Like a traditional firewall system, bridge mode works by diagnosing and monitoring all of a VM’s incoming and outgoing traffic. In hypervisor mode, the virtual firewall operates in isolation from the physical network, residing in the core hypervisor kernel and managing the incoming and outgoing traffic of the virtual machine.

The benefits of using a virtual firewall

Organizations use virtual firewalls in the cloud to protect their cloud infrastructure and services. Any organization can run it on virtual servers and use it to protect the traffic relating to applications in the cloud. By using a cloud-based virtual firewall, the following benefits of network security in the cloud can be ensured:

  • It secures all data in the same way as the traditional hardware-based firewall.
  • It secures the physical data center by extending it to the cloud and securing the connectivity between the cloud and an organization’s local infrastructure.
  • Secures virtual data centers by managing, monitoring, and filtering all traffic.
  • Protects applications and assets in virtualized environments.
  • Using policy-based filtering tools and access control providers, virtual firewalls help to maintain the integrity and confidentiality of applications and the data stored in them or transmitted through them.
  • A notable benefit of using virtual firewalls is that they, with advanced access policy and connection management that’s provided to a company’s clients, secure remote access in all respects.
  • Whenever there are changes in network security requirements in remote branches or offices of an organization, virtual firewalls respond promptly to the changes and ensure comprehensive security.

virtual firewall

Do I need a virtual firewall?

Firewalls are a crucial component of any network security architecture but the limitation to physical ones is that they are a rigid, fixed resource that is difficult to adapt. You need to consider the capacity, visibility, and speed requirements of your current network security as well as whatever network growth might happen.

The rate at which bandwidth demand, traffic mix, and SSL/TLS adoption are growing means that a physical firewall installed today would fail to offer acceptable traffic inspection capacity well before the average three-year upgrade cycle. Virtualizing your on-premise network firewall allows you to enjoy the same features as physical firewalls, but with added flexibility to scale, meaning you don’t need a crystal ball to foresee your future security needs.

As the IT market adopts cloud-based operations, there has already been a big increase in firewall virtualization, which is only forecast to continue growing. Relying on physical firewalls involves expensive hardware upgrades and inconvenient downtime while changes are made to the network security infrastructure.


With the evolution of humanity, technologies have also evolved, and we must understand the importance of such techniques that are invented for our benefit and use them, just like virtual firewalls that were developed to help and protect our systems, so we should use them for our benefit.


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