Microsegmentation creates small, specific security zones in a network, limiting access to resources and enhancing security.
Microsegmentation is a security strategy that involves dividing a network into small, distinct segments to improve security. Each segment or workload is isolated from the others, creating increasingly granular secure zones in data centers and cloud deployments that can be secured individually.
By isolating workloads and applications, microsegmentation can reduce the potential attack surface and limit the impact of security breaches. With microsegmentation, administrators can also manage security policies that limit traffic based on the principle of least privilege and zero trust. Additionally, microsegmentation can provide greater visibility into network traffic and enable better control over network traffic flow.
Workloads are an essential aspect of microsegmentation as they are the units of computation or processing that run on a network. Workloads can be applications, services, or processes that need to communicate with each other to function properly. Microsegmentation provides granular security control at the workload level, allowing organizations to isolate and protect specific workloads from potential threats. By segmenting workloads, an organization can limit the potential attack surface, prevent lateral movement of threats, and enforce security policies on a per-workload basis.
Perimeter or network security and microsegmentation are two different security strategies that address separate aspects of network security. Perimeter security provides a first line of defense against external threats by protecting the outer perimeter of a network—typically at the network edge—by limiting access to the network from outside sources. It inspects “north-south” (client to server) traffic that attempts to cross the security perimeter and stops malicious traffic. Perimeter security is usually achieved through technologies such as firewalls, intrusion detection and prevention systems, and VPNs.
Microsegmentation focuses on the internal security of a network by dividing it into smaller segments or zones and applying granular security controls to each segment. This allows organizations to control “east-west” lateral traffic within the network and at the application or workload level to reduce the potential attack surface.
Microsegmentation can present challenges for network performance and security if it is not properly planned and implemented.
Organizations should carefully plan their microsegmentation strategy, including the number and size of segments, the security policies to be applied, and the impact on network traffic patterns. Proper testing and monitoring should be conducted to ensure that microsegmentation does not negatively impact network performance or introduce security gaps.
Microsegmentation enables organizations to create secure zones or segments within their networks, providing granular control over network traffic and minimizing the attack surface. Each segment is then secured using policies and controls that allow only authorized traffic to flow between segments.
Microsegmentation is typically implemented using software-defined networking (SDN), which enables the creation of virtual networks that are independent of physical network infrastructure. Each of the network segments is secured using policies that define the types of traffic that are allowed to flow in and out of the segment. For example, access control lists (ACLs) can be used to control which users or devices are allowed to access each segment. Intrusion detection and prevention systems (IDPS) can be used to detect and block malicious activity within each segment. Encryption can be used to protect data as it moves between segments.
Microsegmentation provides granular visibility and control over network traffic, making it easier to identify unauthorized traffic and potential security breaches and respond quickly to security incidents.
There are three primary types of microsegmentation controls.
Agent-based microsegmentation controls use software agents installed on endpoints, such as servers, workstations, or other network devices, to enforce network segmentation policies. The agent continuously monitors and enforces the policies specific to that endpoint, and can be managed centrally through a management console, simplifying configuration and deployment policies across an organization's network.
Network-based microsegmentation controls use SDN to create virtual network segments, each with its own set of security policies and controls. These virtual segments are isolated from each other, which limits the potential for lateral movement by attackers. Policies and controls are enforced at the network layer, rather than at the endpoint level. This makes it possible to segment network traffic based on a wide range of factors, including user identity, application type, and network location.
Native cloud microsegmentation controls are specifically designed for cloud environments. They use cloud-native security features, such as network security groups and virtual private clouds to create virtual network segments and enforce security policies. These controls leverage the native security features of the cloud platform to provide granular security policies that are automatically enforced across all cloud instances.
Organizations may choose to implement one or more types of microsegmentation depending on their specific needs and goals. Common types of microsegmentation include the following.
Application segmentation protects individual applications by creating security policies that control access to specific application resources, such as databases, APIs, and web servers, helping to prevent unauthorized access and data breaches. It also allows organizations to enforce least privilege access controls, ensuring that users and applications have access only to the resources they need to perform their specific functions.
Tier segmentation secures different tiers or layers of an application stack, such as the web tier, application tier, and database tier to prevent attackers from moving laterally within the application stack and accessing sensitive data or resources.
Securing different environments or zones within a network, such as development, testing, and production environments, allows organizations to enforce strict access controls to these environments and ensure that sensitive data and resources are only accessible to authorized users and applications.
Container segmentation secures individual containers or groups of containers within a containerized environment, reducing the attack surface and helping prevent attackers from moving laterally within the container environment. Without proper segmentation containers can potentially access each other's data and configuration files, which can result in security vulnerabilities.
Container Segmentation Best Practices
User Segmentation in Cloud Security
Microsegmentation offers numerous benefits to organizations, including:
Q: How is network segmentation different from microsegmentation?
A: Network segmentation and microsegmentation both improve network security and performance, but they are fundamentally different. Traditional network segmentation (sometimes called macro-segmentation) involves dividing a network into larger segments based on function or location. It typically focuses on traffic traveling “north-south” (client to server) in and out of the network.
Microsegmentation divides a network into smaller segments and applies unique security policies to them, providing a more granular level of control over east-west network access, with the ability to enforce zero-trust access controls. Microsegmentation applies security policies at the individual workload or application level, rather than at the network level.
Q: What is an application dependency?
A: Application dependency refers to the relationships and interactions between different applications and services within a networked environment. Understanding application dependencies is important for effective microsegmentation strategies, as access changes to one application or service can impact the performance or security of other applications and services. Application dependencies should be mapped before implementing microsegmentation.
Q: What are firewall policies?
A: Firewall policies are rules that define how an organization’s firewalls allow or deny traffic between different segments of a network or between a network and the Internet. Firewall policies are the rules that determine how traffic is allowed or denied between these segments and layers.
Q: How are firewalls different from microsegmentation?
A: Firewalls control access to a network by filtering traffic based on predefined rules. While firewalls can be used to control access between segments, microsegmentation divides a network into smaller segments and applies unique security policies to each segment. This provides a more granular level of control over network access, allowing organizations to limit access to specific applications and services.
Q: What is a virtual network?
A: A virtual network operates within a physical network infrastructure but uses software to connect computers, VMs, and servers or virtual servers over a secured network. This is in distinction to the traditional physical network model where hardware and cables connect network systems. Virtual networks can be used to create isolated environments within a larger network, allowing organizations to microsegment specific applications or services.
Microsegmentation can help organizations better protect their applications and data in their networks from potential threats, as it limits the attack surface available to an attacker. In addition, microsegmentation can provide greater visibility and control over network traffic, making it easier to identify and respond to security incidents.
F5 offers products and services that can help organizations implement and manage microsegmentation and other security controls in their networks. Learn how F5 delivers simple and secure connectivity across public and hybrid clouds, data centers, and edge sites. Explore how F5 provides app layer secure networking and automated cloud network provisioning for enhanced operational efficiency