What is a Software-Defined Perimeter?

Isometric scheme

The traditional perimeter-based approach to network security isn’t enough. To adequately protect their data, businesses are turning to a new approach - the Software-Defined Perimeter.

What Is a Software-Defined Perimeter?

Implementing SDP allows organizations to restrict network access and provide customized, manageable and secure access to networked systems.
Connectivity is based on the need-to-know-model, meaning each device and identity must be verified before being granted access to the network.

What Does a Software-Defined Perimeter Do?

An SDP solution allows IT Managers to deploy gateways on-premise or over the cloud, securing employees’ remote access to cloud and on-premise applications, all while keeping sensitive data within the organizational network. It has been shown to stop all forms of network attacks including DDoS, Man-in-the-Middle, Server Query (OWASP10) and Advanced Persistent Threat.

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Securing a Digital Workspace

SDPs protect networks and critical assets from external threats.


With an SDP, you can implement automated policies that dictate which device, user and service is able to access the network.

Global Access

Using an SDP, you can deploy unified gateways, giving access to any resources, from any location. This provides connectivity for remote and on-premise users.

Precise Segmentation

SDPs integrate with any Identity Provider, including Active Directory and SAML services, allowing you to utilize precise segmentation.

Secured & Encrypted

To ensure total privacy, data security and classification, SDPs provide client and endpoint protection, identity and access management, OS and application level security, all while encrypting traffic with mutual TLS encryption.

How Does a Software Defined Perimeter Work?




SDP Client - Access Control

The client verifies each user’s identity and routes whitelisted applications to authorized remote applications. This real time configuration ensures the certificate-based mutual TLS VPN only connects to authorized services. Network traffic is encrypted and tunneled between the user’s device until reaching the corresponding SDP Gateway.


SDP Controller - Trust Broker

The controller establishes trust between the SDP Client and backend security controls by authenticating users and devices. By evaluating the controller, Issuing Certificate Authority and Identity Provider, the user and network entitlements are verified, the SDP Controller configures the gateway in real time to provision a mutual TLS connection.


SDP Gateway - Termination Point

The set of gateways grants access to previously private resources. This termination point for the mutual TLS connection from the Client verifies the identity of the requesting device, authorizes the user, and grants access to the requested network.

Why Enterprises Are Moving to a Software-Defined Perimeter

Transitioning to the cloud presents new vulnerabilities that can significantly impact an organization’s security.

Replace labor-intensive and inconvenient VPNs, Firewalls, and NACs.

While perimeter-based network security tools are effective at the bare minimum security standards, these tools fail to fully protect data and provide customized access for individual users. Users often have too general network access. If breached, this could give cybercriminals the ability to penetrate and move laterally across your private network.

Ensure compliance through secure, policy-based access.

Secure network segmentation that creates one-to-one network connections between the user and the resources they access. Everything else is invisible - including the system itself. This not only applies the principle of least privilege to the network, but also reduces the attack surface area by hiding network resources from unauthorized users.

Grant on-premise and remote network access.

Tedious hardware installations and hours of help desk support are now a thing of the past. With a Software-Defined Perimeter architecture and comprehensive management platform, gateways can be automatically deployed in any location, enabling simplified network security and IT management.

Discover How SDP Technology
Can Transform Your Business

With Perimeter 81, our mission is to provide secure,
private and unrestricted Internet access to
businesses of all sizes and industries.

Our Software-Defined Perimeter architecture offers:

  • Complete visibility
  • Precise segmentation
  • A highly scalable solution
  • A user-centric experience
  • Simple transition to cloud environments

Secure employees' access to cloud resources with our single-click service.

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