What is the purpose of a dual firewall DMZ?

The purpose of a dual firewall DMZ (Demilitarized Zone) is to create a secure zone using two firewalls. This configuration enhances the security posture of a network by providing an additional layer of protection between the internal network and external threats.

In a dual firewall setup, the first firewall typically acts as a barrier between the external internet and the DMZ, while the second firewall is positioned between the DMZ and the internal network. This layered approach helps mitigate risks that could arise from exposing any services in the DMZ, such as web servers or email servers, to the internet. If a threat manages to infiltrate the DMZ, the second firewall provides an additional layer that can prevent unauthorized access to the internal network.

This design is crucial for organizations that need to provide services to external users while maintaining the integrity and security of their internal systems. It creates a controlled environment where external access is possible without compromising the core internal resources of the organization.