How to implement server protection by placing it in a demilitarized zone (DMZ)?

To protect a server in the DMZ (demilitarized zone), the following measures are usually applied:

• Network isolation: The DMZ is separated from the internal network and the internet using two or more firewalls. One filters traffic between the internet and the DMZ, and the other between the DMZ and the internal network.
• Minimization of services: Only necessary public services are run on the server in the DMZ to reduce the attack surface.
• Strict firewall rules: Only necessary inbound and outbound traffic is allowed, for example, only HTTP/HTTPS for a web server.
• Monitoring and logging: Continuous monitoring of activity and logging are maintained for quick detection of suspicious actions.
• Updates and patches: The server is regularly updated to fix vulnerabilities.

Example architecture:

Internet <-> Firewall 1 <-> DMZ (server) <-> Firewall 2 <-> Internal network

This approach limits access to internal resources and reduces the risk of compromising the entire network through the server in the DMZ.