Networking

Back-to-Back Firewall DMZ Design

Network Design diagram · made in Skemio

Network diagram of a back-to-back firewall architecture showing the internet connecting through an external firewall to a DMZ switch, followed by an internal firewall protecting the corporate core.
Network diagram of a back-to-back firewall architecture showing the internet connecting through an external firewall to a DMZ switch, followed by an internal firewall protecting the corporate core.
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What it shows

  • A zero-day exploit in vendor A's firmware is stopped cold by vendor B.
  • External FW terminates untrusted traffic; internal FW protects private LAN.
  • Compromised public-facing DMZ hosts cannot pivot freely into internal DBs.

The takeaway

Vendor diversity in a dual-firewall DMZ eliminates single-point firmware vulnerabilities.

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