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When protecting the boundaries of a network, the firewall must be placed between the private network and the perimeter router and the Demilitarized Zone (DMZ).


Finding ID Version Rule ID IA Controls Severity
V-251366 NET0351 SV-251366r853652_rule Medium
The only way to mediate the flow of traffic between the inside network, the outside connection, and the DMZ is to place the firewall into the architecture in a manner that allows the firewall the ability to screen content for all three destinations.
Network Infrastructure Policy Security Technical Implementation Guide 2023-05-04


Check Text ( C-54801r806051_chk )
Review the network topology diagrams and visually inspect the firewall location to validate correct position on the network.

If the firewall is not positioned between the perimeter router and the private network and between the perimeter router and the DMZ, this is a finding.

Exception: If the perimeter security for the enclave or B/C/P/S is provisioned via the JRSS, then this requirement is not applicable.
Fix Text (F-54754r806052_fix)
Move the firewall into the prescribed location to allow for enforcement of the Enclave Security Policy and allow for all traffic to be screened.