The required dual homed DISN Core or NIPRNet access circuits DO NOT follow geographically diverse paths from the CER(s) along the entire route to the geographically diverse SDNs.

From Voice Video Services Policy STIG

Part of Deficient Design: Dual Homed ckts; Diverse Paths

Associated with IA controls: ECSC-1, DCBP-1

SV-21744r1_rule The required dual homed DISN Core or NIPRNet access circuits DO NOT follow geographically diverse paths from the CER(s) along the entire route to the geographically diverse SDNs.

Vulnerability discussion

In previous requirements we discussed the need for redundant DISN Core access circuits between the enclave and the DISN SDNs. Another method for providing the greatest reliability and availability for DISN services is to provide redundancy in the network pathways between the customer site and the redundant DISN SDNs. The DISN core network is designed to be highly reliable and available in support of the DoD mission, the most vulnerable part of the network is the access circuit from the enclave to the core and the path it takes from the SDN to the customer’s site. Therefore redundant access circuits should be provisioned. Physical pathways for communications network access circuits are vulnerable to physical disruption from a variety of threats, both natural and man made. These threats range from storm damage (falling trees, floods, to being damaged or dug up by “the big yellow fiber-finder” (backhoe); to rampaging vehicles attacking utility poles; to malicious acts including war and terrorism. To overcome the physical threat, the redundant circuits should follow geographically diverse paths.

Check content

Inspect the documentation for the pathways taken by the access circuits to determine compliance with the requirement. Obtain the pathway documentation for the facilities on-site. Additionally, obtain information the DISN core PMO and/or local carrier of the access circuits for the pathways off-site. Once obtained the IAO should maintain a copy for future inspections. Changes to the pathways must also be recorded and maintained. This is a finding in the event the required dual-homed circuits follow the same path or are close enough anywhere along their entire length to be damaged by a single event.

Fix text

Ensure dual homed DISN Core or NIPRNet access circuits follow geographically diverse paths from the CER(s) along the entire route to the geographically diverse SDNs. Ensure each circuit uses different facilities such as cables, demarks, and digital cross connects in geographically diverse locations. Ensure geographic and facilities is maintained on-site and off-site. Ensure the paths taken by the access circuits remain significantly separate along their entire length such that a single point of failure is not created.

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