• Requirement

    (a) Implement a managed interface for each external telecommunication service;
    (b) Establish a traffic flow policy for each managed interface;
    (c) Protect the confidentiality and integrity of the information being transmitted across each interface;
    (d) Document each exception to the traffic flow policy with a supporting mission or business need and duration of that need;
    (e) Review exceptions to the traffic flow policy [Assignment: organization-defined frequency] and remove exceptions that are no longer supported by an explicit mission or business need;
    (f) Prevent unauthorized exchange of control plane traffic with external networks;
    (g) Publish information to enable remote networks to detect unauthorized control plane traffic from internal networks; and
    (h) Filter unauthorized control plane traffic from external networks.

  • Discussion

    External telecommunications services can provide data and/or voice communications services. Examples of control plane traffic include Border Gateway Protocol (BGP) routing, Domain Name System (DNS), and management protocols. See SP 800-189 for additional information on the use of the resource public key infrastructure (RPKI) to protect BGP routes and detect unauthorized BGP announcements.

More Info

  • Title

    Boundary Protection | External Telecommunications Services
  • Family

    System and Communications Protection
  • Related NIST 800-53 ID


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