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The perimeter router must be configured to deny network traffic by default and allow network traffic by exception.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-207132SRG-NET-000202-RTR-000001SV-207132r1137935_ruleCCI-001109high
Description
A deny-all, permit-by-exception network communications traffic policy ensures only connections that are essential and approved are allowed. This requirement applies to both inbound and outbound network communications traffic. All inbound and outbound traffic must be denied by default. Firewalls and perimeter routers should only allow traffic through that is explicitly permitted. The initial defense for the internal network is to block any traffic at the perimeter attempting to make a connection to a host residing on the internal network. In addition, allowing unknown or undesirable outbound traffic by the firewall or router will establish a state that will permit the return of this undesirable traffic inbound. This requirement also applies to Zero Trust initiatives.
STIGDate
Router Security Requirements Guide2025-09-10

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (6) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-4Information Flow Enforcement
1.00
SC-24Fail in Known State
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.13.6
1.00
CCI1 mapping
CCI-001109
1.00

Details

Check Text (C-207132r1137935_chk)

This requirement is not applicable for the DODIN Backbone. Review the router configuration to verify that the access control list (ACL) or filter is configured to allow specific ports and protocols and deny all other traffic. The filter must be configured inbound on all external interfaces. If the ACL or filter is not configured to allow specific ports and protocols and deny all other traffic, this is a finding. If the filter is not configured inbound on all external interfaces, this is a finding.

Fix Text (F-7393r1137934_fix)

This requirement is not applicable for the DODIN Backbone. Configure the perimeter router to deny network traffic by default and allow network traffic by exception.