CISC-RT-000010 - The Cisco router must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies - ip access-group


Information flow control regulates where information is allowed to travel within a network and between interconnected networks. The flow of all network traffic must be monitored and controlled so it does not introduce any unacceptable risk to the network infrastructure or data. Information flow control policies and enforcement mechanisms are commonly employed by organizations to control the flow of information between designated sources and destinations (e.g., networks, individuals, and devices) within information systems.

Enforcement occurs, for example, in boundary protection devices (e.g., gateways, routers, guards, encrypted tunnels, and firewalls) that employ rule sets or establish configuration settings that restrict information system services, provide a packet filtering capability based on header information, or provide a message filtering capability based on message content (e.g., implementing key word searches or using document characteristics).


This requirement is not applicable for the DODIN Backbone.

Configure ACLs to allow or deny traffic for specific source and destination addresses as well as ports and protocols between various subnets as required. The commands used below were used to create the configuration as shown in the check content.

RP/0/0/CPU0:R2(config)#ipv4 access-list FILTER_SERVER_TRAFFIC
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq lpd
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq 631
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq 9100
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq 1433
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq 1434
RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any eq 4022
RP/0/0/CPU0:R2(config-ipv4-acl)#permit icmp any any
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ospf any any
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any any
RP/0/0/CPU0:R2(config)#int g0/0/0/0
RP/0/0/CPU0:R2(config-if)#ipv4 access-group FILTER_SERVER_TRAFFIC

Supportive Information

The following resource is also helpful.

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Cisco.