The Dell OS10 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.

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.

Review the router configuration to verify that access control lists (ACLs) are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols.

These filters should be applied inbound or outbound on the appropriate external and internal interfaces.

Review the ACL configuration with the "show ip access-lists in" and "show ip access-lists out" commands.

OS10# show ip access-lists in Ingress IP access-list FILTER_EXTERNAL_INGRESS Active on interfaces : ethernet1/1/4 seq 10 deny ip 10.0.0.0/8 any log seq 20 deny tcp any any eq 23 seq 30 permit ip any any

If the router is not configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies, this is a finding.

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.

Step 1: Configure named ACL with appropriate filter rules.

OS10(config)# ip access-list FILTER_EXTERNAL_INGRESS OS10(config-ipv4-acl)# deny ip 10.0.0.0/8 any log OS10(config-ipv4-acl)# deny tcp any any eq 23 OS10(config-ipv4-acl)# permit ip any any OS10(config-ipv4-acl)# exit

Step 2: Apply the ACLs on the appropriate external and internal interfaces.

OS10(config-ipv4-acl)# interface ethernet1/1/4 OS10(conf-if-eth1/1/4)# ip access-group FILTER_EXTERNAL_INGRESS in