The Cisco perimeter router must be configured to enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.
An XCCDF Rule
Description
Information flow control regulates authorized information to travel within a network and between interconnected networks. Controlling the flow of network traffic is critical so it does not introduce any unacceptable risk to the network infrastructure or data. An example of a flow control restriction is blocking outside traffic claiming to be from within the organization. For most routers, internal information flow control is a product of system design.
- ID
- SV-216753r531087_rule
- Version
- CISC-RT-000250
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
This requirement is not applicable for the DODIN Backbone.
Step 1: Configure an ACL to allow or deny traffic as shown in the example below.
RP/0/0/CPU0:R3(config)#ipv4 access-list EXTERNAL_ACL_INBOUND
RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp host x.11.1.1 eq bgp host x.11.1.2