From Perimeter L3 Switch Security Technical Implementation Guide
Part of Traffic from the managed network will leak
Associated with IA controls: ECSC-1
If the gateway router is not a dedicated device for the OOBM network, several safeguards must be implemented for containment of management and production traffic boundaries such as using interface ACLs or filters at the boundaries between the two networks.
Examine the egress filter on the OOBM interface of the gateway router to verify that only traffic sourced from the management address space is allowed to transit the OOBM backbone. In the example configurations below, the 10.1.1.0/24 is the management network address space at the enclave or managed network and 10.2.2.0/24 is the management network address space at the NOC.
Configure the OOBM gateway router interface ACLs to ensure traffic from the managed network does not leak into the management network.
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