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XCCDF
Juniper EX Series Switches Router Security Technical Implementation Guide
SRG-NET-000205-RTR-000004
The Juniper perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.
The Juniper perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.
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The Juniper perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.
Medium Severity
<VulnDiscussion>Firewall filters are used to separate data traffic into that which it will route (permitted packets) and that which it will not route (denied packets). Secure configuration of routers makes use of firewall filters for restricting access to services on the router itself as well as for filtering traffic passing through the router. Inbound versus Outbound: It should be noted that some operating systems default access lists are applied to the outbound queue. The more secure solution is to apply the access list to the inbound queue for three reasons: - The router can protect itself before damage is inflicted. - The input port is still known and can be filtered upon. - It is more efficient to filter packets before routing them.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>