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  4. JUNI-RT-000240 – The Juniper perimeter router must be configured to deny network traffic by default and allow network traffic by exception.
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JUNI-RT-000240 – The Juniper perimeter router must be configured to deny network traffic by default and allow network traffic by exception.

Details

A deny-all, permit-by-exception network communications traffic policy ensures that only connections that are essential and approved are allowed.

This requirement applies to both inbound and outbound network communications traffic. All inbound and outbound traffic must be denied by default. Firewalls and perimeter routers should only allow traffic through that is explicitly permitted. The initial defense for the internal network is to block any traffic at the perimeter that is attempting to make a connection to a host residing on the internal network. In addition, allowing unknown or undesirable outbound traffic by the firewall or router will establish a state that will permit the return of this undesirable traffic inbound.

Solution

This requirement is not applicable for the DoDIN Backbone.

Configure a term at the end of the inbound filter to deny all other traffic by default as shown in the example below.

[edit firewall family inet]
set filter FILTER_INBOUND_TRAFFIC term DENY_ALL_OTHER then syslog discard

Supportive Information

The following resource is also helpful.

This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Juniper.

References

Source

Updated on July 16, 2022
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