The Juniper PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-254006 | JUEX-RT-000340 | SV-254006r844051_rule | Medium |
| Description |
|---|
| DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS) attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance, which denies access to the services that normally traverse the network or circuit. Volumetric attacks have become relatively easy to launch using readily available tools such as Low Orbit Ion Cannon or botnets. Measures to mitigate the effects of a successful volumetric attack must be taken to ensure that sufficient capacity is available for mission-critical traffic. Managing capacity may include, for example, establishing selected network usage priorities or quotas and enforcing them using rate limiting, QoS, or other resource reservation control methods. These measures may also mitigate the effects of sudden decreases in network capacity that are the result of accidental or intentional physical damage to telecommunications facilities (such as cable cuts or weather-related outages). |
| STIG | Date |
|---|---|
| Juniper EX Series Switches Router Security Technical Implementation Guide | 2023-03-23 |
Details
| Check Text ( C-57458r844049_chk ) |
|---|
| Review the router configuration and interview the System Administrator to verify that a mechanism for traffic prioritization and bandwidth reservation exists. For example: [edit class-of-service] classifiers { dscp forwarding-class NC { loss-priority low code-points 110000; } forwarding-class EF { loss-priority high code-points [ 101101 101111 100101 100111 110011 ]; loss-priority low code-points [ 101000 100000 101001 101011 100001 100011 110001 ]; } forwarding-class AF41 { loss-priority high code-points [ 100010 100100 100110 ]; loss-priority low code-points [ 011000 101110 011100 011110 ]; } forwarding-class AF31 { loss-priority high code-points [ 011101 011111 011010 010101 010111 010010 001101 001010 010000 ]; loss-priority low code-points [ 001001 001011 010001 010011 011001 011011 ]; } forwarding-class BE { loss-priority high code-points 000000; } forwarding-class Default { loss-priority high code-points 001000; } forwarding-class dscp15 { loss-priority high code-points 001111; } } } Note: Some platforms apply DSCP values to both IPv4 and IPv6 traffic with a single classifier definition (as shown). Those platforms that support separating classifiers will require a "dscp-ipv6" stanza. host-outbound-traffic { forwarding-class NC; dscp-code-point 110000; } shared-buffer { ingress { percent 50; buffer-partition lossless { percent 5; } buffer-partition lossless-headroom { percent 0; } buffer-partition lossy { percent 95; } } egress { percent 100; buffer-partition lossless { percent 50; } buffer-partition lossy { percent 45; } buffer-partition multicast { percent 5; } } } Note: Some platforms only support shared-buffer percent, and cannot separate between ingress and egress. Not all devices require a shared-buffer stanza. forwarding-classes { class NC queue-num 7; class EF queue-num 6; class AF41 queue-num 5; class AF31 queue-num 4; class BE queue-num 0; class Default queue-num 1; class dscp15 queue-num 6; } traffic-control-profiles { scheduler-map shaping-rate percent 100; } scheduler-map guaranteed-rate percent 20; } } forwarding-class-sets { class NC; class EF; class AF41; class AF31; class Default; class dscp15; } class BE; } } interfaces { forwarding-class-set { output-traffic-control-profile } output-traffic-control-profile } } classifiers { dscp } rewrite-rules { dscp } } } rewrite-rules { dscp forwarding-class dscp15 { loss-priority high code-point 101101; } forwarding-class EF { loss-priority low code-point 110001; } forwarding-class AF41 { loss-priority high code-point 100110; } forwarding-class NC { loss-priority low code-point 110000; } forwarding-class AF31 { loss-priority high code-point 010000; } forwarding-class Default { loss-priority high code-point 001000; } } } Note: Some platforms require rewriting all DSCP values if rewriting one (smaller platforms). Most support only rewriting a single DSCP value, which would eliminate all but one rewrite rule. scheduler-maps { forwarding-class NC scheduler NC; forwarding-class EF scheduler EF; forwarding-class AF41 scheduler AF41; forwarding-class AF31 scheduler AF31; forwarding-class Default scheduler Default; } forwarding-class BE scheduler BE; } } schedulers { NC { buffer-size percent 5; priority strict-high; } EF { shaping-rate percent 20; buffer-size percent 19; priority strict-high; } AF41 { shaping-rate percent 15; buffer-size percent 14; priority strict-high; } AF31 { shaping-rate percent 31; buffer-size percent 29; priority strict-high; } BE { transmit-rate percent 20; buffer-size percent 20; priority low; } Default { shaping-rate percent 10; buffer-size percent 9; priority strict-high; } } This arrangement must ensure that sufficient capacity is available for mission-critical traffic and enforce the traffic priorities specified by the Combatant Commands/Services/Agencies. If no such scheme exists or it is not configured, this is a finding. |
| Fix Text (F-57409r844050_fix) |
|---|
| Implement a mechanism for traffic prioritization and bandwidth reservation. This mechanism must enforce the traffic priorities specified by the Combatant Commands/Services/Agencies. set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp set class-of-service classifiers dscp Note: Some platforms apply DSCP values to both IPv4 and IPv6 traffic with a single classifier definition (as shown). Those platforms that support separating classifiers will require a "dscp-ipv6" stanza. set class-of-service host-outbound-traffic forwarding-class NC set class-of-service host-outbound-traffic dscp-code-point 110000 set class-of-service shared-buffer ingress percent 50 set class-of-service shared-buffer ingress buffer-partition lossless percent 5 set class-of-service shared-buffer ingress buffer-partition lossless-headroom percent 0 set class-of-service shared-buffer ingress buffer-partition lossy percent 95 set class-of-service shared-buffer egress percent 100 set class-of-service shared-buffer egress buffer-partition lossless percent 50 set class-of-service shared-buffer egress buffer-partition lossy percent 45 set class-of-service shared-buffer egress buffer-partition multicast percent 5 Note: Some platforms only support shared-buffer percent, and cannot separate between ingress and egress. Not all devices require a shared-buffer stanza. set class-of-service forwarding-classes class NC queue-num 7 set class-of-service forwarding-classes class EF queue-num 6 set class-of-service forwarding-classes class AF41 queue-num 5 set class-of-service forwarding-classes class AF31 queue-num 4 set class-of-service forwarding-classes class BE queue-num 0 set class-of-service forwarding-classes class Default queue-num 1 set class-of-service forwarding-classes class dscp15 queue-num 6 set class-of-service traffic-control-profiles set class-of-service traffic-control-profiles set class-of-service traffic-control-profiles set class-of-service traffic-control-profiles set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service forwarding-class-sets set class-of-service interfaces set class-of-service interfaces set class-of-service interfaces set class-of-service interfaces set class-of-service rewrite-rules dscp set class-of-service rewrite-rules dscp set class-of-service rewrite-rules dscp set class-of-service rewrite-rules dscp set class-of-service rewrite-rules dscp set class-of-service rewrite-rules dscp set class-of-service scheduler-maps set class-of-service scheduler-maps set class-of-service scheduler-maps set class-of-service scheduler-maps set class-of-service scheduler-maps set class-of-service scheduler-maps set class-of-service schedulers NC buffer-size percent 5 set class-of-service schedulers NC priority strict-high set class-of-service schedulers EF shaping-rate percent 20 set class-of-service schedulers EF buffer-size percent 19 set class-of-service schedulers EF priority strict-high set class-of-service schedulers AF41 shaping-rate percent 15 set class-of-service schedulers AF41 buffer-size percent 14 set class-of-service schedulers AF41 priority strict-high set class-of-service schedulers AF31 shaping-rate percent 31 set class-of-service schedulers AF31 buffer-size percent 29 set class-of-service schedulers AF31 priority strict-high set class-of-service schedulers BE transmit-rate percent 20 set class-of-service schedulers BE buffer-size percent 20 set class-of-service schedulers BE priority low set class-of-service schedulers Default shaping-rate percent 10 set class-of-service schedulers Default buffer-size percent 9 set class-of-service schedulers Default priority strict-high |