Detections
Analytics

ARST-RT-000300 - The 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.

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Information

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, Quality of Service (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).

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Implement a mechanism for traffic prioritization and bandwidth reservation. This mechanism must enforce the traffic priorities specified by the Combatant Commands/Services/Agencies.

Step 1: Configure the Arista router for traffic queuing based on traffic prioritization and bandwidth reservation.

router(config)#vlan 4033
 trunk group 4033
!
interface Port-Channel33
 description L3-PO33->Distro1-QFX5200-32C-100G
 routerport trunk allowed vlan 2100-2102,4033
 routerport mode trunk
 routerport trunk group 4033
 qos trust dscp
 !
 tx-queue 0
 bandwidth percent 20
 !
 tx-queue 1
 bandwidth percent 40
 shape rate 40088888
 !
 tx-queue 2
 bandwidth percent 15
 shape rate 15022222
 !
 tx-queue 3
 bandwidth percent 25
 shape rate 25250000

Step 2: Configure the Arista router differentiated services code point (DSCP) with a 6-bit field in the IP header, which marks all traffic for protocol-specific traffic with the configured DSCP value.

router(config)#qos map dscp 0 1 2 3 4 5 6 7 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 40 41 42 43 44 46 47 48 50 51 52 53 54 55 56 57 58 59 60 61 62 63 to traffic-class 0
qos map dscp 11 to traffic-class 1
qos map dscp 39 to traffic-class 2
qos map dscp 15 49 to traffic-class 3
!

Step 3: Configure the Arista router trusted routed links with the quality of service port trust mode on the Ethernet interface.

router(config)#interface Ethernet 2
description OSPF LINK TO DODIN ENCLAVE
 no routerport
 ip address 172.16.50.1/30
 ipv6 nd ra hop-limit 32
 ip access-group STIG in
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 7 OQ62NhxhqcbWEps4eZjZOg==
 ipv6 ospf encryption ipsec spi 1 esp null sha1 passphrase 7 ZauLr6BwU+Q1MGMLbbys9A==
 qos trust dscp

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_EOS_4-2x_Y23M02_STIG.zip

Item Details

References: CAT|II, CCI|CCI-001095, Rule-ID|SV-256012r882378_rule, STIG-ID|ARST-RT-000300, Vuln-ID|V-256012

Plugin: Arista

Control ID: 3c754d183b935a42d505cf5ecfde4453bca8ad96e6fcac53bd9bfd7031da7cc9