Title

The RUCKUS ICX 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. (Cat II impact)

Discussion

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).

Check Content

Review configuration to determine whether DDoS attack prevention is configured (values may vary): ICX#show running-config | include burst ip icmp attack-rate burst-normal 500 burst-max 1000 lockup 300 ip tcp burst-normal 30 burst-max 100 lockup 300 If DSCP trust is required, verify that it has been applied to the necessary interfaces. ICX# show running-config interface ethernet x/x/x interface ethernet x/x/x trust dscp If DDoS protection is not configured or DSCP trust is required but not configured, this is a finding.

Fix Text

Configure DDoS protection (values may vary): ICX(config)#ip icmp attack-rate burst-normal 500 burst-max 1000 lockup 300 ICX(config)#ip tcp burst-normal 30 burst-max 100 lockup 300 If required, apply DSCP trust to applicable interfaces: ICX(config)# interface ethernet x/x/x ICX(config-if-e1000-x/x/x)# trust dscp

Additional Identifiers

Rule ID: SV-273601r1110917_rule

Vulnerability ID: V-273601

Group Title: SRG-NET-000193-RTR-000112

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.