D-Link DWS-1008 Product Manual - Page 407
Enabling Rogue and Countermeasures Notifications, IDS and DoS Alerts, Flood Attacks, DoS Attacks
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Enabling Rogue and Countermeasures Notifications By default, all SNMP notifications (informs or traps) are disabled. To enable or disable notifications for rogue detection, Intrusion Detection System (IDS), and Denial of Service (DoS) protection, configure a notification profile that sends all the notification types for these features. IDS and DoS Alerts MSS can detect illegitimate network access attempts and attempts to disrupt network service. In response, MSS generates messages and SNMP notifications. The following sections describe the types of attacks and security risks that MSS can detect. For examples of the log messages that MSS generates when DoS attacks or other security risks are detected, see "IDS Log Message Examples". Note: To detect DoS attacks, active scan must be enabled. Flood Attacks A flood attack is a type of Denial of Service attack. During a flood attack, a rogue wireless device attempts to overwhelm the resources of other wireless devices by continuously injecting management frames into the air. For example, a rogue client can repeatedly send association requests to try to overwhelm APs that receive the requests. The threshold for triggering a flood message is 100 frames of the same type from the same MAC address, within a one-second period. If MSS detects more than 100 of the same type of wireless frame within one second, MSS generates a log message. The message indicates the frame type, the MAC address of the sender, the listener (AP and radio), channel number, and RSSI. DoS Attacks When active scan is enabled on APs, MSS can detect the following types of DoS attacks: • RF Jamming-The goal of an RF jamming attack is to take down an entire WLAN by overwhelming the radio environment with high-power noise. A symptom of an RF jamming attack is excessive interference. If an AP radio detects excessive interference on a channel, and RF Auto-Tuning is enabled, MSS changes the radio to a different channel. • Deauthenticate frames-Spoofed deauthenticate frames form the basis for most DoS attacks, and are the basis for other types of attacks including man-in-the-middle attacks. The source MAC address is spoofed so that clients think the packet is coming from a legitimate AP. If an AP detects a packet with its own source MAC address, the AP knows that the packet was spoofed. D-Link DWS-1008 User Manual 388
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