Local Mode with wIPS provides wIPS detection “on-channel”, which means attackers will be detected on the channel that is serving clients. For all other channels, ELM provides best effort wIPS detection. This means that every frame the radio would go “off-channel” for a short period of time. While “off-channel”, if an attack occurs while that channel is scanned, the attack will be detected.
An AP in local mode with wIPS spends only 50 ms for off-channel scanning; it will take a long time if the attacks are off-channel. This is why ELM only provides the best effort with regard to off-channels attacks. It is recommended to use monitoring mode (MM) AP to detect off-channel attacks. On the other hand, because ELM is on operating channel most of time, it detects on-channel attacks much faster than MM AP.
To get the best output, ELM AP with WSM module is the recommended solution for WIPS deployment. Threshold-based alarms tend to cause more false positives compared to non threshold-based ones. But for some of them, the accuracy of alarms can be increased when out of sequence (OOS) logic is also taken into consideration. Therefore, these alarms are subjects for administrators to monitor, review, and fine-tune.
The features of ELM are:
Adds wIPS security scanning for 7x24 on channel scanning (2.4 GHz and 5 GHz), with best effort off channel support
The access point is additionally serving clients and with the G2 Series of Access Points enables CleanAir spectrum analysis on channel (2.4 GHz and 5 GHz)
Adaptive wIPS scanning in data serving local and FlexConnect APs
Protection without requiring a separate overlay network
Supports PCI compliance for the wireless LANs
Full 802.11 and non-802.11 attack detection
Adds forensics and reporting capabilities
Flexibility to set integrated or dedicated MM APs
Pre-processing at APs minimize data backhaul (that is, works over very low bandwidth links)
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