D-Link DWS-1008 Product Manual - Page 451
How Remote Traffic Monitoring Works, Using Snoop Filters on Radios That Use Active Scan
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How Remote Traffic Monitoring Works To monitor wireless traffic, an AP radio compares traffic sent or received on the radio to snoop filters applied to the radio by the network administrator. When an 802.11 packet matches all conditions in a filter, the AP encapsulates the packet in a Tazmen Sniffer Protocol (TZSP) packet and sends the packet to the observer host IP addresses specified by the filter. TZSP uses UDP port 37008 for its transport. (TZSP was created by Chris Waters of Network Chemistry.) You can map up to eight snoop filters to a radio. A filter does not become active until you enable it. Filters and their mappings are persistent and remain in the configuration following a restart. However, filter state is not persistent. If the switch or the AP is restarted, the filter is disabled. To continue using the filter, you must enable it again. Using Snoop Filters on Radios That Use Active Scan When active scan is enabled in a radio profile, the radios that use the profile actively scan other channels in addition to the data channel that is currently in use. Active scan operates on enabled radios and disabled radios. In fact, using a disabled radio as a dedicated scanner provides better rogue detection because the radio can spend more time scanning on each channel. When a radio is scanning other channels, snoop filters that are active on the radio also snoop traffic on the other channels. To prevent monitoring of data from other channels, use the channel option when you configure the filter, to specify the channel on which you want to scan. All Snooped Traffic Is Sent in the Clear Traffic that matches a snoop filter is copied after it is decrypted. The decrypted (clear) version is sent to the observer. D-Link DWS-1008 User Manual 432
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