Sniffer® Portable Professional User's Guide - NetScout

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Chapter 5 The Dashboard Gauge Tab 76 Sniffer Portable Professional The Gauge tab is displayed by default when you start the Dashboard. When capturing from wireless networks, the Dashboard’s Gauge tab provides a Throughput gauge. This gauge provides a real-time measurement of the data rate (in bits per second) observed by Sniffer Portable Professional. When calculating throughput, Sniffer Portable Professional only counts data frames. Management and control frames are not part of this calculation. However, the throughput measurement does include the header portions of data frames (see How Wireless Utilization is Calculated on page 76 for details). How Wireless Utilization is Calculated The Dashboard provides network utilization percentage measurements on both the Gauge and Detail tabs. Sniffer Portable Professional calculates network utilization by storing the airtime (in microseconds) for each observed frame in a buffer. Every second, the value in this buffer is divided by 1,000,000 microseconds (that is, a second) to obtain a percentage utilization measurement. The airtime for each frame is calculated as follows: 1 First, the duration of the frame’s PLCP header is stored. PLCP headers can be either: 192 microseconds. This is the Long header format specified in IEEE 802.11b/g for 1 and 2 Mbps transmission speeds. 96 microseconds. This is the Short header format specified in IEEE 802.11b/g for 5.5 and 11 Mbps transmission speeds. NOTE: The calculations for 802.11a are performed similarly except that they use the duration of the PLCP header specified for different 802.11a rates. 2 Each frame’s PLCP header includes a field indicating the length of the data portion of the frame in microseconds. Sniffer Portable Professional adds this value to the duration of the PLCP header observed in the previous step and stores the sum in a buffer. 3 Each second, the value in the buffer is divided by 1,000,000 microseconds to obtain a percentage utilization measurement.
The Dashboard 802.11 Tab 802.11 Dashboard Tab Monitoring Your Network The Dashboard’s 802.11 tab (Figure 5-4) includes counters for wireless LAN Statistics, Management frame types, and Control frame types: Statistics Counters in the 802.11 Tab on page 77 Management Frame Type Counters in the 802.11 Tab on page 79 Control Frame Type Counters in the 802.11 Tab on page 81 Figure 5-4. Sample 802.11 Tab in Dashboard Statistics Counters in the 802.11 Tab Table 5-2 lists and describes the Statistics counters in the Dashboard’s 802.11 tab (sample shown in Figure 5-4). Table 5-2. Statistics Counters in the Dashboard’s 802.11 Tab (1 of 3) Counter Description Data Pkts The number of data packets observed on the wireless LAN. User’s Guide 77
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Sniffer ® Portable Professional Us
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Related Information Resources NetSc
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5 Monitoring Your Network . . . . .
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10 Sniffer Portable Professional
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Chapter 1 Product Comparison Table
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Chapter 1 Major Components of Sniff
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Chapter 1 Table 1-2. Features for W
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Chapter 2 System Requirements 18 Sn
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Chapter 2 20 Sniffer Portable Profe
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Chapter 2 Installing the Sniffer Po
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Page 34 and 35: Chapter 2 Starting Sniffer Portable
Page 36 and 37: Chapter 2 Tuning Settings for Sniff
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Page 122 and 123: Chapter 6 Capture Controls 122 Snif
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Chapter 6 Tips: 126 Sniffer Portabl
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Chapter 6 Capturing from Specific S
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Chapter 7 Setting Expert Options 13
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Chapter 7 Expert Subnet Mask Settin
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Chapter 7 Discovered access points
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Chapter 7 Expert Oracle Options 150
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Chapter 7 Limitations of the Expert
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Chapter 7 Click to show the packet
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Chapter 8 Displaying Captured Packe
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Chapter 8 Searching for Frames in t
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Chapter 8 Searching for Data Patter
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Chapter 8 Printing Decoded Packets
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Chapter 8 Using Protocol Forcing Yo
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Chapter 9 4 Click OK. 214 Sniffer P
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Chapter 10 Specify one or more netw
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Chapter 10 5 Click OK. 246 Sniffer
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Chapter 11 Description 250 Sniffer
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Chapter 11 Entering Names Manually
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Chapter 12 Type of node triggering
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Chapter 12 Setting Alarm Severity L
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Chapter 12 Setting Alarm Notificati
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Chapter 13 Creating Sniffer Monitor
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Capture panel, 123 Capture triggers
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zooming, Host Table 111 display tab
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Resolve name on Network address, Re
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Sniffer® Portable Professional User's Guide - NetScout

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