BRKEWN-3000

Recommendations

Info

Receiving L2 vs Receiving L1 • To help “out of range” stations, the frame also has a physical header, always sent at lowest speed (6 Mbps in 5 GHz, 1 Mbps or 6 Mbps in 2.4 GHz) PMD Header Bytes: 2 PLCP Header 2 6 6 6 2 6 2 variable 4 Frame Duration RA TA DA Seq. SA QoS Control Control PayloadFCS Bits: 4 1 12 1 6 16 Preamble Rate Reserved Length Parity Tail Service BRKEWN-3000 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Public 46
Beyond Receiving Range STA 3 • Below Interference Threshold • Above PCS Threshold • Can detect energy, but can’t read frames (physical or MAC header) • Potential for collisions with closeby stations in the cell STA 4 • Outside coverage area for that rate • Above Interference Threshold • Can see frames, but can’t read them • Increased possibility of data corruption and collisions Coverage Threshold for chosen rate 3 Sender 1 2 4 Physical Carrier Sensing Threshold Interference Threshold BRKEWN-3000 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Public 47
Page 2 and 3: Analyzing and fixing Wi-Fi issues C
Page 4 and 5: Troubleshooting Methods
Page 6 and 7: The “Shoot from the Hip” Method
Page 8 and 9: Top Down Troubleshooting This metho
Page 10 and 11: Follow the Path Tracing the path of
Page 12 and 13: WLC / AP Toolkit
Page 14 and 15: Wireshark on CA Logic 1. To use Wir
Page 16 and 17: Wireshark on CA - Example Wireless
Page 24 and 25: Packet Capture on AireOS You can Al
Page 26 and 27: Packet Dump Notes and Gotchas • T
Page 28 and 29: Using Packet Dump • Before starti
Page 30 and 31: Using Packet Dump • Start the cap
Page 32 and 33: Using Packet Dump • The captures
Page 34 and 35: Client Troubleshooting - Packet Cap
Page 36 and 37: AP in Sniffer Mode Logic AP Sniffer
Page 38 and 39: AP in Sniffer Mode Meanwhile, in yo
Page 40 and 41: AP in Sniffer Mode You can now see
Page 42 and 43: Radiotap Header All the RF side of
Page 44 and 45: Where Should You Capture From Anywa
Page 48 and 49: What to Verify • Connection: asso
Page 50 and 51: Individual Client Throughput Test
Page 52 and 53: Load Test - Impact of Different Cli
Page 54 and 55: Cell Shape and Roaming Path • Rem
Page 56 and 57: Wireshark Survival Guide Direct Cap
Page 58 and 59: Wireshark Survival Guide Frame Sect
Page 60 and 61: Wireshark Survival Guide Sorting Fr
Page 62 and 63: Wireshark Survival Guide Sorting Fr
Page 64 and 65: Wireshark Survival Guide Filtering
Page 66 and 67: Wireshark Survival Guide Filtering
Page 68 and 69: Using Wireshark IO Graphs • You c
Page 70 and 71: What Frame to Select • You are ca
Page 72 and 73: Exporting Frames BRKEWN-3000 © 201
Page 74 and 75: Excel vs Wireshark • Large amount
Page 76 and 77: Example 1 - Select and Export 7925
Page 78 and 79: Example 1 - Same Operation on Iphon
Page 80 and 81: Example 1 - At The End of the Cell
Page 82 and 83: Example 1 - Iphone Is Not The Only
Page 84 and 85: Example 2 - Use Probe as Happiness
Page 86 and 87: Example 2 - Use Probe as Happiness
Page 88 and 89: Example 3 -Iphone 6 Performances
Page 90 and 91: Example 3 - One Way Audio with Ipho
Page 96 and 97:
802.11v: Send your BYOD to the Next
Page 98 and 99:
Evaluating Fast Lane Performances:
Page 100 and 101:
Example 4 - IOS 8 Random MAC addres
Page 102 and 103:
Random MAC Behavior • Apple intro
Page 104 and 105:
Example 4 - IOS 8 Random MAC addres
Page 106 and 107:
Real Time Signal: how does it work?
Page 108 and 109:
Example - Now It Is Your Turn • F
Page 110 and 111:
Example - Now It Is Your Turn • W
Page 112 and 113:
Demo files are at: https://www.drop
Page 114 and 115:
Complete Your Online Session Evalua
Page 116:
Thank you
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BRKEWN-3000

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