shameless vendor presentation...types of interference co-channel every client and access point on...
TRANSCRIPT
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Shameless Vendor Presentation
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Shameless Vendor Presentation
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Look Into my Eye P.A.
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Intro
Joel Crane, CWNE Sales Engineer at Ekahau Twitter: @Potato_Fi
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Darkside of the Room
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Types of InterferenceCo-Channel
Every client and access point on the same channel
competes for time to talk.
Non-Wi-Fi
Non-802.11 devices also need time to talk.
Adjacent-Channel
Every client and access point on overlapping channels yell
over each other.
65 7
%@&#!?
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Wi-Fi is Half-DuplexOnly one Wi-Fi device can talk on a channel at a time.
Data
ACK
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Half-DuplexOnly one device can talk at a time.
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Detecting Interference
Wi-Fi Scanning ● Shows what channels
AP’s are using
Spectrum Analysis ● Shows interference
from non-802.11 devices ● Shows 802.11 channel
congestion
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Start with the Physical Layer
Use spectrum analysis (Layer 1) to identify and
remove non-Wi-Fi interference
Use packet analysis (Layer 2) to dig deeper into
802.11 congestion.
Spectrum analysis will guide you to the next troubleshooting step.
Non-Wi-Fi Signature
Wi-Fi Signature Heavy Utilization
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Questions
● Who is talking slowly? ● Who is talking the most? ● Who is repeating
themselves?
1 mbps
65 mbps
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Packet Analysis is Best for...Co-Channel Interference
Packet analysis shows the details about 802.11 congestion on a specific
channel.
Activity from laptops, tablets, smartphones,
and access points
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Airtime (Layer 2) Percentage of time that
802.11 frames reserved on the air.
Utilization (Layer 1) Percentage of time that raw RF was detected on
the air.
Utilization vs Airtime
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How I know that I’m not wrong
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Wireless Frame TypesEach frame type gets a unique color
3 Frame Types: ● Management ● Control ● Data
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Wireless Frame TypesManagement Frames: “Manage” stations joining and leaving wireless networks.
● Beacons ● Probes ● Authentication ● Association
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Wireless Frame TypesControl Frames: “Control” the RF medium and aid in the delivery of other frames.
● ACK ● Block-ACK ● RTS ● CTS
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Wireless Frame TypesData Frames: Carry higher-level protocol data.
● Data ● QoS Data ● Null Data
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Airtime Arbitration Process
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Packet Analysis with WiresharkDifficult to visualize airtime usage.
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Multi-layered Pie ChartsCharts show information in layers.
Network
Access Point
Client
Frame Type
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Frame TypesSee what is management overhead, and what is actual data.
Data Frames Data QoS Data
Management Frames Beacons Probes
Control Frames Acknowledgements Block-ACKs RTS/CTS
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Demo
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Packet Capture Sources
AirPcap Nx ● 2x2 802.11a/b/g/n ● Capture directly in
Eye P.A.
*Other Sources ● Linux ● Access Point ● OmniPeek
*Experimental support in most cases
macOS ● Airtool (duh)
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Questions?
MetaGeek Team at WLPC
● Ryan Woodings: @ryanwoodings ● Peter Vomocil: @luminouslx ● Casey Cathey: @Cathey_Fi ● Adam Miedema: @ARMiedema ● Brian Rich: @briantrich
Joel Crane @Potato_Fi