AB330 (External Session) You Can’t Fix It If You Can’t See ... · •Protocol Analysis...

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@ArubaNetworks | #ATM18 @eightotwo You Can’t Fix It If You Can’t See It Wireless Protocol and Spectrum Analysis Robert Bartz

Transcript of AB330 (External Session) You Can’t Fix It If You Can’t See ... · •Protocol Analysis...

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YouCan’tFixItIfYouCan’tSeeItWirelessProtocolandSpectrumAnalysis

RobertBartz

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Presenter- RobertBartz

• Eight-O-TwoTechnologySolutions,DenverColorado• Engineer,Consultant,Educator,TechnicalAuthor,CWNE• BSDegree,IndustrialTechnology,CaliforniaStateUniversityLongBeach,College

ofEngineering• FormerAerospaceTestEngineer• 25YearsTechnicalTrainingWiththeLast17YearsSpecializinginWireless

Networking• Author- CWTSOfficialStudyGuidebySybex– 1st and2nd Editions• Author- MobileComputingDeploymentandManagement:RealWorldSkillsfor

CompTIAMobility+CertificationandBeyondbySybex• Author- CWTS,CWS,andCWTCompleteStudyGuidebySybex• E-mail:[email protected] Twitter: @eightotwo

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Agenda• CommonTroubleshootingMethodology• TheOSIModel(AQuickReview)• OSIModel– TheWirelessElement• TheIEEE802.11Frame• CommonIEEE802.11FrameExchanges• WirelessLANTroubleshootingToolsforLayer2(DataLink)• ProtocolAnalysis• WirelessLANTroubleshootingToolsforLayer1(Physical)• SpectrumAnalysis

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Thisisanolollygaggingsessionlol·ly·gagˈlälēˌɡaɡ/verbNorthAmericaninformalgerundorpresentparticiple:lollygaggingspendtimeaimlessly;idle."hesendshertoArizonaeveryJanuarytolollygaginthesun"

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CommonTroubleshootingMethodologyStepsinacommontroubleshootingmethodology

1. Identifytheproblem2. Determinethescaleoftheproblem3. Possiblecauses4. Isolatetheproblem5. Resolutionorescalation6. Correctiveaction/verifysolution7. Document,documentand

document

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YouCan'tFixItIfYouCan'tSeeIt

TheOSIModel

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• Thebasicconceptofcommunicationsinthecomputernetworkenvironment

• Consistsofsevenlayers• Eachlayerismadeupofmanyprotocols

andservesaspecificfunction• Dataisencapsulatedatsomelayers• WLANtechnologyoperatesatthetwo

lowestlayers

TheOSIModel(AQuickReview)OpenSystemsInterconnection(OSI)

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Layer2– DataLinkLayer(MAC)TwosublayersResponsiblefororganizingthebit-leveldataforcommunications(frames)DetectingandcorrectingPhysicallayererrors

Layer1– PhysicalLayer(PHY)TwoSublayersBit-leveldatastreamsandcomputernetworkhardwareconnectingthedevicestogether

OSIModel– TheWirelessElementMSDU

MPDU

PPDU

The Media Access Control Service Data Unit (MSDU) is upper layer data that is encapsulated at the MAC and PLCP sublayers

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YouCan'tFixItIfYouCan'tSeeIt

TheIEEE802.11Frame

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“SHOWMETHEMONEY”

TomCruiseasJerryMaguireinJerryMaguire(1996)

FamousQuotation#1

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“SHOWMETHEDATA”RobertBartzashimselfArubaAtmosphere#atm18LasVegas,Nevada(2018)

FamousQuotation#2

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TheIEEE802.11Frame

PacketsandFrames• Packetsareatlayer3

• Packetsencapsulatedata

• FramesareatLayer2• Framesencapsulatepackets

Packet

Frame

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TheIEEE802.11Frame

IEEE802.11- GeneralFrameFormat

ImageprovidedbyIEEEStd802.11™-2016

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TheIEEE802.11FrameFrameControlField

ImageprovidedbyIEEEStd802.11™-2016

EveryIEEE802.11FrameHasaFrameControlField

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TheIEEE802.11Frame

TheThreeIEEE802.11FrameTypes• ManagementFrames• ControlFrames• DataFrames

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TheIEEE802.11FrameManagementFrameTypesinIEEE802.11Networking• CommonManagementFrames

• Beacon• PassiveScanning

• ProbeRequest/Response• ActiveScanning

• IEEE802.11Authentication• OpenSystem

• IEEE802.11AssociationRequest/Response• Capabilities

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TheIEEE802.11FrameControlFrameTypesinIEEE802.11Networking• CommonControlFrames

• RTS– RequesttoSend• Reservesthemedium

• CTS– CleartoSend• ResponsetoanRTS

• IEEE802.11ACK• Acknowledgesunicastframes

• PSPoll• Legacypowersavemode

ImageprovidedbyIEEEStd802.11™-2016

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TheIEEE802.11Frame

DataFrameTypesinIEEE802.11Networking• TwoTypesofDataFrames

• Data• NullData

ImageprovidedbyIEEEStd802.11™-2016

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TheIEEE802.11Frame

DataFramesTypesinIEEE802.11Networking• Data

• Carrydatapayload

ImageprovidedbyIEEEStd802.11™-2016

Data (MSDU) is in the frame body

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TheIEEE802.11FrameDataFramesTypesinIEEE802.11Networking• NullData

• Doesnotcarrydatapayload• Powermanagement• Channelscanning• Maintaininganassociation

Power Management Bit

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YouCan'tFixItIfYouCan'tSeeIt

CommonIEEE802.11FrameExchanges

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IEEE802.11FrameTypes

CommonIEEE802.11FrameExchanges• IEEE802.11AuthenticationandAssociation• IEEE802.11Pre-SharedKeyAuthentication• IEEE802.1X/EAPAuthentication

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IEEE802.11FrameTypes

IEEE802.11 AuthenticationandAssociation

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IEEE802.11FrameTypes

IEEE802.11Pre-SharedKeyAuthentication

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IEEE802.11FrameTypes

IEEE802.1X/EAPAuthentication

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WirelessLANTroubleshootingTools

CommonLayer2DataLinkaka(MACLayer)TroubleshootingTools

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Layer2DatalinkLayer(MAC)- TroubleshootingTools

Protocol(Packet)Analyzers• Wireshark• SavviusOmnipeek• NetscoutWi-FiAnalyzer• TamosoftCommViewforWi-Fi• MetaGeekEyeP.A.

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Layer2DatalinkLayer(MAC)- TroubleshootingTools

ThroughputTestTools• Tamosoft- Free• jPerf- Free• iPerf- Free

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Layer2DatalinkLayer(MAC)- TroubleshootingTools

Throughputtesttoolsarenotjustforthroughputtesting• Getdatamovingforvarioustestingpurposes

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AdditionalSoftwareTroubleshootingTools

Wi-FiDiscoveryTools• AcrylicWiFiHome(Windows)- Free• AirGrabWiFiRadar(MacOSX)- Free• LizardSystemsWi-FiScanner(Windows)

Freeandpurchaseversion

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AdditionalSoftwareTroubleshootingTools

Wi-FiDiscoveryTools• MetaGeekInSSIDerOffice- Purchase• NetSpot(WindowsandMac)• WiFiExplorer(Mac)– Freeandpurchase

version• Xirrus(Riverbed)W-FiInspector(Windows

andMac)- Free

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HardwareTroubleshootingTools

Wi-FiTestTools• NetscoutLinkSprinter• NetscoutAirCheckG2• BerkeleyVaritronicsYellowjacket-BANG• NetscoutOptiViewXG

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YouCan'tFixItIfYouCan'tSeeIt

ProtocolAnalysis

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Troubleshooting Tools– ProtocolAnalyzers

TypesofProtocolAnalyzers• Portable(Laptop)• Infrastructure(AccessPoints)• Distributed(Sensors)

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TroubleshootingTools– ProtocolAnalyzers

NetworkAdapterandOperationModes• MonitorvsPromiscuousMode• SupportedAdapters• AdapterCapabilities

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Troubleshooting Tools– ProtocolAnalyzers

ProtocolAnalyzersPlacement• NearAccessPoint?• NearUser?• Moving?

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TroubleshootingTools– ProtocolAnalyzers

CommonProtocolAnalyzersSettings• Filters• RFChannel/Transitioning• SavetoDisk• Naming

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TroubleshootingTools– ProtocolAnalyzers

ProtocolAnalyzersPacketList• MACAddressInformation• ProtocolTypes• Timing

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TroubleshootingTools– ProtocolAnalyzers

ProtocolAnalyzersDecodes• RadiotapHeader/PacketInfo• NotLayer2Information• DerivedfromPhysicalLayerHeaderorDriver

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TroubleshootingTools– ProtocolAnalyzers

ProtocolAnalyzersGeneralInformation• ChannelInformation• Statistics

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YouCan'tFixItIfYouCan'tSeeIt

So,Let’sGetPhysical

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WirelessLANTroubleshootingTools

CommonLayer1PhysicalLayer(akaThePHY)TroubleshootingTools

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Layer1PhysicalLayer(PHY)- TroubleshootingTools

InstrumentationSpectrumAnalyzers• Tektronix• Rohde&Schwarz• RFExplorer

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Layer1PhysicalLayer(PHY)- TroubleshootingTools

Wi-FiCentricSpectrumAnalyzers• MetaGeekChanalyzer+Wi-SpyDBx• NetscoutSpectrumXT• EkahauSidekick• Notjustfortroubleshooting

– Spectrumanalyzersarealsousedwithdesign

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Layer1PhysicalLayer(PHY)- TroubleshootingTools

SiteSurvey/DesignSoftware• NetscoutSurveyPro• EkahauSiteSurvey• TamosoftTamoGraph

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YouCan'tFixItIfYouCan'tSeeIt

SpectrumAnalysis

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TroubleshootingTools– SpectrumAnalyzers

SpectrumAnalysisAllowsYouTo• “See”YourWi-Fi

– VisualizeUnboundedMedium

• ViewInterferenceTypes– BothWi-FiandNon-Wi-Fi

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TroubleshootingTools– SpectrumAnalyzers

ViewKeyInformation• SignalStrength

– Receivedsignal(-55dBm)

• RFNoiseFloor– Unwantedsignal(-95dBm)

• SignaltoNoiseRatio(SNR)– Differencebetweensignalandnoise

» -55dBm– (-95dBm)=+40dBm

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TroubleshootingTools– SpectrumAnalyzers

ViewKeyInformation• RealTimeFFT

– Amplitudeoverfrequency

• Waterfall– RFsignaloveraperiodoftime

• ChannelUtilization– RFactivityonthechannel

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TroubleshootingTools– SpectrumAnalyzers

SpectrumAnalysisAllowsYouToSee• Co-channelInterference(Wi-Fi)• OverlappingChannelInterference(Wi-Fi)• Non-Wi-FiInterference• MuchMore

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YouCan'tFixItIfYouCan'tSeeIt

SpectrumAnalyzerDemonstration

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Questions?

Whatisthebestwaytolearnprotocolanalysis?Justdoit!

Howmuchdothetoolscost?Varyfromfreetomanythousandsofdollars

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ThankYou!RobertBartzE-mail: [email protected]: @eightotwo


If You Can’t Breathe, You Can’t Function You Can't Breathe You C… · If You Can’t Breathe, You Can’t Function: Integrating Cardiopulmonary and Postural Control Strategies

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Analysis of a professional music video – “The Saturdays – Just Can’t Get Enough”

Analysis of a professional music video – “The Saturdays – Just Can’t Get Enough”

cannot can’t can’t arenot aren’t aren’t isnot isn’t.

cannot can’t can’t arenot aren’t aren’t isnot isn’t.

CAN’T NOBODY

CAN’T NOBODY

Dashboards If You Can’t Measure You Can’t Manage

Dashboards If You Can’t Measure You Can’t Manage

Aruba Networks - Startseite · 9 CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 17 @arubanetworks Aruba Networks AirWave Comprehensive Management of Mobile

Aruba Networks - Startseite · 9 CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 17 @arubanetworks Aruba Networks AirWave Comprehensive Management of Mobile

YOU CAN’T IMPROVE WHAT YOU CAN’T MEASURE.

YOU CAN’T IMPROVE WHAT YOU CAN’T MEASURE.

If you can’t measure it, you can’t manage it. - efi.com · Auto-Count ® 4D Shop Floor Production Intelligence If you can’t measure it, you can’t manage it.

If you can’t measure it, you can’t manage it. - efi.com · Auto-Count ® 4D Shop Floor Production Intelligence If you can’t measure it, you can’t manage it.

CAN’T STAY. CAN’T GO. - British Red CrossSecure Site ...CAN’T STAY. CAN’T GO. Refused asylum seekers who cannot be returned Catherine Blanchard and Sarah Joy Policy, Research

CAN’T STAY. CAN’T GO. - British Red CrossSecure Site ...CAN’T STAY. CAN’T GO. Refused asylum seekers who cannot be returned Catherine Blanchard and Sarah Joy Policy, Research

Can – can’t

Can – can’t

Virginia Woolf’s Answer to “Women Can’t Paint, Women Can’t ...

Virginia Woolf’s Answer to “Women Can’t Paint, Women Can’t ...

Why Johnny Can’t Pentest: An Analysis of Black-box Web ...vigna/publications/2010_doupe_cova_vigna... · Why Johnny Can’t Pentest: An Analysis of Black-box Web Vulnerability Scanners

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A Comparison of Ship Self Defense Analysis Simulations · A Comparison of Ship Self Defense Analysis Simulations ... what it can and can’t do for the types of analysis we ... -

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YOU CAN’T MANAGE WHAT YOU CAN’T MEASURErfidtec.co.za/backend/media/Thu17Nov2011144147/111208 RFID...YOU CAN’T MANAGE WHAT YOU CAN’T MEASURE ... associated with losing documents

YOU CAN’T MANAGE WHAT YOU CAN’T MEASURErfidtec.co.za/backend/media/Thu17Nov2011144147/111208 RFID...YOU CAN’T MANAGE WHAT YOU CAN’T MEASURE ... associated with losing documents

Technical Analysis for Long-term Investorsclayallen.com/TALTI.pdf · Technical Analysis for Long-term Investors ... says that you can’t predict stock prices with technical analysis,

Technical Analysis for Long-term Investorsclayallen.com/TALTI.pdf · Technical Analysis for Long-term Investors ... says that you can’t predict stock prices with technical analysis,

1 @arubanetworks Where are we going?. 2 Some of the forces driving WLAN (re)design Migration to IPv6 Consumer devices in the enterprise Migration to the.

1 @arubanetworks Where are we going?. 2 Some of the forces driving WLAN (re)design Migration to IPv6 Consumer devices in the enterprise Migration to the.

“ ” You can’t save it, You can’t borrow it, You can’t lend it, You can’t leave it, You can’t take it, You can only do two things with it Use It or Loose.

“ ” You can’t save it, You can’t borrow it, You can’t lend it, You can’t leave it, You can’t take it, You can only do two things with it Use It or Loose.

‘Can’t be what you can’t see’ - Notre Dame | Notre …...‘Can’t be what you can’t see’: The transition of Aboriginal and Torres Strait Islander students into higher

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