©2015 netscout ° confidential & proprietary€¦ · ©2015 netscout ° confidential &...


When Every Second Counts!

Solving Wi-Fi Problems in Record Time

©2015 NETSCOUT ° CONFIDENTIAL & PROPRIETARY 3

The Basic Troubleshooting Process

Validatetheproblem

Isolatethefault

Diagnosetherootcause

Identifyandimplementcorrectiveaction

Validatetheproblemissolved


How It’s Done In Real Life

ProblemisreportedasaWi-Fiproblem.

Persontakingthecallasksafewbasicquestions.

TechconsultsWLANManagementSystem.

Techgoestolocationofproblem,orcallsandsendssomeone.

Tech(oraTechProxy)solvestheproblemiftheycan.Iftheycannot,theythenescalatetoaSr Techor

Engineer.

Sr TechorEngineerthen…

Isn’t it always?

99.85% of the time does not resolve it this way. Escalates to a technician.

Ok, this solves some problems. But Wi-Fi issues can be location-dependent, or not Wi-Fi at all, and the APs might not see the issue or the cause.


Can The Right Tools Really Help?

Typically tools focus and compete on test features and measurements.

Tool#1ü Signallevelü NoiseandSNRü Decodesü Channelutilizationü Retryratesü Connectivityü Pingtests

Tool#2ü Signallevelü NoiseandSNRü Decodesü Channelutilizationü Connectivityü Pingtests

Tool#3ü Signallevelü NoiseandSNRü Decodesü Channelutilizationü Retryratesü Connectivity

Tool#4ü Signallevelü NoiseandSNRü Channelutilizationü Retryratesü Connectivityü Pingtests

Results in lots of valuable measurements, and lots of overlap, but product attributes can make it difficult or time-consuming to use.


Operational Expediencies

The right product attributes can make workflow faster and easier by providing:• Faster time to results• More integrated and automated workflow• Coordinated workflow for escalations and validations• No learning curve (yes, this is operational)

Solvemostproblemswithafasterworkflow.

GeorgeStefanickofFreeSpaceWirelesswiththeAirCheck G2


Faster Time to Results

• Form factor• Boot time• User interface navigation• Data display: UI flatness vs readability• Automation

• Boot• Login• WaitforBGprocesses• Startapp• Go!>30secs

• Boot• Go!<10secs


Integrated and Automated Workflow

• Form factor• Combine tools into one• Automated upload/storage of results


Coordinated Workflow

• Immediately make results available to others: manager, project lead, contract hirer, customer

• Cover mass tests while on-site to optimize that costly time. Have results available later, automatically, no time added.

1. Connect2. Test3. Uploadresults

WithLink-Live,BeFaster!


No Learning Curve

• Learn the tool as you use it• Logical embedded links• Good balance of UI flatness vs info density • Automated testing• Automated workflow


Solving Common Problems Faster


• First View: Within 30 seconds of power-on, see common KPI’s and potential problems

• Send anyone to location to test• Add one or more networks to test

First, One-click AutoTest

You’reremote… Gettingpass/failresultsfrom… Thisguyon-site.


“The Wireless is Slow”

What to check for:• How many APs on the channel• Airtime utilization of the channel• What AP is the customer connected to, and what rates are supported• Are there legacy clients present?


Troubleshooting in the Channel Domain

Channel Utilization is one-click from Home and immediately shows:• Are there too many APs on a channel• Are there APs on overlapping channels in 2.4

GHz (2, 3, 4, 5, 7, 8, 9, 10)• Is 802.11 (Wi-Fi) airtime utilization too high?• Is Non-802.11 (non-Wi-Fi) airtime utilization

too high?



Selectachannel Verifyyourselection

Viewchanneldetails

ViewAPsonchannel


Troubleshooting in the AP Domain

TheFastpath toACause

SelectAPandCheckConfigurationSelectNetwork SelectAPs


“I Can’t Connect to the Wireless”

What to check for:• AP Signal and SNR coverage for the network• AP configuration (Security, 802.11 types and rates)• See if the AirCheck G2 can connect from the location of the client• Client configuration• Network services and connectivity: DHCP, DNS, internet• Congestion and channel overutilization• AP backhaul to the WLAN controller and the network


Troubleshooting in the Network Domain

NetworkCheckthenetworktheyaretryingtoconnectto.SeeiftheSignalandSNRaregood,andthereisatleast1APactive.

NetworkChecktheSecurityand802.11typessupported.Besuretheclientmatches.DrilltoindividualAPsifneeded.

ConnectRunaconnectiontestontheAirCheck G2toseeifitcanconnect.Ifso,aclientmis-configurationislikely.Ifnot,seewhyitfailed.

ConnectIfastepfails(red),pulldowntoseewhereandwhy.Couldbe:- Authenticationincorrect- DHCPfailuretogetaddress- DNSnotavailable


“I Keep Getting Disconnected”

What to check for:• AP configuration• Client configuration• Power mis-match between AP and Client• Interference (Non 802.11 channel utilization)• Roaming• Unauthorized devices on the network• See if the AirCheck G2 can connect from the location of the client


Troubleshooting in the Network Domain

ConnectRunaconnectiontestontheAirCheck G2toseeifitcanconnect.Ifso,aclientmis-configurationislikely.Ifnot,seewhyitfailed.

RoamingTestRunaroamingtest.VerifyifAirCheck G2canroamonthenetwork.

RoamingTestIfroamingfails,examinetheAPsformisconfigurations.AlsotryconnectingtotheAPyoubelieveshouldhavebeenroamedto.

NetworksForexample,thenetworkslistwillshowthisindicationifmixedsecuritytypesarefoundontwoormoreAPs.DrillintotheAPstoseewhichones.



TheFastpath toaCause

SelectAPSortingonSignalStrengthwillshowthelikelyAPat

thetop.

SelectChannel Channel


Troubleshooting in the Client Domain

SelectNetwork SelectAPs SelectAP CheckAPSignalLevelatClient

location

ComparewithClientSignalLevelatAPlocation


Sweeping in the Network Domain

SetupSSIDFilter

ScanNetworks IdentifyAPs LocateRogueAP


AirCheck G2 Tips

• Testing captive portal networks• Adjacent Channel Interference test

– On each channel for which an AP resides, counts APs on overlapping channels– Scans and counts all channels in 2.4GHz, but reports results for only channels selected for scanning– Best practice: set channel scan to only 1, 6, 11, to limit results reported to these channels.

• Resolving hidden networks • How to add a network to a profile without having to type in a long SSID• Screen Captures• Filters: signal level, SSID• AirCheck G2 Manager: analyzing results in a spreadsheet• Link-Live: filtering results, reply to email to add note


Profiles

• Specific settings and configurations are saved to Profiles– Networks and credentials, thresholds, filters, etc.– Does not include Device Settings

• Test different scenarios at different sites– Create a profile for each site you test– Create profiles with different thresholds for testing different services: VoFi, web/email,

guest vs employee access, etc.• Profiles can be configured and save on the tool and on AirCheck G2 Manager.


“Remote” User InterfaceFor web conferences or projector demos from your laptop

N E T S C O U T . C O M

THANKYOU

©2015 netscout ° confidential & proprietary€¦ · ©2015 netscout ° confidential &...

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