Hiring Hacks: How Squarespace Actively Engages and Sources Engineers
Life Hacks for Wi-Fi Engineers - cwnp.com · PDF fileLife Hacks for Wi-Fi Engineers Jussi...
Transcript of Life Hacks for Wi-Fi Engineers - cwnp.com · PDF fileLife Hacks for Wi-Fi Engineers Jussi...
![Page 1: Life Hacks for Wi-Fi Engineers - cwnp.com · PDF fileLife Hacks for Wi-Fi Engineers Jussi Kiviniemi ... Hack #7: We actually like ... Aerohive: @WiFi_Princess (Abby Strong), @MatthewSGast](https://reader033.fdocuments.net/reader033/viewer/2022051720/5a7682c97f8b9a63638d51a2/html5/thumbnails/1.jpg)
IT Professional Wi-Fi Trek 2015
#wifitrek
Life Hacks forWi-Fi Engineers
Jussi KiviniemiVice President
linkedin.com/in/jussostwitter.com/jussikiviniemi
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Agenda
Ekahau product overview
Ekahau product demo
Ekahau awesomeness
Competitor bashing
No time for your questions. Just buy Ekahau stuff.
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Agenda
Wi-Fi Hacks
Site survey – details & best practices
Ask anything
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About the Presenter
Jussi
Janitor at Ekahau
Twitter: @jussikiviniemi
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Ekahau at CWNP
Who else is here?
Mikko - PLM
Hannele – Marketing
Keith & Devin – Trainers
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#wifitrek
Join the Ekahau Lounge
#ESSRequest post-it note board
Tell us what ESS 10.0 should be like
Winner will get his feature request
implemented
Actual lounge interior may vary
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#wifitrek
What is Ekahau anyway?
RTLSLocation Tracking Systems
Wi-Fi DesignTools for Wi-Fi Engineers
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“Who will acquire Ekahau?”
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#wifitrek
Looking at RTLS company
acquisitions…
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#wifitrek
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#wifitrek
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#wifitrek
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Hack #1: Cut the repetition
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Draw these 4000 walls!
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#wifitrek
Draw the walls of a hospital
A complete hospital has, say, 6,500 wall segments Ground floor: 2000 segments
Patient floor: 500 segments each
At two seconds per wall segment 13,000 seconds
3,6 hours
It’s time you asked for those CAD drawings Walls simplified and imported automatically
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#wifitrek
Survey these 2600 rooms.
Three times!
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#wifitrek
Perform all the site surveys in one go
Passive Use multiple adapters to speed up walking
Active At least for 5GHz band (more utilized in production)
Spectrum Preferably both bands simultaneously
2.4GHz more prone to interference
5GHz more utilized in production
Throughput Optional
Use with caution if simultaneously with spectrum
Will affect the results
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#wifitrek
Generate these 385 reports
(that are almost similar)
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#wifitrek
Reporting Wi-Fi Designs is a pain
After producing 300 almost similar reports to
different customers, you’ll agree
Do what these guys have done: Get fully
customized reports with a single click
The drawback: No easy way out
a) Build your own scripts / macros
b) Use Wi-Fi Design Tools that support it
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#wifitrek
Hack #2: Understand site surveys
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#wifitrek
Survey Phase Question
Predictive site surveys
(network plan, simulation)
Pre-Deployment site surveys
(AP on a stick)
Post-Deployment site surveys
(validation)
Periodic site surveys
(health check)
“How many APs? Where?
Power? Channels? Antennas”?
“What does the real world RF look like”
“Does this network actually work?”
“Does it still work? What has changed?”
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#wifitrek
On-Site Survey Measurements
• Passive
• Active
• Throughput
• Spectrum
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#wifitrek
Passive Site Surveys
• Most common. Used for most heatmaps.
• NIC Disassociated
• Scan through all channels
• Discover APs and their settings• MAC, channel, payload (data rates, channel widths, etc)
• Each MAC (SSID) is it’s own entity. Combining them as a radio / AP not in standard
• Read signal strength and noise level for each AP
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#wifitrek
Under the hood: Passive Site Survey
Goal: Measure signal strength, SNR, MAC, AP info
1. Send broadcast probe
2. Listen for beacons and probe responses for 105ms
3. Report the results to survey software
4. Switch to next channel
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#wifitrek
Continuous vs Stop-and-Go Survey
Continuous
Stop-and-Go
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#wifitrek
Busting the Myths: Continuous Mode
The measurements are not placed where you click The click first on the map places no measurements
Based on interpolation between two clicks
Scanning does not start when clicking on the map Scanning starts when you start the survey tool
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#wifitrek
The most common error of Continuous Surveys
Stopping for a period of time in a location…
…and not clicking when you continue walking
Sure, you remember to click when you arrive to location…
… but do you remember to click on the same location when
you leave?
Remember, the scanning is continuous, not just when you
click
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#wifitrek
Placing passive survey measurements on the
mapStop-And-Go Survey Mode
The measurements are placed exactly where you click
Scanning does not start when clicking on the map Scanning starts when you start the survey tool
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#wifitrek
Continuous vs Stop-and-Go Survey
Continuous
Stop-and-Go
scan cycle
wait time (several scan
cycles)
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#wifitrek
Stop and Go Surveys – Wait Time vs Scan Cycle
10 sec Stop-and-Go wait time
4 second scan cycle
You get 2-3 scan measurements per location
3 scans: First measurement comes in at the 1 second mark,
second at 5, third at 9
2 scans: First measurement comes in at the 3 second mark,
second at 7
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#wifitrek
Which channels to scan?
If you’re not sure, scan all of them
36 channels : around 4 seconds per scan cycle
Walk 1 meter per second – get a scan every 4 meters
Hallway speed. In rooms, it’s slower
You may want to scan more channels than your APs are on today
Understand all the neighbor networks & ACI impact & future-proofness
Limiting down channels
1,6,11 + 36-64 (UNII-1 & 2a) = 11 channels = about 1 second scan
cycle
Lose ACI info on 2.4GHz. Lose UNII-2c and 3
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#wifitrek
Using Multiple Wi-Fi Adapters for Passive
Common approach for three adapters
Adapter 1: 2.4 GHz
Adapter 2: Lower 5 GHz
Adapter 3: Upper 5 GHz
One adapter fails, your data for that area is flawed
Failover redundant approach
All adapters scanning all channels 2.4+5
If one adapter fails, you will still have valid data (just less of it)
Survey point along long hallways not as evenly distributed
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#wifitrek
Hack #3:
Choosing Your Gear Planning / reporting: 16GB RAM, 4+ cores,
max the MHz
iMac / Mac Pro, Macbook Pro
Field use: less than that has to do (8GB RAM)
Toolkit
Macbook (Air), Surface Pro (?), Dell XPS 13
Invest in what saves time
Tool standardization has its benefits
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#wifitrek
Hack #4
Some important Wi-Fi design tools Free signal meter
Spectrum analyzer
Site survey tool
Including standardized adapter!
Planning tool
On-the-spot troubleshooter
Report generator
Packet analyzer
(not for everyone, CWAP recommended)
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#wifitrek
Hack #5
Your Wi-Fi design toolkit should be:
1. Suitable.
2. Reliable.
3. Quick to use
4. Easy to learn and train.
5. Fit the budget.
The
“SRQEF “
rule of Wi-Fi tools
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#wifitrek
Hack #6
Tool Standardization
Pick and choose the best from all vendors Consider the integration points
Project file compatibility
Reporting consistency
Measurement accuracy
Training and knowledge synergies
Not just in-house, but sub-contractors
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#wifitrek
Hack #7: We actually like talking to you Aerohive: @WiFi_Princess (Abby Strong), @MatthewSGast
AirMagnet: @Advani_Dilip
Apple: @HenryStukenborg
Aruba: @SRynearson , CharlieClemmer
Cisco: @Cisco_Mobility
Ekahau: @EkaMikko, @JussiKiviniemi , @Wi-FiAndrew
Extreme: @MikeLeibovitz
Meru-Fortinet: @MeruNetworks
Metageek: @FuelCellWiFi (Joel Crane)
Ruckus: @GTHill , @GregKamer
WildPackets: @JayBotelho
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#wifitrek
Hack #8: Ask for an eval
Wi-Fi tool vendors “love” (= are forced) to
give out free evaluation versions.
Test-drive the tool carefully before
choosing.
Also, ask for a one-to-one webinar /
webmeeting to see how tool is used and
get your questions answered
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#wifitrek
Hack #9: Talk to your network users
They know what they want from
a network
They know when it doesn’t work,
before you do.
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#wifitrek
Why talk to users?
Most problems are solved in 2 minutes by asking the right questions
Wi-Fi adapter disabled Laptop hard switch
From OS settings
Wi-Fi network disconnected
Random problem that’s fixed by turning Wi-Fi on and off
Wrong security key
Connected to the incorrect Wi-Fi network
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#wifitrek
Trust your network
“If you feel confident about the network,it’s likely a client problem”
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#wifitrek
Hack #10:
Training - Tons of Free / Cheap Stuff!
Free videos & whitepapers on most vendor & CWNP websites
Many offer free, one-to-one webinar based training Free, just schedule it
Classroom training $
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#wifitrek
There’s still a ton of time…
… for questions!