Always Validate, Always!

Always, always, always, always validate what you’re doing.

Now, there’s a lot of different ways you can go through validation. You could do an AP on a stick. When you do an AP on a stick, you actually put in AP up on a tripod.


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Always, always, always, always validate what you’re doing

Now, there’s a lot of different ways you can go through validation

You could do an AP on a stick

When you do an AP on a stick,

you actually put in AP up on a tripod

Now, you can do this before you design as a technique to

measure RF attenuation in the walls,

to measure how if the maps you were given match

You can do an AP on a stick

after you design to validate the design

You’re not validating the install, you’re validating

Does the design still meet my requirements?

Now, I like to do validations post install

now in the post install valuation range,

there’s two big categories, active and passive

You always have to have a passive

In fact, Ekahau makes it so you can’t do an active

without having a passive

Passive the most important passive means I’m listening to

everyone, neighbors, mine, my SSIDs somebody else’s

I want all the information I can gather together

Compared with an active, an active is when you have your

client device associate to an AP and you’re either pinging or

sending iperf data,

Realize the active survey data you receive

is going to be extremely flawed,

because I think every time you’re near an AP and you walk away,

the signal strength is weaker and weaker and weaker

Your pinging times get higher and higher as you walk away,

and then all of a sudden you’re right here

and you’re next to the next AP

Soon as you associate it to its amazingly fast

And so you get with active surveys is this degradation as you walk

away from one AP a little break and then really fast

as you’re associated to the next AP,

If you did an active survey clockwise,

you should look at the data, you would see it skewed

There would be a tail going away from every access point

in an active survey away

When you went toward an AP,

you’re not going to have any active data

because you were on the previous AP

Now, there’s nothing wrong with active data

It just doesn’t tell you what you think it tells you

You think the active survey is going to say you’re a user here will

receive this totally false

You’re walking some weird path that normal people don’t do,

you’re collecting data from APs, you might skip three APs

because you roamed over them

Just realize active survey data suspect

And every time you roam, you’ll get a drop

And so if you’re plotting out ping times,

you will get drops every time you roam

That does not mean that this location is a bad Wi-Fi

you might have fantastic Wi-Fi there

It just happens to be where you did that little wrong

Stop and go versus continuous

I love continuous

I hate stop and go

Stop and goes for losers

Stop goes for people who don’t mind throwing away their data

because when you collect data with a continuous

every time you walk click when I start, click when I stop,

click when you turn

Very simple rules, it’s all you have to need to know

and you go everywhere

All the data in between every one of those clicks

is being collected

You flip into a stop and go mode

You click, you wait takes longer time

You then

And when you’re done with the stop that go part is you’re walking

and you know what happens is you’re walking

You’re throwing all the data away, you’re collecting data

The data is actually being collected right then and you decided,

since I can’t walk in a straight line and I don’t know how to

click when I start, when I stop, when I turn,

I’m going to willingly throw all that data away

All you have to do is see this is look at your data set

and you will see that stopping and goes use continuous,

no continuous mode

We have other choices we can go autopilot, we can do GPS,

we can just walk and click

You can use the iPhone, an iPad

There’s all sorts of ways you can get around these

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