Re: Scannning

2007-03-19 Thread yelo_3


>> 1) why can't nm do the scan in the time between the user clicks and the menu 
>> is popped?
>
>Because scans take a non-trival amount of time on many cards.  You
>simply cannot block the menu being popped down for 3 or 5 seconds while
>a scan is taking place.

If you can't update the list while it is shown (as a gtk limitation) you can 
change the icon in a scaning one, so the user will understand why it waits for 
5 seconds. (5 seconds? are you sure? I have ipw2200 and the scan through iwlist 
lasts in mess than half second)
I really think that a user prefers to wait for some seconds and have a coherent 
list. What is the sense of an old list?
Tell me what you think about it

>> 2) so if I do "while echo 0; do iwlist eth1 scan; done" it is a dos, so nm 
>> should not interest on dos...
>
>Yes, but you have root and can shoot yourself in the foot with it.
>People using NM don't necessarily have root.

I don't need root to do iwlist eth1 scan

>> 3) if you really want to consider dos, you can trigger a N-secons timeout 
>> after the first scan
>
>That's the plan.  NM scans periodically, but when you drop the applet
>down, NM will do a scan.  If you click again, another scan will be
>scheduled for 10 or 20 seconds from that point.

ok it is good.









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Re: Scannning

2007-03-19 Thread Dan Williams
On Mon, 2007-03-19 at 15:58 +, yelo_3 wrote:
> > There are essentially none, except that the 'iwlist scan' obviously
> > starts a scan right away, and blocks waiting on the scan results, while
> > NetworkManager schedules scans at various points in time because it's
> > not a command-line tool that you explicitly invoke from a terminal.  But
> > the internal process is pretty much the same.
> > 
> > Dan
> 
> Ok so if there are no substantial differences:
> 1) why can't nm do the scan in the time between the user clicks and the menu 
> is popped?

Because scans take a non-trival amount of time on many cards.  You
simply cannot block the menu being popped down for 3 or 5 seconds while
a scan is taking place.

> 2) so if I do "while echo 0; do iwlist eth1 scan; done" it is a dos, so nm 
> should not interest on dos...

Yes, but you have root and can shoot yourself in the foot with it.
People using NM don't necessarily have root.

> 3) if you really want to consider dos, you can trigger a N-secons timeout 
> after the first scan

That's the plan.  NM scans periodically, but when you drop the applet
down, NM will do a scan.  If you click again, another scan will be
scheduled for 10 or 20 seconds from that point.

Dan

> 4) because the user will see results when he clicks on the applet, there is 
> no advantage at all
>in doing scans when the applet is not used (and the user is already 
> connected), unless
>you want to add a "new networks found" notify (but now there is no 
> such feature)
> 
> 
> 
> 
> 
> 
> 
>   
> 
>   
>   
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Re: Scannning

2007-03-19 Thread yelo_3
> There are essentially none, except that the 'iwlist scan' obviously
> starts a scan right away, and blocks waiting on the scan results, while
> NetworkManager schedules scans at various points in time because it's
> not a command-line tool that you explicitly invoke from a terminal.  But
> the internal process is pretty much the same.
> 
> Dan

Ok so if there are no substantial differences:
1) why can't nm do the scan in the time between the user clicks and the menu is 
popped?
2) so if I do "while echo 0; do iwlist eth1 scan; done" it is a dos, so nm 
should not interest on dos...
3) if you really want to consider dos, you can trigger a N-secons timeout after 
the first scan
4) because the user will see results when he clicks on the applet, there is no 
advantage at all
   in doing scans when the applet is not used (and the user is already 
connected), unless
   you want to add a "new networks found" notify (but now there is no such 
feature)











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Re: Scannning

2007-03-19 Thread Dan Williams
On Mon, 2007-03-19 at 14:59 +, yelo_3 wrote:
> > Right, that's a bug.  The scan shouldn't get rescheduled a further 20
> > seconds every time the menu is dropped down, it should let the 20s
> > timeout run down first.
> > Dan
> 
> In my case the scan is not done, even If I wait for the 20 seconds timeout.
> 
> Can someone tell me the differences between how nm and iwlist scan for new 
> networks?

There are essentially none, except that the 'iwlist scan' obviously
starts a scan right away, and blocks waiting on the scan results, while
NetworkManager schedules scans at various points in time because it's
not a command-line tool that you explicitly invoke from a terminal.  But
the internal process is pretty much the same.

Dan


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Re: Scannning

2007-03-19 Thread yelo_3
> Right, that's a bug.  The scan shouldn't get rescheduled a further 20
> seconds every time the menu is dropped down, it should let the 20s
> timeout run down first.
> Dan

In my case the scan is not done, even If I wait for the 20 seconds timeout.

Can someone tell me the differences between how nm and iwlist scan for new 
networks?









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Re: Scannning

2007-03-19 Thread Dan Williams
On Mon, 2007-03-19 at 10:27 -0400, Matthew Saltzman wrote:
> On Mon, 19 Mar 2007, Tambet Ingo wrote:
> > [...]
> > There are multiple problems when trying to "fix" this behavior:
> >
> > * Scanning disables all other operations on card so network doesn't work at
> > that time. That's the reason there is a timeout, that's the reason there
> > can't be a "scan now" button (well, part of the reason anyway). We need to
> > protect NM from malicious users who can write a shell script to make NM scan
> > constantly (or if they're not smart enough, keep hitting that
> > button/activating the menu manually). [1]
> > [...]
> >
> > [1] I'm not sure how serious that is since any user can just deactivate all
> > networking anyway.
> 
> The idea of preventing a user from intentionally launching a DoS attack on 
> his own service seems strange to me.  As you say, if a user wants to deny 
> himself a service, all he needs to do is turn it off.  (If NM is intended 
> to manage networks on a truely multi-user system, that's different.  But 
> that's not how I ever envisioned it.  I don't use NM on my workstations 
> because they don't need the dynamic network management facility.  I just 
> don't think of laptops as "real" multi-user systems.)
> 
> Accidental self-DoS is a different issue.  One thing that occurs to me is 
> simply not rescheduling the scan if the menu is opened within the 
> 20-second interval.  Then a user can just reopen the menu every few 
> seconds and see if it's been updated.  There's no way to really cancel a 
> scheduled scan, so what's wrong with just letting it go once scheduled?

Right, that's a bug.  The scan shouldn't get rescheduled a further 20
seconds every time the menu is dropped down, it should let the 20s
timeout run down first.

Dan


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Re: Scannning

2007-03-19 Thread Dan Williams
On Mon, 2007-03-19 at 14:48 +0200, Tambet Ingo wrote:
> Here's how scanning is scheduled:
> 
> When the nm-applet's devices menu is expanded, NetworkManager
> schedules a scan to start in 20 seconds. If the menu is deactivated
> and activated again within that 20 seconds, NM re-schedules the scan
> after another 20 seconds. So if you keep clicking on applet with
> intervals less than 20 seconds, the NM initiated scan never happens.
> When the scan is actually initiated, it takes a bit time to get the
> results back and it depends on wireless driver how fast/slow it is. If
> the menu is still expanded, the scan results are not added to the
> menu, you have to deactivate the menu and activate it again to see the
> results (and a new scan is scheduled again). 

Right, there are bugs in the scan algorithm like this one that should
get fixed, but before that we needed to determine exactly _how_ it
should best get fixed, which I think we now know.  We'd have problems if
people wanted very short scan intervals while connected, which doesn't
appear to be the case.

For 0.6.x at least, I think we can get a good enough patch.

Dan


> There are multiple problems when trying to "fix" this behavior:
> 
> * Scanning disables all other operations on card so network doesn't
> work at that time. That's the reason there is a timeout, that's the
> reason there can't be a "scan now" button (well, part of the reason
> anyway). We need to protect NM from malicious users who can write a
> shell script to make NM scan constantly (or if they're not smart
> enough, keep hitting that button/activating the menu manually). [1] 
> 
> * The devices menu is a GtkMenu widget which means the changes made to
> the menu (adding/removing menu items) while it's expanded doesn't
> change it's appearance until it's shown next time. Another
> difficulties are to keep the menu sorted correctly, replace the labels
> of devices (there's a generic and specific variants, depending on the
> number of same type devices). Nothing impossible, just requires a lot
> of work and while the SVN trunk barely works at the moment, it's
> doesn't make sense to work on that right now. 
> 
> [1] I'm not sure how serious that is since any user can just
> deactivate all networking anyway.
> 
> Tambet
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Re: Scannning

2007-03-19 Thread Dan Williams
On Mon, 2007-03-19 at 00:12 +, yelo_3 wrote:
> It is simpler: Sorry I was not clear. I was not connected, and I was moving 
> around to search for the correct AP (there is only one for students)
> 
> In this case and in the case that wireless was off, scanning is not fast 
> enough

Ok, good.  In this case, we can make NM scan more frequently quite
easily, because you're not connected to anything.  The problem with
frequent scans is really only when you're connected.  Sorry for all the
misunderstanding :)  We may still need to back that down somewhat, since
active scanning does take battery power on a laptop, and not all drivers
support passive scanning.

So now that all this is sorted out, we can do a few things:

1) scan quickly after a GUI event like app menu dropdown, right now that
doesn't happen quite as quickly as we'd all like

2) change the max scan timeout while disconnected to be somewhat lower

Dan

> - Messaggio originale -
> Da: Dan Williams <[EMAIL PROTECTED]>
> A: yelo_3 <[EMAIL PROTECTED]>
> Cc: NetworkManager-List 
> Inviato: Lunedì 19 marzo 2007, 1:04:16
> Oggetto: Re: Scannning
> 
> On Sun, 2007-03-18 at 23:45 +, yelo_3 wrote:
> > The use case is when I move around, in my university! There are different 
> > access points in different places.
> > Or simply when I decide to enable wireless and before it was disabled
> 
> Do they have the same SSID?  Doesn't NetworkManager disconnect you when
> you move out of range of one SSID?  When you're disconnected, NM should
> scan more frequently.
> 
> So is the case that you are _still_ in the coverage of SSID A, but you
> have now moved into the area SSID B (A and B overlap), but you want to
> switch off A move to B immediately when B is in range?
> 
> Dan
> 
> > - Messaggio originale -
> > Da: Dan Williams <[EMAIL PROTECTED]>
> > A: yelo_3 <[EMAIL PROTECTED]>
> > Cc: NetworkManager-List 
> > Inviato: Lunedì 19 marzo 2007, 0:40:36
> > Oggetto: Re: Scannning
> > 
> > On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
> > > > In my experience when I click the applet new networks begin showing up
> > > > within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> > > > card sometimes takes longer.
> > > 
> > > it is not always true, with my ipw2200 sometimes I have to wait around 2 
> > > minutes
> > 
> > What's the use-case here again?
> > 
> > Are you suspending, going home, and waking the laptop up and the AP is
> > not showing up in the menu?
> > 
> > Or are you turning on an access point and expecting it to show up?
> > 
> > Or are you walking from one access point coverage area to another?
> > 
> > Or?
> > 
> > Dan
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > ___ 
> > L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail: 
> > http://it.docs.yahoo.com/nowyoucan.html
> 
> 
> 
> 
> 
> 
>   
> 
>   
>   
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Re: Scannning

2007-03-19 Thread yelo_3

> Here's how scanning is scheduled:


> When the nm-applet's devices menu is expanded, NetworkManager schedules a 
> scan to start in 20 seconds. If the menu is deactivated and activated again 
> within that 20 seconds, NM re-schedules the scan after another 20 seconds.

I've tried to do so: boot with wireless off, login, wireless activation, click 
on the applet, 30 seconds of wait, another click on the applet. The result is 
empty, so there is a problem in this way...

Anyway I didn't really understand why it is scheduled and why can't be done 
immediately


> There are multiple problems when trying to "fix" this behavior:


> * Scanning disables all other operations on card so network doesn't work at 
> that time.
> We need to protect NM from malicious users who can write a shell script

All right, I didn't know it
I'm sure the user can do a script which does "iwlist eth1 scan", so this is not 
a nm problem
oh, and if I do "iwlist eth1 scan" my network does not go down...
So how is scan implemented in nm?


> * The devices menu is a GtkMenu widget which means the changes made to the 
> menu (adding/removing menu items) while it's expanded doesn't change it's 
> appearance until it's shown next time.

Isn't there a redraw function? I know that C APIs are very sad, but I hope 
there is one!














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Re: Scannning

2007-03-19 Thread Matthew Saltzman
On Mon, 19 Mar 2007, Tambet Ingo wrote:
> [...]
> There are multiple problems when trying to "fix" this behavior:
>
> * Scanning disables all other operations on card so network doesn't work at
> that time. That's the reason there is a timeout, that's the reason there
> can't be a "scan now" button (well, part of the reason anyway). We need to
> protect NM from malicious users who can write a shell script to make NM scan
> constantly (or if they're not smart enough, keep hitting that
> button/activating the menu manually). [1]
> [...]
>
> [1] I'm not sure how serious that is since any user can just deactivate all
> networking anyway.

The idea of preventing a user from intentionally launching a DoS attack on 
his own service seems strange to me.  As you say, if a user wants to deny 
himself a service, all he needs to do is turn it off.  (If NM is intended 
to manage networks on a truely multi-user system, that's different.  But 
that's not how I ever envisioned it.  I don't use NM on my workstations 
because they don't need the dynamic network management facility.  I just 
don't think of laptops as "real" multi-user systems.)

Accidental self-DoS is a different issue.  One thing that occurs to me is 
simply not rescheduling the scan if the menu is opened within the 
20-second interval.  Then a user can just reopen the menu every few 
seconds and see if it's been updated.  There's no way to really cancel a 
scheduled scan, so what's wrong with just letting it go once scheduled?

-- 
Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs
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Re: Scannning

2007-03-19 Thread Tambet Ingo

Here's how scanning is scheduled:

When the nm-applet's devices menu is expanded, NetworkManager schedules a
scan to start in 20 seconds. If the menu is deactivated and activated again
within that 20 seconds, NM re-schedules the scan after another 20 seconds.
So if you keep clicking on applet with intervals less than 20 seconds, the
NM initiated scan never happens. When the scan is actually initiated, it
takes a bit time to get the results back and it depends on wireless driver
how fast/slow it is. If the menu is still expanded, the scan results are not
added to the menu, you have to deactivate the menu and activate it again to
see the results (and a new scan is scheduled again).

There are multiple problems when trying to "fix" this behavior:

* Scanning disables all other operations on card so network doesn't work at
that time. That's the reason there is a timeout, that's the reason there
can't be a "scan now" button (well, part of the reason anyway). We need to
protect NM from malicious users who can write a shell script to make NM scan
constantly (or if they're not smart enough, keep hitting that
button/activating the menu manually). [1]

* The devices menu is a GtkMenu widget which means the changes made to the
menu (adding/removing menu items) while it's expanded doesn't change it's
appearance until it's shown next time. Another difficulties are to keep the
menu sorted correctly, replace the labels of devices (there's a generic and
specific variants, depending on the number of same type devices). Nothing
impossible, just requires a lot of work and while the SVN trunk barely works
at the moment, it's doesn't make sense to work on that right now.

[1] I'm not sure how serious that is since any user can just deactivate all
networking anyway.

Tambet
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Re: Scannning

2007-03-19 Thread yelo_3
> Does it cost  much just to set a menu (as in all Windows) that reset the 
> list of  network available and launch a scan immediately ?

The problem is different: Dan was saying that the scan is performed every time 
you click on the applet, although I don't really know if it is done! (at least 
in ubuntu feisty). Which distribution are you using?

So the new button should not be needed. But I still don't understand why in our 
case the scan lasts in 2 minutes...
What could cause this problem?









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Re: Scannning

2007-03-18 Thread Joan Moreau

Dan,

The use case, is, as many people with a laptop, to move from a location 
to another, and not willing to wait 2 minutes because the applet just 
does not scan fast enough the new networks available.

Does it cost  much just to set a menu (as in all Windows) that reset the 
list of  network available and launch a scan immediately ?

Thanks a lot, it would make  life much easier for some of us,

Joan

Dan Williams wrote:
> On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
>   
>>> In my experience when I click the applet new networks begin showing up
>>> within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
>>> card sometimes takes longer.
>>>   
>> it is not always true, with my ipw2200 sometimes I have to wait around 2 
>> minutes
>> 
>
> What's the use-case here again?
>
> Are you suspending, going home, and waking the laptop up and the AP is
> not showing up in the menu?
>
> Or are you turning on an access point and expecting it to show up?
>
> Or are you walking from one access point coverage area to another?
>
> Or?
>
> Dan
>
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Re: Scannning

2007-03-18 Thread yelo_3
It is simpler: Sorry I was not clear. I was not connected, and I was moving 
around to search for the correct AP (there is only one for students)

In this case and in the case that wireless was off, scanning is not fast enough

- Messaggio originale -
Da: Dan Williams <[EMAIL PROTECTED]>
A: yelo_3 <[EMAIL PROTECTED]>
Cc: NetworkManager-List 
Inviato: Lunedì 19 marzo 2007, 1:04:16
Oggetto: Re: Scannning

On Sun, 2007-03-18 at 23:45 +, yelo_3 wrote:
> The use case is when I move around, in my university! There are different 
> access points in different places.
> Or simply when I decide to enable wireless and before it was disabled

Do they have the same SSID?  Doesn't NetworkManager disconnect you when
you move out of range of one SSID?  When you're disconnected, NM should
scan more frequently.

So is the case that you are _still_ in the coverage of SSID A, but you
have now moved into the area SSID B (A and B overlap), but you want to
switch off A move to B immediately when B is in range?

Dan

> - Messaggio originale -
> Da: Dan Williams <[EMAIL PROTECTED]>
> A: yelo_3 <[EMAIL PROTECTED]>
> Cc: NetworkManager-List 
> Inviato: Lunedì 19 marzo 2007, 0:40:36
> Oggetto: Re: Scannning
> 
> On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
> > > In my experience when I click the applet new networks begin showing up
> > > within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> > > card sometimes takes longer.
> > 
> > it is not always true, with my ipw2200 sometimes I have to wait around 2 
> > minutes
> 
> What's the use-case here again?
> 
> Are you suspending, going home, and waking the laptop up and the AP is
> not showing up in the menu?
> 
> Or are you turning on an access point and expecting it to show up?
> 
> Or are you walking from one access point coverage area to another?
> 
> Or?
> 
> Dan
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ___ 
> L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail: 
> http://it.docs.yahoo.com/nowyoucan.html










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Re: Scannning

2007-03-18 Thread Dan Williams
On Sun, 2007-03-18 at 23:45 +, yelo_3 wrote:
> The use case is when I move around, in my university! There are different 
> access points in different places.
> Or simply when I decide to enable wireless and before it was disabled

Do they have the same SSID?  Doesn't NetworkManager disconnect you when
you move out of range of one SSID?  When you're disconnected, NM should
scan more frequently.

So is the case that you are _still_ in the coverage of SSID A, but you
have now moved into the area SSID B (A and B overlap), but you want to
switch off A move to B immediately when B is in range?

Dan

> - Messaggio originale -
> Da: Dan Williams <[EMAIL PROTECTED]>
> A: yelo_3 <[EMAIL PROTECTED]>
> Cc: NetworkManager-List 
> Inviato: Lunedì 19 marzo 2007, 0:40:36
> Oggetto: Re: Scannning
> 
> On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
> > > In my experience when I click the applet new networks begin showing up
> > > within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> > > card sometimes takes longer.
> > 
> > it is not always true, with my ipw2200 sometimes I have to wait around 2 
> > minutes
> 
> What's the use-case here again?
> 
> Are you suspending, going home, and waking the laptop up and the AP is
> not showing up in the menu?
> 
> Or are you turning on an access point and expecting it to show up?
> 
> Or are you walking from one access point coverage area to another?
> 
> Or?
> 
> Dan
> 
> 
> 
> 
> 
> 
>   
> 
>   
>   
> ___ 
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Re: Scannning

2007-03-18 Thread yelo_3
The use case is when I move around, in my university! There are different 
access points in different places.
Or simply when I decide to enable wireless and before it was disabled

- Messaggio originale -
Da: Dan Williams <[EMAIL PROTECTED]>
A: yelo_3 <[EMAIL PROTECTED]>
Cc: NetworkManager-List 
Inviato: Lunedì 19 marzo 2007, 0:40:36
Oggetto: Re: Scannning

On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
> > In my experience when I click the applet new networks begin showing up
> > within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> > card sometimes takes longer.
> 
> it is not always true, with my ipw2200 sometimes I have to wait around 2 
> minutes

What's the use-case here again?

Are you suspending, going home, and waking the laptop up and the AP is
not showing up in the menu?

Or are you turning on an access point and expecting it to show up?

Or are you walking from one access point coverage area to another?

Or?

Dan










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Re: Scannning

2007-03-18 Thread Dan Williams
On Sun, 2007-03-18 at 16:50 +, yelo_3 wrote:
> > In my experience when I click the applet new networks begin showing up
> > within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> > card sometimes takes longer.
> 
> it is not always true, with my ipw2200 sometimes I have to wait around 2 
> minutes

What's the use-case here again?

Are you suspending, going home, and waking the laptop up and the AP is
not showing up in the menu?

Or are you turning on an access point and expecting it to show up?

Or are you walking from one access point coverage area to another?

Or?

Dan

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Re: Scannning

2007-03-18 Thread Joan Moreau

Exactly.

Maybe a menu can just trigger "iwlist wlan0 scan" ?



yelo_3 wrote:
>> In my experience when I click the applet new networks begin showing up
>> within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
>> card sometimes takes longer.
>> 
>
> it is not always true, with my ipw2200 sometimes I have to wait around 2 
> minutes
>
>
>
>
>
>   
>
>   
>   
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Re: Scannning

2007-03-18 Thread yelo_3
> In my experience when I click the applet new networks begin showing up
> within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
> card sometimes takes longer.

it is not always true, with my ipw2200 sometimes I have to wait around 2 minutes









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Re: Scannning

2007-03-18 Thread Darren Albers
On 3/18/07, Joan Moreau <[EMAIL PROTECTED]> wrote:
>
> Would it be possible to add in the menu a simple action "scan new networks"
>
> It would really make life much easier...
>
> Thanks
>
> Joan
> >

When you click the menu it triggers a scan event, the scan is not
instantaneous due to various driver issues but it should start
populating local networks shortly after you click it.

In my experience when I click the applet new networks begin showing up
within 30 seconds.  This is with an IPW2200 and IPW3945, my Atheros
card sometimes takes longer.
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