Re: OT: Wireless Signal Strength

Hi Sogho,
I am using windows only, most of the clients are either windows vista or
windows 7 and the vendor is dell (desktops/laptops). I had a doubt on the
wireless driver, i checked on one or two and found that all of them have
wireless drivers older than one year. I have upgraded my laptop's wireless
driver to see if things become better. Actually executives sit on 8th Floor,
so problem is mostly noticed by them over there. I will try to reassociate
APs and let you know, By the way can i try to assign same channel to the
floors which has only two APs (1st floor and 8th floor) because right now
they are using different channels?

Regards,
Khurram
2010/12/26 Shogo Kobayashi <k.shogo_at_gmail.com>

> Hi Khurram,
>
> 1. What supplicant are you using? Windows or vendor? Try Windows if not.
> 2. If wireless driver is not the latest one, update the driver.
> 3. In order to isolate the problem, power-off the surrounding APs(including
> upper floor and lower floor one), and then associate.
> If the problem still persist, it may not be the interference
> problem...as your D-link router works fine.
> 4. If you are using Windows Vista or later, debug the wireless condition.
>
> By the way, is this problem equally happens on 8th floor as well?
>
> Best Regards,
>
> 2010/12/26 Khurram Noor <engr.khurramnoor_at_googlemail.com>
>
> HI Sogo,
>> this client has a very poor antivirus solution and no patch management
>> solution deployed..... so the possibility of malicious traffic is there.
>> There are microwaves on each floor but in a closed pantry room, and the
APs
>> are much far from them. This problem has just started to come since last
one
>> week.
>>
>> Regards,
>> Khurram
>> 2010/12/26 Shogo Kobayashi <k.shogo_at_gmail.com>
>>
>> Hi
>>>
>>> As long as RRM is properly working, the channel must be fine,,, if there
>>> is no microwave or other things like in hospital...
>>> Maybe signal is strong enough, but noise causes the slowness.
>>>
>>> Do you see any suspicious traffic going out from your client? Some of
>>> vendor software sending lots of traffic once client connected to network.
>>> And if you are using bluetooth on client, turn it off to see whether
problem
>>> solves.
>>>
>>> Best Regards,
>>>
>>> On Sun, Dec 26, 2010 at 2:18 PM, Khurram Noor <
>>> engr.khurramnoor_at_googlemail.com> wrote:
>>>
>>>> Dear all,
>>>>
>>>>
>>>>
>>>> I am having a strange problem with a client. He has around 25 access
>>>> points
>>>> installed in a 8 floor building. They are using cisco AP 1140 with 2
>>>> WLCs
>>>> 5508 for management. Things were fine in the beginning but now the
>>>> problem
>>>> is with the signal strength. The signal bars on any system before
>>>> connection
>>>> shows excellent strength, but as soon as the system gets connected, the
>>>> signal strength starts to decrease and becomes poor. this causes latency
>>>> and
>>>> timeout. Browsing becomes really slow and wireless users are suffering.
>>>>
>>>>
>>>>
>>>> Wireless Lan controller runs an algorithm called RRM, which
>>>> automatically
>>>> adjust Tx power, channel assignment and many other parameter. If there
>>>> is
>>>> someone in this group who know can tell what settings on WLC need to
>>>> change.
>>>> Could this be a result of some power issue on the catalyst 4500 switch
>>>> which
>>>> is a POE supported? Or is this some malware kind of thing?
>>>>
>>>>
>>>> By the way wired users have no such problem (latency, delay etc)
>>>>
>>>> --
>>>> Khurram Noor
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
>>>> _______________________________________________________________________
>>>> Subscription information may be found at:
>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
>>> $p*L 39'^ Shogo KOBAYASHI
>>> k.shogo_at_gmail.com (e-mail)
>>>
>>
>>
>>
>> --
>> Khurram Noor
>> CCIE # 24419
>>
>> http://www.linkedin.com/in/khurramnoor
>>
>
>
>
> --
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> $p*L 39'^ Shogo KOBAYASHI
> k.shogo_at_gmail.com (e-mail)
> skype name: shogo2022
>

--
Khurram Noor
CCIE # 24419
http://www.linkedin.com/in/khurramnoor
Blogs and organic groups at http://www.ccie.net