Hi,
I was quite happy when my wlan was running on suse 11.2 without a problem for over two weeks but I didn’t say touchwood :X and **** it, recently it started showing strange behaviors.
I see my wlan connected (shows active) but the internet is too slow and ping to google.com would timeout sometimes (Sendmsg: No Buffer Space Available) but if I bring my laptop closer to the router, the speed would be very good and ping times would drastically reduce. I don’t understand because I keep my laptop at the same place all this while for over two years but it only started happening recently.
I was thinking may be its something to do with router but I could connect with windows with my laptop at the same place and even further from the router and the ping times would still be very low.
Nothing has changed.
I don’t know why this unexpected behavior now with suse
I would also like to mention that I am a new user of linux. I don’t want to go back to windows for these small inconsistencies. I am sure there is some way but I don’t know yet.
I’ve seen a case at home where a neighbour installed a new router, and their router’s wireless transmission channel was close to the channel of our router. That then caused us a problem until we could change our channel. A colleague at work also had the same problem with their home router (and same solution).
@oldcpu maybe it was that problem. but its seems it was temporary. I will study its symptoms next time if it occurs again.
Thanks again to all who helpped.
internet speed is back to normal at my normal place.
Then that will be it. Had to find out the hard way at a customer’s. When I was there during daytime, no issues at all, in the evenings it was horrible. Then I found out the neighbours caused it, being on the same channel, switching their wifi router on only when being at home for energy saving reasons…
For future reference, you should do the following command:
sudo /usr/sbin/iwlist scan
Save the output. If/when you have the network problems, rerun that command to
see what changed. As caf4926 said, you likely have some interfering source nearby.
One other consideration: The spacing of the channels is 5 MHz, but each channel
has a 20 MHz width, thus adjoining channels will interfere. In fact, the only
channels that do not interfere are 1, 6, and 11. Sometimes, some ignorant person
will setup on channel 3, for example. When doing so, they actually manage to
pollute channels 1 AND 6.
Hi,
one thing I am convinced that it has to be interfering source nearby. I have been sourcing output of the command you gave me and using sdiff to find out what is causing it. I haven’t find any conclusive results yet. sometimes even when some wireless are running at the same frequency/channel as mine, the wlan is fast.
but maybe I should just schedule it through cron and check output across a time range.
one time I found that the resource was busy error but then after 5 seconds it was gone. shown below.
linux-9ikl:/home/humayun/wlants # iwlist scan > scan281020101226am_slow
lo Interface doesn’t support scanning.
eth0 Interface doesn’t support scanning.
wmaster0 Interface doesn’t support scanning.
wlan0 Interface doesn’t support scanning : Device or resource busy
Is there any particular thing that I should be looking for.
one more thing, sorry for my saying this, but is it a bug in linux?
On 10/28/2010 12:06 PM, hmanzer wrote:
>
> Hi,
> one thing I am convinced that it has to be interfering source nearby. I
> have been sourcing output of the command you gave me and using sdiff to
> find out what is causing it. I haven’t find any conclusive results yet.
> sometimes even when some wireless are running at the same
> frequency/channel as mine, the wlan is fast.
It could be some other source of 2.4 GHz interference. Some microwaves
interfere, as do some wireless phones. Not cell phones, but the handsets that
connect to a base.
> but maybe I should just schedule it through cron and check output
> across a time range.
> one time I found that the resource was busy error but then after 5
> seconds it was gone. shown below.
>
>
> linux-9ikl:/home/humayun/wlants # iwlist scan > scan281020101226am_slow
>
> lo Interface doesn’t support scanning.
>
>
> eth0 Interface doesn’t support scanning.
>
> wmaster0 Interface doesn’t support scanning.
>
> WLAN0 INTERFACE DOESN’T SUPPORT SCANNING : DEVICE OR RESOURCE BUSY
> Is there any particular thing that I should be looking for.
That happened because NetworkManager was scanning at that time, which is why the
resource was busy.
> one more thing, sorry for my saying this, but is it a bug in linux?
Not likely. These kinds of things are usually due to local conditions.
If possible, try changing the channel to another of the clear ones that I
mentioned earlier.
Hi lwfinger,
I am already on channel 11 and most of the other wireless are also either on 1,6 or 11. I don’t have much information on changing channels and how to do it. (please pardon me)
I would like to show some “fast” and “slow” outputs. when its fast my wireless comes in cell 01 but when its slow it comes as cell 03
The name of my wireless is bukitaman.
The cell number is just the order in which the AP is found. The fact that it is
1st when the network is fast and 3rd when slow argues for interference.
Unfortunately, I cannot tell anything about your network from the scan data for
your AP alone. Please post the entire output (all cells) for the fast and slow
cases.
@lwfinger
The output was too large if I combined slow and fast outputs, so I couldn’t post it. I don’t know how can I upload text files to the post.
The post option of URL is present.
Open up the large output in a text editor and copy it, and then paste it on a pastebin site such as Pastebin.com - paste tool, and press ‘submit’ on that site. It will give you a URL/web-address where the output is located. You can post that URL here.
