[2008.9] Wifi very unreliable
Matthias Apitz
guru at unixarea.de
Thu Oct 2 19:41:13 CEST 2008
El día Thursday, October 02, 2008 a las 04:39:01PM +0100, Alastair Johnson escribió:
> vale wrote:
> > add a sleep 500 to your loop ;)
I run this script for an hour or so:
root at om-gta02:~# cat wifi.sh
#!/bin/sh
cd /tmp
while true; do
rm 1M
wget http://www.unixarea.de/1M
date ; echo -n "now sleeping 300 sec ... "
sleep 300
echo awaked
done
and there has been no problem all this time; as well ifconfig does not
show any error packets:
root at om-gta02:~# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:12:CF:8E:FC:5F
inet addr:192.168.2.100 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::212:cfff:fe8e:fc5f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:302728 errors:0 dropped:0 overruns:0 frame:0
TX packets:131532 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:454345265 (433.2 MiB) TX bytes:10145574 (9.6 MiB)
and if you compare the RX/TX values with those from the last post:
RX packets:285483 errors:0 dropped:0 overruns:0 frame:0
TX packets:121870 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:431367301 (411.3 MiB) TX bytes:9439240 (9.0 MiB)
you see that moving from office to my home, i.e. from one AP to another,
I did not rebooted; I just ifdow / ifup with my script the eth0
interface;
> >
> > which image / kernel are you using?
>
> You should perhaps ask what AP he's using, or whether he has the power
> management enabled on the wifi. Some APs apparently get upset by power
> managed devices, and the Freerunner enables power management of the wifi
> by default to preserve battery. My wrt54g certainly gets upset from time
> to time if I connect with the freerunner, sometimes refusing to talk to
> _anything_ over wifi afterwards until rebooted.
my AP at home is a SMCWBR14-G2 EU one; regardless of the FR already in
the past sometime this get stuck and needs a power-cycle; not during the
test today;
the actual iwconfig values are:
# iwconfig eth0
eth0 AR6000 802.11g ESSID:"tarara"
Mode:Managed Frequency:2.442 GHz Access Point: 00:13:F7:0D:08:48
Bit Rate=54 Mb/s Tx-Power=15 dBm Sensitivity=0/3
Retry:on
Encryption key:XXXXXXXXXXXXX Security mode:open
Power Management:off
Link Quality:207/94 Signal level:-144 dBm Noise level:-96 dBm
Rx invalid nwid:0 Rx invalid crypt:1487 Rx invalid frag:0
Tx excessive retries:55 Invalid misc:0 Missed beacon:64
HIH
matthias
--
Matthias Apitz
Manager Technical Support - OCLC GmbH
Gruenwalder Weg 28g - 82041 Oberhaching - Germany
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e <matthias.apitz at oclc.org> - w http://www.oclc.org/ http://www.UnixArea.de/
b http://gurucubano.blogspot.com/
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