Re: Linksys WUSB11 V 2.8; can't compile at76c503a sources

On Fri, 2004-01-23 at 15:54, Joerg Albert wrote:
> HI Ian,
> 
> On Fri, 23 Jan 2004, Ian B. Jacobs wrote:
> 
> > > Please check if both sides use the same preamble (short or long),
> >
> > I do not believe the BEFW11P1 (with my current firmware)
> > supports preamble settings. I can find nothing through
> > google or in my router's documentation.
> 
> OK, then switch the preamble in the WUSB11:
> long preamble (default): iwpriv wlan0 short_preamble 0
> short preamble:	iwpriv wlan0 short_preamble 1
> 
> With a short preamble in the driver and if the AP does not announce using
> "short preamble", you may get no connection to the router. After
> 	iwpriv wlan0 set_debug 0x180003
> 
> you should see an error like
> 
> "wlan0: 0xxxxxx does not support short preamble"

> in the syslog.

That is correct. The short preamble is not supported. 

> > When I set the WUSB11 to tx of 2M:
> >
> >       iwconfig wlan0 rate 2M
> >
> > I get MUCH better behavior. For instance: 2% packet loss after
> > a ping of 40 packets.
> >
> > At a rate of 5.5M, I still have problems.
> > ...
> > Thank you for your advice. Do you think that my
> > problems at higher transfer rates are due to (1) router?
> > (2) WUSB11 driver? (3) environment? (4) kernel (2.4.22-1)?
> > (5) other factors?
> 
> Difficult to say from a distance and without a trace of the channel, e.g.
> by a Prism2/3 device. Couldn't you trace the connection with your WPC11,
> which is, AFAIK, a Prism2 device? Put it into monitor mode on a fixed
> channel and use a decent ethereal version to capture the traffic.
> I could send you the commands for the wlan-ng config tool.

Yes, please send me commands. 

> What's your usual  throughput with the WPC11?

I don't know. I have just downloaded netperf but don't know
how to use it (in particular since it looks like I have to
have a netperf server running on a remote machine).

Thanks again for your patience. 

 _ Ian

-- 
Ian Jacobs ([email protected])   http://www.w3.org/People/Jacobs
Tel:                     +1 718 260-9447

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