Problem with frequences

[Mathew G Brown]

Jim is right , 

Im assuming you are using an AP with Infrastructure clients. If this is
the case then ..

Your ESSID will determine the network the radio becomes part of.
Infrastructure mode is not channel dependant. IE: Setting the channel
option on Orinoco radios does not over ride the ESSID. This does allow
you to change the channel of your AP and all the client radios will
follow it on the new config. 

If you are running Ad-Hoc config ( and I hope not with 14 station ) then
you might want to take a read of the IEEE papers on Ad-Hoc , Each
station will attempt to connect directly to its peer that it needs to
transfer data to ( generalized statement ). The problem is that if you
loose a station at certain location you fragment the network topology
and you can get segments of the network splitting. In general they come
back.

Best Regards

Mathew G Brown 




-----Original Message-----
From: wireless-bounces+wireless=brh.co.nz at lists.samba.org
[mailto:wireless-bounces+wireless=brh.co.nz at lists.samba.org] On Behalf
Of Jim Carter
Sent: Wednesday, April 09, 2003 10:57 AM
To: Gustavo Junior Alves
Cc: wireless at lists.samba.org
Subject: Re: Problem with frequences


On Sat, 5 Apr 2003, Gustavo Junior Alves wrote:
> I have 14 sites linked by orinoco cards running on linux. Some times, 
> whe some machine is rebooted, all network is "splited" by 2 or 3 
> networks. An example:

I get the impression that you set different frequencies on different
machines.  If machine "A" boots first and elects itself the master of
channel 1, then machine "B", set to channel 6, may decide it's the
master of channel 6 (which machine "A" will ignore), or that instead
it's a slave on channel 1, after which "A" and "B" can talk to each
other.  I don't know why you sometimes get one behavior and sometimes
the other, but it probably has to do with the precise timing of beacon
transmissions from machine "A" versus listening by "B".

If the idea is for all the machines to talk together, you have to set
the same frequency on each one.  The first machine to boot will become
the master, and the others will all cooperate with it.  If it crashes,
the survivors will elect a new master.

(Reminder: with 802.11b, use channels 1, 6 and 11, since the signal
splatters over a range of 5 channels centered on the one you set.)

James F. Carter          Voice 310 825 2897    FAX 310 206 6673
UCLA-Mathnet;  6115 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA
90095-1555
Email: jimc at math.ucla.edu  http://www.math.ucla.edu/~jimc (q.v. for PGP
key)