Problem with frequences

Jim Carter jimc at math.ucla.edu
Wed Apr 9 08:57:13 EST 2003


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)



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