Re: Changes from OpenAP
From: Scott Wiles (coachcartman_at_yahoo.com)
Date: 2002-01-26 05:45:54 UTC
We did some tests meshing Cisco AP's. One AP is in
'root' mode, the others are 'slaved' to it.
We compared performance with a station connected
directly to a root mode AP versus a station connected
to a slaved AP, which communicated to the root AP,
which bridged to the wireline network.
Throughput for the station degraded about 50% when
connecting via the slave AP when compared to the root
AP. As only one radio can 'talk' at a time in
infrastructure mode, the slave AP would have to stop
listening to the station and transmit the data to root
We went with bridge radios in a point to point
configuration to connect to our distant AP's. We used
different SSID's and frequencies, and connected the
remote AP to the remote bridge via 10 Base T.
This allowed the AP to use all the time-slices talking
to clients, and the bridge to do its thing.
Obviously, there are additional costs in radios and
frequencies, but performance was significantly better.
- Keith Heinemann <khmann_at_performance-data.com>
> > If someone has any ideas or comments about AP-AP
> links, they would be
> > welcome. My current driver uses kind of pseudo
> ad-hoc mode (i.e., no
> > ToDS or FromDS flags (and only 3 addresses) in
> frames between
> > APs). OpenAP uses four addresses, but in a way
> that is not compatible
> > with 802.11 standards.
> so AP-AP communication is possible with HostAP as it
> stands? Is it possible
> then to bridge wireless between two APs without an
> ethernet? Ie: have a HostAP
> use wireless for it's backbone connection? (sorry
> if this has been asked a
> billion times already :)
> if the above wireless-wireless bridging isn't
> availble, would it be possible to
> simulate it via proxy arp, ethernet frame grabber,
> masquerading, redirection?
> ...STA roaming is not critical in my application. I
> don't like the idea of
> proprietary 802.11 mesh either, but the idea of a
> single $250 USR2450 (or some
> other embedded system) providing AP and repeater
> functions (or just being an AP
> and a client of another AP at the same time) ...for
> our wireless co-op this is
> very appealing.
> many thanks for all your great work on this project!
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