[MLB-WIRELESS] connecting

[Roger Venning]

> -----Original Message-----
> From: owner-melbwireless at wireless.org.au
> [mailto:owner-melbwireless at wireless.org.au]On Behalf Of Ryan Abbenhuys
> Sent: Thursday, 1 August 2002 9:57 PM
> To: melbwireless at wireless.org.au
> Subject: Re: [MLB-WIRELESS] connecting
>
>
> If you're not using an AP though and instead are routing between 2 other
> nodes with OSPF or similar, who are connecting to you Ad-Hoc then
> you would
> have to use a low power Omni or similar antenna.
> All those in the group who are hoping that eventually we can get a mesh
> style network going in future would of course need everyone to
> use an omni.
<snip>

I support Ryan on this. Although there is a place for directionals
(short-circuiting the topology in situations where line of sight is
available), there is still a lot of value in using one omnidirectional to
get a number of links to close by nodes and get the outdegree (or the number
of links) of your node up to a few or more. In an urban and suburban
situation, the path loss increases rapidly enough that you causing
interference to remote nodes is not really an issue I think. If it is, it
means you will be able to successfully link to a large number of nodes, and
the most appropriate thing to do then is probably to reduce your output
power.

The way to set up a network on this paradigm is to use interfaces in ad-hoc
mode, all on the same frequency, assign IP addresses from a large subnet,
and run OSPF in point-to-multipoint mode. This finds reachability to hosts
that are not directly connected (although on the same subnet) as well as of
course finding reachability to client networks associated with nodes (both
wireless and wireline). It allows intermediate nodes to route on behalf of
peers.

Read http://users.bigpond.com/r.venning/wireless.html if you want to know
more.

Roger.

--
Roger Venning  \ "Research is what I'm doing when I don't
Melbourne, Aust \  know what I'm doing." Werner von Braun.


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