[OLSR-users] Re: [WLANware] Selling the idea of OLSR

Aaron Kaplan (spam-protected)
Sat Jul 8 18:01:29 CEST 2006

On Sun, 2006-07-09 at 01:47 +1000, Dan Flett wrote:
> Hi guys,
> I am giving a presentation to my wireless group, Melbourne Wireless, this
> Friday on OLSR.  We currently use OSPF and a traditional routed network
> where each node has multiple radios, each with a separate /28 subnet.  Most
> of our links are point-to-point or point-to-multipoint (client-to-AP).  A
> lot of people are very sceptical of the idea of using a /16 netmask on an
> interface and of using Omni-to-Omni links.
> Here are some of the criticisms I'll need to address:
> * Mesh networks are not scalable - they cause too much CPU load on small
> routers.

true. but: gradually increase as you go. it works. In Vienna, there are
around 100 olsr devices and berlin has AFAIK 250 (?)
so... you should have some space to grow.

> * Omni antennas pick up too much RF noise for usable links

true, use more directionals in addition

> * Omni-to-Omni links have limited range and the population density in
> Melbourne is not sufficient for a critical mass to form a useful mesh
c.f. above, use more directionals

> * A network where everyone is using a /16 netmask will be like a giant LAN
> and everyone will be swamped with everyone else's broadcast traffic
no, AFAIK not true. You will be swamped by olsr TC messages, but this is
ok since freifunk-olsr included the fish-eye algorithm

> * Using OLSR on every node is like trying to create a city-wide network with
wrong. It is more like trying to put routing decisions at every point 
with lots of host routes (which are ok, since your net is limited in
size - host routes would not scale to the whole internet)

> I think I have answers for most of these questions, but I'd like to get some
> ideas from the wider OLSR community.  I'm sure many of you have faced
> similar criticisms, and may have some experience behind you to refute these
> claims.  If so, I'd love to hear from you!

I would be interested in better answers.

best regards,

> Regards,
> Dan Flett
> Secretary
> Melbourne Wireless 
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