Creating a 10km wireless bridge...pointers?
smithi at nimnet.asn.au
Sun Mar 22 08:59:55 PDT 2009
On Sun, 22 Mar 2009, Wojciech Puchar wrote:
> > Best encrypted, or at least use point-to-point adhoc in bridge mode
> > rather than point-to-AP unencrypted, which will surely get abused.
> quite available in Poland where people have unencrypted AP's at home.
> good antenna and you get free (and anonymous ;) access to the net.
My point exactly :)
> > easily. With +15dBm antennae you should get (at least lower) 11g rates,
> > and if you can afford 20+dBm dish grid antennae, so much the faster.
> grid antennas for 2.4Ghz are not expensive. give best available there are
> about 24dB, to have LARGE margin for noise.
It's a few years since I priced some of those, they're likely much
cheaper now. Then something like AU$200 + coax + fittings per end.
> > As others have said - avoid amplifiers, spend most on good antennae and
> amplifiers make sense ONLY when there are something on the line that damps
> the signal (like few trees) and you can't avoid that. but still it's not
> good, snow would fall on trees and then nothing will help.
There's good discussion of that and fresnel zones etc in that WNDW book.
BTW, I've since explored a bit and found what looks like a very useful
companion (free, PDF) book "How to Accelerate Your Internet" that I've
yet to read beyond the table of contents getting my attention, and a
quick browse to scope the Traffic Shaping section. http://bwmo.net/
Very timely for me anyway; I have to tackle some Debian boxes in coming
weeks, doing a crash course in iptables re both firewall and shaping.
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