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Date:      Wed, 25 Mar 2009 10:37:01 +0700 (ICT)
From:      Olivier Nicole <on@cs.ait.ac.th>
To:        freebsd-questions@freebsd.org
Subject:   Re: Creating a 10km wireless bridge...pointers?
Message-ID:  <200903250337.n2P3b125092026@banyan.cs.ait.ac.th>
In-Reply-To: <49C99CAB.2050904@m2.seamanpaper.com> (message from Jeff Dickens on Tue, 24 Mar 2009 22:53:31 -0400)
References:  <64c038660903210543v1cebe63fr4424bebc58076e4a@mail.gmail.com> <49C99CAB.2050904@m2.seamanpaper.com>

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Hi,

> I have been tasked with getting a DSL connection across about 10km of
> no-man's-land to a rural location without internet access. Ideally,
> all traffic inbetween the two directional antennas would be encrypted.
> (Nice, but not entirely required.) 3Mb/s would be great! Something
> like:
>
> LAN<->BSDrouter<->modem<->Antenna<~~air~~>Antenna<->modem<->DSL
>
> I'm looking for general pointers of both hardware and software to
> achieve this. 
> I'd like to employ FreeBSD as much as is feasible. This
> is my first WAN network project, so even newbie pointers and general
> references would be much appreciated. (Hardware suggestions, books to
> read, etc.) Reliability is of mild concern, simply because I don't
> want to drive 10km at 3:00am when something breaks.
>
> Tips? References? Advice?

We have something of the sort runing between a Thai university and the
National University of Laos. Purpose is to connect the Lao University
to the Thai university and research network. Expected speed is 10Mbps.
You can email me personnally at the end of April, then I will be able
to give you more details :)

I will not go to Laos before one month, until then I cannot remember
the brand of the radio equipment. National University of Laos used to
have their network with remote campus locations build over air, using
public grade WiFi access-points, they were not really stable.

Regarding your set-up, I think it is nothing different from:

	  LAN<->BSDrouter<-1->DSL

only the link between the BDSrouter and the DSL provider is a bit
longer.

On your concern about traveling 10KM at 3:00, you can locate the
BSDrouter at either end of the radio link, it will not change much of
the volume of traffic crossing the radio link, unless the BSDrouter is
also doing some heavy proxying. So you could locate the BSDrouter at
the closest end to your home.

Only one remark, if that BSDrouter is to serve as DHCP and such, it is
best located at the LAN end: if the radio link goes down, the clients
on the LAN can still access their DHCP server, and they can still
communicate inside the LAN. If the BSDrouter is located at the DSL end
and the radio link goes down, the clients in the LAN will not manage
to get IP and will not be able to communicate among eachothers.

Best regards,

Olivier



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