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Date:      Fri, 15 Nov 2002 10:53:23 +1000 (EST)
From:      Ernie Elu <ernie@spooky.eis.net.au>
To:        perisa@porsche.de (Marc Perisa)
Cc:        freebsd-isp@freebsd.org
Subject:   Re: Load balancing two unrelated links
Message-ID:  <200211150053.gAF0rNwZ045349@spooky.eis.net.au>
In-Reply-To: <3DD3E448.2090607@porsche.de> from "Marc Perisa" at Nov 14, 2002 06:58:32 PM

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> 
> Ernie Elu wrote:
> > I have a situation where there are two links running from one site to
> > another, one link is an ADSL 2MB service and the other is a 2MB Frame relay,
> > there is a FreeBSD box at each end that is connected to both services
> > routers by ethernet, and static routes with no load balancing whatsoever. 
> > What's the most practical way to balance and share these links so it behaves 
> > as close as possible to a single 4MB service.
> > 
> > - Ernie.
> 
> Hi Ernie,
> 
> are the FreeBSD boxes in the two locations connected like this?
> 
> 
>           --- router a/1  -> ADSL
>          /
> beastie1
>          \
>           --- router b/1  -> Frame Relay
> 
> 
> And in the other location vice versa?
> 
> Then you should install gated (or similar) and enable OSPF on the 
> FreeBSD machines over the two links. Dynamic routing is the only thing 
> which can help you.
> 
> Perhaps you would like to install a second FreeBSD box in each location 
> and connect the second box with _both_ routers. Because if a single box 
> fail the other could take over (if the rest of the network is designed 
> for that).
> 
> Hope that helps
> 
> Marc
> 

They are not quite like that but they can be made to look so with a few
static routes. Both have zebra and vtund installed, I looked at using bgp
but I felt it was not really an interior protocol, your suggestion of
looking at OSPF makes sense from a relaibility point of view, I was not sure
it would help aggregate the speeds, but I am happy to give it a try and do
some tests. Thanks for the suggestion.

- Ernie.

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