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Date: Wed, 16 Apr 2008 10:41:17 -0700
From: Julian Elischer <julian@elischer.org>
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To: "M.S. Motanu" <miauris@gmail.com>
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Cc: freebsd-hackers@freebsd.org, Qing Li <qingli@freebsd.org>
Subject: Re: Multipath routing - failover version
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M.S. Motanu wrote:
> I've ported the multipath routing patch by Ed Tanzer
> <tanzer@dsm.fordham.edu
> <https://mail.stsnet.ro/squirrelmail/src/compose.php?send_to=tanzer%40dsm.fordham.edu>>
> for FreeBSD 4.8-STABLE to FreeBSD 6.1-RELEASE.

multipath routing was just committed to -current and will be merged 
back possibly. it may be worth seeing what there is in common,
and if some features need to be cross-pollinated.


> 
> The patch modifies the kernel and the userland programs netstat and route
> so that for the same destination it is possible to specify two or more
> different gateways (paths).
> 
> Switching between different paths is done by the kernel based on the link
> state of the interface associated with the gateway. This way when can
> achieve a level of redundancy at the link level (this is not a routing
> protocol!).
> 
> The original patch did not have failover in mind, it addressed the problem
> of load balancing. But the same results can be achieved with this patch
> with minor changes to the code.
> 
> The patch files and installation instructions can be downloaded
> from:http://miauris.freehostia.com/mpath/mpath.tar.gz
> 
> Comments are welcomed!
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