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Date:      Fri, 1 Aug 2003 21:30:51 +0200 
From:      "Oldach, Helge" <Helge.Oldach@atosorigin.com>
To:        "Michael W. Oliver" <michael@gargantuan.com>
Cc:        freebsd-net@freebsd.org
Subject:   RE: Multipath Routing
Message-ID:  <D2CFC58E0F8CB443B54BE72201E8916E94C9B8@dehhx005.hbg.de.int.atosorigin.com>

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> I am no programmer, so forgive my ignorance in that respect, but why can't
a 
> metric be used to differentiate routes to the same destination network 
> within the routing table?  I happened to be googling and found:
> 
> http://daily.daemonnews.org/view_story.php3?story_id=3878
> 
> which describes a patch to -STABLE that does exactly what I am talking 
> about.

Routing will always follow the better metric. That's the paradigm. So
if you have two routes the one with the better metric will always rule.

Frankly, I don't quite see the rationale for such a hack. This can be
solved using available mechanisms such as VRRP (or HSRP, if the gateways
are decent routers).

Furthermore:

  It doesn't detect when remote hosts are down. This is not the job of the
  kernel. It's not a routing protocol, it's not an automatic failover
system.

So what is this good for, that cannot be solved by already available
mechanisms?

Helge


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