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Date: Tue, 1 May 2001 13:53:09 -0500 (CDT)
From: Nick Rogness <nick@rogness.net>
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To: Ted Mittelstaedt <tedm@toybox.placo.com>
Cc: Ken Bolingbroke <hacker@bolingbroke.com>, questions@FreeBSD.ORG
Subject: RE: Redundant Internet connections
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On Mon, 30 Apr 2001, Ted Mittelstaedt wrote:

> >On Sat, 28 Apr 2001, Ken Bolingbroke wrote:
> >
> >>

> >> Given a FreeBSD box with _two_ independent connections to the
> internet, >> and also serving as the gateway to a third, private
> network, how would I >> configure it to use both Internet links as
> "default" routes?  I would >> prefer one over the other, but need it
> to fall back to the second if the >> first goes offline.

> >
> >
> >	//Add backup route
> >	# route add -net 0.0.0.0 X.X.X.X -netmask 0.0.0.0 -nostatic
> >
> >	//Add primary route
> >	# route add -net 0.0.0.0 A.A.A.A -netmask 128.0.0.0 -nostatic
> >	# route add -net 128.0.0.0 A.A.A.A -netmask 128.0.0.0 -nostatic
> >
> >
> >	A.A.A.A is your primary gateway and X.X.X.X is your backup
> >	gateway.
> >
> >	This does no load balancing but if interface that connects to
> >	A.A.A.A goes down, the secondary oute will take affect.
> >
> 
> Muh ha ha ha ha!!!  (evil cackle)
> 

> Yes, this is the ham-handed way to attempt this with only one tiny
> problem:
> 

> Supposing that both interfaces into the FreeBSD router are Ethernet?  
> (say, 2 DSL connections)  A DSL modem will NOT shut down it's Ethernet
> interface if the DSL circuit to it goes down.  What then?

	Your SOL!  This is only works real well when your ethernet
	interface goes down.


Nick Rogness <nick@rogness.net>
 - Keep on Routing in a Free World...
  "FreeBSD: The Power to Serve!"


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