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Date:      Wed, 19 Dec 2001 20:39:29 +0000
From:      Josh Paetzel <friar_josh@webwarrior.net>
To:        Alex Popa <razor@ldc.ro>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Two ethernet interfaces in the same subnet
Message-ID:  <20011219203929.D410@twincat.vladsempire.net>
In-Reply-To: <20011220001032.A74557@ldc.ro>; from razor@ldc.ro on Thu, Dec 20, 2001 at 12:10:32AM %2B0200
References:  <20011220001032.A74557@ldc.ro>

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On Thu, Dec 20, 2001 at 12:10:32AM +0200, Alex Popa wrote:
> Hello!  I would like to have the following setup, in order to implement
> load balancing:
> 
> [ internal net ] --(100M)-- FreeBSD Box -+--(10M)---CM 1  - [ internet ]
>                                          `--(10M)---CM 2  - [ internet ]
> 
> CM1 and CM2 are two cable modems, connected to the same cable modem
> network.  I would like to communicate to some host that is outside the
> cable address space through both interfaces.
> 
> Suppose my two addresses are 123.123.123.2 and 123.123.123.3, and the
> gateway should be 123.123.123.1.  I would get lots of "arp:
> 123.123.123.1 is on ed0 but got reply from ed1" messages, and I think
> there might be a conflict between the two interfaces, which would have
> to be configured in the same /24 net (in this example, 123.123.123.0/24)
> 
> Any ideas how to solve this?
> 
> Thank you
> 	Alex

AFAIK it's not possible.  You can link two dialup connections with 
ppp, but that requires support from the ISP as well as the OS/ppp 
software.  To really use two connections like that you would need a 
real router that could run a real routing protocol.

Josh


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