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Date:      Thu, 23 Jan 1997 08:14:25 +0100 (MET)
From:      Luigi Rizzo <luigi@labinfo.iet.unipi.it>
To:        amcrae@cisco.com (Andrew McRae)
Cc:        jdp@polstra.com, hackers@freebsd.org
Subject:   Re: Fault-tolerant network with 2 ethernets
Message-ID:  <199701230714.IAA21307@labinfo.iet.unipi.it>
In-Reply-To: <199701230714.SAA16460@metaplex-ss10.cisco.com> from "Andrew McRae" at Jan 23, 97 06:13:55 pm

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> > A client wants a fault-tolerant LAN setup like this:
> > 
> >     ethernet A (100BaseT)
> >     ---+------+------+------+------+------+---
> >        |      |      |      |      |      |
> >      host   host   host   host   host   host
> >        |      |      |      |      |      |
> >     ---+------+------+------+------+------+---
> >     ethernet B (100BaseT)

as already mentioned, using 100baseT you hare more likely to have
single wire failures rather than network failures; that might make the
problem different.

A problem with BSD networking is that once a connection is opened, the
socket is bound to a specific interface and so it does not help  to
have multiple paths starting from the same host. I forget the details,
but have been told that there is a very minor modification (a few
lines) that fixes this problem.

Another trick (inefficient) you might use is to make all your
traffic through tun0 and then write your own forwarder for outgoing
traffic.

	Luigi
-----------------------------+--------------------------------------
Luigi Rizzo                  |  Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it    |  Universita' di Pisa
tel: +39-50-568533           |  via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522           |  http://www.iet.unipi.it/~luigi/
_____________________________|______________________________________



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