From owner-freebsd-hackers Wed Jan 22 23:59:42 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id XAA05080 for hackers-outgoing; Wed, 22 Jan 1997 23:59:42 -0800 (PST) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id XAA05064 for ; Wed, 22 Jan 1997 23:59:19 -0800 (PST) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id IAA21307; Thu, 23 Jan 1997 08:14:26 +0100 From: Luigi Rizzo Message-Id: <199701230714.IAA21307@labinfo.iet.unipi.it> Subject: Re: Fault-tolerant network with 2 ethernets To: amcrae@cisco.com (Andrew McRae) Date: Thu, 23 Jan 1997 08:14:25 +0100 (MET) Cc: jdp@polstra.com, hackers@freebsd.org In-Reply-To: <199701230714.SAA16460@metaplex-ss10.cisco.com> from "Andrew McRae" at Jan 23, 97 06:13:55 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > 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/ _____________________________|______________________________________