From owner-freebsd-net  Sat Oct  9 14:21:21 1999
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To: aron@cs.rice.edu
Cc: freebsd-net@freebsd.org, justin@apple.com, alc@cs.rice.edu,
	wollman@khavrinen.lcs.mit.edu
Subject: Re: arp errors on machines with two interfaces
From: sthaug@nethelp.no
In-Reply-To: Your message of "Sat, 9 Oct 1999 16:02:57 -0500 (CDT)"
References: <199910092102.QAA11299@cs.rice.edu>
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Date: Sat, 09 Oct 1999 23:20:59 +0200
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> > Try to think of it in terms of a traditional coax-based Ethernet, and
> > having two NICs on one host connected to the same physical Ethernet
> > cable. Would you expect this to work? (You shouldn't.)
> 
> 
> Well with the traditional Ethernet, it didn't make much sense to connect
> multiple interfaces to the same wire - you don't expect both interfaces
> together to deliver any more than 10Mbps. However, with switched Ethernet, 
> both interfaces can deliver the full b/w. So why not get the advantages of 
> getting this higher b/w as well as full one on one connectivity between 
> hosts connected to the Ethernet ?

- Because getting the advantage of this higher bandwidth requires special
support (e.g. Fast Etherchannel or other forms of load balancing/bundling)
that FreeBSD doesn't currently have in the standard configuration. It
would require considerably more than just removing one error message to
support this properly.

- Because the error message is a valuable piece of information which tells
you the system has detected something that "shouldn't happen", and which
most people would indeed consider an error.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no


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