Subject: Re: full duplex ethernet trouble
To: John Nemeth <>
From: Charles M. Hannum <>
List: tech-userlevel
Date: 07/19/2004 03:18:21
On Monday 19 July 2004 02:58, John Nemeth wrote:
> On Sep 26,  2:32pm, Martin Husemann wrote:
> } On Thu, May 06, 2004 at 10:27:10AM -0700, Dave wrote:
> } > Since both cards on the network were the same make and model and both
> had } > identical /etc/ifconfig.tlp0 contents, that can't be right.  Using
> } > "auto" in place of "100baseTX" cleared up all the problems.
> }
> } AFAICT NetBSD only does proper NWAY negotiation if media is set to auto.
> } So the switch needs to be hard-wired (if it can even do that) if you
> } hardwire the mode on the NetBSD side.
> }
> } This is a bug, and it should be fixed.
>      This is debatable.  The standards only define "auto" and don't say
> what happens when you don't use it, i.e. using something other then
> "auto" results in undefined behaviour.  Some devices will still do
>[blah blah blah]

It's not really debatable.  We implemented "auto-advertisement" in two 
different projects I worked on, and complaints about duplex mismatches and 
whatnot effectively disappeared.