re0 "no carrier" problem - Patches found in archives didn't work.

[Julien Gabel]

>> this may seem obvious, but do you still have the same issue if you
>> statically define the mediatype to a fixed link speed and duplex?
>> lots of interfaces have problems negotiating autoselect with
>> switches, as protocols vary widely.  the blinking is indicative of
>> autoselect setup woes...

> When I set the media by hand it showed 'active', but no data could be
> transmitted (yellow link diode on switch, not blinking). I then pulled
> the switch with my home lan from the wall and plugged my re0 instead -
> It worked!
>
> So this seems to be the %$R#(@%*$ switch issue. The funny thing is, that
> with media set manually (or sometimes with autoselect) everything works
> fine with this switch (i have used it all day yesterday till evening
> without problem). Now, when i wait some time with media manually set, it
> starts transmitting data and everything works fine.
> Why does it happen? Why is it so unpredictible? Can it be fixed in
> software, or should i throw the switch out the window and by a new one?

Not sure if it is solely "switch related".  I encountered the very same
problem for months now using different links ans switches.  Moreover, it
seems to be FreeBSD specific since the same machine works better with
others OSes.

See PR kern/80005 for a more long description on a very similar problem.

-- 
-jpeg.