[vortex] Problem with Nokia ADSL modem/hub and 3c905

Donald Becker becker@scyld.com
Wed, 24 Jan 2001 10:41:27 -0500 (EST)

On Wed, 24 Jan 2001, Ville Herva wrote:

> I have a Nokia ADSL modem with 4 10MBit ethernet ports. I have a
> linux 2.2.18 box with one 3c905A connected to it. If I unplug the
> network cable from the Nokia box and try to plug it back, the link leds
> stay off. If If boot the Nokia box, the leds are on, but the connection
> won't work. The Nokia box doesn't answer arp etc. If I now boot the Linux
> machine, everything works again.

This is a almost certainly a bug in the Nokia's repeater.

The 3c905A uses an external MII transceiver, likely the DP83840.
First, verify that you are not passing any options to the driver -- the
driver should use the default MII mode.

Run 'mii-diag -R' as root.  This will reset the transceiver, which
briefly brings the link down than then restarts autonegotiation/autosensing.

> What might cause this? I'm guessing somekind of duplex negotiation
> failure. 

Use 'mii-diag -w' to watch the link status as you unplug the cable.

Donald Becker				becker@scyld.com
Scyld Computing Corporation		http://www.scyld.com
410 Severn Ave. Suite 210		Second Generation Beowulf Clusters
Annapolis MD 21403			410-990-9993