Duplex Questions

Anthony Porcano aporcano at kaplan.com
Mon Dec 9 09:31:00 CST 2002


According to /proc/net/PRO_LAN_Adapters/eth0.info the adapter is at 100
half, which does not match what procfg is reporting. My hunch is that
there is just something wrong with procfg, and I am not invested enough
in it to start debugging it at this point. I will simply use the /proc
fs for adapter state information in the future.

My plan of resolution for this issue is to force the adapters to 100
full via modules.conf so they match the switch configuration. I have
been told by a few members of this list that the preferred method would
be to let both the switch and the adapter auto-negotiate to 100 full,
but changes to the switch are out of my hands. 

Thanks to everyone on this list who took the time to respond. Your help
has been invaluable, and is much appreciated. 


-----Original Message-----
From: linux-poweredge-admin at dell.com
[mailto:linux-poweredge-admin at dell.com] On Behalf Of phr at doc.ic.ac.uk
Sent: Monday, December 09, 2002 9:25 AM
To: linux-poweredge at dell.com
Subject: RE: Duplex Questions
Importance: Low

On Sun, 8 Dec 2002, Anthony Porcano wrote:

>Our switch is hard set to 100 full, which I have been told might be the
>cause of the adapter being brought up at 100 half.

Either set both ends to autonegotiate, or neither.  Don't force one end

>This should be easy enough to fix with an entry to modules.conf forcing
>the adapter to be brought up at 100 full, but if this is the case then
>does that mean that procfg is just giving out incorrect information
>when it queries the duplex state?

I don't run procfgd, so this is guesswork, but I suspect that the dmesg
output shows you the state of the card as the driver loads. It could be
that the driver then changes when it detects the setting at the other

You don't say what /proc/net/PRO_LAN_Adapters/eth0.info reports. I
wouldn't worry about dmesg if procfg and /proc/net agree with each



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