[olug] Ethernet Auto-negotiation and Duplexing on Linux
Derek & Lisa
olug at robotz.com
Fri Aug 8 18:32:35 UTC 2003
Ethernet Auto-negotiation and Duplexing on Linux
We recently had an issue where our Fiber provider informed us our Linux router
had to be hard set to auto negotiate off, 10mbps full duplex. The unit in
question had old NE2000 complaint drivers/cards. Currently there is
approximately 20% bandwidth drop across this unit. Turning autoneg off and
settings the parameters manually is supposed to fix this throughput issue
according to our fiber provider. The unit is connected directly to their
fiber equipment (starting with a Lucent switch) which apparently does not
Ethertool is a nifty utility that is supposed to allow you to set these
parameters in the Ethernet device. The alternative is to find the parameters
for the proprietary device to pass along to the driver, which is different
for every driver.
Ethertool was unable to set the autoneg, duplex, and speed options for the old
NE2000 compatible NIC's. I swapped the old NIC's out for new Intel 10/100
cards and ethertool seems to function with the new NIC's.
My two options are a) use ethertool to set the parameters or b) use the
correct string for the Intel driver passed along in (/etc/modules?) directly
to the card.
I chose to use ethertool, and it claims it was able to pass the parameters
along to the Ethernet device.
My questions are, should I trust ethertool? And, does anyone have experience
with turning auto-negotiation off on an Ethernet device under Linux?
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