NIC card problems

[Cleber P. de Souza]

Remember that the wire must use four pairs to operate at 1Gb.


On 6/15/05, Will McDonald <wmcdonald at gmail.com> wrote:
> On 6/15/05, Bill Tangren <bjt at aa.usno.navy.mil> wrote:
> > Will McDonald wrote:
> > > On 6/15/05, Bill Tangren <bjt at aa.usno.navy.mil> wrote:
> > >
> > >>This server has dual NIC cards (Intel Corp. 82541 GI/PI Gigabit Ethernet
> > >>Controller)
> > >>
> > >>I set both up, but they don't seem to be working properly. The minihub
> > >>they are plugged into indicated they are running at 10 mbps.
> > >
> > >
> > > Have you looked at the output of...
> > >
> > > ethtool eth0
> > > ethtool eth1
> > > mii-tool
> > > /sbin/ifconfig -a
> > > netstat -rn
> > >
> > > The cards could be negotiating the wrong link speed/duplex settings
> > > with the hub. If your mini hub only supports 10MBit/Half-duplex then
> > > try fixing the cards at that speed.
> > >
> > > Will.
> > >
> >
> > How do I fix the card speed?
> 
> It depends which utility "works" on your system.
> 
> On some older 10/100 MBit interfaced rackmount systems we manage
> ethtool doesn't report anything and mii-tool reports link status
> accurately.
> 
> On newer boxes with GBit interfaces mii-tool reports 100 MBit link
> speed for links which ethtool reports 1000 MBit and that is the actual
> speed of the interfaces.
> 
> Read the man page for ethtool and mii-tool or Google for how to
> actually "fix" interface speeds.
> 
> http://www.google.co.uk/search?hl=en&q=ethtool+mii-tool&meta=
> 
> If I remember rightly sometimes it can be done when loading the driver
> from /etc/modules.conf / /etc/conf.modules , other times you might
> have to do it somewhere like /etc/rc.d/rc.local using
> mii-tool/ethtool.
> 
> Will.
> 
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-- 
Cleber P. de Souza