Hello Gurus,

I am having a problem with changing the ethernet card settings.

The machines is running redhat 9. It worked ok in my colleague's cube with 10mbps half duplex. When we moved it to my cube it can't connect to the network since the port in my cube is 100mbps full duplex.

I tried mii-tool and ethtool, none of them works.

# mii-tool
eth0: 10 Mbit, half duplex, no link

I tried mii-tool with -F, -r, -R and -A options, it didn't do anyting, no error messages, either.

When I tried ethtool, it gave me this error:

# ethtool -s eth0 speed 100 duplex full
Cannot get current device settings: Operation not supprted
not setting speed
not setting duplex

The card is 3COM 3c905C-TX/TX-M, the kernel is 2.4.20-31.9 if it matters.

Please help!!

Thanks a lot

http://support.3com.com/infodeli/tools/nic/3c905c.htm
Download the DOS diagnostics and copy to a bootable floppy to verfiy the adapter has not gone south.

mii-tool reports you do not have a link. Are any adapter lights illuminated when plugged into your cube? Go back to the colleague's cube and reverify everything still works.

What about your cube? Have you verified that your port (the wall connection) is still active?

Thanks michaelk.

I verified the port in my cube using a windows XP PC, the port is ok.

I moved back the linux box to my colleague's cube, it worked there, so the card is also ok.
But the weird thing is when I ran mii-tool over my colleague's cube, it also showed "eth0: 10 Mbit, half duplex, no link", but it could connect to the network.

Do I missing anything here? Please help!! TIA.

Those particular 3Com cards can be pretty hard to work with. I never got it to work properly with mii-tool (if I ever got it to work at all). I know this might not be the ideal answer, but I suggest saving yourself the trouble and ditching the adapter for something else. Most of the DLink and Netgear PCI cards work fine out of the box. Best $20 I ever spent on a NIC.