port: SIOCSIFMAP: Operation not supported

Kostko · 04-22-2004, 09:40 AM

When i want to set full-duplex 100mbit mode via ifconfig (ifconfig eth0 media 100baseTx) i get the following error:

port: SIOCSIFMAP: Operation not supported

NIC (RTL8139) supports 100mbit/s and full-duplex mode, so i really don't know what could be the problem ?

/bin/bash · 04-23-2004, 08:01 PM

Try this:

ethtool -s eth0 speed 100 duplex full

disc0stu · 05-13-2004, 04:09 PM

This didn't work for me either

Code:

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

3Com NIC, 2.6 mm-sources

jimmydageek · 04-02-2005, 08:52 PM

You might want to force half duplex. I have seen that with two of my servers. Kind of a bandwidth bummer, but nothing compared to having a link with one card trying its hardest to do full-duplex and the other...not.

I just forced half-duplex on both sides of the link (switch port and server eth0) and stuff is moving at megabits/sec rather than 7kbps.

/bin/bash · 04-12-2005, 12:41 AM

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

You should do this as root.

cemcan · 10-14-2007, 09:52 AM

Keep in mind that you may get that error while using VMware or an equivalent. You should also read your messages at /var/log/messages. If you can provide that output, we may have a chance to solve that problem.

Regards.