I don’t think so you have any problem. See some Ethernet (NIC) card only works with either mii-tool or ethtool. In this case mii-tool is not compatible with your network card.
One of my server only support ethertool and other only support mii-tool. So depending on which type of Ethernet card is installed on the system you need to use any one of the command.
Other way to verify speed:
After server reboot type command at shell prompt
Code:
# dmesg | grep -i duplex
OR use wget command to download file from bond0 interface which will tell you speed. This is method needs configuration of web server.
Goto other linux desktop which connected to same switch
Code:
# wget http://ip-bond0-server/largefile
Hope this helps