you should be able to add a line to
/etc/sysconfig/network-scripts/ifcfg-eth0
ETHTOOL_OPTS="speed 10 duplex half autoneg off"
and the change will take place at boot up, or anytime you restart the
interface.
That's _exactly_ the answer for which I was looking.
Unfortunately,
it begs a couple of other questions...
1) How did you know that?
2) How could I have known that?
:-)
3) If I add my own text to ifcfg-eth0, will the network configuration
GUI deal with it properly?
--wpd