Hi,
How can i check the speed of the Ethernet card that my Sun server has and also how can i change it to full Duplex if it is set to half duplex? What is the file that takes care of this?
Check out ifconfig.
There is no file to change from half to full duplex. You have to use the ndd commands (see the man page).
You can search this site for ndd and find more questions (with answers) on this subject. If you need further help, post back.
Will ifconfig allow the duplex to be changed under Solaris? I could've swore that it did.