Manually bring up network interface every time
 

I have installed ubuntu server 10.04 amd64. The problem is every time I login, there is no internet connection and I have to manually run "sudo ifconfig eth3 up". (eth3 has the cable). What should I do to automate that?

Maybe it helps to add eth3 to the auto-statement in /etc/network/interfaces.

what should I do exactly?

I don't really know, if this works, but I am assuming that.
At first open up /etc/network/interfaces in your favourite text editor, then search for a line that begins with auto and add eth3 add the end, separated with a space from the word before it.
Thes save the file, reboot and look if that has worked.

Are you using the standard Gnome network manager?

it is ubuntu server. No gnome...

I recommend wicd. That's a simple but very reliable network manager.
It should be available in your repository.
If not: http://wicd.sourceforge.net/

I recommend wicd. That's a simple but very reliable network manager.
It should be available in your repository.
If not: http://wicd.sourceforge.net/

I will try that. Thanks