Howto reconfigure network automatically? [closed]

Question

Question:
When you install ubuntu-server, it lets you configure the network, with the option to do that automatically.

My computer wasn't attached at the network at the time, so I just skipped this part.
Now it is attached to the network, but of course, there is no network connection.

How can I let the automatic configuration utility run manually ?
dpkg-reconfigure ifupdown ?

Note:
I do NOT want to edit /etc/whatever manually.
I can use google to find something like http://www.iprobot.net/linux-tutorial/how-to-setup-network-interface-card-in-ubuntu/ myself.

Note also:
Console-only, so no GUI

Answer 1

Find out the interface name (probably eth0):

sudo ifconfig -a

Tell the system to enable the interface

ifup eth0

Check if the interface has correct IPs assigned:

sudo ifconfig -a

Test your connection:

ping askubuntu.com

(note: make sure your computer is attached to the network this time! :))