disable network connection on boot
 

Hello!
I have two questions:
First:
I'v internet by a Lan. But I wan install a modem in the own computor. My question is:
Wath I must to do for the network don't begin on the boot (disable this service)?
And, what I must to do for the network return to begin on boot?
It's like: what I must to do to enable and disable my eth0 connection on boot...
How can I do that?
I use debian.
The 2nd question, is that: it's easy cofigure speedtouch 330 to connect me to net by adsl?

Comment away the
"auto eth0"
from /etc/network/interfaces

Now you can start your network manually by using command
and stop it with