To stop that, just stop the automatic features. You may start connecting after logging in.
To stop the automatic features, issue the command in Terminal after typing su and password:
Modify the lines below using the # sign:
# auto lo
# auto wlan0
# auto eth0
Lines starting with the # sign are ignored by the software. These lines help human beings to understand the file. This use of the # sign is referred to as "commenting out". Some other signs may be needed in other software items.