intrebare banala ubuntu 10.10

sunt incepator la linux.
am instalat si eu ubuntu 10.10 server (cu ajutorul tutorialelor).
am si eu doua intrebari la care as dori raspunsuri ca pentru pufani ...
1) la rebootari (restart) de sistem incepe cu loghin si pass. Cum fac ca sa depaseasca chestia asta si sa booteze cu predefinit ?
2) la crearea IP-lui static fac asa:
-----------------------------------------------------------------
nano /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1
-------------------------------------------------------------------------------------------
sterg DHCP si scriu in loc: static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1

salvez cu CTRL+X

dar la rebootare iar am DHCP si nu IP-ul meu static.
Unde gresesc ?
Va multumesc