sudo + mount in Debian 5.0

aptitude install sudo
visudo: (man sudoers)

opera debian=(PASSWD): /bin/mount, /bin/umount

(username hostname=(NOPASSWD\PASSWD\noexec): command)
(for sudo works well, need to configure hostname properly)

configuring network:

edit /etc/hostname:

debian

edit /etc/hosts:

127.0.0.1 localhost
192.168.0.1 debian

(it seems to cause some problem if written as 127.0.0.1 localhost debian)

edit /etc/network/interfaces:

iface eth0 inet static

address 192.168.0.1
netmask 255.255.255.0

add alias to ~/.bashrc:

alias mount='sudo /bin/mount -o umask=000'
alias umount='sudo /bin/umount'