Xubuntu -- how to auto setup done to vlan mode.

AS we know Xubuntu has file to control ethernet interface *1, and xfce also has program to touch it, now I disable xfce all interface setting and keep pppoe for eth2.

*1 /etc/network/interface,
    auto eth0.200
    iface eth0.200 inet static
    address 192.XXX.XXX.XXX
    netmask 255.255.255.0
    # gateway 192.OOO.OOO.OOO

 Before above We need install vlan packet and name "vlan".
 Auto mount module 802.1q, /etc/modules and fill the name 8021q.
 Run vconfig add 200 eth0