apt-get install vlan

modprobe 8021q

grep -q 8021q /etc/modules || echo 8021q >> /etc/modules

vim /etc/network/interfaces

auto eth0.99
    iface eth0.99 inet static
    address 192.168.99.1
    netmask 255.255.255.0
    vlan-raw-device eth0

ifup eth0.99