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load the 802.1q module:

Fedora:

sudo su -c 'echo "alias vlan 8021q" >> /etc/modprobe.conf'

Ubuntu:

sudo su -c 'echo "8021q" >> /etc/modules'

Add LVAN interfaces:

Ubuntu:

Add the following lines to /etc/network/interfaces

auto eth0.15
iface eth0.10 inet static
address 10.0.15.20
netmask 255.255.255.0
vlan-raw-device eth0