Configure an Ethernet interface as a VLAN trunk
---------------------------------------------------

Suppose that a host requires access to two VLANs, both carried by a trunk connected to physical interface eth0. The assigned IP addresses for the host are 192.168.2.1/24 on VLAN 2 and 192.168.3.1/24 on VLAN 3.

[+] First install the vlan package if it is not already present:

apt-get install vlan

[+] Turn off network-manager

sudo stop network-manager

[+] Configuring interfaces

vconfig add eth0 <VLAN ID> (you may get a warning message on the first one)
example: vconfig add eth0 101

ifconfig eth0.<VLAN ID> <IP Address>/24 up
example: ifconfig eth0.101 192.168.1.10/24 up

ifconfig eth0.<VLAN ID>

Note: If any issues run, ifconfig eth0 0.0.0.0 up
Note: Specify interface with nmap scanning (nmap -e eth0.101)
Note: You will probably need to add individual routes for each vlan if you want to communicate between vlans, don't rely on your default gateway. (route add)

[+] Remove Configuration
vconfig rem eth0.101