Linux VLAN Trunking

Basic VLAN Trunking in Debian based Linux.

Goals of Lab

• Enable 802.1Q Tagging
• Create Virtual Interfaces

Scenario

Step 1

The first thing you'll want to do is install the VLAN package using aptitude.

aptitude install vlan

Note: if aptitude can't find the package, use the command "aptitude update" before trying to install the package.

Step 2

Load the 802.1Q module into the kernel

sudo modprobe 8021q

Then verify the module has been loaded into the kernel

lsmod | grep 8021q

The output on your screen should look similar:

Step 3

Use vconfig to add virtual interfaces / VLANS

vconfig add eth0 10

vconfig add eth0 20

vconfig add eth0 30

vconfig add eth0 40

Step 4

Configure IP Addresses on the virtual interfaces.

ifconfig etho.10 10.0.1.2 netmask 255.255.255.0

ifconfig etho.20 10.0.2.2 netmask 255.255.255.0

ifconfig etho.30 10.0.3.2 netmask 255.255.255.0

ifconfig etho.40 10.0.4.2 netmask 255.255.255.0

Step 5

Configure the default gateway for each virtual interface / VLAN

route add -net 10.0.1.0 netmask 255.255.255.0 gw 10.0.1.1

route add -net 10.0.2.0 netmask 255.255.255.0 gw 10.0.2.1

route add -net 10.0.3.0 netmask 255.255.255.0 gw 10.0.3.1

route add -net 10.0.4.0 netmask 255.255.255.0 gw 10.0.4.1