Linux VLAN Trunking

Basic VLAN Trunking for Linux.

Goal of Lab

• Create sub-interfaces with VLAN tagging enabled

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

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 VLANS

vconfig add "interface" "VLAN"

VLAN's 10, 20, 30, and 40 are now created (as sub-interfaces), labeled as eth0.10, eth0.20, eth0.30, eth0.40

Verify the VLANS / Sub-interfaces are up by running the ifconfig command

Step 4

Configure IP Addresses on the VLANS / sub-interfaces.

ifconfig "interface.VLAN" "ip address" netmask "subnet mask"

Step 5

Configure the default gateway (add a route) for each VLAN / sub-interface

route add -net "network address" netmask "subnet mask" gw "default gateway"

The server should now be trunking VLANS 10,20,30, and 40 over eth0