802.1Q VLAN Support

modulename: 8021q.ko

configname: CONFIG_VLAN_8021Q

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>802.1Q VLAN Support
In linux kernel since version 2.6.12  
Select this and you will be able to create 802.1Q VLAN interfaces
on your ethernet interfaces. 802.1Q VLAN supports almost
everything a regular ethernet interface does, including
firewalling, bridging, and of course IP traffic. You will need
the 'vconfig' tool from the VLAN project in order to effectively
use VLANs. See the VLAN web page for more information:
<http://www.candelatech.com/~greear/vlan.html>

To compile this code as a module, choose M here: the module
will be called 8021q.

If unsure, say N.

source code: