Creating a VLAN interface

VLANs are isolated broadcast domains that run over a single physical network. They allow you to segment a local network and also to "stretch" a LAN over multiple physical locations. Most enterprises implement this on their network switching environment, but in some cases, the tagged VLANs reach your server.

Getting ready

In order to configure a VLAN, we need an established network connection on the local network interface.

How to do it…

For the sake of ease, our physical network interface is called eth0. The VLAN's ID is 1, and the IPv4 address is 10.0.0.2, with a subnet mask of 255.0.0.0 and a default gateway of 10.0.0.1.

Creating the VLAN connection with nmcli

With nmcli, we need to first create the connection and then activate it. Perform the following steps:

1. Create a VLAN interface using the following command:

   ~]# nmcli connection add type vlan dev eth0 id 1 ip4 10.0.0.2/8 gw4 10.0.0.1
   Connection 'vlan' (4473572d-26c0-49b8-a1a4-c20b485dad0d) successfully added.
   ~]...