Configure VLANs on Linux

Manual Configuration

Create VLAN Interface

# Create VLAN 100 on interface eth0
sudo ip link add link eth0 name eth0.100 type vlan id 100

Assign IP Address

sudo ip addr add 10.100.0.2/16 dev eth0.100

Enable Interface

sudo ip link set dev eth0.100 up

Verify

ip addr show eth0.100

Persistent Configuration with systemd

To survive reboots, create a systemd service.

Create /etc/systemd/system/vlan-setup.service:

[Unit]
Description=VLAN Configuration
Before=docker.service
After=network.target

[Service]
Type=oneshot
ExecStart=/usr/bin/ip link add link eth0 name eth0.100 type vlan id 100
ExecStart=/usr/bin/ip addr add 10.100.0.2/16 dev eth0.100
ExecStart=/usr/bin/ip link set dev eth0.100 up
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

Enable the service:

sudo systemctl enable vlan-setup.service
sudo systemctl start vlan-setup.service

Using Netplan (Ubuntu 18.04+)

Edit /etc/netplan/01-netcfg.yaml:

network:
  version: 2
  ethernets:
    eth0:
      dhcp4: yes
  vlans:
    eth0.100:
      id: 100
      link: eth0
      addresses:
        - 10.100.0.2/16

Apply changes:

sudo netplan apply

Remove VLAN

sudo ip link delete eth0.100

Check VLAN Configuration

# List all VLANs
ip -d link show type vlan

# Show specific VLAN
cat /proc/net/vlan/eth0.100