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Customize Q-in-Q
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Customize Q-in-Q

Q-in-Q is a technology that allows you to create multiple isolated network segments within a single VLAN. It is realized by adding an additional tag to the Ethernet packet header.

  1. Enable Q-in-Q on the switch port. To do this, create a ticket to technical support and specify the UUIDs of the servers for which you want to enable Q-in-Q. Q-in-Q can only be enabled for the private network.
  2. Select a new unoccupied private subnet, the IP addresses from which will be used to configure network connectivity.
  3. Configure network interfaces-on-server: assign a Q-in-Q tag to the network interface and specify an IP address from a new private subnet.

Configure network interfaces on the server⁠

  1. Connect to the server via SSH or via KVM-console.

  2. Open the netplan utility configuration file with the vi text editor:

    vi /etc/netplan/01-netcfg.yaml

  3. Add Q-in-Q settings for the network interface of the private network:

    ...
        vlans:
          <eth_name>.<id>:
                id: <id>
                link: <eth_name>
                mtu: 1400
                addresses:
                    - <ip_address>/<mask>

    Specify:

    • <eth_name> is the name of the network interface of the private network;
    • <id> — Q-in-Q tag, a number from 2 to 4094;
    • <ip_address>/<mask> — IP address from the new private subnet (for example: 10.10.10.10.10/24).
    Example configuration file of the netplan utility
    network:
        version: 2
        renderer: networkd
        ethernets:
            eth0:
                addresses: [82.202.247.218/24]
                gateway4: 82.202.247.1
                nameservers:
                    addresses: [188.93.16.19,188.93.17.19]
            eth1:
                addresses: [192.168.0.2.2/24]
    ...
        vlans:
            eth1.40:
                id: 40
                link: eth1
                mtu: 1400
                addresses:
                    - [10.0.0.0.15/24]

  4. Press the ESC key.

  5. Exit the vi text editor with your changes saved:

    :wq

  6. Apply the configuration:

    netplan apply

  7. Optional: reboot the server.