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Link products and services through a global router
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Link products and services through a global router

General Global Router network configuration instructions for all Selectel products. For examples of configuration for individual products (dedicated servers, cloud databases, Managed Kubernetes) see Link products and services through a global router.

For your information

Some dedicated server configurations Chipcore Line cannot be added to the global router's network because they do not have a port to connect to the private network. You can check the availability of a port for the private network in the control panels on the server page under the tab Ports.

  1. Create a global router.
  2. Connect networks and subnets to the global router to each VLAN and cloud platform project, the servers from which to aggregate. For VMware-based clouds You can only add networks and subnets via technical support.
  3. Assign IP addresses from the created subnets to the servers.
  4. Optional: route the servers.
  5. Optional: configure routing on the global router.

Create a global router⁠

  1. В control panels go to Network services → Selectel Global Router.
  2. Click Create a router. Each account is set limit to five global routers.
  3. Enter the name of the router.
  4. Click Create.
  5. If the router was created with status ERROR or hovered in one of the statuses, file a ticket.

Connect networks and subnets to the global router⁠

Use for a dedicated or hosted server.

You can connect a new network to the router or an existing network if it is not already connected to any of the account's global routers.

  1. В control panels go to Network services → Selectel Global Router.

  2. Open the router page → tab Networks.

  3. Click Create a network.

  4. Enter a network name, this will only be used in the control panel.

  5. Select a service Dedicated servers.

  6. Select pool.

  7. Select VLAN. If you want to create a network up to the internal segment (Q-in-Q), specify its tag, a number from 2 to 4094. If there is already a network up to the VLAN, be sure to specify the Q-in-Q segment of this VLAN.

  8. Enter the subnet name — this will only be used in the control panel.

  9. Enter the CIDR — IP address and private subnet mask. You can enter a new subnet or an existing private subnet of the server if it is not already added to any of the global routers in the account. The subnet must meet the conditions:

    • belong to the RFC 1918 private address range: 10.0.0.0/8, 172.16.0.0/12 or 192.168.0.0/16;
    • have a size of at least /29, as three addresses will be occupied by Selectel network equipment;
    • Do not overlap with other subnets added to this router: The IP addresses of each subnet on the router must not overlap with the IP addresses of other subnets on the router;
    • If Managed Kubernetes nodes will be included in the global router network, the subnet must not overlap with the ranges 10.250.0.0/16, 10.10.0.0/16 и 10.96.0.0/12. These subnets participate in the internal addressing of Managed Kubernetes, their use may cause conflicts in the global router network.

  10. If you have specified a Q-in-Q tag, make sure to set up a Q-in-Q. When configuring, use the subnet you specified in step 9.

  11. Enter the gateway IP or leave the first address from the subnet assigned by default. Do not assign this address to your devices to avoid disrupting the network.

  12. Enter service IPs or leave the last addresses from the subnet assigned by default. Do not assign these addresses to your devices to avoid disrupting the network.

  13. Click Create a network.

  14. Optional: check the network topology on the global router. В control panels go to Network services → Selectel Global Router. Open the page of the desired router and click Network map.

assign IP addresses to the servers⁠

On each server that joins the global router network, configure a local port to work with the subnet created on the router. On the port, assign an IP address from a private subnet that you plugged into a global router for the corresponding VLAN or project.

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

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

    vi /etc/netplan/01-netcfg.yaml

  3. Add or change values for the network interface settings of the private network:

        <eth_name>:
                addresses: [<ip_address>/<mask>]

    Specify:

    • <eth_name> — name of the network interface of the private network;
    • <ip_address>/<mask> — The private IP address of the server with a subnet mask, for example, 192.168.0.2/29.

  4. Press the key ESC.

  5. Exit the text editor vi with the changes intact:

    :wq

  6. Apply the configuration:

    netplan apply

  7. Optional: reboot the server.

Prescribe routes on the devices⁠

If you create a new server and add it to an existing global router network, you do not need to specify routes. In this case, the server will be immediately available to other devices on the network.

If you are adding an existing server to the global router network, you must static routes to all subnets with which you want connectivity.

Example of static routes organization⁠

It is necessary to configure private communication between two dedicated servers in SPB-2 pool and a cloud server in ru-2 pool. To do this you need to:

  1. Create a global router with two private subnets — 192.168.0.0/29 to the VLAN that contains the dedicated servers in the SPB-2 pool, and 172.16.0.0/29 before the cloud platform project in the ru-2 pool.

  2. Assign addresses from subnets to servers.

  3. Prescribe routes:

    • on each server in the SPB-2 pool to a subnet. 172.16.0.0/29 through the gateway 192.168.0.1;
    • on the server in the ru-2 pool to the subnet. 192.168.0.0/29 through the gateway 172.16.0.1.

Пример организации статических маршрутов
Пример организации статических маршрутов

Prescribe static routes⁠

  1. Connect to the server.

  2. Open the network configuration file:

    vi /etc/netplan/01-netcfg.yaml

  3. At the end of the data block of the desired network interface, add a route:

    routes:
      - to: <ip_address>/<mask>
        via: <gateway>

    Specify:

    • <ip_address>/<mask> — subnet to which you want to route, specifying the mask, for example, 192.168.0.0/29;
    • <gateway> — gateway for the current server subnet, which is specified on the global router.

  4. If you need to prescribe multiple routes, add them sequentially in the same block, for example:

    routes:
    - to: 192.168.0.0/29
        via: 172.16.0.1
    - to: 192.168.1.0/29
        via: 172.16.0.1

  5. Save the file.

  6. Check the settings:

    sudo netplan try

  7. Apply the changes:

    netplan apply

Configure routing on the global router⁠

You need to prescribe static routes or configure dynamic BGP routing on the global router if you:

  • organize Internet access on the global router network through one of the connected devices;
  • or you plan to use a network larger than /29 and your server as a router.
  1. В control panels go to Network services→ Selectel Global Router.
  2. Open the router page → tab Static routes.
  3. Click Create a route.
  4. Enter a route name — any name, it will only appear in the control panel.
  5. Enter the CIDR of the destination subnet, which is the private subnet to which you want to direct traffic. The destination subnet must not overlap with subnets on the global router. To direct Internet traffic to one of the devices on the global router network, specify 0.0.0.0/0.
  6. Enter the IP address Next hop — the IP address of the server through which traffic will be routed to the destination subnet. The IP address must belong to one of the subnets on the global router.
  7. Click Create.