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Public networks and subnets of a dedicated server

A public (Internet) network is a network for server access to the Internet using public IP addresses.

The server is automatically added to a shared public VLAN and assigned one IPv4 public IP address from a shared subnet.

Network parameters (IP address, subnet mask, default gateway) can be viewed in the control panel: in the top menu, click Products → Dedicated Servers → Network → the Subnet tab → subnet page.

To get additional IP addresses, order a dedicated subnet and configure it. When ordering a dedicated subnet, IP addresses are allocated to the account in a dedicated VLAN. No more than one dedicated public VLAN per pool is allocated to an account.

The IP addresses of a dedicated subnet can be used on account servers located in the same pool (IP addresses work only within a single pool). When ordering a dedicated subnet, you can use either an address from the shared subnet or from the dedicated one. You cannot use both IP addresses simultaneously.

You can view the VLAN assigned to a port in the control panel: in the top menu, click Products → Dedicated Servers → Servers → server page → the Ports tab.

The network interface on the server is configured automatically only during automatic OS installation. When installing an OS from a custom image, you must manually configure the network interface on the server.

When configuring the network, we recommend using Selectel recursive DNS servers, but you can specify any public DNS servers.

All traffic (incoming, outgoing) passing through the internet port is aggregated and billed according to the traffic billing plan.

Network limits are set on ports:

  • on the number of MAC addresses — 25 MAC addresses per switch port;
  • on broadcast traffic — 10 MB/sec per port for each individual traffic type.

Dedicated servers are under Selectel DDoS protection by default. For a public dedicated VLAN, you can enable a basic firewall for free.

A custom configuration server can be disconnected from the public network; to do this, submit a ticket. After disconnecting from the public network, installing an OS on the server via automatic installation will no longer be possible.

Public shared IP addresses

Public shared IP addresses are located in a shared subnet and have a fixed prefix of /24 (mask 255.255.255.0). The shared subnet also contains servers of other clients, and servers in the same account may end up in different shared subnets. For security, IP spoofing protection is used in the shared subnet.

A public shared IP address does not support:

  • connecting DDoS protection;
  • configuring static or dynamic routing;
  • unblock some blocked ports and internet resources;
  • configuring a BGP connection and BGP + anycast subnet;
  • simultaneously using a public dedicated IP address;
  • reassign the address to another server (including using VRRP, CARP, Keepalived, Corosync, etc. for server redundancy).

To change the IP address on the server, add additional public IP addresses.

Public dedicated IP addresses

Public dedicated IP addresses are located in a dedicated subnet and can have any prefix (mask). IP addresses from a dedicated subnet can be used on account servers located in the same pool. To get a public dedicated IP address, add additional public IP addresses.

Connect additional public IP addresses

After ordering a dedicated subnet, you cannot use the public shared IPv4 address that was automatically allocated when the server was ordered.

  1. Order a dedicated subnet.
  2. Add the IP address to the accounting system.
  3. Change the network settings on the server.
  4. Switch the VLAN on the server port.

1. Order a dedicated subnet

  1. In the control panel, in the top menu, click Products and select Dedicated Servers.
  2. Go to the Network section.
  3. Click Order public subnet.
  4. Select a subnet.
  5. Select the service the subnet will be used for.
  6. Select the region and pool where the subnet will be created. The subnet will be available to resources only in this pool. Moving a subnet to another pool is not possible.
  7. Select a VLAN.
  8. Specify the purpose of use.
  9. Select a billing cycle.
  10. Click Pay. When the service is ready for use, a notification will be sent in a ticket.

2. Add the public IP address to the accounting system

In the billing system, you can record which IP address is configured on your server. This will not change the network settings on the server; they must be changed manually.

  1. In the control panel, in the top menu, click Products and select Dedicated Servers.
  2. In the Servers section, open the server page → the Network tab.
  3. In the Public block, click Add IP address.
  4. Select a subnet.
  5. Select an IP address.
  6. Click .

3. Change the network settings on the server

When connecting an additional IP address in the server OS, change the network settings:

  • IP address;
  • subnet mask;
  • gateway.

Parameter values can be viewed in the control panel: in the top menu, click Products → Dedicated Servers → Network → the Public Subnets tab → dedicated subnet card.

Apply the network settings. Server availability will be lost until the VLAN is changed on the port.

4. Switch the VLAN on the server port

  1. In the control panel, in the top menu, click Products and select Dedicated Servers.
  2. In the Servers section, open the server page → the Ports tab.
  3. In the Internet row, in the VLAN column, click .
  4. In the VLAN field, select the number of the dedicated VLAN in which you ordered a dedicated subnet in step 7.
  5. Click Configure. Access to the server will be restored with the new IPv4.

Return to the shared public IP address

  1. In the control panel, in the top menu, click Products and select Dedicated Servers.
  2. In the Servers section, open the server page → the Ports tab.
  3. In the Internet row, in the VLAN column, click .
  4. In the VLAN field, select Shared.
  5. Click Configure.
  6. In the server OS, change the parameter values of the public network interface. Learn more in the Configure the network interface on the server instructions. Parameter values for working with a public IP address from a shared subnet (/32) can be viewed in the control panel: in the top menu, click Products → Dedicated Servers → Network → the Subnet tab → dedicated subnet card.