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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 Servercore 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 Servercore 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, automatic OS installation on the server will not be available.

Public shared IP addresses

Public shared IP addresses are located in a shared subnet and have a fixed prefix /24 (subnet mask 255.255.255.0). In the control panel, shared public subnets are displayed with the prefix /32, but when configuring the network on a dedicated server, you must use the prefix /24 (subnet 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 purposes, IP spoofing protection is used in the shared subnet.

A public shared IP address does not allow you to:

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

To change the IP address on a 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). Dedicated subnet IP addresses can be used on account servers located in the same pool. To get a public dedicated IP address, add additional public IP addresses.

Add additional public IP addresses

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

  1. Order a dedicated subnet.
  2. Add the IP address to the accounting system.
  3. Change 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 for which the subnet will be used.
  6. Select the region and pool where the subnet will be created. The subnet will only be available to resources in this pool. You cannot move a subnet to another pool.
  7. Select a VLAN.
  8. Specify the purpose of use.
  9. Select a billing period.
  10. Click Pay. When the service is ready for use, you will receive a notification in a ticket.

2. Add a public IP address to the accounting system

In the accounting system, you can record which IP address is configured on your server. This does not change the network settings on the server; you must change them 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 → Network tab.
  3. In the Public block, click Add IP address.
  4. Select a subnet.
  5. Select an IP address.
  6. Click .

3. Change 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 → Public subnets tab → dedicated subnet card.

Apply the network settings. Availability on the server will be lost until the VLAN on the port is changed.

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 → 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 the dedicated subnet in step 7.
  5. Click Configure. Access to the server will be restored with the new IPv4.

Switch back to a public shared 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 → 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 network interface on 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 → Subnet tab → dedicated subnet card.