Public networks and subnets of the dedicated server

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

The server is automatically included in the shared VLAN for the public network and is allocated one IPv4 public address from the 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 → Subnet tab → Subnet page.

To obtain additional IP addresses , order a dedicated subnet and configure it. When ordering a dedicated subnet, IP addresses will be allocated to an account on a separate VLAN. No more than one dedicated VLAN for a public network in the same pool is allocated per account.

Dedicated subnet IP addresses can be used on account servers that are in the same pool (IP addresses work only within the same pool). When ordering a dedicated subnet, you can use either an address from a shared subnet or a dedicated subnet. You cannot use both IP addresses at the same time.

You can view the VLAN that is assigned to a port in the Control Panel: from the top menu, click Products → Dedicated Servers → Servers → Server → Server page → Ports tab.

The network interface on the server will be configured automatically only when the OS is auto-installed. When installing the OS from its own image, you must configure the network interface on the server manually.

When setting up your network, we recommend using Selectel recursive DNS servers, but you can specify any public DNS servers.

All traffic (incoming, outgoing) that passes through the Internet port is summarized and charged according to the traffic consumption model.

Network limits are set on the ports:

for the number of MAC addresses - 25 MAC addresses per switch port;
for broadcast traffic - 10 MB/sec per port for each separate type of traffic.

Dedicated servers are by default protected against Selectel DDoS attacks. A basic firewall can be connected free of charge for a public dedicated VLAN.

You can disconnect a server of arbitrary configuration from the public network by creating a ticket. After disconnection from the public network it will not be possible to install the OS on the server by auto-installation.

Public shared IP addresses

Public shared IP addresses are on a common subnet and have a fixed prefix /24 (mask 255.255.255.0). Servers of other clients are also on the shared subnet, and servers in the same account can fall into different shared subnets. For security, IP address spoofing protection is used in the shared subnet.

A public shared IP address won't allow it:

connect DDoS protection;
configure static or dynamic routing;
unblock blocked ports;
configure BGP and BGP + anycast subnet connection;
use a public dedicated IP address at the same time;
reassign an address to another server (including using VRRP, CARP, Keepalived, Corosync, etc. for server redundancy).

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

Public dedicated IP addresses

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

Connect additional public IP addresses

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

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

1. Order a dedicated subnet

In the Control Panel, on the top menu, click Products and select Dedicated Servers.
Go to the Network section.
Click Order a public subnet.
Select the desired service.
Specify a pool. You cannot move a subnet to another pool.
Specify the purpose of the use.
Select a payment period.
Click Pay. When the service is ready for use, a notification will be sent in the 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. In this case, the network settings on the server will not change, they must be changed manually.

In the Control Panel, on the top menu, click Products and select Dedicated Servers.
In the Servers section, open the Server page → Network tab.
In the Public block, click Add IP Address.
Select a subnet.
Select an IP address.
Save the changes you have made.

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.

You can view the parameter values in the control panel: from the top menu, click Products → Dedicated Servers → Network → Public Subnets tab → Dedicated Subnet Card.

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

4. Switch the VLAN on the server port

In the Control Panel, on the top menu, click Products and select Dedicated Servers.
In the Servers section, open the Server page → Ports tab.
In the Internet field, change the value of Shared to the value of the dedicated VLAN.
Save the changes you have made. Access to the server will be restored with the new IPv4.

Return to a shared public IP address

In the Control Panel, on the top menu, click Products and select Dedicated Servers.
In the Servers section, open the Server page → Ports tab.
In the Internet field, change the value of the allocated VLAN to Shared.
Save the changes you have made.
In the server OS, change the values of the public network interface settings. For more information, see the Configure the network interface on the server instruction. You can view the parameter values for working with a public IP address from a shared subnet (/32) in the control panel: from the top menu, click Products → Dedicated Servers → Network → Subnet tab → Dedicated Subnet card.