DDoS-Guard Protection

Last update: September 25 2026Open in Markdown

DDoS-Guard protection is a solution based on a partner product from the DDoS-Guard company. The following services are available:

• DDoS-Guard L3-L4 protection — operates at the network (L3) and transport (L4) layers. It protects against DDoS attacks that exploit TCP/IP protocol vulnerabilities and are aimed at exhausting bandwidth and disrupting network infrastructure;

• DDoS-Guard website protection and acceleration — operates at the application (L7) layer. It allows for blocking attacks on web applications and websites, and accelerates applications or websites using CDN and load balancing. The service can be connected in combination with the DDoS-Guard L3-L4 protection service or separately.

DDoS-Guard L3-L4 Protection

How it works

For your information

The service protects only IP addresses assigned to equipment in the Selectel infrastructure. The service can only be connected for addresses from a public dedicated subnet or a public subnet. Connection is not available for addresses from a shared subnet (/32) or public IP addresses.

You receive a protected public IPv4 address and use it to configure traffic reception on your server. The address must be assigned to the public network interface as an additional one.

By default, one protected IP address is provided with the service. If you need to protect several servers in a pool, you must order additional protected IP addresses for them.

Incoming traffic directed to the protected address passes through filtering nodes in different parts of the world, where it is analyzed and cleaned. Every incoming packet is filtered. The cleaned traffic is directed to the server's primary address.

Pricing

The service cost consists of:

• from the selected DDoS-Guard L3-L4 Protection plan with the required throughput — 10, 20, 50, or 100 Mbps;
• cost of additional protected IPv4 addresses. The first protected address is provided free of charge; for each additional server in the pool, you must order an additional protected address;
• the cost of a new subnet, if it is required to connect the service.

You can view the DDoS-Guard L3-L4 Protection service plan prices on selectel.ru.

The service is billed monthly; when ordering the service, the payment for the first month is deducted from the balance, and subsequent payments are deducted automatically at the beginning of each following period.

Depending on the type of balance in your account, a unified balance or master balance is used to pay for the service.

Before enabling the service, top up your balance.

Enable the service

1. If your server only has a public shared address or a public IP address, or if your servers are already under attack, order and configure a new subnet.
2. Order the DDoS-Guard L3-L4 protection service.
3. If you need to protect more than one server in a pool, order additional protected IP addresses.
4. Configure the protected IP address on the server.
5. If you are enabling protection for a cloud server, add the protected IP address as an allowed IP address on the port.

1. Order and configure a new subnet

A new subnet is required if:

• your server only has a public shared address (/32);
• or your servers are under attack and the target IP address is already known to attackers.

Order a subnet and configure an address from it on the server:

• for a dedicated server, use the Connect additional public IP addresses⁠ section of the Dedicated server public networks and subnets instructions;
• for a cloud server, use the Configure internet access and access from the internet via a public subnet section of the Configure internet access and access from the internet instructions.

2. Order the service

If you need to protect equipment in different pools, enable a separate protection service for each pool.

1. In the Control panel, from the top menu, click Products and select DDoS protection.

2. Go to DDoS protection.

3. Click Order services.

4. In the row of the DDoS-Guard DDoS protection (L3-L4) service with the required bandwidth (10, 20, 50, 100 Mbps), click Pay.

5. Check the details and click Pay for service.

6. We will create a ticket to enable the service.

7. In this ticket, send us:

   • IP address to be protected;
   • the email for registration in the DDoS-Guard control panel. Credentials for the control panel will be sent to this email.

8. We will notify you about the connection in the ticket.

3. Order additional protected IP addresses

One protected IP address is provided with the protection service. If you need to protect more than one server in a pool, order an additional protected address for each of them.

1. In the Control panel, from the top menu, click Products and select DDoS protection.
2. Go to DDoS protection.
3. Click Order services.
4. In the row of the DDoS-Guard DDoS protection (L3-L4) — additional IP address service, click Pay.
5. Click Pay for service.

4. Configure the protected IP address on the server

Ubuntu

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

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

   vi /etc/netplan/50-cloud-init.yaml

   or

   vi /etc/netplan/01-netcfg.yaml

3. Append the additional address details to the end of the file:

   <eth_name>:0:
       addresses: [<ip_address>/32]

   Specify:

   • <eth_name> — name of the network interface to which you need to add an additional address;
   • <ip_address> — protected IP address received in the ticket.

4. Press ESC.

5. Exit the vi text editor and save your changes:

   :wq

6. Apply the configuration:

   netplan apply

7. Optional: reboot the server.

8. Set all server applications to work with the protected IP address.

Debian

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

2. Open the network interfaces configuration file in the text editor vi:

   vi /etc/network/interfaces/

3. Append the address details to the end of the content:

   auto <eth_name>:0
   iface <eth_name>:0 inet static
   address <ip_address>/32
   mtu 1500

   Specify:

   • <eth_name> — name of the network interface to which you need to add an additional address;
   • <ip_address> — protected IP address received in the ticket.

4. Press ESC.

5. Exit the vi text editor and save your changes:

   :wq

6. Restart the network:

   service networking restart

7. Optional: reboot the server.

8. Set all server applications to work with the protected IP address.

CentOS

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

2. Output information about the network interfaces:

   ip address

3. Open the network interface configuration file in the text editor vi:

   vi /etc/sysconfig/network-scripts/ifcfg-<eth_name>:0

   Specify <eth_name> — the name of the network interface to which you need to add an additional address.

4. Add the additional address details to the file:

   DEVICE=<eth_name>:0
   ONBOOT=yes
   BOOTPROTO=static
   IPADDR=<ip_address>
   NETMASK=255.255.255.255

   Specify:

   • <eth_name> — name of the network interface to which you need to add an additional address;
   • <ip_address> — protected IP address received in the ticket.

5. Press ESC.

6. Exit the vi text editor and save your changes:

   :wq

7. Restart the network:

   service network restart

8. Set all server applications to work with the protected IP address.

Windows

1. Connect to the server via RDP or via the KVM console.
2. Go to Ethernet settings → Change adapter settings.
3. Open the connection settings and right-click the required device.
4. Select Properties → in the list, double-click Internet Protocol Version 4 (TCP/IPv4).
5. Make sure you have selected Use the following IP address.
6. Click Advanced.
7. Click Add.
8. In the IP address field, enter the protected IP address received in the ticket.
9. Click Add.
10. Click OK.
11. Set all server applications to work with the protected IP address.

5. Add the protected IP address as an allowed IP address on the cloud server port

If you are enabling protection for a cloud server and its public subnet has traffic filtering (port security) enabled, add the protected address as an allowed IP address on the port on which you configured the protected address.

1. Check the traffic filtering (port security) status on the server network:

   1.1. In the Control panel, from the top menu, click Products and select Cloud Servers.

   1.2. Go to the Network section → the Public networks.

   1.3. Check the card of the public subnet from which you configured the IP address on the server. If the subnet is marked with , traffic filtering (port security) is enabled on the network.

2. If traffic filtering is disabled in the subnet, no additional configuration is required. If filtering is enabled, add the protected IP address as an allowed IP address to the cloud server port:

   Control panel

   2.1. In the Control panel, from the top menu, click Products and select Cloud Servers.

   2.2. Open the server page → tab Ports.

   2.3. In the row of the port to which you assigned the protected address, in the Security groups field, click .

   2.4. Click Add IP/MAC pair.

   2.5. Enter the protected IP address that you received in the ticket.

   2.6. Enter the MAC address corresponding to the IP address, or leave the default MAC address of the port. Do not use addresses from the range 00:00:5e:00:01:82 – 00:00:5e:00:01:c6. These MAC addresses are reserved by Selectel network equipment; using them will block traffic on the cloud server interface.

   2.7. Click Save.

   OpenStack CLI

   2.1. Open the OpenStack CLI.

   2.2. Add the allowed address:

   openstack port set \
     --allowed-address ip-address=<ip_address>[,mac-address=<mac_address>] \
     <port>

   Specify:

   • <ip_address> — protected IP address received in the ticket;
   • optional: ,mac-address=<mac_address> — MAC address corresponding to the IP address. The <mac_address> parameter is the value of the MAC address. Do not use addresses from the range 00:00:5e:00:01:82 – 00:00:5e:00:01:c6. These MAC addresses are reserved by Selectel network equipment; using them will block traffic on the cloud server interface. If you do not specify a MAC address, the primary MAC address of the port will be used;
   • <port> — ID of the port to which you assigned the protected IP address. You can view the list of ports using the command openstack port list.

View statistics

1. Go to the DDoS-Guard client area. The login credentials can be found in the ticket on enabling the service.
2. Open the IP transit tab. This displays statistics on total traffic before filter scrubbing. The graphs are built based on five-minute traffic measurements, so peaks may be smoothed out.

Disable the service

1. Ensure that you have reconfigured traffic reception to an address from your subnet. The protected address you received when ordering the service will be disabled along with the protection.

2. In the Control panel, from the top menu, click Products and select DDoS protection.

3. Go to DDoS protection.

4. In the service menu, select Disable monthly payment. The service will continue to work until the end of the paid period.

5. We will deactivate the service after the end of the paid period.

DDoS-Guard Website Protection and Acceleration

How it works

After ordering the service, you receive a protected address to which you must redirect your traffic. All traffic to the protected address is sent to DDoS-Guard filtering nodes, where it is analyzed and cleaned, and then redirected to the protected server in the Selectel infrastructure.

The protection works with HTTP and HTTPS requests only on ports 80 and 443; requests to other ports are not processed.

Connecting the service will not protect against a DDoS attack if attackers know the target IP address. Before connecting, it is necessary to remove mentions of all IP addresses you want to protect from external resources. If the IP addresses are already under attack, you must order a new subnet and configure it on your servers.

Pricing

The following plans are available for ordering the service: Normal, Medium, Premium, and Enterprise. Their main differences are:

• number of protected domains;
• number of servers for load balancing;
• the number of rules for restricting access by IP address. For any plan, you can purchase an additional rule package via a ticket;
• possibility of flexible filtering rule configuration.

The filtering bandwidth and traffic volume, including legitimate traffic, are unlimited.

You can view a detailed comparison of plans and their pricing on selectel.ru.

The service is billed monthly; when ordering the service, the payment for the first month is deducted from the balance, and subsequent payments are deducted automatically at the beginning of each following period.

Depending on the balance type in your account, the service is paid using the unified balance or the primary balance.

Before enabling the service, top up your balance.

Enable the service

The minimum setup time is 1–2 days. If you need protection urgently, create a ticket and specify the domain and IP address to be protected, as well as the email for registration in the DDoS-Guard client area. After creating the ticket, call us.

1. If the domain's IP address is already known to attackers, order and configure a new subnet.
2. Order the DDoS-Guard Website Protection and Acceleration service.
3. Specify the protected address in the domain's A record.
4. Optional: restrict connections to the server from IP addresses.
5. Optional: configure additional protection.

1. Order and configure a new subnet

A new subnet is required if your servers are under attack and the target IP address is already known to attackers.

Order a subnet and configure an address from it on the server:

• for a dedicated server, use the Connect additional public IP addresses⁠ section of the Dedicated server public networks and subnets instructions;
• for a cloud server, use the Create a public subnet section of the Public subnets instructions.

2. Order the service

1. In the Control panel, from the top menu, click Products and select DDoS protection.

2. Go to DDoS protection.

3. Click Order services.

4. In the row of the required plan DDoS-Guard. Website protection and acceleration (Normal, Medium, Premium, Enterprise), click Pay.

5. Check the details and click Pay for service.

6. We will create a ticket to enable the service and clarify the activation date.

7. In this ticket, send us:

   • the domain to be protected;
   • Domain IP address. You can specify multiple IP addresses if they point to the same domain and load balancing between them is required;
   • the email for registration in the DDoS-Guard control panel.

8. We will notify you when the service is connected.

3. Specify the protected IP address in the domain A record

1. Go to the DDoS-Guard client area.
2. Enter the login and password received by email when ordering the service.
3. Open the service page Website Protection and Acceleration.
4. Open the tab Domains.
5. Save the protected IP address specified in the Protected IP field.
6. Go to the control panel of the domain registrar where your domain records are stored.
7. In the domain A record, change the value to the protected IP address you copied in step 5. Do not change the A record value intended for mail server or FTP server traffic.
8. If AAAA records are specified for the domain, delete them. DDoS-Guard does not work with IPv6 addresses; they can be attacked bypassing protection.
9. If you want to protect subdomains, add an A record with the protected IP address for each of them. You can protect an unlimited number of subdomains.

4. Optional: restrict connection to the server by IP addresses

You can restrict connections to the server from all IP addresses except DDoS-Guard trusted IP addresses. For more details on the setup, see the Firewall setup section of the L7 protection configuration instructions in the DDoS-Guard documentation.

5. Optional: configure additional protection

You can configure additional protection in the DDoS-Guard client area. For example, you can set up traffic filtering rules, enable geoblocking, or configure other options. For the full list of options, see the Website protection section of the DDoS-Guard documentation.

To configure additional protection:

1. Log in to the client area. To log in, use the login and password received by email when ordering the service.
2. Complete the setup following the relevant instructions in the Website protection section of the DDoS-Guard documentation.

View statistics

1. Go to the client area. To log in, use the login and password received by email when ordering the service.
2. View the statistics following the L7 attacks and attack reports instructions in the DDoS-Guard documentation.

Disable the service

1. Ensure that you have reconfigured traffic reception to an address from your subnet. The protected address you received when ordering the service will be disabled along with the protection.
2. Open the control panel of the domain registrar where your domain records are stored.
3. In the domain A record, change the value to an address from your subnet.
4. In the Control panel, from the top menu, click Products and select DDoS protection.
5. Go to DDoS protection.
6. In the service menu, select Disable monthly payment. The service will work until the end of the paid period.
7. We will deactivate the service after the end of the paid period.