Create and configure a reserved IP address

A reserved IP is a dedicated address that can be assigned to a Virtual Machine, Bare Metal server, or Load Balancer. It exists independently of resources, can be pre-configured in DNS or firewall rules, and remains valid when reassigned. A reserved IP can also be used as a Virtual IP address.

Overview

After a reserved IP is created, this address is exclusively allocated within the Gcore system. No other account can use it. The IP can be assigned to a resource or kept unassigned for future use. An existing port attached to a Virtual Machine or Load Balancer can also be marked as reserved to protect it from deletion.

Billing

The monthly price for the IP is displayed in the order window. Billing applies only for the time from creating an IP to deleting it.

If an IP is reserved and deleted after an hour, charges apply only for that hour. The price remains the same whether the IP is assigned or not.

Reserve an IP address

To create a new reserved IP:

1. In the Gcore Customer Portal, navigate to Cloud > Networking.

2. Open the Reserved IPs page.

A project can have up to 1000 reserved fixed IP addresses that are not attached to any resource.

3. Click Reserve new IP.

4. In the Network field, select the network type:

• Public: External network for internet-facing IP addresses.
• Private: Internal network within the project. For this option, select the network and optionally a specific subnetwork.
• Dedicated public: Dedicated public network (if configured for the project).

When a network is selected without specifying a subnetwork, the IP address is allocated in any available subnet of that network.

A reserved private IP works within the specified subnetwork. To request a specific address, in the IP address to reserve section, select Custom and enter the IP that belongs to that subnetwork.

5. (Optional) In the IP Family section, select the IP version: IPv4, IPv6, or Dual (IPv4 + IPv6).

6. Click Reserve IP.

Assign a reserved IP to a VM

During VM creation

Refer to the VM creation guide.

After VM creation

1. In the Virtual Machine settings, open the Networking tab.

If the machine is already connected to the target subnetwork, detach it first before assigning a new IP. This removes the existing IP from the interface.

2. Add a new interface (public or private) and enable the Use reserved IP toggle.

3. Select the reserved IP and click Add.

The IP will be assigned to the Virtual Machine.

Configure the network interface in the operating system

Manual configuration is required only when adding a private interface to an existing VM or Bare Metal server.

Find the interface name, IP address, and CIDR in the Networking tab. The gateway is the first usable IP in the subnet (10.10.0.1 for 10.10.0.0/24).

To identify the new interface, run ip link show and match the MAC address shown in the portal.

Linux

Temporary DHCP

If the network has DHCP enabled, request an IP address automatically:

sudo dhcpcd <interface_name>

Example:

sudo dhcpcd enp4s0

This configuration is lost after a reboot.

Temporary static

Assign a static IP address manually:

sudo ip link set <interface_name> up
sudo ip addr add <ip_address>/<prefix> dev <interface_name>
sudo ip route add <subnet_cidr> via <gateway_ip> dev <interface_name>

Example:

sudo ip link set enp4s0 up
sudo ip addr add 172.18.220.100/22 dev enp4s0

This configuration is lost after a reboot.

Persistent DHCP

For Ubuntu 24.04 and other Netplan-based distributions, create a configuration file:

sudo bash -c 'cat <<EOF > /etc/netplan/51-new-interface.yaml
network:
  version: 2
  ethernets:
    enp4s0:
      dhcp4: true
EOF'

Apply the configuration:

sudo netplan apply

Persistent static

For Ubuntu 24.04 and other Netplan-based distributions, create a configuration file:

sudo bash -c 'cat <<EOF > /etc/netplan/51-new-interface.yaml
network:
  version: 2
  ethernets:
    enp4s0:
      dhcp4: false
      addresses:
        - 192.168.1.10/24
      gateway4: 192.168.1.1
      nameservers:
        addresses:
          - 95.85.95.85
          - 2.56.220.2
EOF'

Replace enp4s0, IP address, gateway, and nameservers with the actual values.

Apply the configuration:

sudo netplan apply

Windows

1. Open Control Panel > Network and Sharing Center > Change adapter settings.

2. Right-click the new network adapter and select Properties.

3. Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.

4. Select Use the following IP address and enter the IP address, subnet mask, and default gateway.

5. Click OK to save the settings.

The Virtual IP (VIP) address configuration guide contains additional configuration examples.

Detach a reserved IP from a VM

Detaching is required before reassigning the IP to another resource or deleting it.

1. Open the Virtual Machine settings.
2. Go to the Networking tab.
3. Expand the interface that contains the reserved IP.
4. Click the three-dot menu next to the subnetwork row.
5. Select Detach Subnetwork.

Assign a reserved IP to a load balancer

Reserved IP assignment is available during Load Balancer creation.

The IP becomes the frontend address and is tightly bound to the frontend network interface. It cannot be changed after provisioning.

For instructions, refer to the Load Balancer creation guide.

Find a resource with reserved IP

The Status column on the Reserved IPs page shows if an IP is attached to a resource:

Click the resource name to view and update its settings.

Delete a reserved IP

After verifying that the IP is no longer attached to any resource, it can be deleted:

1. In the Gcore Customer Portal, navigate to Cloud > Networking.

2. Open the Reserved IPs page.
3. Click the three-dot icon next to the target IP.
4. Select Delete.