public cloud  private network

A flexible, private connection between your instances

The emergence of software-defined networks (SDNs) in cloud infrastructures has given users increased flexibility when it comes to network management. In this spirit, the OVHcloud Public Cloud lets you design and build your network architecture on demand. By creating private networks, you implement virtual switches to connect your running project instances in real time, without any service interruptions.

Extended networks between regions

Public Cloud Private Networks are built on OVHcloud vRack technology. You can use it to extend private networks between OVHcloud datacentres, connecting instances across different regions around the world through private communication channels.


You can create up to 4,000 level 2 private networks. In concrete terms, launching a Private Network implements a new VLAN, whose communications are only accessible to the resources connected to it. This isolation can be used to segment control plane and data plane networks, for example.

Extension to other OVHcloud services

You can also use the vRack to connect different OVHcloud services to one another. For example, you can use your Private Network to connect your Public Cloud to Private Cloud or dedicated servers. This means you can create the hybrid infrastructures you need, while keeping your connections private. 

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ISO/IEC 27001, 27701 and health data hosting compliance

Our cloud infrastructures and services are ISO/IEC 27001, 27017, 27018 and 27701 certified. These certifications ensure the presence of an information security management system (ISMS) for managing risks, vulnerabilities and implementing business continuity, as well as a privacy information management system (PIMS). Thanks to our health data hosting compliance, you can also host healthcare data securely.

Use cases

Multi-region disaster recovery plans (DRP)

As the Public Cloud is available in several OVH datacentres, by setting up a disaster recovery plan, your services will benefit from a private network’s capacity to expand into other regions. This way, you can sync your data via a secure channel to organise a simple, efficient DRP.

Terraform deployment industrialisation

Terraform's OpenStack driver is used to manage the OVH Public Cloud's Private Networks. If you are looking to deploy complex infrastructures that are difficult to industrialise, you can do so with resources like networks, subnets and ports via this Infrastructure-as-Code (IaC) tool.

Load balancing between locations

A distributed application can be deployed across multiple locations, without sacrificing the security and reliability of collaborative communications between nodes. This way, data from the same application or cluster can move between locations, with quick response times and full isolation.

How to

Create a Private Network

openstack network create net01

Create a subnet with DHCP

openstack subnet create subnet01 --network net01 --subnet-range




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DHCP servers

When you create a network, you can choose to use addressing via DHCP. If you choose this option, a DHCP server will be launched on the network to serve your settings.

DNS integration

The DHCP configuration can include the definition of the DNS servers that should serve your network. This way, you can point to the DNS server of your choice.

Range definition

DHCP servers can serve a specific CIDR configuration, targeting only a part of the IP address range you have chosen.

Fixed or dynamic addresses

You can choose specific addresses in the network range for a port or instance. You will always need to configure this via DHCP, but you will retain control over the addressing plan by doing so.

Unattached ports

Private networks' ports are independent of their instances, so you can detach a port from an instance without losing it. This can be useful for projects that involve infrastructure orchestration.

Pricing Public Cloud

Private Network billing

Private Networks and their traffic are both free of charge.

Your questions answered

How many private networks can I create?

The technical limit is 4,000 private networks, but you may find that there is a quota limit for your project. You can request a quota increase via the OVHcloud Control Panel.

Can I manage addressing manually, or any way other than DHCP?

If you want to manage addressing differently, you can do this as you would with any other layer 2 network.

Can I connect my Public Cloud instances to the same private network as my dedicated server or Hosted Private Cloud?

Yes, all OVHcloud private networks are managed by our vRack technology. This means you can extend private networks between different services. Simply attach the same vRack to each of the solutions.

Can I connect two instances located on each side of the Atlantic via a Private Network, or any other location?

Yes. Once your project is connected to a vRack, all active locations can communicate with each other. Simply use the same VLAN number when creating private networks in each region.

What is the average latency between datacentres via a Private Network?

As an indication, here are some average measures. These values may change over time:

  • Europe - Europe
    • Strasbourg - Gravelines: 12 ms
    • Strasbourg - Frankfurt: 4 ms
    • Strasbourg - Wrocław: 24 ms
    • Strasbourg - London: 15 ms
    • London - Wrocław: 31 ms
  • Europe - North America
    • London - Beauharnois: 77 ms
    • Wrocław - Beauharnois: 111 ms
    • Strasbourg - Beauharnois: 91 ms
  • Europe - Asia-Pacific
    • Strasbourg - Singapore: 148 ms
    • Strasbourg - Sydney: 288 ms
  • Asia-Pacific - Asia-Pacific
    • Sydney - Singapore: 149 ms
  • Asia-Pacific - North America
    • Singapore - Beauharnois: 234 ms
    • Sydney - Beauharnois: 204 ms

By default, do instances automatically configure the address provided by DHCP?

Standard system images generally offer automatic configuration by DHCP on the instance’s first network interface. To configure additional interfaces, you will need to add them to the instance’s startup script, for example.