SPN Concept

SNC Connectivity - SPN Concept

Last updated 18th November, 2021


Discover the details on how to implement subnets with SPN.



A subnet is the smallest network object. It defines a layer-2/ethernet segment with an IPv4 prefix. It's not extendable to other SecNumCloud zones or with vRack.

SecNumCloud products are attached to subnets : they will share the same ethernet segment and the same IPv4 prefix.

The IPv4 prefix matches the following rules:

  • minimum size: /28
  • maximum size: /24
  • the 3 first IP are reserved for OVHcloud: the first one for VIP, the two others for OVHcloud routers
  • no vlan tag

A subnet can also be configured for a static route using the optional next-hop field: next-hop is the IP address of the next-hop to reach the subnet (i.e the next-hop is acting as a router, like a firewall).
Next-hop must be part of another subnet.
Subnet for static routing are limited in size (i.e not limited to /24).

SPN - SecurePrivateNetwork

SPN is the container for subnets acting like a (unique) routing instance.

Attaching subnets to SPN depends on two rules:

  • an SPN can be attached to several subnets
  • a subnet can be attached to only one SPN

SPN subnet rules

Behavior using next-hop feature:

next-hop feature

Go further

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