To use the functions explained in this guide you must have a Virtual Rack.

You must:

• Have a Virtual Rack (vrack)
• Have a dedicated servers which us EG, MG or HG (1Gb/s) with the option for professional use.
• Be able to connect via SSH (for Linux servers)

Virtual Rack brings together several virtual servers (whatever their number and physical location in our data centres) and connect to a virtual switch within the same private network. Your servers can communicate privately and securely between them (in a dedicated VLAN).


Order professional use on the servers:

• If you do not have a professional server, visit the OVH Manager and click on the server that requires it to order it.

Order Virtual Rack:

• To order your virtual rack visit the Manager v3. On the homepage, select one of your servers range EG, HG or MG. Go to the section and click . Simply select the servers you want to add to your infrastructure and validate your order.

Once your virtual rack is installed you will receive a confirmation email containing the number of your vrack and useful information.


Above all we recommend you install the following packages as it will be useful for configuration and diagnostics in case of problems:

• vlan and vconfig Mandatory to configure your vrack
• tcpdump To listen NICs
• netcat For testing transfers between two servers for example
• fping Will be useful to ping a range of IPs
• netmask Which will allow to see the number of available IPs

Info ! Throughout this guide, eth0.XXXX corresponds to tag your vrack Example for vrack 2009 eth0.XXXX = eth0.2009. In all the examples below where we configure our vrack with IP 10.0.0.1 and this on two machines: testvrack1 (10.0.0.1) and testvrack2 (10.0.0.2).

IMPORTANT !! You can set 10.0.0.0 / 8 with the exception of IP listed below, you must add IN ANY CASE following IP as the interface on your machine: 10.0.0.0 => IP Network 10.255.255.252 => IP reserved for internal use OVH 10.255.255.253 => IP reserved for internal use OVH 10.255.255.254 => IP Gateway your vrack

Info! But how many IPs are in a /16? Netmask can help you see the number of IPs. In ssh, connected to your server type: netmask -r 10.0.0.0/8 and you'll get: 10.0.0.0-10.255.255.255 (16777216) You can use IP 16777216 IP except those listed above. As a good administrator is 10.0.0.0 and we begin to stop at 10255255250

IMPORTANT !! You can set 10.0.0.0/8 with the exception of IPs listed below, you must add IN ANY CASE following IP as the interface on your machine: 10.0.0.0 => IP Network 10.255.255.252 => IP reserved for internal use OVH 10.255.255.253 => IP reserved for internal use OVH 10.255.255.254 => IP Gateway your vrack

Install the packages mentioned above:

Edit the network configuration file /etc/network/interfaces and add this by replacing XXXX with the tag of your vrack:

Then restart your network interface:

To check your configuration:

To test your configuration, you can ping the gateway or another server of your vrack where you have already performed the operations described above:

IMPORTANT !! You can set 10.0.0.0/8 IP except if listed below, you must add IN ANY CASE following IP as an interface on your machine: 10.0.0.0 => IP Network 10.255.255.252 => IP reserved for internal use OVH 10.255.255.253 => IP reserved for internal use OVH 10.255.255.254 => IP Gateway your vrack

Install the packages mentioned above:

Edit the network configuration file /etc/conf.d/net and add this by replacing XXXX with the tag of your vrack:

Then restart your network interface:

To check your configuration:

To test your configuration, you can ping the gateway or another server of your virtual bay where you have already performed the operations described above:

IMPORTANT !! You can set 10.0.0.0 / 8 with the exception of IP listed below, you must add IN ANY CASE following IP as the interface on your machine: 10.0.0.0 => IP Network 10.255.255.252 => IP reserved for internal OVH use 10.255.255.253 => IP reserved for internal OVH use 10.255.255.254 => IP Gateway of your vrack

Install the packages mentioned above, netcat is already installed(nc):

To install fping:

To install whatmask:

We copy the network configuration file and we add the tag of vrack:

We then edit the file:

Next, install your network interface:

To check your configuration:

To test your configuration, you can ping the gateway or another server of your virtual bay where you have already performed the operations described above:





Being drafted.

Being drafted.


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Being drafted.

• Your IP is private in ifconfig? If not, check the file /etc/network/interfaces
• The IP is private but not on the vrack:Have you filled out the tag of vrack in the interfaces file?
• The gateway does not ping:Is the server really in the vrack? Have you configured the right gateway? Have you configured a firewall blocking the requests?
• To verify what IPs are addable in your block:

• For flow between your servers:

In the server to test :

In the other server :

• The gateway pings, but not the other servers:

(Section in progress)

In addition to the standard use of your virtual rack you can also:

• Use an IP block in your vrack RIPE
• Cisco Loadbalancing: click to view the guide Cisco ACE (Beta version)

Additional sections being drafted