Last updated 24/08/2018
This guide will show you how to configure a block of public IP addresses for use with the vRack.
- a public block of IP addresses in your account, with a minimum of four addresses
- your chosen private IP address range
- a vRack compatible server
- a vRack service activated in your account
- access to the OVH Control Panel
For example purposes we'll be using an IP block of 18.104.22.168/28 and eth1 for the secondary network interface, which is dedicated to the vRack.
Configure a usable IP address
For vRack purposes, the first, penultimate, and last addresses in any given IP block are always reserved for the network address, network gateway, and network broadcast respectively. This means that the first useable address is the second address in the block, as shown below:
22.214.171.124 Reserved: Network address 126.96.36.199 First usable IP 188.8.131.52 184.108.40.206 220.127.116.11 18.104.22.168 22.214.171.124 126.96.36.199 188.8.131.52 184.108.40.206 220.127.116.11 18.104.22.168 22.214.171.124 126.96.36.199 Last usable IP 188.8.131.52 Reserved: Network gateway 184.108.40.206 Reserved: Network broadcast
To configure the first usable IP address, we need to edit the network configuration file, as shown below. In this example, we need to use a subnet mask of 255.255.255.240.
The subnet mask we've used in our example is appropriate for our IP block. Your subnet mask may differ depending on the size of your block. When you purchase your IP block, you'll receive an email that will tell you which subnet mask to use.
/etc/network/interfaces auto eth1 iface eth1 inet static address 220.127.116.11 netmask 255.255.255.240 broadcast 18.104.22.168
Create a new IP routing table
First, we need to download and install iproute2, which is a package that will enable us to manually configure IP routing on the server.
Establish an SSH connection to your server and run the following command from the command line. This will download and install iproute2.
# apt-get install iproute2
Next, we need to create a new IP route for the vRack. We'll be adding a new traffic rule by amending the file, as shown below:
/etc/iproute2/rt_tables # # reserved values # 255 local 254 main 253 default 0 unspec # # local # #1 inr.ruhep 1 vrack
Amend the network configuration file
For example purposes, the network configuration file we refer to is located in /etc/network/interfaces. The equivalent file on your server may be located somewhere else, depending on your operating system.
Finally, we need to amend the network configuration file to account for the new traffic rule and route the vRack traffic through the network gateway address of 22.214.171.124.
/etc/network/interfaces auto eth1 iface eth1 inet static address 126.96.36.199 netmask 255.255.255.240 broadcast 188.8.131.52 post-up ip route add 184.108.40.206/28 dev eth1 table vrack post-up ip route add default via 220.127.116.11 dev eth1 table vrack post-up ip rule add from 18.104.22.168/28 table vrack post-up ip rule add to 22.214.171.124/28 table vrack
Now reboot your server to apply the changes.
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