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I'm having dedicated server from OVH and I have ordered IP failover. Now I'm wondering is it an additional IP? The reason I ordered it is: I'm running an application which uses port 3900, and I need to run second same application on port 3900 (on that additional IP) also. (changing the port is not a solution)

So will I be able to have one application on first.ip.xxx.xxx:3900 and second application on failover.ip.ibought.xxx:3900? Or I have bought totally different thing?

Summarized: Is IP failover I bought an additional IP for my server?

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You can put both services into a linux container and expose the service on whatever port you want on the host machine. Additional ip addresses are not necessary. –  Eloff Jan 23 at 12:24
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2 Answers

Nope. What you bought is not a second IP. You purchased a mirrored second server that will take over on the same IP address in the event that the first server becomes unreachable.

Here's a good explanation

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Yes, you've chosen right: in OVH, the ip failovers are additional IPs to be used on a virtual network card.
After creating the "new network card" (eth0:0) and assigning an IP, you will be able to serve whatever you want with that ip... on the same port.
You must, before using it and after having completed the configuration, enter their control panel and associate the IP to your dedicated server, making the OVH routers know how to forward that IP.

I did it once, when I had another dedicated and, after asking them how did the additional IPs work in OVH, they told me I can use the failovers, that are completely different from what are for example the elastic IPs on Amazon.
Anyway, more information about it are here: http://help.ovh.co.uk/IpAlias

In the meantime, good luck with your server and your project! ;-)

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What you're linking to is IP Alias, which is not the same as IP Failover. (see help.ovh.co.uk/IpFailover) –  Marcus_33 Jun 28 '12 at 17:54
    
Yes: in your link, under "Install", they show you the installation, that points to help.ovh.co.uk/IpAlias :) –  Alessio Periloso Jun 28 '12 at 17:57
    
Thanks mate you saved me! –  Deda Spale Jun 28 '12 at 18:01
    
No problem! ;-) –  Alessio Periloso Jun 28 '12 at 18:02
    
Weird. Why does the page I link to talk about rocking back and forth between 2 servers and the install page talk about multiple IPs and virtual NICs? –  Marcus_33 Jun 28 '12 at 18:04
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