Second (and not only) IP on Centos 7 VM (KVM) machine

[nekys]

I attempt to assign secondary IP address on a CentOS 7 KVM VM. My node is on OVH. I already added an IP (virtual mac etc) on the CentOS 7 VM and it's working fine.
I attempted to replicate the same procedure, assign an extra IP but I can't ping it from the outside.
Is there a limitation? I mean, can I assign more than 1 IP on a VM?
Is there a problem with CentOS?
Is there any special procedure for routing? It looks like routing issue.

 

[Faris Raouf]

Well, on a conventional setup, you just add the IP and it just works. I have Centos 7 VMs with up to 10 IPs. Nothing is done in Proxmox, all in Centos itself.

Have you done anything unusual with a firewall, either at OVH or in Proxmox? Does OVH require you to do something unusual to get additional IPs to work? I seem to recall that OVH had an usual networking setup - but I'm afraid I don't recall more than that. It could be this that's getting in the way.