I have Proxmox 5.2 server in OVH. I have few LXC containers and everything work just fine except when I add a second IP to the container it doesn't work - inside in the container the interface exists and I can ping it from inside. On the other hand from outside it's unreachable. I checked few of the IP's and everyone of them work perfectly well if alone in the container. The MAC addresses are OVH type.
Ah, and it was working in Proxmox 4.2 before I upgraded it to Proxmox 5... Of course I was trying this with old containers and also with freshly made ones - no difference.
Any idea what's wrong?