Proxmox 4, CentOS 7 LXC with IPs from multiple subnets

[SPQRInc]

Hello,

If I add IP-addresses to my CentOS-7-LXC I can only do that if this IP is from the same subnet. If I'm using another subnet with another gateway the container is not pingable anymore - I have to remove the IP from the other subnet and reboot the container after that.

The interfaces-configuration of the host node is:

auto lo

iface lo inet loopback


auto vmbr0

iface vmbr0 inet static

    address 84.xxx.xxx.x4

    netmask 255.255.255.240

    gateway 84.xxx.xxx.x1

    bridge_ports eth0

    bridge_stp off

    bridge_fd 0

Any ideas?

 

[SPQRInc]

Hello,

I got some more details:

The problem is not related to CentOS7 - it appears with Debian, too.

And: If I add an IP from subnet 1 with gateway 1 everything is fine. If I add the second IP from subnet 2 with gateway 2 the container can not handle incoming or outgoing connections.


Example:

84.xxx.xx1.x4 with gateway 84.xxx.xx1.x1 -> everything is fine

if I add

84.xxx.xx1.x6 with gateway 84.xxx.xx1.x1 -> everything is fine

if I add

84.xxx.xx2.x4 with gateway 84.xxx.xx2.x1 -> all IPs of the container are not responding to incoming PING. Outgoing PING does not work, too.