Proxmox private network between KVM and VZ

configurationnetworkingproxmox

Sorry for asking this eventually trivial question, but I'm fighting with this for more than a day, and was unable to figure this out by myself so far.

Situation

Proxmox host running a bunch of openvz-nodes.
Each node has a public IP from a /28 subnet, and an internal IP for node<>node & node<>host networking. This is all working perfectly so far.

Now I have to add a KVM-based Windows instance, which should should be accessible from the internal network. I'm looking for advice on how the network-settings should be configured (host & KVM)

Currently /etc/network/interfaces contains:

# loopback
auto lo
iface lo inet loopback

# eth0
auto  eth0
iface eth0 inet static
  address       xxx.xxx.77.119
  broadcast     xxx.xxx.77.127
  netmask       255.255.255.255
  gateway       xxx.xxx.77.97
  pointopoint   xxx.xxx.77.97

# default route subnet access
up route add -net xxx.xxx.77.96 netmask 255.255.255.224 gw xxx.xxx.77.97 eth0

The internal IPs have been assigned through Proxmox / vzctl, in the 10.0.0.0/24 subnet:

  • nde01 > 10.0.0.1
  • nde02 > 10.0.0.2
  • etc

In my case the KVM instance in question is node12, so it should have the IP 10.0.0.12. And it should be able to communicate with the other nodes & host.
As far as I know the solution would be to ad a bridge e.g. vmbr0 on the host, but how should this exactly be configured? And what are the corresponding settings for the KVM node.

I did try with dozens of combinations, but never got it working…

The network interface in the KVM node itself seems to be installed properly, did use the virtio drivers and it is looking fine. (The interface itself, not the TCP/IP configuration)

Any help would be very appreciated!

A bonus-answer would be how to let the KVM instance access the internet through NAT. But I'd bee extremely happy already with internal networking!

Best Answer

on proxmox one can use dummy interface to make a vlan between VM or container or whatever. it will not get out of the server as there is not physical link for.

just put in your /etc/network/interface something like 

auto vmbr2
iface vmbr2 inet manual
    bridge_ports dummy0
    bridge_stp off
    bridge_fd 0
    pre-up modprobe dummy numdummies=4

and use vmbr2 for your internal only needs for all the nodes that need internal network only. by the way, it will be persistent over reboot...

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