[one-users] VMs are not reachable over their IP

[Jaime Melis]

Hi Martin,

The way the default network configuration works in OpenNebula is by making
the hypervisor hook the virtual network interface of a virtual machine to a
pre-existent bridge (created by the administrator), which is, in turn,
connected to a real physical device:

  +-------------------+
  |                   |
  |      br0          |
  |                   |
  +---+----------+----+
      |          |
      |          |
+---------+  +-----------+
|         |  |           |
|  eth0   |  |    vnet0  |
|         |  |           |
+---------+  +-----------+

br0: bridge created by administrator during the installation process of
OpenNebula (which may or may not have an IP)
eth0: real physical device (which doesn't have an IP)
vnet0: the virtual network device of the virtual machine, created by the
hypervisor.

You can verify this when running a VM by running the following command in
your worker nodes:

$ bridge name bridge id STP enabled interfaces
br0 8000.001e682f4a02 no eth0
 vnet1

br1 8000.001e682f4a03 no eth1
 vnet0

In this particular case there are two bridges: br0 and br1

You can read about alternative network setups here:
http://opennebula.org/documentation:rel3.0:nm

Regards,
Jaime

On Mon, Nov 14, 2011 at 1:06 PM, Martin Lauer <ml067 at hdm-stuttgart.de>wrote:

> **
> Hi,
> I've set up my machine images with contextualization and they're
> configured right, when looking into the machines via VNC.
> The leases from my "public.net" are also given to the machines.
> Shouldn't the bridge on the host(s) "br0" be mapped with additional IPs
> (the ones from the VMs)? This is just an assumption, when thinking back to
> Eucalyptus, which I tried to use before as a Private Cloud Infrastructure.
>
> Can someone give me a hint how routing is done in OpenNebula and how
> packets are accepted by the bridge!
>
> Thanks,
> martin
>
> --
> Martin LauerHochschule der Medien Nobelstraße 10 70569 Stuttgart
>
>
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>
>


-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org
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