[CentOS-virt] Upgrade of CentOS and libvirt: need help on configuring network

Mon Sep 23 13:58:56 UTC 2013
Schut, Koos J J (Koos) <kschut at avaya.com>

I upgraded from CentOS 5.9 to CentOS 6.4.
I try to reuse my virtual machines and am only partially successful: I can run them, I just cannot get the network OK and need some help with that.

What I had in the past was pretty simple: both the host and the VM's used eth0 and each had an IP in the same subnet and could communicate freely. With the new install it seems somewhat more complex and I think I need to configure a bridge and use that. Unfortunately, info I find through google is overwhelming and confusing. All examples either configure something else, or the outcome is not what  expected.

So: how to go about setting things up to have say:
My physical machine is on
My Virtual machines are on and 101.
These are to be fixed addresses.
The 2 VM's have to communicate with each other and with the physical machine.
The VM's do not necessarily need to communicate with the rest of the world.
The physical machine needs to communicate with the rest of the world.

I use:
- CentOS-6.4_64
- Virtual Machine Manager 0.9.0
- xen 4.2.3
- libvirt
- VM's show Hypervisor = xen (fullvirt)
- Emulator = qemu-dm
- NIC points to Shared device name virbr0
- on the host, virbr0 has IQ

I have been fighting this for 2 weeks, now. I tried to follow several advises which resulted in either the VM's not connecting to anything, or my host losing its connection to the rest of the world, or both. So either I still do something not-right, or I follow the wrong gidelines.

Can someone give me a push in the right direction, please?

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