[CentOS-virt] MS-Win7 kvm guest gets dhcp from host bridge

Thu Feb 20 06:29:52 UTC 2014
Ashish Yadav <gwalashish at gmail.com>

On Thu, Feb 20, 2014 at 3:36 AM, Dusty Mabe <dustymabe at gmail.com> wrote:

> On 02/19/2014 04:01 PM, James B. Byrne wrote:
> > CentOS-6.5
> > i86_64
> > qemu-kvm-
> > MS-Windows v7proSP1
> >
> > We have installed a MicroSoft Win7 system as a guest and have joined it
> to our
> > MS AD domain. The system runs and has internet access.  However, the IPv4
> > address it obtains and the gateway it is assigned are both sourced from
> the
> > virtual machine host system and not from our AD DC DHCP server.
> >
> > To clarify, the virbr0 IP address is and the Windows guest
> has
> > that address as its gateway and an IP address in the
> > netblock.  This is not as we desire as the internal addresses we
> regularly
> > assign to MS workstations via DHCP are supposed to belong to a different
> > netblock entirely.  This permit filtering on incoming and outgoing
> traffic at
> > the gateway.
> >

1. If I understand you correctly then you want to assign MS-Windows a IP
which should not be from

2. If that is yes then you have to configure your DHCP server so that
machine which
is a guest machine should get IP based on their MAC address. In VirtualBox
MAC address is in this range
08:00:27:XX:XX:XX:XX, first three value will be constant for all guests.

> > I realize that there is a DHCP service running on virbr0 for the purpose
> of
> > provisioning guests with system control traffic but I do not know how to
> limit
> > that to its intended purpose and allow another DHCP server to provide
> the IP
> > address to the windows guests.  I hope that problem description is not
> too
> > confusing.
> >
> > Can anyone provide me with some guidance on the matter?  Are kvm guests
> > required to have either static ip addresses or dhcp addresses provided
> by the
> > host system?
> It sounds like what you need to do is create a bridge and then connect
> your virtual machine to the bridge so that it can receive DHCP from the
> external network.  I assume you are using libvirt. If so, check out the
> page below. It may help you get started in the right direction.
> http://wiki.libvirt.org/page/Networking#Bridged_networking_.28aka_.22shared_physical_device.22.29
> Dusty
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Ashishkumar S. Yadav
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