[Openstack] A confuse about the FlatDHCP network

Lei Zhang zhang.lei.fly at gmail.com
Thu Dec 6 03:19:10 UTC 2012

thank you very much, Vishvananda.
But I am still confused about the and the ip.
What means by "The addresses will be moved on to the bridge". It means the will be disappear?  In my opinion, the bridged NIC (eth1)
should be worked under promiscuous mode and its IP should be So
the eth1 should not own any IP.
But if the 192 address doesn't exist,  how the compute-note communicate
with each other? Through the eth0? I have no idea.

On Thu, Dec 6, 2012 at 3:12 AM, Vishvananda Ishaya <vishvananda at gmail.com>wrote:

> On Dec 5, 2012, at 1:53 AM, Lei Zhang <zhang.lei.fly at gmail.com> wrote:
> Hi all,
> I am reading the
> http://docs.openstack.org/trunk/openstack-compute/admin/content/libvirt-flat-dhcp-networking.html,
> I got the following deploy architecture. But there are several that I am
> confused.
>    - How and why ip range exist? It is necessary or not?
>    The eth1 on the each physical machine own two ip( and
> Is that possible? In the nova-compute, the eth1
>    should be bridged by br100. the eth1 should not own any IP address, right?
> The addresses will be moved on to the bridge. The point of having an ip
> address is so that things like rabbit and mysql can communicate over a
> different set of addresses than the guest network. Usually this would be
> done on a separate eth device (eth2) or vlan, but I was trying to keep
>    - In a better way, should we separate the nova-network/eth0 to the
>    internet public switch for access the internet by all VMs. and the
>    nova-compute/eth0 should be bind to a internal switch for admin access use.
>    Is it right?
> Ideally there are three eth devices / vlans a) public (for 99 adddresses
> in diagram) b) management (for 192 addresses in diagram) c) guest (for 10
> addresses in diagram)
> --
> Lei Zhang
> Blog: http://jeffrey4l.github.com
> twitter/weibo: @jeffrey4l
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Lei Zhang

Blog: http://jeffrey4l.github.com
twitter/weibo: @jeffrey4l
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