Open Stack

The NIC card in your machine would not accept packets not belonging to its
own mac address unless you set it in promiscuous mode. This is necessary in
Openstack because the host is often dealing with the packets destined for
the vms. If the interfaces are not in promiscuous they shall be dropped.


On Thu, Jun 19, 2014 at 5:59 PM, <yalla.gnan.kumar at accenture.com> wrote:

>  Hi,
>
>
>
> Thanks for the reply.
>
>
>
> What is the use of promiscuous mode in openstack ?
>
>
>
>
>
> Thanks
>
> Kumar
>
>
>
> *From:* Akilesh K [mailto:akilesh1597 at gmail.com]
> *Sent:* Thursday, June 19, 2014 5:28 PM
> *To:* Gnan Kumar, Yalla; openstack at lists.openstack.org
> *Subject:* Re: [Openstack] GRE tunnel
>
>
>
> Openstack support multi tenant networks. That means two tenants may use
> the same network space. There must be some other way to isolate the
> networks of different tenants. So every network in Openstack is assigned a
> special segmentation id. In case of gre the segmentation id is the tunnel
> id. In case of vlan mode the segmentation id becomes the vlan id.
>
> I have some more detailed information in the below posts
>
>
> http://fosskb.wordpress.com/2014/06/10/managing-openstack-internaldataexternal-network-in-one-interface/
>
> http://fosskb.wordpress.com/2014/06/19/l2-connectivity-in-openstack-using-openvswitch-mechanism-driver/
>
>
>
> On Thu, Jun 19, 2014 at 5:12 PM, <yalla.gnan.kumar at accenture.com> wrote:
>
> Hi All,
>
>
>
> What is the requirement of GRE tunneling in openstack ?  Why the VMs have
> to communicate only through GRE tunnels ?
>
>
>
>
>
> Thanks
>
> Kumar
>
>
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