<div dir="ltr">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.<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jun 19, 2014 at 5:59 PM, <span dir="ltr"><<a href="mailto:yalla.gnan.kumar@accenture.com" target="_blank">yalla.gnan.kumar@accenture.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks for the reply.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">What is the use of promiscuous mode in openstack ?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Kumar<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Akilesh K [mailto:<a href="mailto:akilesh1597@gmail.com" target="_blank">akilesh1597@gmail.com</a>]
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<b>Sent:</b> Thursday, June 19, 2014 5:28 PM<br>
<b>To:</b> Gnan Kumar, Yalla; <a href="mailto:openstack@lists.openstack.org" target="_blank">openstack@lists.openstack.org</a><br>
<b>Subject:</b> Re: [Openstack] GRE tunnel<u></u><u></u></span></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">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.
<u></u><u></u></p>
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<p class="MsoNormal">I have some more detailed information in the below posts<br>
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<a href="http://fosskb.wordpress.com/2014/06/10/managing-openstack-internaldataexternal-network-in-one-interface/" target="_blank">http://fosskb.wordpress.com/2014/06/10/managing-openstack-internaldataexternal-network-in-one-interface/</a><br>
<a href="http://fosskb.wordpress.com/2014/06/19/l2-connectivity-in-openstack-using-openvswitch-mechanism-driver/" target="_blank">http://fosskb.wordpress.com/2014/06/19/l2-connectivity-in-openstack-using-openvswitch-mechanism-driver/</a><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Jun 19, 2014 at 5:12 PM, <<a href="mailto:yalla.gnan.kumar@accenture.com" target="_blank">yalla.gnan.kumar@accenture.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi All,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">What is the requirement of GRE tunneling in openstack ? Why the VMs have to communicate only through GRE tunnels ?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks<u></u><u></u></p>
<p class="MsoNormal">Kumar<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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