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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal">We are a team attempting a PoC on Openstack with a single node deployment to start with.<o:p></o:p></p>
<p class="MsoNormal">It currently has Keystone, Glance and Nova enabled.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As a part of this PoC, we learnt that Openstack with Nova-network in FlatDHCP mode,<o:p></o:p></p>
<p class="MsoNormal">uses two subnets on the Host machine:<o:p></o:p></p>
<p class="MsoNormal">- Public Subnet for floating IPs : <o:p></o:p></p>
<p class="MsoNormal">o Openstack manages the mapping of floating to fixed IPs for VMs.<o:p></o:p></p>
<p class="MsoNormal">o VMs are not aware of the additional public IP assigned.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">- Private Subnet for Fixed IPs:<o:p></o:p></p>
<p class="MsoNormal">o Openstack boots up the VM with this IP address and VM is aware of it<o:p></o:p></p>
<p class="MsoNormal">o BR100 created to manage the VMnet fabric for traffic on this subnet.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Few Queries:<o:p></o:p></p>
<p class="MsoNormal">----------------<o:p></o:p></p>
<p class="MsoNormal">-For applications on such a setup that use IP-sensitive protocols like SIP, how do we handle the scenarios?<o:p></o:p></p>
<p class="MsoNormal">Are we expected to have SIP ALG to do additional SIP based NAT’ng apart from what nova-network manages?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Does this NAT’ng of Floating to Fixed IP not really pull down the performance overall?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-What if I need my VMs to be spawned on a public subnet for general accessibility
<o:p></o:p></p>
<p class="MsoNormal">“without any NAT’ng” involved? Is there anyways Openstack can help?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Rekha<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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