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Thanks for the response and also for the link :-)
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<div class="">Actually we are struggling with the floating IP so each one of them matters. </div>
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<div class="">I am thinking to go for a model where I can use minimum floating IPs, can’t afford to give a new floating IP to each new tenant's routers.</div>
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<div class=""> Since its not a production environment we can compromise on performance and different tenants traffic can share same interface. </div>
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<div class="">Regards..</div>
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<div class="">Salman. </div>
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<div class="">PhD, Scientific Computing<br class="">
Researcher, IT Department,<br class="">
Uppsala University.<br class="">
Cloud Application Expert,<br class="">
UPPMAX.<br class="">
Visiting Researcher,<br class="">
Helsinki Institute of Physics (HIP).<br class="">
<a href="mailto:salman.toor@it.uu.se" class="">salman.toor@it.uu.se</a><br class="">
http://www.it.uu.se/katalog/salto690</div>
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<div class="">On 02 Sep 2015, at 00:28, James Denton <<a href="mailto:james.denton@rackspace.com" class="">james.denton@rackspace.com</a>> wrote:</div>
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<div class="">Hi Salman,</div>
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<div class="">The external bridge, br-ex, does not require an IP address. When routers are connected to the bridge, it is true they procure an address from the external provider network. The address is applied to the qg interface within the router namespace.</div>
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<div class="">When instances send traffic out, the router NATs the traffic using its respective IP (known as SNAT, or many to one.) When an instance has a floating IP, the router will NAT the traffic using the floating IP instead (known as one to one). The
SNAT behavior can be disabled on a particular router if necessary, but it introduces routing issues that need to be solved upstream.</div>
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<div class="">James<br class="">
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Sent from my iPhone</div>
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On Sep 1, 2015, at 4:33 PM, Salman Toor <<a href="mailto:salman.toor@it.uu.se" class="">salman.toor@it.uu.se</a>> wrote:<br class="">
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<div style="direction: ltr; font-family: Tahoma; font-size: 10pt;" class="">Hi,
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<div class="">Can some one please explain it a bit or redirect me to the document. </div>
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<div class="">So on neutron node we need external interface br-ex (public IP) and than each tenant's router also occupies a real IP when we attach it to external net.</div>
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<div class="">I am wondering what is the path instances traffic take to go out? I mean will it go via the public IP attached to the router or its via br-ex?</div>
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<div class="">Regards..</div>
<div class="">Salman. </div>
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