Open Stack

Tom Verdaat <tom at ...> writes:

> 
> 
> 
> Hi Tomas,
> Actually the networking nodes, and in a DVR scenario the compute nodes,
don't need a public IP assigned to the node itself. All they need is a
networking interface connected to the "public" network. Only tenant routers
set as a gateway consume one public IP address each as overhead. You cannot
get around each tenant gateway router consuming an extra public IP address
itself as far as I know.
> 
> Does that answer your question?
> 
> Cheers,
> 
> Tom
> 

Well, yes, kind of. That is the behavior I am seeing. But to cite the blog
post by Assaf Muller:

"IP addresses! Legacy routers configure a routable address on their external
devices. It’s not wasted by any means because it is used for SNAT traffic.
With DVR, as we noticed in the previous blog post, we do the same. [...]
Instead, it was chosen to allocate a dedicated IP address for every (node,
external network) pair."

From this, I understood that the centralized SNAT agent will be centralized
to the degree that it will have only one IP address, not that every virtual
router will have a routable address on its external device.
Tomas

> 
> 
> 2016-01-20 13:48 GMT+01:00 Tomas Vondra
<vondra-l6WB4nJzLFygjssBaH+rSA at public.gmane.org>:Hi!
> I have just deployed an OpenStack Kilo installation with DVR and expected
> that it will consume one Public IP per network node as
perhttp://assafmuller.com/2015/04/15/distributed-virtual-routing-floating-ips/,
> but it still eats one per virtual Router.
> What is the correct behavior?
> Otherwise, it works as a DVR should according to documentation. There are
> router namespaces at both compute and network nodes, snat namespaces at the
> network nodes and fip namespaces at the compute nodes. Every router has a
> router_interface_distributed and a router_centralized_snat with private IPs,
> however the router_gateway has a public IP, which I would like to getr id of
> to increase density.
> Thanks
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> 
> 
> 
> 
> 
> 
> 
> <div><div dir="ltr">
> <div>
> <div>Hi Tomas,<br><br>
> </div>Actually the networking nodes, and in a DVR scenario the compute
nodes, don't need a public IP assigned to the node itself. All they need is
a networking interface connected to the "public" network. Only tenant
routers set as a gateway consume one public IP address each as overhead. You
cannot get around each tenant gateway router consuming an extra public IP
address itself as far as I know.<br><br>
> </div>
> <div>Does that answer your question?<br><br>
> </div>
> <div>Cheers,<br><br>
> </div>
> <div>Tom<br>
> </div>
> <div><div>
> <br><div><div class="gmail_extra">
> <br><div class="gmail_quote">2016-01-20 13:48 GMT+01:00 Tomas Vondra <span
dir="ltr"><<a href="mailto:vondra at ..."
target="_blank">vondra at ...</a>></span>:<br><blockquote
class="gmail_quote">Hi!<br>
> I have just deployed an OpenStack Kilo installation with DVR and expected<br>
> that it will consume one Public IP per network node as per<br><a
href="http://assafmuller.com/2015/04/15/distributed-virtual-routing-floating-ips/"
rel="noreferrer"
target="_blank">http://assafmuller.com/2015/04/15/distributed-virtual-routing-floating-ips/</a>,<br>
> but it still eats one per virtual Router.<br>
> What is the correct behavior?<br>
> Otherwise, it works as a DVR should according to documentation. There are<br>
> router namespaces at both compute and network nodes, snat namespaces at
the<br>
> network nodes and fip namespaces at the compute nodes. Every router has a<br>
> router_interface_distributed and a router_centralized_snat with private
IPs,<br>
> however the router_gateway has a public IP, which I would like to getr id
of<br>
> to increase density.<br>
> Thanks<br><br><br>
> _______________________________________________<br>
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rel="noreferrer"
target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack</a><br>
> Post to     : <a
href="mailto:openstack at ...g">openstack at ...</a><br>
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> </blockquote>
> </div>
> <br>
> </div></div>
> </div></div>
> </div></div>
>