[openstack-dev] [Nova][Neutron] Has Neutron satisfied parity with Nova network FlatDHCP?

Salvatore Orlando sorlando at nicira.com
Fri Apr 17 18:26:49 UTC 2015

DVR probably still does satisfy the same requirements as nova multi-host,
because of the lack of SNAT masquerade distribution.
Neutron DVR distributes the floating IP and east-west traffic, but the
default gateway for each VM is still centralised, thus making the network
node a SPOF.

Then from a data plane perspective the other aspect is that for DVR we
assume OVS while nova-network deployers would probably stick with Linux
Bridge. However this is a bit off topic here.

I am not aware of other differences, at least feature-wise. From a
usability perspective the infrastructure for achieving functionality
equivalent to FlatDHCP can be set up by an admin (or provided by neutron
itself using some configuration switch), and the users could be completely
oblivious to that - ie: they can boot a VM and connect a floating IP to it
without ever using the "neutron" utility or calling the Neutron API.


On 17 April 2015 at 20:11, Kevin Benton <blak111 at gmail.com> wrote:

> If the Neutron topology is configured to use a router connected to an
> external network and a shared network, will that achieve the same semantics
> as Nova with a FlatDHCP network?
> One of the last remaining items that I was aware of was ARP poisoning
> protection. At the end of Kilo, we added protection from that in OVS-based
> deployments.[1]
> Are there any other remaining major differences that we can fix on the
> Neutron side to make it a good replacement?
> 1.
> https://github.com/openstack/neutron/commit/483de6313fab5913f9e68eb24afe65c36bd9b623
> --
> Kevin Benton
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