openstack team mailing list archive

[Salvatore Orlando <sorlando@xxxxxxxxxx>]

Hi Janis,

If your provider network maps directly to a publicly accessible network
then you should be able to assign IPs to VMs from a public range without
using Floating IPs and NAT.
With Quantum, you just specify a physical network (e.g.: eth0) and a
segmentation id (e.g.: vlan id 999) for creating this mapping; ensuring it
actually results in VM instances directly connected to a public network is
beyond the scope of Quantum.

Regards,
Salvatore


On 5 October 2012 22:07, Jānis Ģeņģeris <janis.gengeris@xxxxxxxxx> wrote:

> Hello,
>
> I have asked similar question about floating IPs before, but the Quantum
> docs are now updated with section about provider networks.
>
> Can this(multiple IP from same public net) be done if using provider
> networks? As I understand from the docs then they map directly to VMs
> without fixed ip + nat in the middle. And the user would see real IP
> asigned to interface inside VM?
>
> On Fri, Oct 5, 2012 at 8:23 PM, Dan Wendlandt <dan@xxxxxxxxxx> wrote:
>
>> On Fri, Oct 5, 2012 at 4:32 AM, Heinonen, Johanna (NSN - FI/Espoo)
>> <johanna.heinonen@xxxxxxx> wrote:
>> > Hi,
>> >
>> > I was reading Quantum admin guide (folsom release). There was use case
>> > “per-tenant routers with private networks”. In this example all
>> floating IPs
>> > were from the same subnet (30.0.0.0/22).
>> >
>> > I was wondering whether it is possible to have several floating IP
>> subnets
>> > and could one VM have floating IP from all of those? (If I have an
>> > application that must be reachable from internet via two different
>> > interfaces with two different IP addresses, can I do it with Quantum?)
>>
>> Not right now.  With Quantum, a router can only uplink to a single
>> external network, and you can have at most one floating IP per
>> external network (otherwise we could not unambiguously apply the
>> policy of SNAT-ing VM initiated connections to the floating IP).  In
>> Grizzly, we're planning on making router uplinks more sophisticated,
>> which will include not only the ability to uplink to multiple networks
>> with floating IPs, but also uplink to other types of connectivity,
>> such as an external VPN.
>>
>> I'll update the admin guide to make this clear.
>>
>> Dan
>>
>>
>>
>> >
>> > Best regards,
>> >
>> > Johanna
>> >
>> >
>> > _______________________________________________
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>>
>>
>>
>> --
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Dan Wendlandt
>> Nicira, Inc: www.nicira.com
>> twitter: danwendlandt
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> _______________________________________________
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>
>
>
> --
> --janis
>
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