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Can you put them to different vlans? After that it would be very easy task.

If not, AFAIK, neutron does not allow this.

Or you can trick it thinking it is (are) separate networks.

Create brige (br-join), plug eth to it.
Create to fake external bridges (br-ex1, br-ex2). Join them together to 
br-join by patch links 
(http://blog.scottlowe.org/2012/11/27/connecting-ovs-bridges-with-patch-ports/)

Instruct neutron like there is two external networks: one on br-ex1, 
second on br-ex2.

But be alert that this not very stable configuration, you need to 
maintain it by yourself.

On 04/25/2015 10:13 PM, Mike Spreitzer wrote:
> Is there a way to create multiple external networks from Neutron's 
> point of view, where both of those networks are accessed through the 
> same host NIC?  Obviously those networks would be using different 
> subnets.  I need this sort of thing because the two subnets are 
> treated differently by the stuff outside of OpenStack, so I need a way 
> that a tenant can get a floating IP of the sort he wants.  Since 
> Neutron equates floating IP allocation pools with external networks, I 
> need two external networks.
>
> I found, for example, http://www.marcoberube.com/archives/248--- which 
> describes how to have multiple external networks but uses a distinct 
> host network interface for each one.
>
> Thanks,
> Mike
>
>
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators

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