[openstack-dev] [neutron] multiple external networks on the same host NIC

Mike Spreitzer mspreitz at us.ibm.com
Sat Apr 25 20:05:23 UTC 2015

As an operator, is there a way I can create two 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 

I asked this on openstack-operators, and got one response saying my 
choices are either to use VLAN tagging on that NIC or manually make more 
OVS switches that ultimately get their external connectivity through the 
same NIC.  The VLAN tagging is problematic in my environment.  Is there 
any other choice?

BTW, I am currently using Juno but plan to move to Kilo.

BTW, is Neutron creating any ebtables rules that will get in my way?

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