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From Geoff Higginbottom <>
Subject Re: CS 3.0.2 and XCP 1.5 Beta Multihomed Instances
Date Sun, 24 Jun 2012 08:37:26 GMT
I think what you are trying to achieve is possible, assuming the main goal is to have a NIC
on each VM with direct access to a public Internet connection without any NAT etc.

You mention that there is no smart VLAN switch on the network, but that could be your first
stumbling block.

If I wanted to give every VM a Public NIC I would use advanced Networking (Requires a V!AN
Switch), use one Physical NIC for 'Management', 'Guest' and 'Public' and assign the second
physical NIC as another 'Guest' Network.

You then need to create a custom 'Network Offering' to create a 'shared Network' with the
parameters required for your 'Public' No-NAT Network.

As you have two 'Guest' networks, you will need to assign each a unique 'Tag'.  Because of
the Tags the default Network Services Offerings will no loger function so you will need to
modify these or create new ones,

Most of this will have to be done using the API not the GUI

Kind Regards

Geoff Higginbottom
CTO / Cloud Architect |

ShapeBlue Ltd, 53 Chandos Place, Covent Garden, London, WC2N 4HS

On 23 Jun 2012, at 18:18, "Outback Dingo" <> wrote:

simple setup one would think, yet accomplishing it in cloudstack had
proven not feasible / capable of being done

we have 1 CS management server, and 5 XCP hosts

every thing has 2 nics eth0 / eth1

eth0 is on the 192.X network

eth1 is on the public with 71.XXX

each XCP host has labeled  interfaces eth0 labeled private with
192.XXX adresses, eth1 labeled public with no IP addresses

in cloudstack i wish to dual home all instances on both the 71.XXX
public interface, and the 192.XXX private interface (its got storage)

so when we create a instances, we can choose to "add" a secondary
guest network on the 192.XXX interface attached to the "private" host
there is no "smart" vlan capable switch in the environment, its a
pretty flat network.

I can do it with XCP without an issue, but when i add CS into the
configuration, CS doesnt appear to allow this type of configuration

and we dont to NAT... we want the public ips on the instances, not
port forwarded to it

question is...... HOW.....

ShapeBlue provides a range of strategic and technical consulting and implementation services
to help IT Service Providers and Enterprises to build a true IaaS compute cloud. ShapeBlue’s
expertise, combined with CloudStack technology, allows IT Service Providers and Enterprises
to deliver true, utility based, IaaS to the customer or end-user.


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