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Design question - Azure IaaS networking for branch offices

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Hi,

I am still trying to understand Windows Azure IaaS, I have used Amazon EC2 and currently my company is considering Windows Azure IaaS, and they want to move their on premise servers to Azure IaaS if possible, except Lync OnPrem (because of Enterprise Voice), they want to move all other "Server Master Roles" to Windows Azure and keep replica servers On Premise.

We have several offices around the world and each of these offices must connect to the Virtual Cloud Infrastructure we are considering in Azure IaaS. Branch offices connecting to HQ for services is not an option. In their current setup Riverbed WAN accelerators are utilised between branch offices and On Premise datacenter. Riverbed Steelhead is also considered to be moved to Cloud IaaS (currently supported in Amazon EC2).

From the information I found in blogs and forums, it looks like Azure Virtual Network do not provide Site to Multisite VPN, and that private IP addresses assigned to VMs in Azure cannot be modified (limited DHCP options).

In order for me to ensure that Windows Azure IaaS meets our requirement, please guide me on following scenario.

Illustration of the setup

I think the way we will deploy Riverbed in Azure might be very different from what is shown in the above diagram. However, rest of the design will probably remain same. My questions are as follows:

(1) What we should consider for (X?), I am interested in a solution officially supported by Windows Azure. (X?) must support VPN to Cisco ASA / ISR.

(2) IP addresses assigned to the VMs in Azure cannot be manually modified, now if I have a DFS Namespace server in Azure IaaS, and if for some reason I have to rebuild the server - and it receives a different IP address, does it mean that I will have to re-establish the whole DFS setup (for all sites) due to change in IP addresse?

(3) Due to the way IP addresses are assigned by Azure Virtual Network, it looks like we cannot setup an Active Directory GC Server + DNS in Azure, please confirm if this is correct, or please refer me to some documentation.

Thanks in advance.

Best regards,

Marco


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