Windows Server 2012: Hyper-V Network Virtualization

Hyper-V Network Virtualization allow customers to keep their own internal IP addresses when moving to the cloud while providing isolation from other customers’ VMs – even if those VMs happen to use the exact same IP addresses.

The way it works is that each VM receive two IP addresses :

The first one, the IP address visible in the VM, is relevant in the context of a given tenant’s virtual subnet. Following the IEEE nomenclature we call this the Customer Address (CA).

The other IP address is relevant in the context of the physical network in the cloud datacenter. This is called the Provider Address (PA).  This decoupling of tenant and datacenter IP addresses provides many benefits.
One of the benefits is that you can move your VMs to the cloud without modifying the VM’s network configuration and without worrying about what else (or who else) is sitting in that datacentre.

Another big reason is the policy enforcement in the end hosts that provides a scalable solution for multi-tenant isolation, instead of using Vlan’s, for isolation.

There are 2 different mechanisms to virtualize the IP address:

Generic Routing Encapsulation (GRE) : should be used for network virtualization, because it provides the most flexibility and performance. It will be used for most environments/deployments

IP Rewrite : may be appropriate to provide performance and compatibility in some current high-capacity datacenters.


A very good article was posted by Jeffrey about this topic


About Alessandro Cardoso
Virtualization and Management passionate. Infrastructure products and solutions knowledge with management and hands on experience; Project Leader, with deep knowledge and expertise in a variety of Microsoft Infrastructure technologies in areas such as Virtualization and Management with product skill sets ranging from, Hyper-V, System Center, Windows Server, SQL Server, Active Directory, Exchange, SharePoint, IIS and Forefront; Plus knowledge in Quest Migration Manager, Linux Infrastructure, Networking, Security Solutions (such as VPN, Firewall) and VMware in complex and large scenarios; Strong knowledge of industry-related datacenter processes, strategies, industry regulations and requirements. Selected as Microsoft Brazil IT Hero, in 2007 and Microsoft IT Heroes Happen in Los Angeles, in 2008. selected as Bussiness Case, further virtualization project for a Governmental Institution. I am also a well known speaker in IT events (e.g. Microsoft TechEd 2007, 2008, 2010 and 2011). MVP since 2009, in Virtual Machine. I have experience developing, planning, organizing, and leading complex initiatives as well business case development skills, acquired in 23 years of experience in IT, working in segments spanning from Government, Health, Education and IT. Well-known speaker in IT events like TechEd, Sage-AU, CNASI. Proven Multitasking skills, presentation skills and analytical skills and problem determination ability; Belief in providing the highest quality of service; Good listener and communicator; Know how to prioritize the work and perform under pressure. Continuously seeking innovative ways to improve productivity and a resourceful problem-solver with focus on customers. Microsoft Most Valuable Professional : Virtual Machine Certifications : Australia Computer Society Certified Professional, MCITP: Enterprise, MCSE: Security, MCSA, MCT, MCTS:SQL, MCTS:SharePoint, MCTS:Vista, Linux Conectiva Professional, Modulo Certified Security Officer Blogs :

2 Responses to Windows Server 2012: Hyper-V Network Virtualization

  1. Pingback: Windows Server 2012: Hyper-V Network Virtualization … « Data Protection & Availability

  2. Pingback: Full of I.T.

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