Remote Access Services

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Remote Access Services

After getting huge response on my last post “How to filter data using Rest from Azure Storage“. I decided to write something about RAS (Remote Access Service). But before starting the topic , I would like to admonish my readers that if you have not worked on Microsoft Network then you may find this post little abstruse. Anyway let’s start. RAS is common term for all Microsoft Vendor Companies like HCL, Wipro, Infosys, MAQ etc.

Introduction: RAS is known as Remote Access Services . RAS is used to access other domains through internet and by using Smart Card.Smart cards are given by the Microsoft to their partners companies. Basically Smart Cards gives login credentials to access Microsoft Domain.Smart Cards are used to login by a user one at a time i.e. if one user is using one smart card the other user cannot use that smart card credentials for login.So we can say Smart Cards will let only one user to login from one system only.

RAS working for single user : Can you imagine how many processes are done during connectivity with other domain? Let’s take a simple view on it.Refer to below figure for better understanding:

Remote Access Services

Below are details on Figure :
• Domain is simply our working Domain where we are connected with RAS through Smart Card.
• Gateway retrieve information from ICS (Internet Connection Sharing) to verify that Information is coming through each smart card.i.e. multiple computer cannot use the single Smart Card. (But Nothing is Impossible! ?)
• After Gateway phase, it checks for authentication of Smart Card.
• If authentication is passed then it automatically update the system and antivirus (E-Trust) to access Microsoft Domain.
• After that it checks the limitation for that user through Smart Card information.
• According to their limitation privileges Microsoft allows access to their domain.

So this is the simple connectivity of RAS through Smart card into the Microsoft domain access. But it is not the end of this post because one question which comes in my mind is that “How we can use single Smart card for multiple computer although Microsoft allows only single computer can access their domain through single Smart Card ?”
So I worked on that and finally found a technique.
Now ready for high dive of information because it is not only good, it is AWESOME !!
How to connect RAS for multiple computer: Before we start, I believe that we should have little knowledge about Virtualization (Virtual Server) and networking concept.
Let’s start with basic figures and then understand each component of technique.

Remote Access Services

Although Figures can creates chaos in your mind but let’s start it step by step
• As from the figure we need two NIC ( Network Interface Card) in physical machine. NIC card is only responsible for connection to internet because your computer unique MAC Address is used for ARP and RARP that are used for resolution of request data address. We will not be getting into much details about it as it is out of scope for this post and requires separate post for it.
• Second step is to create a virtual machine on a server. We require virtual machine in server because there is single ICS (Internet Connection Sharing) manager per computer and when RAS is used for accessing domain of Microsoft then Microsoft internally check with ICS manager and see the connectivity with LAN. If there is LAN Connectivity then it does not connect with Microsoft Domain because it does not support connection with LAN.
• Third step is that when you install VM (Virtual Machine) then it automatically create the alias of physical machine and create two Virtual NIC in VM, that will help in creating VPN (Virtual Private Network) as it is cleared from figure (b).
• Fourth step is that now we can share NIC 1 of VM with the NIC 1 of physical machine and NIC 2 of VM with the NIC 2 of physical machine . Basic concept is when we create alias of NIC 2 through VM and all are shared with each NIC as shown in figure i.e. now we have two ICS (one for VM).When Microsoft check LAN connectivity with physical ICS it gives simple connection with shared NIC and NIC 2 connect as shown to virtual NIC2 and now we can share LAN through ICS manager of VM.
• The whole management is called virtual private network (VPN).
• So using shared LAN we can connect multiple computer with only single Smart Card.

Conclusion: So at the end of this post , I hope you would have understood the basic concept of RAS. However this concept is very useful for demystifying virtulization.
Any Doubt on this article, Please mail me at asthanarht@usefulfreetips.com

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