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Microsoft Azure: Configure Cross-Subscription VNET to VNET Connectivity in Azure…

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Hi Everyone,

Recently, we announced lot of enhancements in Microsoft Azure. One of them being the cross-VNET connectivity between same subscription or different subscriptions. You can read more about it here https://msdn.microsoft.com/en-us/library/azure/dn690122.aspx

I am going to cover a sample test configuration that I have done in my subscription for your reference. Feel free to refer this along with the MSDN documentation.

So, let’s begin.

What you need?

Microsoft Azure Subscription x 2 (You can also refer the link above to perform the VNET to VNET configuration using a single subscription)
Windows Azure PowerShell Module

Let’s Begin – Here is my setup

I have 2 Azure Subscriptions…

Subscription Name

Selected Region for Affinity Group

Storage Account

AVIRAJ-CORP

East US 2 (NYC)

nyc

AVIDEMO-INTERNAL

East Asia (JPN)

jpn

NETWORK TOPOLOGY

This is how it will look like

Virtual Network

Virtual Network Site Definition

Local Network Site Definition

 DNS

VNet1 (NYC)

VNet1 (10.10.0.0/16)

VNet2 (192.168.0.0/16)

 10.10.1.4

VNet2 (JPN)

VNet2 (192.168.0.0/16)

VNet1 (10.10.0.0/16)

 10.10.1.4

Now, let’s start with steps.

Step 1: Create Affinity Groups in these 2 subscriptions.

AVIRAJ-CORP – Affinity Group: NYC
AVIDEMO-INTERNAL – Affinity Group: JPN

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Step 2: Create Storage Accounts in these 2 subscriptions

AVIRAJ-CORP – Storage Account: nyc
AVIDEMO-INTERNAL – Storage Account: jpn

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Step 3: Create DNS Server in both the subscriptions.

Creating DNS Server in subscription AVIRAJ-CORP in NYC as CROSS-VNET – 10.10.1.4   (This will be the first virtual machine created in VNET1 and it will be assigned 10.10.1.4 within IP Range 10.10.1.X, we will configure DC & DNS on that VM)
Creating DNS Server in subscription AVIDEMO-INTERNAL in JPN as CROSS-VNET – 10.10.1.4   (As we want our VNET2 VMs to talk to VNET1 VMs, we have to manually create DNS entry that will point to VNET1 VM with DNS)

NOTE: In the VNET to VNET Connectivity in the Same subscription, you do not need to create 2 DNS entries.

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Step 4: Create VNET1 in AVIRAJ-CORP Subscription with Affinity Group NYC

Go to NEW –> NETWORK SERVICES –> VIRTUAL NETWORK –> CUSTOM CREATE

Enter Virtual Network Name: VNET1, select affinity group NYC. Click Next

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Select DNS from drop down menu CROSS-VNET (10.10.1.4) and check mark on Configure a site-to-site VPN and click Next

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On the next screen we are adding a LOCAL NETWORK VNET2 configuration for Virtual Network VNET1. VNET2 IP Configuration will act as a LOCAL NETWORK IP CONFIGURATION is this scenario. Refer the table in the beginning. Once configured click Next.

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On this last screen, we will configure IP Address range for VIRTUAL NETWORK (VNET1) as per the table.

Add the Address Space as per table 10.10.0.0 and CIDR /16 (65536)

Create a new SUBNET called AD with IP Range 10.10.1.0 and CIDR /24 (256)

Click on add gateway subnet. Once done click on Check box to complete the wizard.

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And it will look like this when it’s created

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When you click on Configure tab, you will see the complete configuration that we just created

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That’s done.

Step 5: Create VNET2 in AVIDEMO-INTERNAL Subscription with Affinity Group JPN

Repeat the steps like Step 4 and complete the VNET2 creation in the JPN affinity group in the AVIDEMO-INTERNAL subscription.

Enter Virtual Network Name: VNET2, select affinity group JPN. Click Next

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Select DNS from drop down menu CROSS-VNET (10.10.1.4) and check mark on Configure a site-to-site VPN and click Next

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On the next screen we are adding a LOCAL NETWORK VNET1 configuration for Virtual Network VNET2. VNET1 IP Configuration will act as a LOCAL NETWORK IP CONFIGURATION is this scenario. Refer the table in the beginning. Once configured click Next.

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On this last screen, we will configure IP Address range for VIRTUAL NETWORK (VNET2) as per the table.

Add the Address Space as per table 192.168.0.0 and CIDR /16 (65536)

Create a new SUBNET called AD with IP Range 192.168.1.0 and CIDR /24 (256)

Click on add gateway subnet. Once done click on Check box to complete the wizard.

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And it will look like this when it’s created.

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When you click on Configure tab, you will see the complete configuration that we just created.

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That’s done.

Step 6: Create Dynamic Routing VPN Gateways for VNET1 & VNET2. Note: Static Routing Gateways are not supported. Refer MSDN Link.

Go to Networks –> VNET1 –> Dashboard. Click on CREATE GATWAY –> Dynamic Routing. And click on Yes.

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Once you click Yes, you will the dashboard status like this…

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That’s done. We will wait for the gateway to be created.

 

Similarly, let’s create a gateway for VNET2. Go to Networks –> VNET2 –> Dashboard. Click on CREATE GATWAY –> Dynamic Routing. And click on Yes. Once you click Yes, you will the dashboard status like this…

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NOTE: It will take somewhere between 15-20 mins. before you see the Gateway IP in the Dashboard.

 

Once completed, you will see gateway ip address for VNET.

Here is VNET1

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Here is VNET2

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That’s done.

Step 7: Replace the temporary placement IP Address in the Local Networks VNET1 & VNET2 VPN Device IP Address with the actual Gateway IP address that we just obtained.

Go to Networks –> VNET1 –> Dashboard. Copy the Gateway IP Address 137.116.XX.XX.

Go to Network –> LOCAL NETWORKS. Click on VNET1 with IP Address 1.0.0.0. Click on Edit

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Replace the VPN Device IP Address 1.0.0.0 with the VNET1 Gateway IP Address 137.116.XX.XX.   On the next page do not change anything click Next and Finish.

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Done.

 

Now, similarly we will do this for other network

Go to Networks –> VNET2 –> Dashboard. Copy the Gateway IP Address 207.46.XX.XX.

Go to Network –> LOCAL NETWORKS. Click on VNET2 with IP Address 2.0.0.0. Click on Edit

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Replace the VPN Device IP Address 2.0.0.0 with the VNET2 Gateway IP Address 207.46.XX.XX.   On the next page do not change anything click Next and Finish.

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Done.

 

Once both the LOCAL NETWORKS VPN DEVICE IP ADDRESSES updated, it will look like this.

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Step 8: Set the IPsec/IKE pre-shared keys for both the subscriptions.

For this configuration, we will use PowerShell. I am assuming that you understand how to configuration Microsoft Azure Subscriptions using PowerShell. Refer this blog for basics.

In order to configured shared keys I will run the following PowerShell cmdlets

Set-AzureVNetGatewayKey -VNetName VNet1 -LocalNetworkSiteName VNet2 -SharedKey A1B2C3D4
Set-AzureVNetGatewayKey -VNetName VNet2 -LocalNetworkSiteName VNet1 -SharedKey A1B2C3D4

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As soon as you set the shared keys for both the subscriptions’ VNETs, you will see in few moments that the VNET to VNET Connection gets established.,

Step 9: Verifying connectivity between Cross-Subscription VNET to VNET.

Go to Networks –> VNET1 –> Dashboard. Observe the connection established.

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Similarly, go to Networks –> VNET2 –> Dashboard. Observe the connectivity.

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Enjoy

Step 10: Create 2 Virtual Machines in each Subscription connected to respective VNETs and see how they communicate.

First create a Windows Server 2012 R2 VM in Subscription (AVIRAJ-CORP) using VNET1.

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Next, select the appropriate subscription AVIRAJ-CORP and choose VNET1. And select storage account nyc.

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Continue and create VM.

 

Similarly, create a Windows Server 2012 R2 VM in Subscription (AVIDEMO-INTERNAL) using VNET2.

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Next, select the appropriate subscription AVIDEMO-INTERNAL and choose VNET2. And select storage account jpn.

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Continue and create VM.

NOTE: It will take about 10 mins. to create 2 VMs.

Once VMs are ready you will see their status like this.

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Let’s check the configuration from the dashboard for WS2012R2-NYC in AVIRAJ-CORP Subscription

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Similarly, check the configuration from the dashboard for WS2012R2-JPN in AVIDEMO-INTERNAL Subscription

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That’s ready.

Once the VMs are fully provisioned, you can check the VMs within the Virtual Network dashboard page.

VNET1

Go to Networks –> VNET1 –> Dashboard.

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VNET2

Go to Networks –> VNET1 –> Dashboard.

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Finally, let’s RDP into the VMs and see their IP Configuration and connectivity between VMs between different VNETs within Cross-Subscription

As soon as you RDP into the VMs. Make sure to open wf.msc and enable Inbound Rules. File and Printer Sharing (Echo Request – ICMPv4-In & ICMPv6-In) This will enable Ping command.

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Now, let’s see the IP Configuration of WS2012R2-NYC in AVIRAJ-CORP Subscription. As you can see, IP Address is picked up from the 10.10.1.X IP Range and DNS is picked up as defined i.e. 10.10.1.4

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Now, let’s see the IP Configuration of WS2012R2-JPN in AVIDEMO-INTERNAL Subscription

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FINAL TEST. Ping each other.

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At this stage, I will configure Domain Controller on WS2012R2-NYC machine and it will serve as a DNS for my VMs connected to VNET1 & VNET2.

And friends, that’s Cross-Subscription VNET to VNET connectivity within Microsoft Azure. This is one of many coolest features that we announced during Microsoft TechEd North America 2014. For more details visit https://channel9.msdn.com to explore more around Microsoft Azure Networking.

Hope you enjoy this post and have a great day.

Thanks You & Happy Networking Smile

Comments

  • Anonymous
    May 20, 2014
    Thank you for your post!! Very useful but i have a question... Is possible to configure between existing Virtual Networks or it has to be new?

  • Anonymous
    May 28, 2014
    The comment has been removed
  • Anonymous
    June 03, 2014
    Thanks. It will work with existing VNETs as well.
  • Anonymous
    November 09, 2014
    Thanks Aviraj! Just done.
    I love Azure:).
  • Anonymous
    July 01, 2015
    I build a script to automate the process. :)
    checkout https://tombwu.wordpress.com/2015/07/02/build-complex-cross-azure-subscription-windows-lab-by-using-azure-site-to-site-vpn/

  • Anonymous
    July 27, 2015
    I tired this out to try to connect multiple virtual networks together, though what I cannot figure out is how once you create a 3rd network to connect it to your VNet1. Thoughts?