I have 3 Vnet's (1,2&3). VM in configured in all 3 Vnet's. Vnet 1 & 3 is peered , Vnet 1 & 3 is peered. I wanted to establish communication between vnet 2 & 3 without peering . how to achieve it. allow network access and forward traffic is enabled in all vnet. NIC card are enabled with IP forward traffic UDR is associated with Vnet 2 & 3 Subnet with route information of VNET 2 & 3 address space.

Hello @Karthick G , Transitive peering is not supported in Azure which means if you peer VNet1 to VNet2 and you peer VNet1 to VNet3, VNet2 and VNet3 are NOT automatically peered. You must peer VNet2 and VNet3 to establish communication between VNet 2 & 3. Please refer : https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#if-i-peer-vneta-to-vnetb-and-i-peer-vnetb-to-vnetc-does-that-mean-vneta-and-vnetc-are-peered You can find the connectivity options available for Azure resources in below article: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-overview#communicate-between-azure-resources Hope this helps! Kindly let us know if the above helps or you need further assistance on this issue. ---------------------------------------------------------------------------------------------------------------- Please " Accept the answer " if the information helped you. This will help us and others in the community as well.

Vnet Peering with spoke

Karthick G 101

I have 3 Vnet's (1,2&3). VM in configured in all 3 Vnet's. Vnet 1 & 3 is peered , Vnet 1 & 3 is peered. I wanted to establish communication between vnet 2 & 3 without peering . how to achieve it.

allow network access and forward traffic is enabled in all vnet.
NIC card are enabled with IP forward traffic
UDR is associated with Vnet 2 & 3 Subnet with route information of VNET 2 & 3 address space.

GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-09-30T07:39:33.913+00:00

Hello @Karthick G ,

You have mentioned : Vnet 1 & 3 is peered , Vnet 2 & 3 is peered and you want to establish communication between Vnet 2 & 3 without peering. Does that mean you want to remove the existing peering between Vnet 2 & 3 and are looking for another way to connect them?

Could you please provide some more details on your requirement?

Thanks,
Gita
Karthick G 101 Reputation points

2020-09-30T08:01:19.283+00:00

Hello @GitaraniSharma-MSFT it was a mistake, Vnet 1 & 3 is peered and Vnet 1 & 2 is peered. Now i want to establish connection between Vnet 2 & Vnet 3 without peering . Eg : I have a VM in Vnet2 , It should be reachable from a VM in Vnet3
GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-10-05T07:39:12.79+00:00

Hello @Karthick G ,

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Thanks,
Gita
GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-10-06T05:30:13.29+00:00

Hello @Karthick G ,

Could you please provide an update on this post?

Kindly let us know if the below answer helps or you need further assistance on this issue.

----------------------------------------------------------------------------------------------------------------

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.

1 answer

GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-09-30T08:26:10.043+00:00

Hello @Karthick G ,

Transitive peering is not supported in Azure which means if you peer VNet1 to VNet2 and you peer VNet1 to VNet3, VNet2 and VNet3 are NOT automatically peered. You must peer VNet2 and VNet3 to establish communication between VNet 2 & 3.
Please refer : https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#if-i-peer-vneta-to-vnetb-and-i-peer-vnetb-to-vnetc-does-that-mean-vneta-and-vnetc-are-peered

You can find the connectivity options available for Azure resources in below article:
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-overview#communicate-between-azure-resources

Hope this helps!

Kindly let us know if the above helps or you need further assistance on this issue.

----------------------------------------------------------------------------------------------------------------

Please "Accept the answer" if the information helped you. This will help us and others in the community as well.
Please sign in to rate this answer.

1 person found this answer helpful.
Karthick G 101 Reputation points

2020-09-30T09:42:41.33+00:00

@GitaraniSharma-MSFT if apply hub & spoke concept. Vnet 1 is acting has HUB and Vnet 2 & 3 are spokes. how to configure Vnet 1 to route the traffic between vnet 2 & vnet 3.

https://learn.microsoft.com/en-us/azure/architecture/reference-architectures/hybrid-networking/hub-spoke#spoke-connectivity

Above document says it is possible by using azure firewall . I couldn't get the document which explains the configuration in firewall to achieve this. Could you help me with that ?

GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-09-30T10:13:03.483+00:00

Hello @Karthick G ,

Do you have an existing Azure Firewall in your Hub Vnet? I am asking this because I would like to understand your end goal. Azure Firewall will be a bit on the heavier side if you compare it's pricing with Vnet peering. So, if your end goal is just establishing connection between the Vnets, then the best approach is to utilise Vnet peering. If your end goal is traffic filtering, then you can go for hub-spoke model with Azure Firewall.

For pricing, please refer : https://azure.microsoft.com/en-in/pricing/details/virtual-network/
https://azure.microsoft.com/en-us/pricing/details/azure-firewall/

For Hub-spoke model with Azure Firewall, you can refer the below blog where it has the similar deployment: https://kvaes.wordpress.com/2018/08/28/trying-out-the-azure-firewall-in-a-hub-spoke-deployment-model/

In case you have further queries, do let me know.

Thanks,
Gita

Karthick G 101 Reputation points

2020-09-30T10:49:26.777+00:00

@GitaraniSharma-MSFT . I am currently trying out different option available I got the overall idea. Thanks for your time and for sharing the blog really appreciate it.

GitaraniSharma-MSFT 49,586 Reputation points Microsoft Employee

2020-09-30T11:04:54.463+00:00

Thank you for the update @Karthick G .

Do let us if you need further assistance on this issue.

And please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
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