Same IP address range for two VNets in the same region

Question

Same IP address range for two VNets in the same region

Neeraj 11

Hi,

Is Microsoft determined to make impossible possible? I created a VNet within a Resource Group with a specific IP address range, which is not being recognized, and another VNet automatically got created with same IP address range while creating a VM. How???

Regards,
Neeraj

Answer 1

Nadav Ben Haim 496 Microsoft Employee

Hello @Neeraj ,

same address space for 2 Vnets that are not peered shouldn't be an issue,
unless you have plans to peer these 2 virtual networks.

It'll be great if you can elaborate more on what is the issue and what are you trying to achieve.

Neeraj 11 Reputation points

2022-08-30T17:31:46.737+00:00

Hi @Nadav Ben Haim

In that case, how will the resources get identified? Also, one VNet was already created with an address space of 10.0.0.0/16 and when I tried to create a VM within that VNet, the option to choose the same VNet was not appearing. It rather created another VNet with the same address space. You mean to suggest that it is normal?

Regards,
Neeraj
Andreas Baumgarten 67,616 Reputation points MVP

2022-08-30T18:06:48.44+00:00

Hi @Neeraj ,

you created the new VM in the same Azure Subscription in the same Azure region?
If so you should be able to select the existing Virtual Network and subnet in the "Create a virtual machine" wizard.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
Neeraj 11 Reputation points

2022-08-30T18:26:44.99+00:00

Hi @Andreas Baumgarten ,

Exactly. That is the expected behavior as you have mentioned, but this did not happen. The resources are not just in the same subscription, but also in the same Resource Group and region. I am experiencing this since last couple of weeks for other resources as well.

Regards,
Neeraj
Andreas Baumgarten 67,616 Reputation points MVP

2022-08-30T18:54:36.06+00:00

Hi @Neeraj ,

are you deploying the VMs using Availability Zones?
It should not matter and should not cause any issues because virtual networks are spanning all Availability Zones in a region by default.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
Neeraj 11 Reputation points

2022-08-30T19:02:25.187+00:00

Hi @Andreas Baumgarten ,

No, I am not deploying the VM using Availability Zone.

Regards,
Neeraj

Same IP address range for two VNets in the same region

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