Virtual networks with overlapping address space cannot be peered. If you intend to peer these virtual networks, change address

Govinda Vaidhyam 0

Created VM for domian database server and win10 machine,

Address space '10.0.0.0/16' overlaps with address space '10.0.0.0/16' of virtual network 'sccmtest-vnet'. Virtual networks with overlapping address space cannot be peered. If you intend to peer these virtual networks, change address space '10.0.0.0/16'.

while peering it is throwing above error

KapilAnanth-MSFT 47,046 Reputation points Microsoft Employee

2024-07-10T08:14:42.3166667+00:00
@Govinda Vaidhyam ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Were you able to peer the two Virtual Networks now?

I see you have mentioned "old one 10.0.0.0/16 doesn't get deleted and still gives same error."

Can you please elaborate on what you mean?

If this is a new set up,

I would suggest you delete all the VNETs and create two new VNETs of address ranges "10.0.0.0/16" and "10.1.0.0/16" and Peer them together

However, if the issue has been now resolved, please don’t forget to click "Accept the answer" which might be beneficial to other community members reading this thread.

If not,

please share the address range of the 2 VNETs

And the error message you see

Cheers,

Kapil

1 answer

Andreas Baumgarten 111.5K Reputation points MVP

2024-07-08T13:42:47.5166667+00:00

Hi @Govinda Vaidhyam ,

it looks like you have to different Azure Virtual Networks (vNets) with the same IP address range (10.0.0.0/16)?

If so you can't peer these two vNets because of the "overlapping" IP address range. The address ranges are required to be different. For instance 10.0.0.0/16 and 10.1.0.0/16.

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

Regards

Andreas Baumgarten
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Govinda Vaidhyam 0 Reputation points

2024-07-09T07:08:47.84+00:00

Hello @Andreas Baumgarten ,

Thanks for your response, yes i understood it needs to be different but once i change it to 10.1.0.0/16. the old one 10.0.0.0/16 doesn't get deleted and still gives same error.

Andreas Baumgarten 111.5K Reputation points MVP

2024-07-09T07:56:33.0033333+00:00

Hi @Govinda Vaidhyam ,

if you have 2 vNets left, one with IP address range 10.0.0.0/16 and one with 10.1.0.0/16 there should be no overlapping of the IP address ranges.

Maybe it's possible to provide screenshots of the vNet configuration (including the subnet configuration of each vNet)?

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

Regards

Andreas Baumgarten
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Virtual networks with overlapping address space cannot be peered. If you intend to peer these virtual networks, change address

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