Adding gateway to existing vnet

Gregory Wood 1 Reputation point
2021-04-24T21:44:37.713+00:00

Simple set up. The network is 10.0.0.0/24. The default is the same. I want to add appgateway. There are no open ports. I connected into 'subnets' and tried to change it from 10.0.0.0/24 to 10.0.0.0/26. It said "in use and cannot be edited" How do I get around this?

Azure VPN Gateway
Azure VPN Gateway
An Azure service that enables the connection of on-premises networks to Azure through site-to-site virtual private networks.
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  1. Andreas Baumgarten 66,051 Reputation points Microsoft MVP
    2021-04-24T22:21:42.133+00:00

    Hi @Gregory Wood ,

    as long as there are Connected devices in a subnet in an Azure Virtual Network you can't modify the subnet. No chance.

    If I understand your scenario right:
    You Azure Virtual Network: address space: 10.0.0.0/24
    The subnet of the Virtual Network address space: 10.0.0.0/24

    You want to add an additional subnet (for deployment of an Azure VPN Gateway)?

    If so, you need to extend the Virtual Network, for instance to 10.0.0.0/16. This is possible if there are connected devices with the existing subnet which will not be modified.
    If you extended the Virtual Network's address space to 10.0.0.0/16 you should be able to add an additional subnet, for instance with address space 10.0.1.0/24, to the Virtual Network without any problem.

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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

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  2. Greg Wood 1 Reputation point
    2021-05-01T23:35:06.967+00:00

    I found that yes, I could not change the subnet settings. I went back and expanded the base settings from /24 to /22. Then I was able to create a second subnet.
    Thank you for your time.